:root {
  color-scheme: dark;
  --bg: #000;
  --ink: #f5f5f2;
  --muted: #91918e;
  --line: #2b2b29;
  --soft-line: #1a1a19;
  --lime: #c6ff3d;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

.site-header {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  height: 72px;
  align-items: center;
  justify-content: space-between;
  padding: 0 3.1vw;
  border-bottom: 1px solid transparent;
  transition: background .35s ease, border-color .35s ease;
}

.site-header.is-scrolled { background: rgba(0, 0, 0, .9); border-color: var(--soft-line); backdrop-filter: blur(12px); }
.brand { font-size: 17px; font-weight: 700; letter-spacing: -.06em; }
.brand-mark { color: var(--lime); }
nav { display: flex; gap: 30px; margin-left: 10%; }
nav a, .header-cta { color: #bbb; font-size: 13px; transition: color .2s ease; }
nav a:hover, .header-cta:hover { color: var(--ink); }
.header-cta { display: flex; gap: 10px; align-items: center; }
.header-cta span { color: var(--lime); font-size: 16px; }

.hero { position: relative; display: flex; min-height: 100vh; flex-direction: column; justify-content: space-between; padding: 150px 3.1vw 45px; overflow: hidden; }
.eyebrow, .section-index, .about-label { margin: 0; color: var(--muted); font-size: 11px; letter-spacing: .07em; line-height: 1.4; text-transform: uppercase; }
.eyebrow span { color: var(--lime); padding: 0 6px; }
h1, h2, h3, p { margin-top: 0; }
h1 { position: relative; z-index: 1; max-width: 1120px; margin: auto 0 7vh; font-size: clamp(50px, 9.45vw, 150px); font-weight: 600; letter-spacing: -.095em; line-height: .94; }
.hero-bottom { position: relative; z-index: 1; display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.hero-bottom p { margin-bottom: 0; color: #b0b0ad; font-size: clamp(14px, 1.25vw, 18px); letter-spacing: -.025em; line-height: 1.45; }
.hero-bottom .btn-primary { margin-right: auto; }
.hero-bottom .scroll-cue { align-self: end; }
.scroll-cue { color: var(--muted); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; }
.scroll-cue span { display: inline-block; margin-left: 8px; color: var(--lime); animation: bob 1.7s ease-in-out infinite; }
.hero-orbit { position: absolute; right: -18vw; bottom: -27vw; width: 60vw; height: 60vw; border: 1px solid #262624; border-radius: 50%; }
.hero-orbit::before, .hero-orbit::after { position: absolute; border: 1px solid #1c1c1b; border-radius: 50%; content: ""; inset: 13%; }
.hero-orbit::after { inset: 28%; }
.hero-orbit span { position: absolute; top: 11%; left: 9%; width: 6px; height: 6px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 25px 7px rgba(198, 255, 61, .12); }
.hero-orbit i { position: absolute; top: 50%; left: -2px; width: 4px; height: 4px; border-radius: 50%; background: #777; }

.section { padding: 150px 3.1vw; }
.courses { border-top: 1px solid var(--line); }
.section-heading { position: relative; }
.section-heading h2 { max-width: 940px; margin: 26px 0 0; font-size: clamp(40px, 6.1vw, 92px); font-weight: 500; letter-spacing: -.085em; line-height: .98; }
.section-note { position: absolute; right: 0; bottom: 6px; margin: 0; color: var(--muted); font-size: 12px; }
.course-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 90px; }
.course-card { display: flex; min-height: 330px; flex-direction: column; padding: 18px; border: 1px solid var(--line); background: #050505; transition: border-color .25s ease, background .25s ease, transform .25s ease; }
.course-card:hover { border-color: #75756d; background: #0b0b0a; transform: translateY(-4px); }
.card-top { display: flex; justify-content: space-between; color: var(--muted); font-size: 10px; letter-spacing: .07em; }
.course-card h3 { margin: auto 0 12px; font-size: clamp(23px, 2vw, 31px); font-weight: 500; letter-spacing: -.065em; line-height: 1.03; }
.course-card p { min-height: 44px; margin: 0 0 24px; color: #aaa9a6; font-size: 13px; line-height: 1.55; }
.course-card .card-outcome { min-height: 0; margin: 0 0 20px; color: #6f6f6c; font-size: 11.5px; line-height: 1.5; }
.course-card a { display: flex; justify-content: space-between; color: var(--lime); border-top: 1px solid var(--line); padding-top: 13px; font-size: 12px; }

.cases { border-top: 1px solid var(--line); }
.cases-heading h2 { max-width: 1040px; }
.filter-bar { display: flex; gap: 8px; margin: 64px 0 25px; flex-wrap: wrap; }
.filter { cursor: pointer; border: 1px solid var(--line); border-radius: 999px; padding: 8px 11px; background: transparent; color: #a6a6a3; font-size: 12px; transition: color .2s ease, border-color .2s ease, background .2s ease; }
.filter span { margin-left: 5px; color: #656562; font-size: 10px; }
.filter:hover, .filter.is-active { border-color: var(--ink); background: var(--ink); color: #080808; }
.filter.is-active span { color: #5d5d59; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.case-card { position: relative; display: flex; min-height: 245px; flex-direction: column; justify-content: space-between; padding: 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #030303; transition: background .25s ease, opacity .2s ease; }
.case-card:hover { background: #10100f; }
.case-card.is-hidden { display: none; }
.case-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: 10px; letter-spacing: .06em; }
.case-meta .case-tag { color: var(--lime); }
.case-card h3 { max-width: 80%; margin: auto 0 4px; font-size: clamp(20px, 1.8vw, 27px); font-weight: 500; letter-spacing: -.06em; line-height: 1.12; }
.case-card .case-preview { margin: 0 0 30px; color: #757572; font-size: 12px; line-height: 1.5; }
.case-arrow { position: absolute; right: 18px; bottom: 16px; color: var(--lime); font-size: 19px; transition: transform .2s ease; }
.case-card:hover .case-arrow { transform: translate(3px, -3px); }

.about { min-height: 790px; border-top: 1px solid var(--line); display: flex; flex-direction: column; justify-content: space-between; }
.dot { display: inline-block; width: 6px; height: 6px; margin: 0 8px 1px 0; border-radius: 50%; background: var(--lime); }
.manifesto { display: grid; grid-template-columns: minmax(0, 2.4fr) minmax(180px, .7fr); gap: 8vw; align-items: end; }
.manifesto h2 { margin: 0; font-size: clamp(42px, 6.2vw, 96px); font-weight: 500; letter-spacing: -.09em; line-height: .96; }
.manifesto h2 em { font-family: Georgia, "Times New Roman", serif; font-weight: 400; letter-spacing: -.11em; }
.manifesto p { margin: 0 0 8px; color: #a6a6a3; font-size: 14px; line-height: 1.65; }
.manifesto .about-facts { margin-top: 22px; color: #757572; font-size: 12px; line-height: 1.8; }
.btn-primary { display: inline-block; padding: 12px 22px; border: 1px solid var(--ink); border-radius: 999px; background: var(--ink); color: #080808 !important; font-size: 13px; font-weight: 600; transition: opacity .2s ease; }
.btn-primary:hover { opacity: .8; }
.btn-primary span { color: #080808 !important; margin-left: 6px; }
.manifesto-link { align-self: flex-end; min-width: 230px; border-bottom: 1px solid #73736e; padding-bottom: 12px; color: var(--lime); font-size: 13px; }
.manifesto-link span { float: right; font-size: 17px; }

footer { display: grid; grid-template-columns: 1fr 1fr 1fr; padding: 20px 3.1vw 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
footer p { margin: 0; } footer p:nth-child(2) { text-align: center; } footer a { text-align: right; } footer a:hover { color: var(--ink); }

@keyframes bob { 50% { transform: translateY(5px); } }

@media (max-width: 760px) {
  .site-header { height: 60px; padding: 0 16px; }
  nav { display: none; }
  .header-cta { font-size: 12px; }
  .hero { min-height: 710px; padding: 110px 16px 28px; }
  h1 { margin-bottom: 9vh; font-size: clamp(47px, 14vw, 70px); }
  .hero-bottom { align-items: start; flex-direction: column; gap: 37px; }
  .hero-orbit { right: -45vw; bottom: -36vw; width: 105vw; height: 105vw; }
  .section { padding: 90px 16px; }
  .section-heading h2 { margin-top: 20px; font-size: clamp(39px, 12vw, 58px); }
  .section-note { position: static; margin-top: 22px; }
  .course-grid { grid-template-columns: 1fr; gap: 8px; margin-top: 52px; }
  .course-card { min-height: 240px; }
  .course-card h3 { margin-top: 65px; font-size: 29px; }
  .cases-heading h2 { font-size: clamp(38px, 11vw, 56px); }
  .filter-bar { gap: 6px; margin: 48px 0 18px; }
  .case-grid { grid-template-columns: 1fr; }
  .case-card { min-height: 205px; }
  .case-card h3 { max-width: 85%; font-size: 26px; }
  .about { min-height: 660px; }
  .manifesto { display: block; }
  .manifesto h2 { font-size: clamp(40px, 11vw, 57px); }
  .manifesto p { max-width: 310px; margin-top: 40px; font-size: 13px; }
  .manifesto-link { align-self: stretch; min-width: 0; }
  footer { grid-template-columns: 1fr 1fr; gap: 18px 8px; padding: 19px 16px 25px; }
  footer p:nth-child(2) { display: none; }
  footer a { text-align: right; }
}

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