:root {
  --bg: #090d12;
  --bg-soft: #0d141c;
  --panel: #121b25;
  --panel-strong: #172330;
  --line: #293746;
  --ink: #f2f5f7;
  --muted: #9da9b5;
  --cyan: #49d8da;
  --yellow: #ffc94d;
  --coral: #f07a65;
  --green: #70bf86;
  --pink: #db7fa8;
  --orange: #e99b54;
  --blue: #7198df;
  --focus-accent: var(--yellow);
  --font: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  --mono: Consolas, "SFMono-Regular", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 78px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font: 15px/1.7 var(--font);
  -webkit-font-smoothing: antialiased;
}
button, a { font: inherit; }
a { color: inherit; }
img { max-width: 100%; }
[hidden] { display: none !important; }
::selection { color: #111; background: var(--yellow); }

.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 0 clamp(18px, 4vw, 58px);
  border-bottom: 1px solid rgba(255,255,255,.1);
  background: rgba(9,13,18,.94);
  backdrop-filter: blur(16px);
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
  flex: 0 0 auto;
}
.brand img { width: 36px; height: 36px; object-fit: contain; }
.brand span { display: flex; flex-direction: column; line-height: 1.05; }
.brand strong { font-size: 14px; }
.brand small {
  margin-top: 5px;
  color: var(--muted);
  font: 700 8px/1 var(--mono);
  letter-spacing: .08em;
}
.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-links a {
  position: relative;
  color: #b8c2cc;
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -8px;
  height: 2px;
  background: var(--yellow);
  transition: right .2s ease;
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { right: 0; }

.hero {
  position: relative;
  min-height: 650px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  isolation: isolate;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(5,8,12,.76) 0%, rgba(5,8,12,.46) 48%, rgba(5,8,12,.1) 100%),
    url("../../assets/web/school-campus_generated.png") center 48% / cover no-repeat;
}
.hero-shade {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6,9,13,.05), rgba(6,9,13,.24) 55%, #090d12 100%),
    repeating-linear-gradient(90deg, transparent 0, transparent calc(25% - 1px), rgba(255,255,255,.05) 25%);
}
.hero-content {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 110px 0 64px;
}
.eyebrow {
  margin: 0;
  color: var(--cyan);
  font: 800 10px/1.35 var(--mono);
  letter-spacing: .11em;
}
.hero h1 {
  max-width: 760px;
  margin: 13px 0 18px;
  font-size: clamp(54px, 8vw, 96px);
  line-height: .95;
  letter-spacing: -.06em;
}
.hero-copy {
  max-width: 660px;
  margin: 0;
  color: #c8d0d8;
  font-size: 17px;
  line-height: 1.85;
}
.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 30px;
}
.primary-action {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--yellow);
  border-radius: 6px;
  color: #171106;
  background: var(--yellow);
  text-decoration: none;
  font-size: 13px;
  font-weight: 900;
}
.primary-action:hover { background: #ffda78; transform: translateY(-1px); }
.text-action {
  color: #dce3e9;
  text-decoration: none;
  font-size: 13px;
  font-weight: 800;
}
.text-action span { color: var(--cyan); margin-left: 6px; }
.hero-facts {
  width: min(620px, 100%);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 44px 0 0;
  border-top: 1px solid rgba(255,255,255,.2);
  border-bottom: 1px solid rgba(255,255,255,.2);
}
.hero-facts div { padding: 17px 18px; border-left: 1px solid rgba(255,255,255,.14); }
.hero-facts div:first-child { border-left: 0; }
.hero-facts dt { color: var(--yellow); font: 900 20px/1 var(--mono); }
.hero-facts dd { margin: 8px 0 0; color: #acb7c1; font-size: 11px; font-weight: 700; }

.section-inner { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.group-band { padding: 88px 0 96px; background: #0b1016; }
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 440px);
  align-items: end;
  gap: 44px;
  margin-bottom: 36px;
}
.section-heading h2,
.math-heading h2 {
  margin: 7px 0 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -.04em;
}
.section-heading > p,
.math-heading > div > p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.group-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.group-card {
  --card-accent: var(--cyan);
  --card-image: none;
  position: relative;
  min-height: 250px;
  padding: 27px 28px 24px;
  overflow: hidden;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  background: var(--panel);
  text-decoration: none;
  transition: background .22s ease, transform .22s ease;
}
.group-card[data-group="art"] {
  --card-accent: var(--coral);
  --card-image: url("../../assets/web/school-group-art_generated.png");
}
.group-card[data-group="math"] {
  --card-accent: var(--yellow);
  --card-image: url("../../assets/web/school-group-math_generated.png");
}
.group-card[data-group="code"] {
  --card-accent: var(--green);
  --card-image: url("../../assets/web/school-group-code_generated.png");
}
.group-card[data-group="brand"] {
  --card-accent: var(--pink);
  --card-image: url("../../assets/web/school-group-brand_generated.png");
}
.group-card[data-group="model"] {
  --card-accent: var(--orange);
  --card-image: url("../../assets/web/school-group-model_generated.png");
}
.group-card[data-group="enterprise"] {
  --card-accent: var(--blue);
  --card-image: url("../../assets/web/school-group-enterprise_generated.png");
}
.group-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--card-accent);
  transform: scaleX(.28);
  transform-origin: left;
  transition: transform .25s ease;
}
.group-card::after {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 0;
  border: 0;
  border-radius: 0;
  background:
    linear-gradient(90deg, rgba(8,13,18,.78) 0%, rgba(8,13,18,.56) 48%, rgba(8,13,18,.16) 100%),
    linear-gradient(180deg, rgba(8,13,18,.02), rgba(8,13,18,.4)),
    var(--card-image) center 42% / cover no-repeat;
  opacity: .96;
  transition: opacity .25s ease, transform .4s ease;
}
.group-card > * { position: relative; z-index: 1; }
.group-card:hover,
.group-card.active { z-index: 1; background: var(--panel-strong); transform: translateY(-3px); }
.group-card:hover::before,
.group-card.active::before { transform: scaleX(1); }
.group-card:hover::after,
.group-card.active::after { opacity: 1; transform: scale(1.025); }
.group-index { color: var(--card-accent); font: 900 10px/1 var(--mono); }
.group-mark {
  position: absolute;
  top: 25px;
  right: 26px;
  color: var(--card-accent);
  font: 900 10px/1 var(--mono);
  letter-spacing: .08em;
}
.group-card h3 { margin: 55px 0 8px; font-size: 21px; line-height: 1.25; }
.group-card p { margin: 0; color: var(--muted); font-size: 13px; }
.group-state {
  position: absolute;
  left: 28px;
  bottom: 23px;
  color: #74808c;
  font-size: 10px;
  font-weight: 800;
}
.group-state.open { color: var(--card-accent); }

.focus-band {
  --focus-accent: var(--yellow);
  padding: 72px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #0f171f;
}
.focus-layout { display: grid; grid-template-columns: .85fr 1.4fr; gap: 70px; }
.focus-identity { position: relative; padding-left: 84px; }
.focus-number {
  position: absolute;
  left: 0;
  top: 3px;
  color: var(--focus-accent);
  font: 900 36px/1 var(--mono);
}
.focus-identity .eyebrow { color: var(--focus-accent); }
.focus-identity h2 { margin: 8px 0 15px; font-size: 34px; line-height: 1.12; }
.focus-identity > p:last-child { margin: 0; color: #b5c0ca; }
.focus-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 34px;
  padding-left: 36px;
  border-left: 1px solid var(--line);
}
.mini-label {
  color: var(--focus-accent);
  font: 900 9px/1 var(--mono);
  letter-spacing: .09em;
}
.track-list { margin: 18px 0 0; padding: 0; list-style: none; }
.track-list li { padding: 10px 0; border-bottom: 1px solid var(--line); color: #d2d9df; }
.track-list li::before { content: "→"; margin-right: 9px; color: var(--focus-accent); }
.focus-outcome p { margin: 18px 0 22px; color: #bdc7cf; }
.inline-action {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 15px;
  border: 1px solid var(--focus-accent);
  border-radius: 5px;
  color: var(--focus-accent);
  text-decoration: none;
  font-size: 12px;
  font-weight: 900;
}
.inline-action:hover { color: #0b1118; background: var(--focus-accent); }
.inline-action.disabled { pointer-events: none; opacity: .48; }

.math-band { padding: 88px 0 104px; background: #090d12; }
.math-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.math-heading > div:first-child { max-width: 760px; }
.math-count { display: flex; align-items: flex-end; gap: 10px; flex: 0 0 auto; }
.math-count strong { color: var(--yellow); font: 900 58px/.82 var(--mono); }
.math-count span { color: var(--muted); font-size: 11px; font-weight: 800; }
.course-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
  padding: 27px 0;
}
.course-toolbar > p { max-width: 520px; margin: 0; color: var(--muted); font-size: 13px; text-align: right; }
.segmented { display: inline-flex; padding: 4px; border: 1px solid var(--line); border-radius: 7px; background: #0d141c; }
.segment {
  min-height: 35px;
  padding: 0 14px;
  border: 0;
  border-radius: 4px;
  color: var(--muted);
  background: transparent;
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
}
.segment span { margin-left: 5px; color: #75818c; font: 800 9px var(--mono); }
.segment.active { color: #151007; background: var(--yellow); }
.segment.active span { color: #544115; }
.course-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 13px; }
.course-card {
  min-height: 245px;
  display: flex;
  flex-direction: column;
  padding: 23px 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform .2s, border-color .2s, background .2s;
}
.course-card:hover { transform: translateY(-3px); border-color: #526579; background: var(--panel-strong); }
.course-topline { display: flex; justify-content: space-between; align-items: center; }
.course-number { color: var(--yellow); font: 900 9px/1 var(--mono); }
.course-tag { color: #81909d; font-size: 9px; font-weight: 800; }
.course-card h3 { margin: 31px 0 9px; font-size: 19px; }
.course-card .formula { color: var(--cyan); font: 800 12px/1.35 var(--mono); }
.course-card p { margin: 15px 0 22px; color: var(--muted); font-size: 12px; }
.course-link { margin-top: auto; color: var(--yellow); text-decoration: none; font-size: 11px; font-weight: 900; }
.course-link::after { content: " →"; }

.footer {
  min-height: 110px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 25px clamp(20px, 5vw, 70px);
  border-top: 1px solid var(--line);
  color: #71808d;
  background: #080b0f;
  font-size: 11px;
}
.footer > div { display: flex; align-items: center; gap: 18px; }
.footer strong { color: #d5dde4; }
.footer a { color: #aeb9c3; text-decoration: none; }
.footer a:hover { color: var(--yellow); }

@media (max-width: 900px) {
  .nav-links { gap: 15px; overflow-x: auto; }
  .hero { min-height: 590px; }
  .hero-content { width: min(100% - 36px, 1180px); }
  .section-inner { width: min(100% - 36px, 1180px); }
  .section-heading { grid-template-columns: 1fr; gap: 18px; }
  .group-grid { grid-template-columns: repeat(2, 1fr); }
  .focus-layout { grid-template-columns: 1fr; gap: 38px; }
  .focus-content { padding-left: 0; border-left: 0; }
  .course-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .topnav { min-height: 62px; padding: 0 14px; }
  .brand small { display: none; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 11px; }
  .nav-links .nav-focus,
  .nav-links .nav-company { display: none; }
  .hero {
    min-height: 610px;
    background-position: 61% center;
  }
  .hero-content { width: calc(100% - 30px); padding: 82px 0 36px; }
  .hero h1 { font-size: 55px; }
  .hero-copy { font-size: 14px; line-height: 1.75; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-facts { margin-top: 34px; }
  .hero-facts div { padding: 14px 10px; }
  .section-inner { width: calc(100% - 30px); }
  .group-band, .math-band { padding: 60px 0 70px; }
  .section-heading h2, .math-heading h2 { font-size: 32px; }
  .group-grid { grid-template-columns: 1fr; }
  .group-card { min-height: 210px; }
  .focus-band { padding: 56px 0; }
  .focus-identity { padding-left: 66px; }
  .focus-number { font-size: 28px; }
  .focus-content { grid-template-columns: 1fr; }
  .math-heading { align-items: flex-start; flex-direction: column; }
  .math-count strong { font-size: 48px; }
  .course-toolbar { align-items: stretch; flex-direction: column; }
  .course-toolbar > p { text-align: left; }
  .segmented { width: 100%; }
  .segment { flex: 1; }
  .footer { align-items: flex-start; flex-direction: column; }
  .footer > div { align-items: flex-start; flex-direction: column; gap: 6px; }
}