:root {
  --ink: #121222;
  --paper: #f4f2f7;
  --purple: #7652ff;
  --purple-dark: #4a2fd1;
  --cyan: #26dce8;
  --line: rgba(18, 18, 34, 0.16);
  --muted: #6d6b79;
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; background: var(--paper); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
}

.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 12px; font-weight: 750; letter-spacing: .12em; }
.brand-mark { display: grid; width: 38px; height: 38px; place-items: center; color: #fff; background: var(--ink); font-size: 11px; letter-spacing: .05em; }
.site-header nav { display: flex; align-items: center; gap: clamp(18px, 3vw, 44px); font-size: 13px; }
.site-header nav a { padding: 12px 0; transition: opacity .2s ease; }
.site-header nav a:hover { opacity: .55; }
.site-header .header-download { padding: 12px 18px; color: #fff; background: var(--purple); }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(340px, .84fr) minmax(520px, 1.16fr);
  align-items: center;
  gap: clamp(44px, 6vw, 110px);
  min-height: calc(100vh - 82px);
  padding: clamp(78px, 9vw, 138px) 4vw clamp(86px, 10vw, 150px);
  background:
    radial-gradient(circle at 82% 26%, rgba(38, 220, 232, .16), transparent 25%),
    linear-gradient(120deg, #f4f2f7 0 49%, #e8e3f4 49% 100%);
}
.hero::after { content: "Y"; position: absolute; right: 2vw; bottom: -10vw; color: rgba(118, 82, 255, .065); font-size: min(47vw, 720px); font-weight: 900; line-height: 1; pointer-events: none; }
.hero-copy, .hero-product { position: relative; z-index: 1; }
.kicker { margin: 0 0 24px; color: var(--purple-dark); font-size: 11px; font-weight: 800; letter-spacing: .22em; }
h1, h2, h3, h4, p { margin-top: 0; }
.hero h1 { margin-bottom: 30px; font-size: clamp(54px, 6.3vw, 112px); font-weight: 780; letter-spacing: -.075em; line-height: .98; }
.hero h1 em { color: var(--purple); font-family: Georgia, "Songti SC", serif; font-weight: 500; }
.lead { max-width: 620px; margin-bottom: 36px; color: #474551; font-size: clamp(16px, 1.25vw, 20px); line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.button { display: inline-flex; min-height: 56px; align-items: center; justify-content: space-between; gap: 28px; padding: 0 22px; border: 1px solid var(--ink); font-size: 13px; font-weight: 750; transition: transform .2s ease, box-shadow .2s ease; }
.button:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(18, 18, 34, .13); }
.button-primary { color: #fff; border-color: var(--purple); background: var(--purple); }
.button-secondary { background: rgba(244, 242, 247, .7); }
.hero-note { margin: 18px 0 0; color: var(--muted); font-size: 11px; line-height: 1.6; }
.hero-product { padding: 42px 0 0 34px; }
.app-icon { position: absolute; z-index: 2; top: -35px; left: -10px; width: clamp(82px, 8vw, 128px); height: auto; border-radius: 24%; filter: drop-shadow(0 22px 26px rgba(18, 18, 34, .28)); transform: rotate(-7deg); }
.window-frame { margin: 0; overflow: hidden; border: 1px solid rgba(18, 18, 34, .22); border-radius: 13px; background: #fff; box-shadow: 0 36px 90px rgba(28, 21, 68, .25); transform: rotate(1.5deg); }
.window-bar { display: flex; height: 38px; align-items: center; gap: 6px; padding: 0 12px; color: #787481; border-bottom: 1px solid #e8e5ec; background: #f5f3f7; font-size: 9px; letter-spacing: .08em; }
.window-bar i { width: 7px; height: 7px; border-radius: 50%; background: #bbb7c2; }
.window-bar span { margin-left: 8px; }

.signal-strip { display: grid; grid-template-columns: repeat(3, 1fr); color: #fff; background: var(--ink); }
.signal-strip div { display: flex; min-height: 122px; align-items: center; gap: 22px; padding: 0 4vw; border-right: 1px solid rgba(255,255,255,.14); }
.signal-strip span { color: var(--cyan); font: 700 11px/1 monospace; }
.signal-strip strong { font-size: 15px; font-weight: 600; }

.section-grid { display: grid; grid-template-columns: minmax(120px, .5fr) minmax(380px, 1.4fr) minmax(280px, .9fr); gap: clamp(30px, 5vw, 90px); padding: clamp(100px, 12vw, 190px) 4vw; }
.section-label { padding-top: 10px; color: var(--muted); font: 700 11px/1.4 monospace; letter-spacing: .12em; }
.manifesto { align-items: start; }
.manifesto h2, .experience h2, .capabilities h2, .architecture h2, .boundary h2, .download-section h2 { margin-bottom: 30px; font-size: clamp(42px, 5.2vw, 84px); letter-spacing: -.065em; line-height: 1.04; }
.manifesto-copy > p:last-child { max-width: 680px; color: #575462; font-size: 18px; line-height: 2; }
.principle-card { min-height: 330px; padding: 34px; color: #fff; background: var(--purple); box-shadow: 22px 22px 0 var(--cyan); }
.principle-card > span { display: block; margin-bottom: 80px; color: #dcd4ff; font: 700 11px/1 monospace; letter-spacing: .2em; }
.principle-card strong { display: block; margin-bottom: 24px; font-size: clamp(25px, 2.2vw, 38px); line-height: 1.25; }
.principle-card p { color: rgba(255,255,255,.76); font-size: 13px; line-height: 1.7; }

.experience { padding-bottom: clamp(100px, 12vw, 190px); background: #e8e3f4; }
.experience-heading { grid-template-columns: minmax(120px, .5fr) minmax(580px, 2.3fr); padding-bottom: 70px; }
.experience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 0 4vw; border: 1px solid rgba(18,18,34,.16); background: rgba(18,18,34,.16); }
.experience-card { position: relative; display: flex; min-width: 0; min-height: 590px; flex-direction: column; justify-content: space-between; padding: 38px; overflow: hidden; background: var(--paper); }
.card-number { position: absolute; top: 22px; right: 24px; color: var(--muted); font: 700 10px/1 monospace; }
.file-tree { margin: 70px 0 40px; padding: 18px; color: #d9d4e1; border-radius: 10px; background: #161524; font: 12px/1.6 monospace; box-shadow: 0 24px 45px rgba(18,18,34,.18); }
.folder-row, .file-row { padding: 7px 9px; }
.folder-row b { color: var(--purple); }
.file-row { padding-left: 30px; color: #8d8998; }
.file-row.active { color: #fff; border-left: 2px solid var(--cyan); background: rgba(118,82,255,.32); }
.folder-row.nested { padding-left: 27px; }.file-row.deep { padding-left: 54px; }
.reading-sample { margin: 70px 0 40px; padding: 28px; color: #3d3946; border: 1px solid #ded9e5; background: #fff; box-shadow: 0 24px 45px rgba(18,18,34,.11); }
.reading-sample small { color: var(--purple); font: 700 9px/1 monospace; letter-spacing: .12em; }
.reading-sample h4 { margin: 28px 0 14px; font-size: 22px; }
.reading-sample p { color: #6b6873; font-size: 12px; line-height: 1.8; }
.reading-sample pre { margin: 22px 0 0; padding: 14px; overflow: auto; color: #d4cbff; background: var(--ink); font-size: 11px; line-height: 1.6; }
.graph { width: 100%; margin: 78px 0 20px; overflow: visible; }
.edges path { fill: none; stroke: rgba(18,18,34,.28); stroke-width: 1.5; }
.nodes circle { fill: var(--paper); stroke: var(--purple); stroke-width: 3; }
.nodes circle:first-child { fill: var(--purple); }
.graph text { fill: #fff; font: 800 16px sans-serif; text-anchor: middle; }
.card-copy > span { color: var(--purple-dark); font: 700 10px/1 monospace; letter-spacing: .16em; }
.card-copy h3 { margin: 16px 0 12px; font-size: clamp(24px, 2vw, 34px); letter-spacing: -.04em; }
.card-copy p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }

.capabilities { padding: clamp(110px, 13vw, 200px) 4vw; color: #fff; background: var(--ink); }
.capabilities-heading { grid-template-columns: minmax(120px, .5fr) minmax(580px, 2.3fr); padding: 0 0 75px; }
.capabilities .section-label { color: #9893a4; }
.capability-list { border-top: 1px solid rgba(255,255,255,.2); }
.capability-list article { display: grid; grid-template-columns: 100px .75fr 1.25fr; align-items: baseline; gap: 20px; padding: 36px 0; border-bottom: 1px solid rgba(255,255,255,.2); }
.capability-list span { color: var(--cyan); font: 700 11px/1 monospace; }
.capability-list h3 { margin: 0; font-size: clamp(25px, 2.6vw, 42px); }
.capability-list p { margin: 0; color: #aaa6b3; line-height: 1.7; }

.architecture { padding-bottom: clamp(100px, 12vw, 190px); }
.architecture-heading { grid-template-columns: minmax(120px, .5fr) minmax(580px, 2.3fr); padding-bottom: 65px; }
.architecture dl { margin: 0 4vw; border-top: 1px solid var(--line); }
.architecture dl div { display: grid; grid-template-columns: .55fr 1fr 1.2fr; gap: 25px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.architecture dt { color: var(--purple-dark); font: 700 11px/1.5 monospace; text-transform: uppercase; }
.architecture dd { margin: 0; font-size: clamp(22px, 2.4vw, 38px); font-weight: 700; letter-spacing: -.04em; }
.architecture dl span { color: var(--muted); font-size: 14px; line-height: 1.7; }

.boundary { align-items: start; border-top: 1px solid var(--line); }
.boundary-list { border-top: 1px solid var(--line); }
.boundary-list div { padding: 21px 0; border-bottom: 1px solid var(--line); }
.boundary-list span { color: var(--purple-dark); font: 700 10px/1 monospace; letter-spacing: .14em; }
.boundary-list p { margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.download-section { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(40px, 8vw, 130px); padding: clamp(100px, 12vw, 180px) 4vw 70px; color: #fff; background: var(--purple); }
.download-copy > p:last-child { max-width: 650px; color: rgba(255,255,255,.76); font-size: 16px; line-height: 1.9; }
.download-section .kicker { color: var(--cyan); }
.download-card { display: grid; grid-template-columns: 84px 1fr; gap: 22px; align-content: start; padding: clamp(26px, 3vw, 46px); color: var(--ink); background: #fff; box-shadow: 22px 22px 0 var(--cyan); }
.download-card img { width: 84px; border-radius: 22%; }
.file-meta { align-self: center; }
.file-meta span { color: var(--purple-dark); font: 700 10px/1 monospace; letter-spacing: .12em; }
.file-meta strong { display: block; margin: 10px 0 7px; font-size: 21px; }
.file-meta p { margin: 0; color: var(--muted); font-size: 12px; }
.download-card > a { display: flex; grid-column: 1 / -1; min-height: 62px; align-items: center; justify-content: space-between; margin-top: 12px; padding: 0 20px; color: #fff; background: var(--ink); font-weight: 750; }
.hash-row { display: grid; grid-column: 1 / -1; grid-template-columns: 100px 1fr; gap: 20px; align-items: start; margin-top: 32px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.3); }
.hash-row span { color: var(--cyan); font: 700 10px/1.5 monospace; }
.hash-row code { overflow-wrap: anywhere; color: rgba(255,255,255,.76); font-size: 11px; line-height: 1.6; }

footer { display: flex; min-height: 120px; align-items: center; justify-content: space-between; gap: 30px; padding: 0 4vw; color: #aaa6b3; background: var(--ink); font-size: 11px; }
footer .brand { color: #fff; } footer .brand-mark { color: var(--ink); background: var(--cyan); }
footer > a:last-child { color: #fff; }
a:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 90px; background: linear-gradient(150deg, #f4f2f7 0 58%, #e8e3f4 58%); }
  .hero-copy { max-width: 760px; }
  .hero-product { width: min(92%, 760px); justify-self: end; }
  .section-grid, .experience-heading, .capabilities-heading, .architecture-heading { grid-template-columns: 130px 1fr; }
  .section-grid > :nth-child(3) { grid-column: 2; }
  .experience-grid { grid-template-columns: 1fr; }
  .experience-card { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: end; min-height: 440px; }
  .file-tree, .reading-sample, .graph { margin-bottom: 0; }
  .download-section { gap: 50px; }
}

@media (max-width: 680px) {
  .site-header { min-height: 66px; }
  .site-header nav a:not(.header-download) { display: none; }
  .site-header .header-download { padding: 10px 13px; }
  .brand { font-size: 10px; letter-spacing: .08em; }
  .brand-mark { width: 34px; height: 34px; }
  .hero { padding: 72px 5vw 84px; }
  .hero h1 { font-size: clamp(42px, 12vw, 60px); line-height: 1.04; }
  .lead { font-size: 15px; }
  .button { width: 100%; }
  .hero-product { width: 96%; margin-top: 22px; padding-left: 10px; }
  .app-icon { top: -20px; left: -4px; width: 76px; }
  .window-frame { border-radius: 8px; }
  .signal-strip { grid-template-columns: 1fr; }
  .signal-strip div { min-height: 74px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.14); }
  .section-grid, .experience-heading, .capabilities-heading, .architecture-heading { grid-template-columns: 1fr; padding-right: 5vw; padding-left: 5vw; }
  .section-grid > :nth-child(3) { grid-column: auto; }
  .manifesto h2, .experience h2, .capabilities h2, .architecture h2, .boundary h2, .download-section h2 { font-size: clamp(38px, 11vw, 58px); }
  .principle-card { min-height: 280px; box-shadow: 12px 12px 0 var(--cyan); }
  .experience-grid { margin: 0 5vw; }
  .experience-card { display: flex; min-height: 560px; padding: 28px; }
  .capabilities { padding-right: 5vw; padding-left: 5vw; }
  .capability-list article { grid-template-columns: 42px 1fr; }
  .capability-list p { grid-column: 2; }
  .architecture dl { margin: 0 5vw; }
  .architecture dl div { grid-template-columns: 1fr; gap: 10px; }
  .download-section { grid-template-columns: 1fr; padding-right: 5vw; padding-left: 5vw; }
  .download-card { grid-template-columns: 64px 1fr; box-shadow: 12px 12px 0 var(--cyan); }
  .download-card img { width: 64px; }
  .hash-row { grid-template-columns: 1fr; }
  footer { flex-direction: column; align-items: flex-start; justify-content: center; padding: 36px 5vw; }
}

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