@charset "UTF-8";

:root {
  --ink: #eef4ff;
  --ink-soft: #c1cce0;
  --muted: #7e8ba3;
  --night: #060b14;
  --night-blue: #07101f;
  --panel: #0b1424;
  --panel-light: #101c2f;
  --line: rgba(164, 186, 224, 0.14);
  --line-strong: rgba(164, 186, 224, 0.24);
  --blue: #3e8bff;
  --blue-bright: #74b8ff;
  --cyan: #3ee7d7;
  --gold: #d9b96e;
  --purple: #9277ff;
  --max: 1280px;
  /* 固定 header 未滚动时的高度，用于给内页正文让出顶部空间 */
  --header-height: 78px;
  --radius: 22px;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 94px;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: var(--night);
  color: var(--ink);
  font-family: "SF Pro Display", "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--blue-bright);
  outline-offset: 4px;
}

svg {
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 15px;
  transform: translateY(-150%);
  border-radius: 8px;
  background: #fff;
  color: #06101d;
  font-weight: 700;
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 999;
  height: 2px;
  background: transparent;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  box-shadow: 0 0 16px rgba(62, 139, 255, 0.7);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 200;
  height: 78px;
  border-bottom: 1px solid transparent;
  background: linear-gradient(180deg, rgba(6, 11, 20, 0.86), rgba(6, 11, 20, 0));
  transition: height 240ms ease, border-color 240ms ease, background 240ms ease, backdrop-filter 240ms ease;
}

.site-header.is-scrolled {
  height: 68px;
  border-color: var(--line);
  background: rgba(6, 11, 20, 0.84);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.14);
  backdrop-filter: blur(20px) saturate(140%);
}

.header-inner {
  display: flex;
  width: min(calc(100% - 56px), var(--max));
  height: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  width: 39px;
  height: 39px;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(116, 184, 255, 0.34);
  border-radius: 11px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.13), rgba(255, 255, 255, 0.03));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 10px 28px rgba(18, 91, 204, 0.18);
}

.brand-mark img {
  width: 30px;
  height: 30px;
  object-fit: contain;
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  font-size: 17px;
  font-weight: 750;
  letter-spacing: 0.12em;
}

.brand-copy small {
  color: #718097;
  font-size: 8px;
  font-weight: 750;
  letter-spacing: 0.2em;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  margin-left: auto;
}

.desktop-nav a {
  position: relative;
  padding: 8px 0;
  color: #aab6ca;
  font-size: 13px;
  font-weight: 600;
  transition: color 180ms ease;
}

.desktop-nav a::after {
  position: absolute;
  inset: auto 50% 0;
  width: 0;
  height: 1px;
  background: var(--blue-bright);
  content: "";
  transition: width 180ms ease, left 180ms ease;
}

.desktop-nav a:hover {
  color: #fff;
}

.desktop-nav a:hover::after {
  left: 0;
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-right: 2px;
  color: #435169;
  font-size: 9px;
  font-weight: 750;
  letter-spacing: .04em;
}

.language-switcher a {
  padding: 7px 3px;
  color: #68778f;
  transition: color 160ms ease;
}

.language-switcher a:hover,
.language-switcher a.is-active {
  color: #c3d8f2;
}

.mobile-language-switcher {
  display: none;
}

.header-search-button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.035);
  color: #8592a8;
  cursor: pointer;
}

.header-search-button:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.06);
  color: #c8d3e5;
}

.header-search-button svg {
  width: 15px;
}

.header-search-button span {
  font-size: 12px;
}

.header-search-button kbd {
  padding: 2px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  color: #6f7b8f;
  font-size: 9px;
  font-family: inherit;
}

.header-cta {
  display: inline-grid;
  min-height: 39px;
  place-items: center;
  padding: 0 17px;
  border: 1px solid rgba(89, 158, 255, 0.54);
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(51, 128, 237, 0.28), rgba(37, 100, 192, 0.14));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 12px 30px rgba(27, 92, 188, 0.12);
  color: #eaf3ff;
  font-size: 12px;
  font-weight: 700;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.header-cta:hover {
  transform: translateY(-1px);
  border-color: rgba(116, 184, 255, 0.84);
  background: linear-gradient(135deg, rgba(51, 128, 237, 0.4), rgba(37, 100, 192, 0.22));
}

.menu-toggle,
.mobile-nav {
  display: none;
}

.hero {
  position: relative;
  display: grid;
  min-height: 860px;
  overflow: hidden;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 72% 42%, rgba(26, 93, 201, 0.13), transparent 28%),
    linear-gradient(135deg, #060b14 0%, #07101e 55%, #071120 100%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.42;
  background-image:
    linear-gradient(rgba(111, 148, 204, 0.065) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 148, 204, 0.065) 1px, transparent 1px);
  background-position: center;
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, transparent, #000 16%, #000 78%, transparent);
}

.hero-grid::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, #060b14 3%, transparent 28%, transparent 72%, #07101e 97%);
  content: "";
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.hero-glow-one {
  top: 14%;
  right: 5%;
  width: 430px;
  height: 430px;
  background: rgba(41, 107, 215, 0.12);
}

.hero-glow-two {
  bottom: -18%;
  left: 10%;
  width: 360px;
  height: 360px;
  background: rgba(42, 209, 212, 0.065);
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  width: min(calc(100% - 56px), var(--max));
  grid-template-columns: minmax(0, 1.02fr) minmax(440px, 0.98fr);
  align-items: center;
  gap: 70px;
  margin: 0 auto;
  padding: 138px 0 112px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 24px;
  color: var(--blue-bright);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.26em;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 11px;
}

.eyebrow span {
  width: 27px;
  height: 1px;
  background: var(--blue-bright);
  box-shadow: 0 0 8px var(--blue);
}

.hero h1 {
  margin: 0;
  color: #f3f7ff;
  font-size: clamp(64px, 6.4vw, 96px);
  font-weight: 660;
  letter-spacing: -0.075em;
  line-height: 1.03;
}

.hero h1 em {
  position: relative;
  background: linear-gradient(100deg, #8bc3ff 5%, #4e93ff 48%, #56ded9 100%);
  background-clip: text;
  color: transparent;
  font-style: normal;
  text-shadow: 0 0 46px rgba(47, 128, 245, 0.12);
}

.hero h1 em::after {
  position: absolute;
  right: 2px;
  bottom: 6px;
  width: 16px;
  height: 16px;
  border-top: 1px solid var(--cyan);
  border-right: 1px solid var(--cyan);
  content: "";
  opacity: 0.62;
}

.hero-lead {
  margin: 28px 0 0;
  color: #9aa8bd;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.95;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 40px;
}

.primary-button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 0 23px;
  border: 1px solid rgba(127, 190, 255, 0.7);
  border-radius: 12px;
  background: linear-gradient(135deg, #347fef, #215ebe);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 16px 40px rgba(32, 98, 202, 0.25);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, filter 180ms ease;
}

.primary-button:hover {
  transform: translateY(-2px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 20px 50px rgba(32, 98, 202, 0.38);
  filter: brightness(1.08);
}

.primary-button svg {
  width: 19px;
}

.text-button {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: #c7d2e3;
  font-size: 13px;
  font-weight: 650;
}

.play-dot {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.035);
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.text-button:hover .play-dot {
  transform: scale(1.06);
  border-color: rgba(116, 184, 255, 0.55);
  background: rgba(62, 139, 255, 0.12);
}

.play-dot svg {
  width: 18px;
  fill: currentColor;
  stroke-width: 0;
}

.hero-metrics {
  display: flex;
  gap: 0;
  margin: 54px 0 0;
}

.hero-metrics div {
  min-width: 138px;
  padding: 0 28px;
  border-left: 1px solid var(--line);
}

.hero-metrics div:first-child {
  padding-left: 0;
  border-left: 0;
}

.hero-metrics dt {
  color: #eaf3ff;
  font-size: 25px;
  font-weight: 560;
  letter-spacing: -0.04em;
}

.hero-metrics sup {
  color: var(--blue-bright);
  font-size: 12px;
}

.hero-metrics dd {
  margin: 5px 0 0;
  color: #65738a;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.hero-orbit {
  position: relative;
  min-height: 580px;
}

.orbit-shell {
  position: absolute;
  top: 49%;
  left: 50%;
  width: min(510px, 42vw);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
}

.orbit-shell::before {
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 136, 255, 0.14), transparent 61%);
  box-shadow: 0 0 100px rgba(40, 112, 218, 0.1);
  content: "";
}

.orbit-ring {
  position: absolute;
  border: 1px solid rgba(109, 160, 236, 0.22);
  border-radius: 50%;
}

.orbit-ring::before,
.orbit-ring::after {
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue-bright);
  box-shadow: 0 0 13px var(--blue);
  content: "";
}

.orbit-ring-outer {
  inset: 2%;
  border-style: dashed;
  animation: orbit-spin 54s linear infinite;
}

.orbit-ring-outer::before { top: 17%; left: 12%; }
.orbit-ring-outer::after { right: 3%; bottom: 31%; }

.orbit-ring-middle {
  inset: 15%;
  border-color: rgba(76, 143, 241, 0.28);
  animation: orbit-spin-reverse 40s linear infinite;
}

.orbit-ring-middle::before { top: 4%; right: 25%; }
.orbit-ring-middle::after { bottom: 4%; left: 25%; }

.orbit-ring-inner {
  inset: 30%;
  border-color: rgba(88, 218, 214, 0.24);
  border-style: dashed;
  animation: orbit-spin 28s linear infinite;
}

.orbit-ring-inner::before { top: 38%; left: -3px; background: var(--cyan); }
.orbit-ring-inner::after { top: 38%; right: -3px; background: var(--cyan); }

.orbit-axis {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid rgba(111, 157, 226, 0.12);
  border-radius: 50%;
}

.orbit-axis-x {
  width: 100%;
  height: 24%;
  transform: translate(-50%, -50%) rotate(-18deg);
}

.orbit-axis-y {
  width: 24%;
  height: 100%;
  transform: translate(-50%, -50%) rotate(23deg);
}

.orbit-core {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  width: 134px;
  height: 134px;
  place-items: center;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(116, 184, 255, 0.4);
  border-radius: 50%;
  background: radial-gradient(circle at 40% 32%, rgba(74, 150, 255, 0.23), rgba(8, 18, 34, 0.94) 70%);
  box-shadow: inset 0 0 28px rgba(54, 128, 239, 0.17), 0 0 60px rgba(31, 103, 218, 0.17);
}

.orbit-core::before,
.orbit-core::after {
  position: absolute;
  border: 1px solid rgba(116, 184, 255, 0.14);
  border-radius: 50%;
  content: "";
}

.orbit-core::before { inset: 8px; }
.orbit-core::after { inset: -10px; border-style: dashed; }

.orbit-core img {
  width: 48px;
  height: 48px;
  transform: translateY(-8px);
}

.orbit-core span {
  position: absolute;
  bottom: 21px;
  color: #8eacd3;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0.18em;
  line-height: 1.3;
  text-align: center;
}

.orbit-node {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 7px;
  color: #91a7c7;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.orbit-node i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue-bright);
  box-shadow: 0 0 10px var(--blue);
}

.node-network { top: 13%; left: 7%; }
.node-cloud { top: 24%; right: 5%; }
.node-ai { right: 12%; bottom: 16%; }
.node-ops { bottom: 11%; left: 12%; }
.node-ai i, .node-ops i { background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }

.orbit-beacon {
  position: absolute;
  width: 7px;
  height: 7px;
  border: 1px solid var(--blue-bright);
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(62, 139, 255, 0.8);
}

.beacon-one { top: 32%; left: 28%; animation: beacon-pulse 2.8s ease-in-out infinite; }
.beacon-two { right: 28%; bottom: 31%; animation: beacon-pulse 2.8s 0.8s ease-in-out infinite; }
.beacon-three { top: 18%; right: 30%; animation: beacon-pulse 2.8s 1.5s ease-in-out infinite; }

.signal-card {
  position: absolute;
  z-index: 3;
  display: grid;
  min-width: 184px;
  gap: 5px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(10, 20, 37, 0.76);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.signal-card::before {
  position: absolute;
  top: -1px;
  left: 18px;
  width: 42px;
  height: 1px;
  background: var(--blue-bright);
  box-shadow: 0 0 10px var(--blue);
  content: "";
}

.signal-card small {
  color: #61718b;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.signal-card strong {
  font-size: 13px;
  font-weight: 650;
}

.signal-card span {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 3px;
  color: #7990b0;
  font-size: 9px;
}

.signal-card span i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}

.signal-card-top { top: 16%; right: -2%; }
.signal-card-bottom { bottom: 14%; left: -2%; }

.scroll-cue {
  position: absolute;
  bottom: 34px;
  left: 50%;
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateX(-50%);
  color: #536178;
}

.scroll-cue span {
  position: relative;
  width: 1px;
  height: 28px;
  overflow: hidden;
  background: rgba(132, 154, 189, 0.2);
}

.scroll-cue span::after {
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 70%;
  background: var(--blue-bright);
  content: "";
  animation: scroll-line 2s ease-in-out infinite;
}

.scroll-cue small {
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0.24em;
}

.search-dock {
  position: relative;
  z-index: 20;
  width: min(calc(100% - 56px), 1060px);
  margin: -38px auto 0;
}

.search-shell {
  display: grid;
  min-height: 76px;
  grid-template-columns: 25px minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  border: 1px solid rgba(132, 172, 231, 0.25);
  border-radius: 18px;
  background: rgba(11, 21, 38, 0.94);
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.36), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(22px);
}

.search-shell:focus-within {
  border-color: rgba(116, 184, 255, 0.57);
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.36), 0 0 0 4px rgba(62, 139, 255, 0.08);
}

.search-shell > svg {
  width: 23px;
  color: var(--blue-bright);
}

.search-shell input {
  width: 100%;
  height: 74px;
  border: 0;
  outline: 0;
  background: transparent;
  color: #eef5ff;
  font-size: 16px;
}

.search-shell input::placeholder {
  color: #6f7f98;
}

.search-shortcut {
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.035);
  color: #65748b;
  font-size: 10px;
  font-weight: 700;
}

.search-shell button {
  padding: 7px 10px;
  border: 0;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.05);
  color: #a9b7cb;
  cursor: pointer;
  font-size: 11px;
}

.search-suggestions {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 10px 0;
  color: #617088;
  font-size: 10px;
}

.search-suggestions > span {
  margin-right: 4px;
  letter-spacing: 0.06em;
}

.search-suggestions button {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: transparent;
  color: #8090a8;
  cursor: pointer;
  font-size: 10px;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.search-suggestions button:hover {
  border-color: rgba(116, 184, 255, 0.4);
  background: rgba(62, 139, 255, 0.07);
  color: #b9d7fb;
}

.search-suggestions p {
  margin: 0 0 0 auto;
  color: #72829b;
}

.section {
  width: min(calc(100% - 56px), var(--max));
  margin: 0 auto;
}

.course-systems {
  padding: 120px 0 132px;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(300px, 0.7fr);
  align-items: end;
  gap: 100px;
  margin-bottom: 54px;
}

.section-heading h2,
.catalog-header h2,
.media-heading h2 {
  margin: 0;
  color: #f1f5fc;
  font-size: clamp(39px, 4.3vw, 60px);
  font-weight: 620;
  letter-spacing: -0.055em;
  line-height: 1.18;
}

.section-heading > p {
  margin: 0 0 8px;
  color: #8290a6;
  font-size: 14px;
  line-height: 2;
}

.system-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 17px;
}

.system-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(17, 29, 49, 0.92), rgba(8, 15, 27, 0.96));
  box-shadow: 0 20px 55px rgba(0, 0, 0, 0.16);
  transition: transform 280ms cubic-bezier(0.2, 0.75, 0.25, 1), border-color 280ms ease, box-shadow 280ms ease;
}

.system-card:hover {
  transform: translateY(-7px);
  border-color: rgba(116, 184, 255, 0.34);
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.34);
}

.system-art {
  position: relative;
  display: block;
  height: 310px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  color: inherit;
}

.system-art-link { cursor: pointer; }
.system-art-link:focus-visible { z-index: 2; outline: 3px solid rgba(72, 144, 242, .5); outline-offset: -4px; }
.system-art-action {
  position: absolute;
  bottom: 18px;
  left: 20px;
  z-index: 5;
  display: flex;
  min-height: 36px;
  align-items: center;
  gap: 18px;
  padding: 0 13px;
  border: 1px solid rgba(151, 201, 255, .28);
  border-radius: 9px;
  color: #d9ecff;
  background: rgba(8, 25, 49, .72);
  font-size: 10px;
  font-weight: 750;
  box-shadow: 0 8px 24px rgba(8, 26, 52, .18);
  opacity: .88;
  transform: translateY(3px);
  transition: transform 180ms ease, opacity 180ms ease, background 180ms ease;
  backdrop-filter: blur(9px);
}
.system-art-action svg { width: 15px; }
.system-art-link:hover .system-art-action,
.system-art-link:focus-visible .system-art-action { opacity: 1; transform: translateY(0); background: rgba(15, 54, 103, .88); }
.vip-card .system-art-action { border-color: rgba(232, 201, 127, .34); color: #f5dfa7; background: rgba(48, 37, 15, .76); }
.vip-card .system-art-link:hover .system-art-action { background: rgba(87, 62, 17, .9); }
.aiops-card .system-art-action { border-color: rgba(100, 232, 223, .32); color: #c5fff9; background: rgba(5, 52, 52, .76); }
.aiops-card .system-art-link:hover .system-art-action { background: rgba(4, 83, 80, .9); }

.system-art::after {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.035);
  border-radius: var(--radius) var(--radius) 0 0;
  content: "";
  pointer-events: none;
}

.art-index {
  position: absolute;
  top: 22px;
  left: 23px;
  z-index: 3;
  color: rgba(220, 233, 251, 0.55);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.art-caption {
  position: absolute;
  right: 22px;
  bottom: 20px;
  z-index: 3;
  color: rgba(224, 236, 255, 0.43);
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0.19em;
  line-height: 1.6;
  text-align: right;
}

.evolution-art {
  background:
    linear-gradient(145deg, rgba(52, 122, 229, 0.18), transparent 53%),
    repeating-linear-gradient(0deg, transparent 0 35px, rgba(136, 173, 230, 0.055) 36px),
    #0a1424;
}

.prestige-emblem {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  width: 214px;
  height: 214px;
  transform: translate(-50%, -50%);
  isolation: isolate;
  transition: transform 500ms cubic-bezier(.2, .75, .25, 1), filter 500ms ease;
}

.system-card:hover .prestige-emblem {
  transform: translate(-50%, -52%) scale(1.035);
}

.emblem-aura {
  position: absolute;
  z-index: -1;
  inset: 18%;
  border-radius: 50%;
  opacity: .42;
  filter: blur(34px);
}

.emblem-geometry {
  width: 100%;
  height: 100%;
  overflow: visible;
  filter: drop-shadow(0 18px 23px rgba(0, 0, 0, .48));
}

.emblem-metal-ring {
  fill: none;
  stroke-width: 1.6;
  vector-effect: non-scaling-stroke;
}

.emblem-insignia {
  position: absolute;
  top: 71px;
  right: 31px;
  left: 31px;
  z-index: 3;
  text-align: center;
  text-shadow: 0 2px 14px rgba(0, 0, 0, .8);
}

.emblem-insignia small {
  display: block;
  font-size: 5px;
  font-weight: 800;
  letter-spacing: .22em;
  white-space: nowrap;
}

.emblem-insignia strong {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 7px 0 5px;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 31px;
  font-weight: 430;
  letter-spacing: -.06em;
  line-height: 1;
}

.emblem-insignia b {
  display: block;
  font-size: 6px;
  font-weight: 850;
  letter-spacing: .24em;
}

.emblem-seal {
  position: absolute;
  right: 19px;
  bottom: 23px;
  z-index: 4;
  display: grid;
  width: 27px;
  height: 27px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  background: rgba(5, 12, 23, .9);
  font-family: Georgia, serif;
  font-size: 10px;
  box-shadow: 0 5px 12px rgba(0, 0, 0, .38), inset 0 0 9px currentColor;
}

.evolution-emblem .emblem-aura { background: #287eef; }
.evolution-emblem .emblem-face { fill: url(#evolution-face); stroke: none; }
.evolution-emblem .emblem-fine-ring { fill: none; stroke: rgba(178, 217, 255, .26); stroke-width: .7; }
.evolution-emblem .emblem-dash-ring { fill: none; stroke: rgba(122, 184, 255, .36); stroke-width: .75; stroke-dasharray: 2 7; }
.evolution-emblem .evolution-ticks { fill: none; stroke: rgba(167, 210, 255, .54); stroke-width: 1.1; }
.evolution-emblem .evolution-orbit { fill: none; stroke: rgba(113, 180, 255, .38); stroke-width: 1; stroke-dasharray: 3 5; }
.evolution-emblem .evolution-route { fill: none; stroke: url(#evolution-metal); stroke-width: 2.4; }
.evolution-emblem .route-node { fill: #abd7ff; stroke: #2366bd; stroke-width: 1.5; }
.evolution-emblem .route-arrow { fill: none; stroke: #b9ddff; stroke-width: 2; }
.evolution-emblem .emblem-axis { fill: none; stroke: rgba(102, 168, 247, .1); stroke-width: .65; }
.evolution-emblem .emblem-insignia { top: 79px; }
.evolution-emblem .emblem-insignia small { color: #83b9f8; font-size: 4.5px; }
.evolution-emblem .emblem-insignia strong { color: #e1f1ff; }
.evolution-emblem .evolution-wordmark span { letter-spacing: .08em; }
.evolution-emblem .evolution-wordmark i {
  align-self: flex-start;
  margin: -5px 0 0 3px;
  color: #78baff;
  font-family: inherit;
  font-size: 15px;
  font-style: normal;
  font-weight: 400;
  text-shadow: 0 0 9px rgba(67, 145, 245, .75);
}
.evolution-emblem .emblem-insignia b { color: #7cb5f6; }
.evolution-emblem .emblem-seal { color: #78b6ff; }

.evolution-lines i {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 255px;
  height: 1px;
  transform-origin: 0 0;
  background: linear-gradient(90deg, rgba(85, 153, 247, 0.32), transparent);
}

.evolution-lines i:nth-child(1) { transform: rotate(12deg); }
.evolution-lines i:nth-child(2) { transform: rotate(58deg); }
.evolution-lines i:nth-child(3) { transform: rotate(130deg); }
.evolution-lines i:nth-child(4) { transform: rotate(198deg); }
.evolution-lines i:nth-child(5) { transform: rotate(284deg); }

.vip-art {
  background:
    radial-gradient(circle at 63% 43%, rgba(197, 166, 97, 0.18), transparent 32%),
    linear-gradient(145deg, rgba(126, 91, 46, 0.16), transparent 52%),
    #12130f;
}

.vip-emblem .emblem-aura { background: #c38f32; }
.vip-emblem .vip-shield-face { fill: url(#vip-face); stroke: none; }
.vip-emblem .vip-inner-shield { fill: none; stroke: rgba(237, 205, 128, .3); stroke-width: .8; }
.vip-emblem .vip-crown { fill: rgba(219, 181, 89, .12); stroke: url(#vip-metal); stroke-width: 1.5; }
.vip-emblem .vip-gem { fill: #f0d381; stroke: #79561d; stroke-width: 1; }
.vip-emblem .vip-laurel,
.vip-emblem .vip-laurel-leaves { fill: none; stroke: rgba(224, 191, 111, .46); stroke-width: 1.2; }
.vip-emblem .vip-divider { fill: none; stroke: rgba(235, 204, 131, .26); stroke-width: .8; }
.vip-emblem .emblem-insignia { top: 108px; right: 40px; left: 40px; }
.vip-emblem .emblem-insignia small { color: #9d8348; font-size: 4.6px; }
.vip-emblem .emblem-insignia strong { margin: 5px 0 4px; color: #f2d98f; font-family: Georgia, "Times New Roman", serif; font-size: 39px; font-weight: 500; letter-spacing: .08em; }
.vip-emblem .emblem-insignia b { color: #ad8f50; font-size: 5px; letter-spacing: .18em; }
.vip-emblem .emblem-seal { right: 21px; bottom: 21px; color: #d5ae56; background: rgba(21, 18, 10, .93); }

.vip-scan {
  position: absolute;
  top: 32%;
  left: -5%;
  width: 110%;
  height: 1px;
  transform: rotate(-8deg);
  background: linear-gradient(90deg, transparent, rgba(232, 199, 118, 0.55), transparent);
  box-shadow: 0 0 20px rgba(232, 199, 118, 0.3);
}

.aiops-art {
  background:
    radial-gradient(circle at 51% 51%, rgba(47, 222, 211, 0.15), transparent 27%),
    linear-gradient(145deg, rgba(28, 154, 158, 0.12), transparent 52%),
    #071716;
}

.aiops-mesh i {
  position: absolute;
  width: 7px;
  height: 7px;
  border: 1px solid rgba(89, 234, 225, 0.58);
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(62, 231, 215, 0.24);
}

.aiops-mesh i::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 120px;
  height: 1px;
  transform-origin: left;
  background: linear-gradient(90deg, rgba(73, 222, 214, 0.26), transparent);
  content: "";
}

.aiops-mesh i:nth-child(1) { top: 26%; left: 19%; }
.aiops-mesh i:nth-child(2) { top: 18%; right: 21%; }
.aiops-mesh i:nth-child(3) { top: 52%; left: 10%; }
.aiops-mesh i:nth-child(4) { right: 10%; bottom: 32%; }
.aiops-mesh i:nth-child(5) { bottom: 18%; left: 26%; }
.aiops-mesh i:nth-child(6) { right: 30%; bottom: 13%; }
.aiops-mesh i:nth-child(7) { top: 16%; left: 45%; }
.aiops-mesh i:nth-child(1)::after { transform: rotate(23deg); }
.aiops-mesh i:nth-child(2)::after { transform: rotate(147deg); }
.aiops-mesh i:nth-child(3)::after { transform: rotate(-20deg); }
.aiops-mesh i:nth-child(4)::after { transform: rotate(198deg); }
.aiops-mesh i:nth-child(5)::after { transform: rotate(-47deg); }
.aiops-mesh i:nth-child(6)::after { transform: rotate(232deg); }
.aiops-mesh i:nth-child(7)::after { transform: rotate(93deg); }

.aiops-emblem .emblem-aura { background: #16bcb4; }
.aiops-emblem .aiops-octagon-face { fill: url(#aiops-face); stroke: none; }
.aiops-emblem .aiops-inner { fill: none; stroke: rgba(103, 236, 226, .26); stroke-width: .8; stroke-dasharray: 3 3; }
.aiops-emblem .aiops-ring { fill: rgba(4, 25, 26, .55); stroke: rgba(97, 231, 222, .26); stroke-width: .9; }
.aiops-emblem .aiops-circuits { fill: none; stroke: rgba(102, 235, 226, .5); stroke-width: 1; }
.aiops-emblem .aiops-circuits circle { fill: #93fff5; stroke: #0b706d; stroke-width: 1.2; }
.aiops-emblem .aiops-pulse { fill: none; stroke: url(#aiops-metal); stroke-width: 1.9; }
.aiops-emblem .emblem-insignia { top: 76px; right: 27px; left: 27px; }
.aiops-emblem .emblem-insignia small { color: #57bdb7; }
.aiops-emblem .emblem-insignia strong { margin: 9px 0 7px; color: #c6fff9; font-size: 31px; letter-spacing: -.08em; }
.aiops-emblem .emblem-insignia strong span { margin: 0 3px; color: #45cfc6; font-size: 16px; font-weight: 300; }
.aiops-emblem .emblem-insignia b { color: #54c7c0; font-size: 5.3px; }
.aiops-emblem .emblem-seal { right: 17px; bottom: 17px; color: #42c9c1; background: rgba(5, 25, 25, .93); }

.system-content {
  padding: 28px 27px 30px;
}

.system-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #73839b;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue-bright);
  box-shadow: 0 0 10px var(--blue);
}

.status-dot.is-gold { background: var(--gold); box-shadow: 0 0 10px rgba(217, 185, 110, 0.7); }
.status-dot.is-cyan { background: var(--cyan); box-shadow: 0 0 10px rgba(62, 231, 215, 0.7); }

.system-content h3 {
  margin: 14px 0 12px;
  font-size: 27px;
  font-weight: 620;
  letter-spacing: -0.035em;
}

.system-content > p {
  min-height: 132px;
  margin: 0;
  color: #8391a6;
  font-size: 13px;
  line-height: 1.9;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 22px;
}

.tag-row span {
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.025);
  color: #75859d;
  font-size: 9px;
  font-weight: 650;
}

.system-content > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 26px;
  min-height: 48px;
  padding: 0 15px;
  border: 1px solid rgba(105, 168, 248, .24);
  border-radius: 10px;
  color: #d9eaff;
  background: rgba(45, 117, 217, .11);
  font-size: 12px;
  font-weight: 700;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.system-content > a svg {
  width: 18px;
  transition: transform 180ms ease;
}

.system-content > a:hover svg {
  transform: translateX(4px);
}

.system-content > a:hover { border-color: rgba(105, 168, 248, .46); background: rgba(45, 117, 217, .18); transform: translateY(-1px); }
.vip-card .system-content > a { border-color: rgba(202, 159, 65, .25); color: #f1d895; background: rgba(181, 132, 31, .1); }
.vip-card .system-content > a:hover { border-color: rgba(202, 159, 65, .46); background: rgba(181, 132, 31, .17); }
.aiops-card .system-content > a { border-color: rgba(32, 188, 180, .25); color: #aaf7f0; background: rgba(20, 166, 160, .1); }
.aiops-card .system-content > a:hover { border-color: rgba(32, 188, 180, .46); background: rgba(20, 166, 160, .17); }

/* 思维导图外链：作为次级入口，弱化为描边按钮，避免和“进入课程”主 CTA 抢视觉 */
.mindmap-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 42px;
  padding: 0 14px;
  border: 1px dashed rgba(120, 150, 190, .38);
  border-radius: 10px;
  color: #93a9c6;
  background: transparent;
  font-size: 11px;
  font-weight: 700;
  transition: border-color 180ms ease, color 180ms ease, background 180ms ease;
}

.mindmap-link svg { width: 16px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.mindmap-link b { font-size: 12px; font-weight: 700; }
.mindmap-link:hover { border-color: rgba(120, 150, 190, .7); color: #d9eaff; background: rgba(105, 168, 248, .1); }

.system-content > a.mindmap-link { justify-content: flex-start; margin-top: 10px; }
.vip-card .system-content > a.mindmap-link { border-color: rgba(202, 159, 65, .3); color: #cbab6c; background: transparent; }
.vip-card .system-content > a.mindmap-link:hover { border-color: rgba(202, 159, 65, .58); color: #f1d895; background: rgba(181, 132, 31, .1); }
.aiops-card .system-content > a.mindmap-link { border-color: rgba(32, 188, 180, .3); color: #7fd3cc; background: transparent; }
.aiops-card .system-content > a.mindmap-link:hover { border-color: rgba(32, 188, 180, .58); color: #aaf7f0; background: rgba(20, 166, 160, .1); }

.global-empty-state {
  margin-top: 30px;
  padding: 62px 30px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  text-align: center;
}

.global-empty-state span { color: var(--blue-bright); font-size: 9px; font-weight: 800; letter-spacing: .2em; }
.global-empty-state h3 { margin: 12px 0 8px; font-size: 25px; }
.global-empty-state p { margin: 0; color: var(--muted); font-size: 13px; }

.public-course-empty {
  grid-column: 1 / -1;
  display: grid;
  place-content: center;
  width: 100%;
  min-height: 240px;
  margin-top: 0;
}

.evolution-section {
  padding: 120px 0 140px;
  border-top: 1px solid var(--line);
}

.catalog-header {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) auto;
  align-items: start;
  gap: 26px;
  margin-bottom: 54px;
}

.catalog-number {
  color: rgba(124, 148, 186, 0.18);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 60px;
  font-weight: 300;
  line-height: 1;
}

.catalog-header .section-kicker {
  margin-bottom: 13px;
}

.catalog-header h2 {
  font-size: clamp(42px, 4.2vw, 58px);
}

.catalog-header > div:nth-child(2) > p:last-child {
  max-width: 680px;
  margin: 16px 0 0;
  color: #7d8ca2;
  font-size: 14px;
  line-height: 1.9;
}

.catalog-badge {
  display: grid;
  min-width: 126px;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid rgba(92, 158, 255, 0.26);
  border-radius: 12px;
  background: rgba(62, 139, 255, 0.055);
  text-align: right;
}

.catalog-badge span {
  color: #8dc4ff;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.16em;
}

.catalog-badge small {
  color: #65758e;
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.catalog-badge.is-cyan {
  border-color: rgba(62, 231, 215, 0.25);
  background: rgba(62, 231, 215, 0.05);
}

.catalog-badge.is-cyan span { color: #86eee6; }

.filter-panel {
  display: grid;
  gap: 14px;
  margin-bottom: 30px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.018);
}

.filter-panel.is-single-row,
.vip-type-filter {
  margin-top: 13px;
}

.catalog-search {
  display: grid;
  min-height: 58px;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  border: 1px solid rgba(92, 158, 255, .24);
  border-radius: 13px;
  background: rgba(62, 139, 255, .045);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.catalog-search:focus-within {
  border-color: rgba(116, 184, 255, .55);
  box-shadow: 0 0 0 4px rgba(62, 139, 255, .07);
}

.catalog-search > svg {
  width: 19px;
  color: #77b5ff;
}

.catalog-search input {
  width: 100%;
  height: 56px;
  border: 0;
  outline: 0;
  background: transparent;
  color: #e9f2ff;
  font-size: 13px;
}

.catalog-search input::placeholder {
  color: #66768e;
}

.catalog-search > span {
  color: #55657d;
  font-size: 8px;
  font-weight: 750;
  letter-spacing: .07em;
}

.catalog-search.is-gold {
  border-color: rgba(217, 185, 110, .22);
  background: rgba(217, 185, 110, .045);
}

.catalog-search.is-gold:focus-within {
  border-color: rgba(217, 185, 110, .48);
  box-shadow: 0 0 0 4px rgba(217, 185, 110, .06);
}

.catalog-search.is-gold > svg {
  color: #c6a85f;
}

.catalog-search.is-cyan {
  margin-bottom: 18px;
  border-color: rgba(62, 231, 215, .2);
  background: rgba(62, 231, 215, .04);
}

.catalog-search.is-cyan:focus-within {
  border-color: rgba(62, 231, 215, .43);
  box-shadow: 0 0 0 4px rgba(62, 231, 215, .055);
}

.catalog-search.is-cyan > svg {
  color: #66d8d0;
}

.local-search-empty {
  grid-column: 1 / -1;
  margin: 14px 0 0;
  padding: 28px 18px;
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
  color: #718198;
  font-size: 11px;
  text-align: center;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
}

.filter-group > span {
  width: 48px;
  color: #63728a;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.filter-group button {
  min-height: 29px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  color: #8190a6;
  cursor: pointer;
  font-size: 10px;
  transition: all 160ms ease;
}

.filter-group button:hover {
  color: #c4d4eb;
}

.filter-group button.is-active {
  border-color: rgba(92, 158, 255, 0.25);
  background: rgba(62, 139, 255, 0.1);
  color: #acd2ff;
}

.episode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.episode-card {
  display: grid;
  min-width: 0;
  grid-template-columns: 43% 57%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: linear-gradient(145deg, rgba(16, 28, 47, 0.82), rgba(8, 15, 27, 0.92));
  transition: transform 220ms ease, border-color 220ms ease;
}

.episode-card:hover {
  transform: translateY(-4px);
  border-color: rgba(116, 184, 255, 0.3);
}

.episode-cover {
  position: relative;
  min-height: 268px;
  overflow: hidden;
  border-right: 1px solid var(--line);
  background-color: #0a1627;
}

.episode-cover::before {
  position: absolute;
  inset: 0;
  opacity: 0.65;
  background-image:
    linear-gradient(rgba(151, 182, 229, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(151, 182, 229, 0.08) 1px, transparent 1px);
  background-size: 30px 30px;
  content: "";
  mask-image: linear-gradient(135deg, #000, transparent 78%);
}

.cover-ai { background: radial-gradient(circle at 50% 50%, rgba(61, 125, 240, 0.3), transparent 36%), #0a1427; }
.cover-cloud { background: radial-gradient(circle at 50% 50%, rgba(64, 210, 209, 0.2), transparent 36%), #071b22; }
.cover-network { background: radial-gradient(circle at 50% 50%, rgba(126, 104, 240, 0.22), transparent 36%), #111027; }
.cover-architecture { background: radial-gradient(circle at 50% 50%, rgba(216, 174, 91, 0.22), transparent 36%), #1a1610; }

.episode-no,
.episode-year {
  position: absolute;
  z-index: 2;
  top: 16px;
  color: rgba(220, 233, 251, 0.53);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.episode-no { left: 17px; }
.episode-year { right: 17px; }

.cover-symbol {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  transform: translate(-50%, -50%);
  color: rgba(183, 214, 255, 0.93);
  font-size: 78px;
  font-weight: 180;
  letter-spacing: -0.12em;
  text-shadow: 0 0 30px rgba(74, 147, 255, 0.35);
}

.cover-symbol span {
  font-size: 24px;
  font-weight: 560;
  letter-spacing: -0.05em;
}

.cover-play {
  position: absolute;
  right: 17px;
  bottom: 16px;
  z-index: 3;
  display: grid;
  width: 39px;
  height: 39px;
  place-items: center;
  border: 1px solid rgba(210, 230, 255, 0.3);
  border-radius: 50%;
  background: rgba(5, 12, 23, 0.62);
  color: #e5f1ff;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: transform 180ms ease, background 180ms ease;
}

.cover-play:hover { transform: scale(1.08); background: rgba(47, 123, 235, 0.7); }
.cover-play svg { width: 16px; fill: currentColor; stroke-width: 0; }

.episode-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 25px 25px 21px;
}

.episode-copy > span {
  color: var(--blue-bright);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.episode-copy h3 {
  margin: 12px 0 10px;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.5;
}

.episode-copy > p {
  margin: 0;
  color: #77869c;
  font-size: 11px;
  line-height: 1.85;
}

.episode-copy footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 19px;
  border-top: 1px solid var(--line);
}

.episode-copy footer span { color: #5e6e86; font-size: 8px; font-weight: 700; letter-spacing: .06em; }
.episode-copy footer button,
.mini-course footer button {
  padding: 0;
  border: 0;
  background: transparent;
  color: #abcff8;
  cursor: pointer;
  font-size: 10px;
  font-weight: 700;
}

.filter-empty {
  padding: 56px 24px;
  border: 1px dashed var(--line-strong);
  border-radius: 16px;
  color: #76869f;
  text-align: center;
}

.catalog-more {
  display: flex;
  justify-content: center;
  margin-top: 38px;
}

.catalog-more button {
  display: grid;
  min-width: 240px;
  gap: 3px;
  padding: 13px 22px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
  color: #c0ccdd;
  cursor: pointer;
}

.catalog-more button span { font-size: 11px; font-weight: 650; }
.catalog-more button small { color: #5f6e84; font-size: 7px; letter-spacing: .14em; }

.vip-section {
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(58, 50, 31, 0.8);
  border-bottom: 1px solid rgba(58, 50, 31, 0.8);
  background:
    radial-gradient(circle at 10% 50%, rgba(172, 132, 58, 0.1), transparent 30%),
    linear-gradient(180deg, #0e0e0c, #0b0c0c);
}

.vip-section::before {
  position: absolute;
  inset: 0;
  opacity: 0.26;
  background-image: linear-gradient(90deg, rgba(222, 195, 129, 0.06) 1px, transparent 1px);
  background-size: 110px 100%;
  content: "";
  mask-image: linear-gradient(90deg, transparent, #000 30%, #000 70%, transparent);
}

.vip-inner {
  position: relative;
  padding: 130px 0 140px;
}

.catalog-header.is-light .section-kicker { color: #c8aa63; }
.catalog-header.is-light .catalog-badge { border-color: rgba(217, 185, 110, 0.25); background: rgba(217, 185, 110, 0.05); }
.catalog-header.is-light .catalog-badge span { color: #dcc17f; }

.vip-feature {
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(480px, 1.06fr);
  overflow: hidden;
  border: 1px solid rgba(214, 183, 109, 0.18);
  border-radius: 22px;
  background: rgba(13, 14, 13, 0.8);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.35);
}

.vip-feature-art {
  position: relative;
  min-height: 650px;
  overflow: hidden;
  padding: 48px;
  border-right: 1px solid rgba(214, 183, 109, 0.16);
  background:
    radial-gradient(circle at 60% 55%, rgba(191, 153, 70, 0.18), transparent 26%),
    linear-gradient(155deg, rgba(103, 78, 30, 0.14), transparent 50%),
    #10110f;
}

.vip-feature-art::before {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(224, 197, 130, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(224, 197, 130, 0.05) 1px, transparent 1px);
  background-size: 50px 50px;
  content: "";
  mask-image: linear-gradient(135deg, #000, transparent 78%);
}

.feature-label {
  position: relative;
  z-index: 2;
  color: #9a8654;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .2em;
}

.vip-feature-art > h3 {
  position: relative;
  z-index: 2;
  max-width: 460px;
  margin: 24px 0 13px;
  color: #f3ebd8;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(41px, 4.2vw, 60px);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 1.24;
}

.vip-feature-art > p {
  position: relative;
  z-index: 2;
  margin: 0;
  color: #716343;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .2em;
}

.feature-cube {
  position: absolute;
  right: 10%;
  bottom: 15%;
  display: grid;
  width: 230px;
  height: 230px;
  place-items: center;
  transform: rotate(12deg);
  border: 1px solid rgba(224, 195, 124, 0.32);
  background: linear-gradient(135deg, rgba(205, 172, 93, 0.16), rgba(20, 20, 16, 0.2));
  box-shadow: inset 0 0 55px rgba(204, 170, 91, 0.1), 0 45px 80px rgba(0, 0, 0, 0.28);
}

.feature-cube::before,
.feature-cube::after {
  position: absolute;
  border: 1px solid rgba(224, 195, 124, 0.15);
  content: "";
}

.feature-cube::before { inset: 18px; }
.feature-cube::after { inset: -28px; transform: rotate(45deg); }

.feature-cube span {
  color: #dec587;
  font-family: Georgia, serif;
  font-size: 128px;
  line-height: 1;
  text-shadow: 0 0 40px rgba(217, 185, 110, 0.28);
}

.feature-cube i {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #d8ba72;
  box-shadow: 0 0 12px rgba(217, 185, 110, 0.6);
}

.feature-cube i:nth-of-type(1) { top: -4px; left: -4px; }
.feature-cube i:nth-of-type(2) { top: -4px; right: -4px; }
.feature-cube i:nth-of-type(3) { right: -4px; bottom: -4px; }

.feature-play {
  position: absolute;
  z-index: 4;
  bottom: 45px;
  left: 48px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #cbbb95;
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
}

.feature-play span {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(217, 185, 110, 0.36);
  border-radius: 50%;
  background: rgba(217, 185, 110, 0.07);
}

.feature-play svg { width: 17px; fill: currentColor; stroke-width: 0; }

.curriculum {
  padding: 42px 42px 38px;
}

.curriculum-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.curriculum-heading span {
  color: #907d4c;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .22em;
}

.curriculum-heading h3 {
  margin: 7px 0 0;
  color: #eee5d2;
  font-size: 26px;
  font-weight: 560;
}

.curriculum-heading p {
  margin: 0 0 4px;
  color: #6d6248;
  font-size: 9px;
}

.curriculum ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.curriculum li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto 42px;
  align-items: center;
  gap: 14px;
  min-height: 74px;
  border-top: 1px solid rgba(214, 183, 109, 0.12);
}

.curriculum li > span {
  color: #7e6b3f;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

.curriculum li h4 {
  margin: 0 0 5px;
  color: #d9d1c1;
  font-size: 13px;
  font-weight: 600;
}

.curriculum li p {
  margin: 0;
  color: #716b5e;
  font-size: 9px;
}

.curriculum li > small {
  color: #766744;
  font-size: 8px;
  font-weight: 700;
  letter-spacing: .08em;
}

.curriculum-open {
  min-height: 27px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: rgba(217, 185, 110, .08);
  color: #bda976;
  cursor: pointer;
  font-size: 9px;
  font-weight: 700;
}

.curriculum-open:hover {
  background: rgba(217, 185, 110, .15);
  color: #e2cc96;
}

.outline-button {
  display: flex;
  min-height: 48px;
  align-items: center;
  justify-content: space-between;
  margin-top: 25px;
  padding: 0 17px;
  border: 1px solid rgba(217, 185, 110, 0.22);
  border-radius: 9px;
  background: rgba(217, 185, 110, 0.045);
  color: #cabb96;
  cursor: pointer;
  font-size: 10px;
  font-weight: 700;
  width: 100%;
}

.outline-button svg { width: 17px; }

.aiops-section {
  padding: 140px 0 150px;
}

.aiops-layout {
  display: grid;
  grid-template-columns: minmax(340px, .72fr) minmax(0, 1.28fr);
  gap: 20px;
}

.aiops-statement {
  position: relative;
  min-height: 540px;
  overflow: hidden;
  padding: 40px;
  border: 1px solid rgba(62, 231, 215, 0.18);
  border-radius: 19px;
  background:
    radial-gradient(circle at 50% 70%, rgba(39, 208, 199, 0.11), transparent 35%),
    linear-gradient(150deg, rgba(26, 111, 116, 0.11), transparent 52%),
    #071312;
}

.aiops-statement::before {
  position: absolute;
  inset: 0;
  opacity: .55;
  background-image:
    linear-gradient(rgba(89, 231, 222, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(89, 231, 222, .07) 1px, transparent 1px);
  background-size: 40px 40px;
  content: "";
  mask-image: linear-gradient(to bottom, #000, transparent 85%);
}

.aiops-statement > p,
.aiops-statement > h3,
.statement-flow {
  position: relative;
  z-index: 2;
}

.aiops-statement > p {
  margin: 0 0 12px;
  color: #68bcb7;
  font-size: 11px;
}

.aiops-statement > h3 {
  margin: 0;
  color: #dff9f5;
  font-size: clamp(31px, 3vw, 43px);
  font-weight: 560;
  letter-spacing: -.045em;
  line-height: 1.48;
}

.statement-flow {
  position: absolute;
  right: 34px;
  bottom: 45px;
  left: 34px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.statement-flow span {
  flex: 0 0 auto;
  color: #61c4be;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: .1em;
}

.statement-flow i {
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, rgba(62, 231, 215, .42), rgba(62, 231, 215, .08));
}

.aiops-course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.mini-course {
  position: relative;
  display: flex;
  min-height: 260px;
  flex-direction: column;
  padding: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: linear-gradient(150deg, rgba(16, 29, 48, .8), rgba(8, 15, 26, .9));
  transition: transform 200ms ease, border-color 200ms ease;
}

.mini-course:hover {
  transform: translateY(-4px);
  border-color: rgba(62, 231, 215, .25);
}

.mini-index {
  position: absolute;
  top: 22px;
  right: 22px;
  color: #4e6179;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
}

.mini-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  margin-bottom: 24px;
  border: 1px solid rgba(62, 231, 215, .22);
  border-radius: 11px;
  background: rgba(62, 231, 215, .05);
  color: #6bdbd3;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 19px;
}

.mini-course > small {
  color: #4ca9a4;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: .19em;
}

.mini-course h3 {
  margin: 9px 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
}

.mini-course > p {
  margin: 0;
  color: #76859b;
  font-size: 10px;
  line-height: 1.8;
}

.mini-course footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.mini-course footer span { color: #506078; font-size: 7px; font-weight: 700; letter-spacing: .09em; }
.mini-course footer button { color: #73d9d2; }

.course-dialog-open {
  overflow: hidden;
}

.course-dialog {
  width: min(1180px, calc(100% - 40px));
  max-width: none;
  max-height: calc(100dvh - 40px);
  padding: 0;
  overflow: auto;
  border: 1px solid rgba(111, 166, 241, .28);
  border-radius: 22px;
  background: #070d17;
  color: var(--text);
  box-shadow: 0 50px 150px rgba(0, 0, 0, .78), 0 0 80px rgba(47, 126, 237, .12);
}

.course-dialog::backdrop {
  background: rgba(2, 6, 12, .86);
  backdrop-filter: blur(14px);
}

.course-dialog-shell {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 82% 22%, rgba(44, 123, 238, .13), transparent 32%),
    linear-gradient(145deg, rgba(13, 23, 39, .98), rgba(5, 10, 18, .99));
}

.course-dialog-shell::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(91, 137, 203, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 137, 203, .035) 1px, transparent 1px);
  background-size: 54px 54px;
  content: "";
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

.course-dialog-topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 13, 23, .88);
  backdrop-filter: blur(18px);
}

.course-dialog-topbar > div {
  display: flex;
  align-items: center;
  gap: 15px;
}

.course-dialog-topbar > div > span {
  color: #bdd8fa;
  font-size: 11px;
  font-weight: 700;
}

.course-dialog-topbar small {
  padding-left: 15px;
  border-left: 1px solid var(--line-strong);
  color: #52627a;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: .18em;
}

.course-dialog-topbar > button {
  position: relative;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(255, 255, 255, .025);
  cursor: pointer;
}

.course-dialog-topbar > button span {
  position: absolute;
  top: 18px;
  left: 10px;
  width: 17px;
  height: 1px;
  background: #aab9cc;
  transform: rotate(45deg);
}

.course-dialog-topbar > button span:last-child { transform: rotate(-45deg); }

.course-dialog-intro {
  position: relative;
  z-index: 1;
  padding: 52px 54px 43px;
  border-bottom: 1px solid var(--line);
}

.course-dialog-intro h2 {
  max-width: 900px;
  margin: 13px 0 25px;
  font-size: clamp(34px, 4.4vw, 57px);
  font-weight: 560;
  letter-spacing: -.055em;
  line-height: 1.18;
}

.course-dialog-intro > div {
  display: grid;
  max-width: 820px;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 20px;
}

.course-dialog-intro > div > span {
  padding-top: 3px;
  color: var(--blue-bright);
  font-size: 9px;
  font-weight: 750;
}

.course-dialog-intro > div > p {
  margin: 0;
  color: #8391a6;
  font-size: 13px;
  line-height: 1.9;
}

.course-dialog-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 42px;
  padding: 44px 54px 56px;
}

.course-outline {
  padding: 27px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, .018);
}

.course-outline header span,
.course-video-panel header span {
  color: var(--blue-bright);
  font-size: 7px;
  font-weight: 800;
  letter-spacing: .2em;
}

.course-outline h3,
.course-video-panel h3 {
  margin: 7px 0 22px;
  font-size: 22px;
  font-weight: 590;
}

.course-outline ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.course-outline li {
  display: grid;
  min-height: 59px;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  border-top: 1px solid var(--line);
  color: #9aa8bb;
  font-size: 10px;
  line-height: 1.55;
}

.course-outline li span {
  color: #4f6f99;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
}

.course-video-panel {
  min-width: 0;
}

.course-video-panel > header {
  display: flex;
  min-height: 54px;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
}

.course-video-panel > header h3 { margin-bottom: 13px; }

.course-video-panel > header p {
  margin: 0 0 15px;
  color: #65768e;
  font-size: 9px;
}

.course-video-panel .video-frame {
  padding-top: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
}

.course-video-panel .external-video-link {
  width: min(100%, 330px);
  margin-top: 14px;
  margin-left: auto;
}

.media-section {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #080e18;
}

.media-section::before {
  position: absolute;
  top: -320px;
  left: 50%;
  width: 760px;
  height: 580px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: rgba(45, 115, 222, .09);
  filter: blur(90px);
  content: "";
}

.media-inner {
  position: relative;
  padding: 130px 0 140px;
}

.media-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  margin-bottom: 42px;
}

.media-heading .section-kicker {
  grid-column: 1 / -1;
  margin-bottom: 12px;
}

.media-heading > p:last-child {
  max-width: 420px;
  margin: 0 0 5px 80px;
  color: #7c8ca3;
  font-size: 13px;
  line-height: 1.8;
}

.media-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  background: #070c15;
  box-shadow: 0 40px 100px rgba(0, 0, 0, .4);
}

.video-frame {
  position: relative;
  min-width: 0;
  padding-top: 38px;
  overflow: hidden;
  border-right: 1px solid var(--line);
  background: #03060b;
}

.video-topline {
  position: absolute;
  inset: 0 0 auto;
  z-index: 3;
  display: flex;
  height: 38px;
  align-items: center;
  justify-content: space-between;
  padding: 0 15px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  background: #090f19;
  color: #65768e;
  font-size: 7px;
  font-weight: 800;
  letter-spacing: .16em;
}

.video-topline small {
  font-size: 7px;
}

.video-embed-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(circle at 50% 50%, rgba(43, 112, 218, .14), transparent 38%),
    #02050a;
}

.video-embed-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: #000;
}

.media-sidebar {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 27px;
}

.media-sidebar > div:first-child {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.media-sidebar > div:first-child > span {
  color: #66758c;
  font-size: 9px;
  font-weight: 700;
}

.source-tabs {
  display: flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, .025);
}

.source-tabs button {
  min-height: 27px;
  padding: 0 10px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: #65748a;
  cursor: pointer;
  font-size: 9px;
}

.source-tabs button.is-active {
  background: rgba(62, 139, 255, .15);
  color: #a9d1ff;
}

.now-playing {
  padding: 27px 0 23px;
}

.now-playing small {
  color: var(--blue-bright);
  font-size: 7px;
  font-weight: 800;
  letter-spacing: .2em;
}

.now-playing h3 {
  margin: 12px 0;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.5;
}

.now-playing p {
  margin: 0;
  color: #718097;
  font-size: 10px;
  line-height: 1.9;
}

.video-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.video-facts span {
  display: grid;
  gap: 5px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.video-facts span:first-child { padding-left: 0; border-left: 0; }
.video-facts small { color: #536178; font-size: 7px; }
.video-facts strong { color: #b3c0d3; font-size: 9px; font-weight: 650; }

.external-video-link {
  display: flex;
  min-height: 47px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding: 0 15px;
  border: 1px solid rgba(92, 158, 255, .24);
  border-radius: 9px;
  background: rgba(62, 139, 255, .06);
  color: #a8c9ee;
  font-size: 10px;
  font-weight: 700;
}

.external-video-link svg { width: 17px; }

/* Separate public catalog and course-detail pages. */
.desktop-nav a.is-current { color: var(--blue-bright); }
.catalog-page,
.course-page { min-height: 100vh; padding-top: var(--header-height); background: #f4f8fe; color: #17304f; }
.catalog-page-hero { position: relative; overflow: hidden; border-bottom: 1px solid rgba(38, 85, 149, .12); background: linear-gradient(135deg, #e9f3ff, #f9fbff 58%, #eef8fb); }
.catalog-page.is-vip .catalog-page-hero { background: linear-gradient(135deg, #fff9e9, #fff 58%, #f7f4ea); }
.catalog-page.is-aiops .catalog-page-hero { background: linear-gradient(135deg, #e5fbf8, #f9ffff 58%, #edf8fa); }
.catalog-page-hero-grid { position: absolute; inset: 0; opacity: .52; background-image: linear-gradient(rgba(42, 102, 178, .06) 1px, transparent 1px), linear-gradient(90deg, rgba(42, 102, 178, .06) 1px, transparent 1px); background-size: 62px 62px; mask-image: linear-gradient(90deg, black, transparent 78%); }
.catalog-page-hero-inner { position: relative; z-index: 1; width: min(calc(100% - 56px), var(--max)); margin: 0 auto; padding: 42px 0 44px; }
.catalog-page-back { display: inline-flex; margin-bottom: 30px; color: #6680a1; font-size: 10px; font-weight: 750; letter-spacing: .03em; }
.public-breadcrumbs { margin: 0 0 30px; color: #6680a1; font-size: 10px; font-weight: 750; letter-spacing: .03em; }
.public-breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; margin: 0; padding: 0; list-style: none; }
.public-breadcrumbs li { display: inline-flex; min-width: 0; align-items: center; gap: 7px; }
.public-breadcrumbs li + li::before { content: "›"; color: #91a4bb; }
.public-breadcrumbs a { color: inherit; }
.public-breadcrumbs a:hover { color: #1767d2; }
.public-breadcrumbs span { display: block; max-width: min(56vw, 560px); overflow: hidden; color: #385a82; text-overflow: ellipsis; white-space: nowrap; }
.course-page-hero-copy .public-breadcrumbs { margin-bottom: 14px; }
.catalog-page-hero-inner > p { margin: 0 0 12px; color: #2870ce; font-size: 9px; font-weight: 850; letter-spacing: .2em; }
.catalog-page.is-vip .catalog-page-hero-inner > p { color: #9d741c; }
.catalog-page.is-aiops .catalog-page-hero-inner > p { color: #078d88; }
.catalog-page-hero h1 { max-width: 900px; margin: 0; color: #132c4c; font-size: clamp(44px, 7vw, 84px); font-weight: 580; letter-spacing: -.065em; line-height: 1; }
.catalog-page-hero-inner > div { display: flex; align-items: center; gap: 21px; max-width: 790px; margin-top: 22px; }
.catalog-page-hero-inner > div span { flex: 0 0 auto; padding: 7px 10px; border: 1px solid rgba(31, 105, 205, .18); border-radius: 7px; color: #1c66c7; font-size: 9px; font-weight: 800; background: rgba(255, 255, 255, .65); }
.catalog-page-hero-inner > div p { margin: 0; color: #607794; font-size: 13px; line-height: 1.75; }
.catalog-page-hero-inner .mindmap-link { margin-top: 22px; border-color: rgba(38, 83, 145, .26); color: #3b6ca8; background: rgba(255, 255, 255, .7); }
.catalog-page-hero-inner .mindmap-link:hover { border-color: rgba(31, 105, 205, .5); color: #14559f; background: #fff; }
.catalog-page.is-vip .catalog-page-hero-inner .mindmap-link { border-color: rgba(158, 117, 28, .3); color: #8b6519; }
.catalog-page.is-vip .catalog-page-hero-inner .mindmap-link:hover { border-color: rgba(158, 117, 28, .58); color: #6f4f10; background: #fffaf0; }
.catalog-page.is-aiops .catalog-page-hero-inner .mindmap-link { border-color: rgba(5, 143, 139, .3); color: #087b78; }
.catalog-page.is-aiops .catalog-page-hero-inner .mindmap-link:hover { border-color: rgba(5, 143, 139, .58); color: #05615f; background: #f0fbfa; }
.catalog-page-body { padding-top: 38px; padding-bottom: 120px; }
.catalog-route-filters { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 20px; align-items: start; margin-bottom: 42px; padding: 18px 20px; border: 1px solid rgba(38, 83, 145, .13); border-radius: 15px; background: rgba(255, 255, 255, .83); box-shadow: 0 15px 42px rgba(43, 82, 136, .06); }
.catalog-route-filters > strong { padding: 9px 4px; color: #6b809c; font-size: 10px; letter-spacing: .08em; }
.catalog-route-filters > div { display: flex; flex-wrap: wrap; gap: 8px; }
.catalog-route-filters a { min-height: 34px; padding: 9px 14px; border: 1px solid transparent; border-radius: 8px; color: #5b7190; font-size: 11px; font-weight: 700; }
.catalog-route-filters a:hover { color: #1767d2; background: #f1f6fd; }
.catalog-route-filters a.is-active { border-color: rgba(31, 105, 205, .18); color: #155fc5; background: #eaf3ff; }
.catalog-page.is-vip .catalog-route-filters a.is-active { border-color: rgba(158, 117, 28, .18); color: #846018; background: #fff7e4; }

/* 多巴胺色板：进化论技术类型和 VIP 目录大类共用一套色号，
   筛选按钮、课程行和思维导图节点都从这里取值，改配色只要动这一处。
   --tp 是主色，--tp-soft 是行底色，--tp-chip 是按钮底色。 */
.is-topic.is-cyan,
.mindmap-node.is-cyan,
.mindmap-edge.is-cyan { --tp: #0e7490; --tp-soft: #ecfbff; --tp-chip: #d5f2fb; }
.is-topic.is-coral,
.mindmap-node.is-coral,
.mindmap-edge.is-coral { --tp: #d64550; --tp-soft: #fff1f2; --tp-chip: #ffdfe1; }
.is-topic.is-violet,
.mindmap-node.is-violet,
.mindmap-edge.is-violet { --tp: #7c3aed; --tp-soft: #f6f1ff; --tp-chip: #e9ddff; }
.is-topic.is-amber,
.mindmap-node.is-amber,
.mindmap-edge.is-amber { --tp: #b45309; --tp-soft: #fff8ec; --tp-chip: #ffecc9; }
.is-topic.is-mint,
.mindmap-node.is-mint,
.mindmap-edge.is-mint { --tp: #0f8a5f; --tp-soft: #ecfdf5; --tp-chip: #cdf3e2; }
.is-topic.is-blue,
.mindmap-node.is-blue,
.mindmap-edge.is-blue { --tp: #2563eb; --tp-soft: #eef4ff; --tp-chip: #dbe7ff; }
.is-topic.is-pink,
.mindmap-node.is-pink,
.mindmap-edge.is-pink { --tp: #be3d8f; --tp-soft: #fdf0f8; --tp-chip: #fbdcef; }
.is-topic.is-lime,
.mindmap-node.is-lime,
.mindmap-edge.is-lime { --tp: #4d7c0f; --tp-soft: #f6fbe9; --tp-chip: #e6f4c8; }
.is-topic.is-orange,
.mindmap-node.is-orange,
.mindmap-edge.is-orange { --tp: #c2410c; --tp-soft: #fff4ed; --tp-chip: #ffe2d1; }
.is-topic.is-slate,
.mindmap-node.is-slate,
.mindmap-edge.is-slate { --tp: #64748b; --tp-soft: #f5f7fa; --tp-chip: #e5eaf1; }

.catalog-route-filters.is-topics { margin-top: -26px; }
.catalog-route-filters a { display: inline-flex; align-items: center; gap: 7px; }
.catalog-route-filters a b { min-width: 18px; padding: 2px 5px; border-radius: 5px; color: #64748b; font-size: 10px; font-weight: 800; text-align: center; background: rgba(15, 39, 71, .06); }
.catalog-route-filters a.is-active b { color: #fff; background: rgba(15, 39, 71, .38); }
.catalog-route-filters a.is-topic i { width: 8px; height: 8px; border-radius: 2px; background: var(--tp); }
.catalog-route-filters a.is-topic b { color: var(--tp); background: var(--tp-chip); }
.catalog-route-filters a.is-topic.is-active b { color: #fff; background: var(--tp); }
.catalog-route-filters a.is-topic:hover { color: var(--tp); background: var(--tp-soft); }
.catalog-route-filters a.is-topic.is-active { border-color: var(--tp); color: var(--tp); background: var(--tp-chip); }

.public-course-table-row.is-topic { background: var(--tp-soft); box-shadow: inset 3px 0 0 var(--tp); }
.public-course-table-row.is-topic:hover { background: var(--tp-chip); }
.public-course-table-row.is-topic .public-course-table-title small { color: var(--tp); }

.catalog-page-toolbar { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 19px; }
.catalog-page-toolbar small { color: #4774ae; font-size: 8px; font-weight: 850; letter-spacing: .2em; }
.catalog-page-toolbar h2 { margin: 7px 0 0; color: #17314f; font-size: clamp(25px, 3vw, 38px); font-weight: 600; letter-spacing: -.035em; }
.catalog-table-search { display: grid; width: min(100%, 370px); grid-template-columns: 18px 1fr; align-items: center; gap: 10px; min-height: 48px; padding: 0 15px; border: 1px solid rgba(38, 83, 145, .15); border-radius: 11px; background: #fff; box-shadow: 0 10px 30px rgba(43, 82, 136, .05); }
.catalog-table-search svg { width: 17px; color: #6282aa; }
.catalog-table-search input { width: 100%; height: 46px; border: 0; outline: 0; color: #17314f; background: transparent; }
.public-course-table { overflow: hidden; border: 1px solid rgba(38, 83, 145, .14); border-radius: 18px; background: #fff; box-shadow: 0 22px 65px rgba(43, 82, 136, .08); }
.public-course-table-head,
.public-course-table-row { display: grid; grid-template-columns: minmax(300px, 1.1fr) minmax(260px, 1fr) 160px 130px; align-items: center; gap: 20px; }
.public-course-table-head { min-height: 45px; padding: 0 22px; color: #778ba4; font-size: 8px; font-weight: 850; letter-spacing: .12em; background: #f4f7fb; }
.public-course-table-row { min-height: 142px; padding: 20px 22px; border-top: 1px solid rgba(38, 83, 145, .1); transition: background 170ms ease; }
.public-course-table-row:hover { background: #f9fbfe; }
.public-course-table-title { display: grid; grid-template-columns: 118px minmax(0, 1fr); align-items: center; gap: 18px; }
.public-course-table-title img { width: 118px; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 10px; box-shadow: 0 8px 20px rgba(33, 64, 106, .12); }
.public-course-table-title small { color: #2b72cf; font-size: 8px; font-weight: 800; letter-spacing: .08em; }
.public-course-table-title h3 { margin: 7px 0 0; color: #193250; font-size: 16px; font-weight: 650; line-height: 1.45; }
.public-course-table-row > p { margin: 0; color: #687e99; font-size: 11px; line-height: 1.75; }
.public-course-table-facts { display: flex; flex-wrap: wrap; gap: 15px; }
.public-course-table-facts span { display: grid; gap: 3px; color: #7a8ca3; font-size: 9px; }
.public-course-table-facts b { color: #285988; font-size: 16px; }
.public-course-table-row > a { display: inline-flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 39px; padding: 0 12px; border: 1px solid rgba(34, 105, 202, .17); border-radius: 8px; color: #1766cb; font-size: 10px; font-weight: 750; background: #f1f7ff; }
.public-course-table-row > a svg { width: 15px; }
.catalog-search-no-result { padding: 45px 20px; color: #7388a2; text-align: center; font-size: 12px; }

.course-page { padding-bottom: 100px; }
.course-page-hero { display: grid; width: min(calc(100% - 56px), var(--max)); grid-template-columns: minmax(320px, .85fr) minmax(0, 1.15fr); align-items: center; gap: clamp(42px, 7vw, 100px); min-height: 610px; margin: 0 auto; padding: 65px 0; }
.course-page-cover { position: relative; }
.course-page-cover::after { position: absolute; z-index: -1; inset: 12% -8% -10% 10%; border-radius: 30px; background: rgba(56, 126, 219, .13); filter: blur(40px); content: ""; }
.course-page-cover img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border: 1px solid rgba(37, 83, 145, .15); border-radius: 20px; box-shadow: 0 35px 90px rgba(37, 72, 120, .18); }
.course-page-hero-copy > a { color: #657e9f; font-size: 10px; font-weight: 750; }
.course-page-hero-copy > p { margin: 48px 0 13px; color: #2c71cb; font-size: 9px; font-weight: 850; letter-spacing: .17em; }
.course-page-hero-copy h1 { margin: 0; color: #142d4c; font-size: clamp(38px, 5.5vw, 69px); font-weight: 590; letter-spacing: -.06em; line-height: 1.16; }
.course-page-access { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 27px; }
.course-page-access span,
.course-page-access b { padding: 7px 10px; border-radius: 7px; color: #2466b9; font-size: 9px; background: #e8f2ff; }
.course-page-access b { color: #627995; background: #eaf0f7; }
.course-page-content { display: grid; gap: 24px; }
.course-page-introduction,
.course-page-curriculum,
.course-page-recordings { overflow: hidden; border: 1px solid rgba(38, 83, 145, .13); border-radius: 21px; background: #fff; box-shadow: 0 18px 55px rgba(43, 82, 136, .07); }
.course-page-introduction { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 45px; padding: 43px; }
.course-page-introduction small,
.course-page-curriculum small,
.course-page-recordings small { color: #3475c5; font-size: 8px; font-weight: 850; letter-spacing: .18em; }
.course-page-introduction h2,
.course-page-curriculum h2,
.course-page-recordings h2 { margin: 8px 0 0; color: #193250; font-size: 27px; }
.course-page-introduction-copy { color: #5f7693; font-size: 14px; line-height: 2; }
.course-page-introduction-copy p { margin: 0 0 1.25em; }
.course-page-introduction-copy p:last-child { margin-bottom: 0; }
.course-page-curriculum > header,
.course-page-recordings > header { display: flex; align-items: end; justify-content: space-between; gap: 30px; padding: 32px 38px; border-bottom: 1px solid rgba(38, 83, 145, .1); }
.course-page-curriculum > header > span,
.curriculum-header-actions > span { color: #d5e4f8; font-family: ui-monospace, monospace; font-size: 54px; font-weight: 250; }
.course-page-curriculum ol { margin: 0; padding: 0 38px 18px; list-style: none; }
.course-page-curriculum li { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 16px; align-items: center; min-height: 94px; border-bottom: 1px solid rgba(38, 83, 145, .09); }
.course-page-curriculum li > span { color: #1c66c7; font-size: 21px; font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -.01em; line-height: 1.45; }
.course-page-curriculum li h3 { margin: 0 0 5px; color: #1c3553; font-size: 16px; line-height: 1.45; }
.course-page-curriculum li p { margin: 0; color: #72859d; font-size: 11px; }
.course-page-curriculum li.is-empty { display: block; padding: 30px 0; color: #7388a2; }

/* 两级目录：带子目录的主目录整行是一个折叠按钮，子目录列表默认收起 */
.curriculum-header-actions { display: flex; align-items: center; gap: 18px; }
.curriculum-expand-all {
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid rgba(38, 83, 145, .2);
  border-radius: 10px;
  color: #3b6ca8;
  background: #fff;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 180ms ease, color 180ms ease, background 180ms ease;
}
.curriculum-expand-all:hover { border-color: rgba(31, 105, 205, .46); color: #14559f; background: #f2f8ff; }

/* 折叠行里序号要和标题首行对齐，所以顶部内边距跟按钮保持一致 */
.course-page-curriculum li.has-children { align-items: start; }
.course-page-curriculum li.has-children > span { padding-top: 20px; }
.course-page-curriculum li.has-children > div { display: grid; align-content: center; padding: 0; }

.curriculum-node-toggle {
  position: relative;
  display: grid;
  gap: 5px;
  width: 100%;
  padding: 20px 42px 20px 0;
  border: 0;
  color: inherit;
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.curriculum-node-toggle h3 { margin: 0; }
.curriculum-node-toggle small { color: #3d73b4; font-size: 10px; font-weight: 750; letter-spacing: .06em; }
.curriculum-node-toggle:hover h3 { color: #14559f; }
.curriculum-node-toggle svg {
  position: absolute;
  top: 50%;
  right: 6px;
  width: 20px;
  fill: none;
  stroke: #6f8bb0;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transform: translateY(-50%);
  transition: transform 220ms ease, stroke 180ms ease;
}
.curriculum-node-toggle[aria-expanded="true"] svg { stroke: #1c66c7; transform: translateY(-50%) rotate(180deg); }

.course-page-curriculum .curriculum-subtree { margin: 0 0 18px; padding: 6px 0 0; border-left: 2px solid rgba(38, 83, 145, .14); }
.course-page-curriculum .curriculum-subtree li { grid-template-columns: 46px minmax(0, 1fr); gap: 12px; min-height: 0; align-items: start; padding: 11px 0 11px 16px; border-bottom: 0; }
.course-page-curriculum .curriculum-subtree li > span { color: #5a7fab; font-size: 14px; font-weight: 700; line-height: 1.5; }
.course-page-curriculum .curriculum-subtree h4 { margin: 0 0 3px; color: #29456a; font-size: 14px; font-weight: 600; line-height: 1.5; }
.course-page-curriculum .curriculum-subtree p { font-size: 11px; }
.course-page-curriculum .curriculum-subtree[hidden] { display: none; }
.course-page-recordings > header > p { max-width: 480px; margin: 0; color: #71859e; font-size: 11px; line-height: 1.7; }
.course-recording-list { display: grid; gap: 20px; padding: 28px 38px 38px; }
.course-recording-card { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(270px, .75fr); overflow: hidden; border: 1px solid rgba(38, 83, 145, .13); border-radius: 15px; background: #f8fbff; }
.course-recording-card .video-frame { border-right: 1px solid rgba(38, 83, 145, .12); }
.course-recording-card > div:last-child { display: flex; flex-direction: column; padding: 28px; }
.course-recording-card h3 { margin: 11px 0; color: #183251; font-size: 19px; line-height: 1.45; }
.course-recording-card p { margin: 0; color: #6f849e; font-size: 10px; }

@media (max-width: 1050px) {
  .public-course-table-head { display: none; }
  .public-course-table-row { grid-template-columns: minmax(0, 1fr) 130px; }
  .public-course-table-row > p { grid-column: 1 / -1; grid-row: 2; }
  .course-page-hero { grid-template-columns: 1fr; gap: 35px; padding: 50px 0 70px; }
  .course-page-cover { max-width: 760px; }
  .course-page-hero-copy > p { margin-top: 28px; }
}

@media (max-width: 700px) {
  .catalog-page-hero-inner,
  .course-page-hero { width: calc(100% - 30px); }
  .catalog-page-hero-inner > div { align-items: flex-start; flex-direction: column; }
  .catalog-page-body { padding-top: 35px; }
  .catalog-route-filters { grid-template-columns: 1fr; gap: 8px; }
  .catalog-page-toolbar { align-items: stretch; flex-direction: column; }
  .catalog-table-search { width: 100%; }
  .public-course-table-row { display: grid; grid-template-columns: 1fr; padding: 18px; }
  .public-course-table-title { grid-template-columns: 92px minmax(0, 1fr); }
  .public-course-table-title img { width: 92px; }
  .public-course-table-row > p { grid-column: auto; grid-row: auto; }
  .public-course-table-row > a { width: 100%; }
  .course-page-introduction { grid-template-columns: 1fr; gap: 22px; padding: 27px; }
  .course-page-curriculum > header,
  .course-page-recordings > header { align-items: flex-start; flex-direction: column; padding: 27px; }
  .course-page-curriculum ol { padding: 0 27px 12px; }
  .course-page-curriculum .curriculum-subtree { padding-left: 0; }
  .course-page-curriculum .curriculum-subtree li { grid-template-columns: 40px minmax(0, 1fr); padding-left: 12px; }
  .course-recording-list { padding: 20px; }
  .course-recording-card { grid-template-columns: 1fr; }
  .course-recording-card .video-frame { border-right: 0; border-bottom: 1px solid rgba(38, 83, 145, .12); }
}

.closing-section {
  position: relative;
  display: flex;
  min-height: 670px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 90px 28px;
  background:
    radial-gradient(circle at 50% 50%, rgba(42, 108, 213, .13), transparent 28%),
    #060b14;
  text-align: center;
}

.closing-section > img {
  position: relative;
  z-index: 2;
  width: 58px;
  height: 58px;
  margin-bottom: 23px;
  filter: drop-shadow(0 0 20px rgba(61, 139, 255, .3));
}

.closing-section > p {
  position: relative;
  z-index: 2;
  margin: 0 0 20px;
  color: #6b8ab6;
  font-size: 8px;
  font-weight: 800;
  letter-spacing: .28em;
}

.closing-section h2 {
  position: relative;
  z-index: 2;
  margin: 0 0 37px;
  color: #edf4ff;
  font-size: clamp(39px, 4.8vw, 64px);
  font-weight: 580;
  letter-spacing: -.06em;
  line-height: 1.3;
}

.closing-section .primary-button {
  position: relative;
  z-index: 2;
}

.closing-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 730px;
  height: 730px;
  transform: translate(-50%, -50%);
}

.closing-orbit i {
  position: absolute;
  border: 1px solid rgba(104, 158, 235, .1);
  border-radius: 50%;
}

.closing-orbit i:nth-child(1) { inset: 0; border-style: dashed; animation: orbit-spin 80s linear infinite; }
.closing-orbit i:nth-child(2) { inset: 15%; animation: orbit-spin-reverse 60s linear infinite; }
.closing-orbit i:nth-child(3) { inset: 31%; border-style: dashed; animation: orbit-spin 40s linear infinite; }

.site-footer {
  display: grid;
  width: min(calc(100% - 56px), var(--max));
  grid-template-columns: auto minmax(240px, 1fr) auto;
  align-items: center;
  gap: 38px;
  margin: 0 auto;
  padding: 42px 0;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand img { width: 32px; height: 32px; }
.footer-brand div { display: grid; gap: 2px; }
.footer-brand strong { font-size: 13px; letter-spacing: .1em; }
.footer-brand span { color: #4f5d71; font-size: 6px; font-weight: 800; letter-spacing: .18em; }
.site-footer > p { margin: 0; color: #59677c; font-size: 10px; }
.site-footer nav { display: flex; gap: 22px; }
.site-footer nav a { color: #69778d; font-size: 9px; }
.site-footer nav a:hover { color: #b5c7df; }
.site-footer > small { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid var(--line); color: #3f4b5d; font-size: 7px; letter-spacing: .12em; }

.searchable.is-search-hidden {
  display: none !important;
}

@keyframes orbit-spin {
  to { transform: rotate(360deg); }
}

@keyframes orbit-spin-reverse {
  to { transform: rotate(-360deg); }
}

@keyframes beacon-pulse {
  0%, 100% { transform: scale(.75); opacity: .45; }
  50% { transform: scale(1.35); opacity: 1; }
}

@keyframes scroll-line {
  0% { transform: translateY(0); }
  100% { transform: translateY(280%); }
}

@media (max-width: 1120px) {
  .desktop-nav { gap: 20px; }
  .header-search-button span, .header-search-button kbd { display: none; }
  .hero { min-height: 800px; }
  .hero-inner { grid-template-columns: minmax(0, 1fr) 440px; gap: 30px; }
  .orbit-shell { width: 430px; }
  .signal-card-top { right: 0; }
  .signal-card-bottom { left: 0; }
  .system-art { height: 270px; }
  .section-heading { gap: 55px; }
  .episode-card { grid-template-columns: 40% 60%; }
  .vip-feature-art { padding: 38px; }
  .feature-play { left: 38px; }
  .curriculum { padding: 34px; }
  .media-stage { grid-template-columns: minmax(0, 1fr) 300px; }
}

@media (max-width: 900px) {
  :root { --header-height: 68px; }
  html { scroll-padding-top: 72px; }
  .site-header { height: 68px; background: rgba(6, 11, 20, .78); backdrop-filter: blur(18px); }
  .header-inner { width: min(calc(100% - 36px), var(--max)); }
  .desktop-nav, .header-search-button, .header-cta { display: none; }
  .menu-toggle { display: grid; width: 40px; height: 40px; place-content: center; gap: 6px; padding: 0; border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,.035); cursor: pointer; }
  .menu-toggle span { display: block; width: 17px; height: 1px; background: #bcc9da; transition: transform 180ms ease; }
  .site-header.menu-active .menu-toggle span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .site-header.menu-active .menu-toggle span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .mobile-nav { position: fixed; inset: 68px 0 auto; display: grid; max-height: 0; overflow: hidden; border-bottom: 1px solid transparent; background: rgba(6,11,20,.97); opacity: 0; transition: max-height 220ms ease, opacity 180ms ease, padding 220ms ease; backdrop-filter: blur(18px); }
  .mobile-nav a { width: calc(100% - 36px); margin: 0 auto; padding: 15px 0; border-bottom: 1px solid var(--line); color: #adb9ca; font-size: 13px; }
  .mobile-language-switcher { display: flex; width: calc(100% - 36px); gap: 7px; margin: 0 auto 7px; padding: 9px 0 13px; border-bottom: 1px solid var(--line); }
  .mobile-language-switcher a { width: auto; margin: 0; padding: 7px 12px; border: 1px solid var(--line); border-radius: 7px; color: #76869d; }
  .mobile-language-switcher a.is-active { border-color: rgba(92,158,255,.32); background: rgba(62,139,255,.09); color: #b8d8ff; }
  .site-header.menu-active .mobile-nav { max-height: 300px; padding: 8px 0 20px; border-color: var(--line); opacity: 1; }
  .hero { min-height: auto; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; padding: 140px 0 100px; }
  .hero-copy { text-align: center; }
  .eyebrow, .hero-actions, .hero-metrics { justify-content: center; }
  .hero h1 { font-size: clamp(56px, 11vw, 80px); }
  .hero-orbit { min-height: 480px; }
  .orbit-shell { width: min(480px, 74vw); }
  .signal-card-top { right: 7%; }
  .signal-card-bottom { left: 7%; }
  .scroll-cue { display: none; }
  .section-heading { grid-template-columns: 1fr; gap: 25px; }
  .section-heading > p { max-width: 640px; }
  .system-grid { grid-template-columns: 1fr; }
  .system-card { display: grid; grid-template-columns: 45% 55%; }
  .system-art { height: 100%; min-height: 340px; border-right: 1px solid var(--line); border-bottom: 0; }
  .system-content { display: flex; flex-direction: column; justify-content: center; }
  .system-content > p { min-height: 0; }
  .episode-grid { grid-template-columns: 1fr; }
  .episode-card { grid-template-columns: 38% 62%; }
  .vip-feature { grid-template-columns: 1fr; }
  .vip-feature-art { min-height: 590px; border-right: 0; border-bottom: 1px solid rgba(214,183,109,.16); }
  .aiops-layout { grid-template-columns: 1fr; }
  .aiops-statement { min-height: 400px; }
  .course-dialog-content { grid-template-columns: 1fr; }
  .course-outline ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 24px; }
  .media-heading { grid-template-columns: 1fr; gap: 16px; }
  .media-heading > p:last-child { margin: 0; }
  .media-stage { grid-template-columns: 1fr; }
  .video-frame { border-right: 0; border-bottom: 1px solid var(--line); }
  .media-sidebar { min-height: 370px; }
  .site-footer { grid-template-columns: 1fr auto; }
  .site-footer > p { grid-column: 1 / -1; }
  .site-footer nav { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .header-inner, .section, .site-footer, .search-dock { width: calc(100% - 32px); }
  .brand-copy strong { font-size: 15px; }
  .hero-inner { width: calc(100% - 32px); padding: 122px 0 82px; }
  .hero h1 { font-size: clamp(48px, 15vw, 64px); letter-spacing: -.07em; }
  .hero h1 em::after { display: none; }
  .hero-lead { font-size: 14px; line-height: 1.85; }
  .hero-lead br { display: none; }
  .hero-actions { flex-direction: column; gap: 17px; }
  .primary-button { width: 100%; }
  .hero-metrics { width: 100%; }
  .hero-metrics div { min-width: 0; flex: 1; padding: 0 12px; }
  .hero-metrics dt { font-size: 20px; }
  .hero-metrics dd { font-size: 8px; line-height: 1.5; }
  .hero-orbit { min-height: 390px; }
  .orbit-shell { width: min(370px, 97vw); }
  .orbit-core { width: 105px; height: 105px; }
  .orbit-core img { width: 39px; height: 39px; }
  .orbit-core span { bottom: 14px; }
  .signal-card { min-width: 145px; padding: 11px 12px; }
  .signal-card strong { font-size: 11px; }
  .signal-card-top { top: 8%; right: -1%; }
  .signal-card-bottom { bottom: 5%; left: -1%; }
  .search-dock { margin-top: -29px; }
  .search-shell { min-height: 58px; grid-template-columns: 20px minmax(0,1fr) auto; gap: 11px; padding: 0 16px; border-radius: 14px; }
  .search-shell input { height: 56px; font-size: 13px; }
  .search-shell > svg { width: 19px; }
  .search-shortcut { display: none; }
  .search-suggestions { flex-wrap: wrap; padding-top: 12px; }
  .search-suggestions > span { width: 100%; }
  .search-suggestions p { width: 100%; margin: 5px 0 0; }
  .course-systems { padding: 110px 0 96px; }
  .section-heading h2, .catalog-header h2, .media-heading h2 { font-size: 38px; }
  .system-card { display: block; }
  .system-art { height: 285px; min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .system-content { padding: 24px 22px 26px; }
  .system-content h3 { font-size: 24px; }
  .catalog-header { grid-template-columns: 48px minmax(0, 1fr); gap: 15px; margin-bottom: 37px; }
  .catalog-number { font-size: 39px; }
  .catalog-badge { grid-column: 2; justify-self: start; min-width: 0; text-align: left; }
  .evolution-section, .aiops-section { padding: 95px 0 105px; }
  .filter-panel { padding: 15px; }
  .catalog-search { grid-template-columns: 18px minmax(0,1fr); padding: 0 14px; }
  .catalog-search > span { display: none; }
  .filter-group > span { width: 100%; margin-bottom: 2px; }
  .episode-card { display: block; }
  .episode-cover { min-height: 230px; border-right: 0; border-bottom: 1px solid var(--line); }
  .episode-copy { min-height: 255px; }
  .vip-inner { padding: 95px 0 105px; }
  .vip-feature-art { min-height: 520px; padding: 28px; }
  .vip-feature-art > h3 { font-size: 39px; }
  .feature-cube { right: 8%; bottom: 16%; width: 185px; height: 185px; }
  .feature-cube span { font-size: 100px; }
  .feature-play { bottom: 27px; left: 28px; }
  .curriculum { padding: 26px 22px; }
  .curriculum-heading { align-items: start; }
  .curriculum li { grid-template-columns: 29px minmax(0, 1fr) 38px; min-height: 83px; }
  .curriculum li > small { display: none; }
  .aiops-statement { min-height: 410px; padding: 28px; }
  .aiops-statement > h3 { font-size: 29px; }
  .statement-flow { right: 22px; left: 22px; gap: 5px; }
  .statement-flow span { font-size: 6px; }
  .aiops-course-grid { grid-template-columns: 1fr; }
  .mini-course { min-height: 250px; }
  .course-dialog { width: calc(100% - 16px); max-height: calc(100dvh - 16px); border-radius: 15px; }
  .course-dialog-topbar { min-height: 60px; padding: 0 17px; }
  .course-dialog-topbar small { display: none; }
  .course-dialog-intro { padding: 37px 22px 31px; }
  .course-dialog-intro h2 { font-size: 35px; }
  .course-dialog-intro > div { grid-template-columns: 1fr; gap: 10px; }
  .course-dialog-content { gap: 31px; padding: 28px 22px 34px; }
  .course-outline { padding: 21px; }
  .course-outline ol { display: block; }
  .course-video-panel > header { display: block; }
  .course-video-panel > header p { margin-top: -8px; }
  .course-video-panel .external-video-link { width: 100%; }
  .media-inner { padding: 95px 0 105px; }
  .media-sidebar { min-height: 410px; padding: 22px; }
  .video-facts { gap: 0; }
  .closing-section { min-height: 570px; }
  .closing-section h2 { font-size: 38px; }
  .closing-orbit { width: 560px; height: 560px; }
  .site-footer { grid-template-columns: 1fr; gap: 22px; }
  .site-footer nav { display: grid; grid-template-columns: repeat(2, auto); justify-content: start; }
}

/* 右侧咨询悬浮条：纯 HTML/CSS，「在线咨询」直接跳转 53KF 会话页，不加载第三方脚本 */
.contact-rail {
  position: fixed;
  top: 50%;
  right: 18px;
  z-index: 60;
  display: grid;
  gap: 9px;
  transform: translateY(-50%);
}

.contact-rail-item {
  position: relative;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  padding: 0;
  border: 1px solid rgba(38, 83, 145, .14);
  border-radius: 17px;
  color: #5b7392;
  background: rgba(255, 255, 255, .93);
  box-shadow: 0 14px 34px rgba(43, 82, 136, .13);
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition: color 200ms ease, border-color 200ms ease, transform 200ms ease, box-shadow 200ms ease;
}

.contact-rail-item svg { width: 22px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.contact-rail-item:hover { color: #14559f; border-color: rgba(31, 105, 205, .34); transform: translateY(-2px); box-shadow: 0 18px 40px rgba(43, 82, 136, .2); }

.contact-rail-item.is-consult {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(150deg, #3d8bee, #1a5cc0);
  box-shadow: 0 16px 36px rgba(26, 92, 192, .38);
}
.contact-rail-item.is-consult:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 20px 44px rgba(26, 92, 192, .48); }

/* 呼吸光晕，只在主按钮上用一次，避免整条都在动 */
.contact-rail-glow {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 0 0 0 rgba(61, 139, 238, .5);
  animation: contact-rail-pulse 2.8s ease-out infinite;
}

@keyframes contact-rail-pulse {
  0% { box-shadow: 0 0 0 0 rgba(61, 139, 238, .45); }
  70% { box-shadow: 0 0 0 14px rgba(61, 139, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(61, 139, 238, 0); }
}

.contact-rail-label {
  position: absolute;
  top: 50%;
  right: calc(100% + 11px);
  display: grid;
  gap: 3px;
  padding: 11px 15px;
  border-radius: 14px;
  color: #eaf3ff;
  background: #12325a;
  box-shadow: 0 16px 38px rgba(11, 37, 71, .3);
  white-space: nowrap;
  text-align: left;
  opacity: 0;
  transform: translate(8px, -50%);
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
}

.contact-rail-label::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -5px;
  width: 10px;
  height: 10px;
  background: inherit;
  transform: translateY(-50%) rotate(45deg);
}

.contact-rail-label b { font-size: 14px; font-weight: 700; letter-spacing: .01em; }
.contact-rail-label small { color: #9fbde4; font-size: 11px; }
.contact-rail-label.is-qr { display: grid; justify-items: center; gap: 8px; padding: 12px; }
.contact-rail-label.is-qr img { display: block; width: 132px; height: 132px; border-radius: 9px; background: #fff; }

.contact-rail-item:hover .contact-rail-label,
.contact-rail-item:focus-visible .contact-rail-label,
.contact-rail-item.is-static.is-open .contact-rail-label { opacity: 1; transform: translate(0, -50%); }

.contact-rail-item.is-top[hidden] { display: none; }

@media (max-width: 900px) {
  .contact-rail { top: auto; right: 13px; bottom: 18px; gap: 8px; transform: none; }
  .contact-rail-item { width: 46px; height: 46px; border-radius: 15px; }
  .contact-rail-item svg { width: 20px; }
  .contact-rail-label { display: none; }
  .contact-rail-item.is-static.is-open .contact-rail-label.is-qr {
    top: auto;
    right: calc(100% + 10px);
    bottom: 0;
    display: grid;
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
  .contact-rail-item.is-static.is-open .contact-rail-label.is-qr::after {
    top: auto;
    bottom: 17px;
    transform: rotate(45deg);
  }
}

/* Auto-generated curriculum mind map page. */
.mindmap-page {
  --mm-accent: #1f69cd;
  --mm-accent-soft: rgba(31, 105, 205, .12);
  --mm-accent-line: rgba(31, 105, 205, .34);
  min-height: 100vh;
  padding-top: var(--header-height);
  background: #f4f8fe;
  color: #17304f;
}

.mindmap-page.is-vip { --mm-accent: #9d741c; --mm-accent-soft: rgba(158, 117, 28, .12); --mm-accent-line: rgba(158, 117, 28, .34); }
.mindmap-page.is-aiops { --mm-accent: #078d88; --mm-accent-soft: rgba(5, 143, 139, .12); --mm-accent-line: rgba(5, 143, 139, .34); }

.mindmap-hero { border-bottom: 1px solid rgba(38, 85, 149, .12); background: linear-gradient(135deg, #e9f3ff, #f9fbff 58%, #eef8fb); }
.mindmap-page.is-vip .mindmap-hero { background: linear-gradient(135deg, #fff9e9, #fff 58%, #f7f4ea); }
.mindmap-page.is-aiops .mindmap-hero { background: linear-gradient(135deg, #e5fbf8, #f9ffff 58%, #edf8fa); }
.mindmap-hero-inner { width: min(calc(100% - 56px), var(--max)); margin: 0 auto; padding: 38px 0 34px; }
.mindmap-hero-inner > p { margin: 0 0 10px; color: var(--mm-accent); font-size: 9px; font-weight: 850; letter-spacing: .2em; }
.mindmap-hero h1 { margin: 0; color: #132c4c; font-size: clamp(32px, 5vw, 58px); font-weight: 580; letter-spacing: -.055em; line-height: 1.05; }
.mindmap-hero-note { max-width: 720px; margin: 14px 0 0; color: #607794; font-size: 13px; line-height: 1.75; letter-spacing: 0; }

.mindmap-body { width: min(calc(100% - 56px), var(--max)); margin: 0 auto; padding: 26px 0 90px; }
.mindmap-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 16px; }
.mindmap-toolbar-group { display: flex; gap: 8px; }
.mindmap-toolbar button {
  min-height: 36px;
  padding: 0 15px;
  border: 1px solid rgba(38, 83, 145, .18);
  border-radius: 9px;
  color: #3b6ca8;
  font-size: 11px;
  font-weight: 750;
  background: #fff;
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.mindmap-toolbar button:hover { border-color: var(--mm-accent-line); color: var(--mm-accent); background: var(--mm-accent-soft); }
.mindmap-toolbar-group.is-zoom button { min-width: 40px; font-size: 14px; }
.mindmap-scale { margin: 0 0 0 auto; color: #6b809c; font-size: 11px; font-weight: 650; }

.mindmap-stage {
  position: relative;
  height: clamp(460px, 72vh, 860px);
  overflow: hidden;
  border: 1px solid rgba(38, 83, 145, .14);
  border-radius: 18px;
  background:
    radial-gradient(circle at 1px 1px, rgba(42, 102, 178, .06) 1px, transparent 0) 0 0 / 30px 30px,
    #fdfeff;
  box-shadow: 0 22px 65px rgba(43, 82, 136, .08);
  touch-action: none;
}

.mindmap-stage.is-ready { cursor: grab; }
.mindmap-stage.is-grabbing { cursor: grabbing; }
.mindmap-svg { display: block; width: 100%; height: 100%; }

.mindmap-hint {
  position: absolute;
  right: 14px;
  bottom: 12px;
  z-index: 1;
  margin: 0;
  padding: 7px 12px;
  border-radius: 8px;
  color: #6b809c;
  font-size: 10px;
  font-weight: 650;
  background: rgba(255, 255, 255, .88);
  pointer-events: none;
}

/* 节点按“是什么”着色，而不是按“在第几层”。VIP 比 AIOps 多了目录层，
   同一个深度在两边含义不同，按 kind 决定深浅、按所属大类的色号决定色相，
   这样一张图上不同大类一眼可分，同一大类的整条分支又是一片。 */
.mindmap-edge { fill: none; stroke: var(--tp); stroke-width: 1.4; opacity: .55; }
.mindmap-edge.is-to-group { stroke-width: 2; opacity: .85; }
.mindmap-edge.is-to-course { stroke-width: 1.6; opacity: .7; }
.mindmap-edge.is-to-chapter { stroke-width: 1.1; opacity: .4; }

.mindmap-node-box { fill: #fff; stroke: rgba(30, 70, 126, .42); stroke-width: 1; }
/* stroke 必须显式关掉：全局 svg 规则设了 stroke: currentColor 且宽度 1.8，
   而 stroke 在 SVG 里会继承，不关掉每个字都会被勾一圈描边，又粗又糊。
   字号字重改动要同步 public-mindmap.js 的 fontFor()；中文字体缺 500/600 字重，
   浏览器会合成加粗，所以这里只用 400 与 700。 */
.mindmap-node-text { fill: #1c3557; stroke: none; font-size: 13px; font-weight: 400; }
.mindmap-node-body { cursor: default; }
.mindmap-node.is-kind-root .mindmap-node-box { fill: #12325a; stroke: #0b2544; }
.mindmap-node.is-kind-root .mindmap-node-text { fill: #f4f9ff; font-weight: 700; }
.mindmap-node.is-kind-group .mindmap-node-box { fill: var(--tp-chip); stroke: var(--tp); stroke-width: 1.6; }
.mindmap-node.is-kind-group .mindmap-node-text { fill: var(--tp); font-weight: 700; }
.mindmap-node.is-kind-course .mindmap-node-box { fill: var(--tp-soft); stroke: var(--tp); stroke-width: 1.4; }
.mindmap-node.is-kind-course .mindmap-node-text { fill: var(--tp); font-weight: 700; }
.mindmap-node.is-kind-course .mindmap-node-body { cursor: pointer; }
.mindmap-node.is-kind-course .mindmap-node-body:hover .mindmap-node-box { fill: var(--tp-chip); }
.mindmap-node.is-kind-chapter .mindmap-node-box { fill: #fff; stroke: var(--tp); stroke-opacity: .35; }
.mindmap-node.is-kind-chapter .mindmap-node-text { fill: #40587a; }

.mindmap-toggle { cursor: pointer; }
.mindmap-toggle-ring { fill: #fff; stroke: rgba(38, 83, 145, .3); stroke-width: 1.2; }
.mindmap-toggle-sign { fill: none; stroke: #43648e; stroke-width: 1.7; stroke-linecap: round; }
.mindmap-toggle:hover .mindmap-toggle-ring { fill: var(--mm-accent-soft); stroke: var(--mm-accent); }
.mindmap-toggle:hover .mindmap-toggle-sign { stroke: var(--mm-accent); }

.mindmap-outline { margin-top: 26px; }
.mindmap-outline h2 { margin: 0 0 14px; color: #17314f; font-size: 22px; font-weight: 620; }
.mindmap-outline ol { margin: 0; padding-left: 22px; list-style: none; }
.mindmap-outline li { margin: 5px 0; color: #4f6785; font-size: 13px; line-height: 1.7; }
.mindmap-outline b { margin-right: 6px; color: var(--mm-accent); font-variant-numeric: tabular-nums; }
.mindmap-outline a { color: #23405f; font-weight: 650; }

.mindmap-outline.is-fallback {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  border: 0;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 900px) {
  .mindmap-hero-inner,
  .mindmap-body { width: calc(100% - 32px); }
  .mindmap-stage { height: clamp(380px, 62vh, 620px); }
  .mindmap-scale { width: 100%; margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}