:root {
  --bg: #f3f3f1;
  --paper: #ffffff;
  --ink: #111111;
  --muted: #5c5c5c;
  --line: #e7e7e4;
  --yellow: #ffe14d;
  --yellow-deep: #f3c400;
  --sage: #1f6b4a;
  --sage-soft: #e7f3ec;
  --orange: #ff8a1e;
  --ink-card: #171717;
  --shadow: 0 24px 60px rgba(17, 17, 17, 0.08);
  --radius: 28px;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 50% -80px, #fff 0%, transparent 70%),
    var(--bg);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input { font: inherit; }

.wrap { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; }

.nav-bar {
  position: sticky;
  top: 14px;
  z-index: 20;
  display: flex;
  justify-content: center;
  padding: 0 16px;
}
.nav {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #fff;
  border: 1px solid rgba(0,0,0,.06);
  border-radius: 999px;
  padding: 8px 8px 8px 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.06);
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  letter-spacing: -.02em;
  margin-right: 8px;
  white-space: nowrap;
}
.mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: #111;
  display: grid;
  grid-template-columns: repeat(3, 4px);
  gap: 2px;
  align-items: end;
  justify-content: center;
  padding: 5px 4px 4px;
}
.mark span { display: block; background: #ffe14d; border-radius: 2px; }
.mark span:nth-child(1) { height: 8px; }
.mark span:nth-child(2) { height: 16px; }
.mark span:nth-child(3) { height: 11px; }
.nav a.item {
  padding: 8px 12px;
  border-radius: 999px;
  color: #222;
  font-size: 14px;
}
.nav a.item:hover, .nav a.item.active { background: #f3f3f1; }
.nav .cta {
  background: var(--yellow);
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 700;
  font-size: 14px;
  margin-left: 4px;
}
.nav .cta:hover { background: var(--yellow-deep); }
.menu-btn {
  display: none;
  border: 0;
  background: #111;
  color: #fff;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  cursor: pointer;
}

.hero { text-align: center; padding: 54px 0 18px; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 6px 12px 6px 8px;
  font-size: 13px;
  color: #333;
}
.badge b { font-weight: 700; }
.dot {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--sage-soft); color: var(--sage);
  display: grid; place-items: center; font-size: 12px;
}
h1 {
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: .98;
  letter-spacing: -.045em;
  margin: 22px auto 14px;
  max-width: 980px;
  font-weight: 900;
}
.lead {
  max-width: 640px;
  margin: 0 auto 22px;
  color: #3a3a3a;
  font-size: 18px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--yellow);
  border-radius: 999px;
  padding: 14px 22px;
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(243, 196, 0, .28);
}
.btn:hover { background: var(--yellow-deep); }
.btn.dark { background: #111; color: #fff; box-shadow: none; }
.chrome {
  width: 22px; height: 22px; border-radius: 50%;
  background: conic-gradient(#ea4335 0 25%, #fbbc05 0 50%, #34a853 0 75%, #4285f4 0 100%);
  box-shadow: inset 0 0 0 5px #fff;
}

.stage {
  margin: 36px auto 10px;
  background: #fff;
  border-radius: 36px 36px 28px 28px;
  box-shadow: var(--shadow);
  padding: 18px 18px 22px;
  border: 1px solid rgba(0,0,0,.04);
}
.stage-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px 14px;
  color: #666;
  font-size: 13px;
}
.stage-top strong { color: #111; }
.pills { display: flex; gap: 8px; }
.pills i {
  width: 28px; height: 28px; border-radius: 50%;
  background: #f3f3f1; display: grid; place-items: center; font-style: normal;
}

.mosaic {
  display: grid;
  grid-template-columns: 1.1fr .9fr 1.15fr .95fr;
  grid-auto-rows: 92px;
  gap: 12px;
}
.card {
  border-radius: 18px;
  overflow: hidden;
  padding: 16px;
  position: relative;
  min-height: 0;
}
.card.tall { grid-row: span 2; }
.card.mid { grid-row: span 2; }
.c-green { background: #1e6a49; color: #e9f6ee; }
.c-photo { background: linear-gradient(160deg, #efe6d4, #d7c4a4); }
.c-paper { background: #f7f1df; }
.c-orange { background: radial-gradient(circle at 50% 45%, #111 0 46px, #ff9a1f 47px); color: #fff; }
.c-dark { background: #161616; color: #fff; }
.c-white { background: #f6f6f4; border: 1px solid var(--line); }
.c-line { background: #fbfbfa; border: 1px solid var(--line); }
.card h3 { margin: 0 0 6px; font-size: 16px; letter-spacing: -.02em; }
.card p { margin: 0; font-size: 13px; line-height: 1.55; opacity: .9; }
.kicker { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; opacity: .75; }

.digits { display: flex; gap: 8px; margin-top: 18px; }
.digits b {
  width: 42px; height: 52px; border-radius: 10px;
  background: rgba(255,255,255,.14);
  display: grid; place-items: center;
  font-size: 26px;
}
.bars { display: flex; align-items: end; gap: 8px; height: 92px; margin-top: 12px; }
.bars span {
  width: 18px; border-radius: 8px 8px 4px 4px; background: #ffe14d;
  display: block;
}
.orbit {
  width: 120px; height: 120px; margin: 18px auto 0; border-radius: 50%;
  border: 1px dashed rgba(255,255,255,.35);
  display: grid; place-items: center;
  position: relative;
}
.orbit em {
  position: absolute; font-style: normal; font-size: 12px;
  background: #2a2a2a; border-radius: 999px; padding: 3px 7px;
}
.flow {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 12px; line-height: 1.7; color: #333;
}
.tag {
  display: inline-block; background: #111; color: #fff;
  border-radius: 999px; font-size: 12px; padding: 3px 8px;
}

.section { padding: 64px 0; }
.section h2 {
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -.04em;
  line-height: 1.15;
  margin: 0 0 12px;
}
.sub { color: var(--muted); margin-top: 0; }
.grid-3, .grid-2 { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: 1.15fr .85fr; }
.panel {
  background: #fff;
  border-radius: var(--radius);
  padding: 22px;
  border: 1px solid rgba(0,0,0,.04);
}
.panel h3 { margin: 8px 0; letter-spacing: -.02em; }
.num {
  width: 36px; height: 36px; border-radius: 12px;
  background: var(--yellow); display: grid; place-items: center; font-weight: 800;
}
article.prose p { margin: 0 0 14px; }
article.prose h2 { margin-top: 8px; }
.note {
  background: #fff8d6;
  border-radius: 16px;
  padding: 14px 16px;
  font-size: 14px;
}

.page-hero { padding: 42px 0 10px; }
.crumb { color: #777; font-size: 13px; margin-bottom: 10px; }
.crumb a:hover { text-decoration: underline; }
.page-hero h1 { font-size: clamp(36px, 5vw, 60px); margin: 8px 0 10px; text-align: left; }
.page-hero .lead { margin: 0; text-align: left; max-width: 720px; }

.tool {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  align-items: end;
}
label { display: block; font-size: 13px; color: #555; margin-bottom: 6px; }
input[type="text"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  background: #fafafa;
}
.tool button {
  border: 0; background: #111; color: #fff;
  border-radius: 14px; padding: 12px 16px; cursor: pointer; font-weight: 700;
}
.result { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.result div {
  background: #111; color: #fff; border-radius: 16px; padding: 12px 14px; min-width: 110px;
}
.result strong { display: block; font-size: 28px; letter-spacing: -.04em; }
.result span { font-size: 12px; opacity: .75; }

.faq details {
  background: #fff;
  border-radius: 18px;
  padding: 14px 18px;
  margin-bottom: 10px;
  border: 1px solid rgba(0,0,0,.04);
}
.faq summary { cursor: pointer; font-weight: 700; }
.faq p { margin: 8px 0 4px; color: #333; }

.list { margin: 0; padding-left: 18px; }
.list li { margin: 6px 0; }

.notes {
  padding: 8px 0 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  text-align: left;
}
.notes h2 { grid-column: 1 / -1; text-align: center; margin: 0 0 4px; }
.notes p {
  margin: 0;
  max-width: none;
  background: #fff;
  color: #333;
  border-radius: 24px;
  padding: 22px 20px;
  border: 1px solid rgba(0,0,0,.04);
}
.site-foot { background: #141414; color: #d8d8d8; padding: 42px 0 22px; margin-top: 12px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr .7fr 1fr; gap: 28px; }
.site-foot .brand { color: #fff; }
.site-foot h2 { color: #fff; font-size: 14px; letter-spacing: .08em; margin: 4px 0 12px; }
.site-foot p { margin: 12px 0 0; line-height: 1.7; font-size: 14px; }
.site-foot a { display: block; color: #eee; margin: 6px 0; }
.site-foot a:hover { color: #ffe14d; }
.foot-bar { margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; color: #999; }

.story { display: grid; grid-template-columns: 1.2fr .8fr .9fr; gap: 14px; }
.poster {
  border-radius: 28px;
  padding: 22px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.poster h2, .poster h3 { margin: 0; letter-spacing: -.04em; line-height: 1.1; }
.poster p { margin: 8px 0 0; font-size: 14px; }
.poster.ink { background: #141414; color: #fff; }
.poster.sun { background: var(--yellow); }
.poster.sage { background: #1e6a49; color: #f3fff7; }
.giant { font-size: clamp(54px, 7vw, 92px); font-weight: 900; letter-spacing: -.06em; line-height: .9; }
.chiprow { display: flex; gap: 8px; flex-wrap: wrap; }
.chip { background: rgba(255,255,255,.16); border-radius: 999px; padding: 4px 10px; font-size: 13px; }
.sun .chip { background: rgba(0,0,0,.08); }

.lock {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.dial {
  background: #111;
  color: #fff;
  border-radius: 28px;
  min-height: 240px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.dial b { font-size: 92px; line-height: .85; letter-spacing: -.06em; }
.dial span { opacity: .7; font-size: 14px; }
.vs { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: stretch; }
.vs .or {
  align-self: center;
  width: 54px; height: 54px; border-radius: 50%;
  background: #111; color: #fff; display: grid; place-items: center; font-weight: 800;
}
.sumline { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.ball {
  width: 74px; height: 74px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 32px; font-weight: 900;
  background: #fff; border: 1px solid var(--line);
}
.ball.plus, .ball.eq { width: 42px; height: 42px; font-size: 22px; background: transparent; border: 0; }

.jump {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: center;
}
.numbox {
  background: #111; color: #fff; border-radius: 32px;
  padding: 28px 18px; text-align: center;
}
.numbox strong { font-size: clamp(64px, 8vw, 104px); letter-spacing: .08em; line-height: 1; }
.numbox em { display: block; font-style: normal; opacity: .65; margin-top: 8px; }
.gaps { display: flex; flex-direction: column; gap: 8px; }
.gaps div {
  background: var(--yellow); border-radius: 999px;
  padding: 8px 12px; font-weight: 800; text-align: center;
}
.ruler { display: grid; grid-template-columns: repeat(10, 1fr); gap: 6px; }
.ruler button {
  border: 0; background: #fff; border-radius: 16px; min-height: 92px;
  cursor: pointer; font-weight: 800; font-size: 20px;
  border: 1px solid var(--line);
}
.ruler button.on { background: #111; color: #ffe14d; }
.ruler-note { min-height: 48px; font-weight: 700; }

.ledger { width: 100%; border-collapse: separate; border-spacing: 0 8px; }
.ledger th { text-align: left; font-size: 13px; color: #777; font-weight: 600; padding: 0 12px; }
.ledger td { background: #fff; padding: 14px 12px; font-weight: 800; font-size: 20px; }
.ledger tr { cursor: pointer; }
.ledger td:first-child { border-radius: 16px 0 0 16px; font-size: 14px; font-weight: 600; color: #666; }
.ledger td:last-child { border-radius: 0 16px 16px 0; }
.ledger tr.on td { background: #111; color: #fff; }
.ledger tr.on td:first-child { color: #ffe14d; }
.bars-inline { display: flex; gap: 4px; align-items: end; height: 36px; }
.bars-inline i { display: block; width: 10px; background: #ffe14d; border-radius: 4px 4px 2px 2px; }

.patterns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pat {
  background: #fff; border-radius: 24px; padding: 16px 18px 18px;
  border: 1px solid rgba(0,0,0,.04); cursor: pointer; text-align: left;
}
.pat.on { outline: 2px solid #111; }
.spark { display: flex; gap: 6px; align-items: end; height: 54px; margin-bottom: 8px; }
.spark i { width: 14px; background: #111; border-radius: 5px; display: block; }
.pat h3 { margin: 0; font-size: 18px; }
.pat p { margin: 6px 0 0; color: #444; font-size: 14px; }

.myths { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.myth {
  min-height: 230px; border-radius: 28px; padding: 20px;
  background: #fff; border: 0; text-align: left; cursor: pointer;
  display: flex; flex-direction: column; justify-content: space-between;
  box-shadow: 0 10px 30px rgba(0,0,0,.04);
}
.myth .hear { font-size: 22px; font-weight: 900; letter-spacing: -.03em; line-height: 1.25; }
.myth .real { display: none; font-size: 15px; }
.myth.open { background: #141414; color: #fff; }
.myth.open .hear { display: none; }
.myth.open .real { display: block; }
.stamp {
  align-self: flex-start; font-size: 12px; letter-spacing: .14em;
  border: 1px dashed currentColor; border-radius: 999px; padding: 3px 8px; opacity: .7;
}

.rail { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stop {
  background: #fff; border-radius: 24px; padding: 18px;
  min-height: 210px; display: flex; flex-direction: column; gap: 8px;
  border: 1px solid rgba(0,0,0,.04);
}
.stop em { font-style: normal; font-weight: 800; color: #999; }
.stop strong { font-size: 26px; letter-spacing: -.04em; }
.stop span { color: #444; font-size: 14px; }
.stop:hover { background: #111; color: #fff; }
.stop:hover em { color: #ffe14d; }
.stop:hover span { color: #ddd; }

.quiet-loud { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.quiet-loud article { border-radius: 28px; padding: 22px; min-height: 280px; }
.quiet-loud article:first-child { background: #f7f1df; }
.quiet-loud article:last-child { background: #141414; color: #fff; }
.quiet-loud .giant { font-size: 48px; letter-spacing: -.04em; }
.lesson { padding-top: 12px; }
.lesson h2 { margin-bottom: 18px; }
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.timeline li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.timeline li span {
  width: 44px; height: 44px; border-radius: 50%;
  background: #111; color: #ffe14d;
  display: grid; place-items: center; font-weight: 800;
}
.timeline h3 { margin: 0 0 6px; letter-spacing: -.03em; }
.timeline p { margin: 0; max-width: 720px; color: #333; }
.quiet-loud .bars span { background: #111; }
.quiet-loud article:last-child .bars span { background: #ffe14d; }

.marquee {
  display: flex; gap: 22px; overflow: hidden;
  background: #111; color: #ffe14d; border-radius: 999px;
  padding: 12px 18px; font-weight: 800; letter-spacing: -.02em;
  white-space: nowrap;
}
.endband {
  margin: 10px auto 28px;
  background: var(--yellow);
  border-radius: 32px;
  padding: 28px;
  display: flex; justify-content: space-between; align-items: end; gap: 18px;
}
.endband h2 { margin: 0 0 8px; letter-spacing: -.04em; }
.endband p { margin: 0; max-width: 640px; }

@media (max-width: 900px) {
  .mosaic, .story, .vs, .jump, .patterns, .myths, .rail, .quiet-loud { grid-template-columns: 1fr; }
  .endband { flex-direction: column; align-items: flex-start; }
  .foot-grid, .notes { grid-template-columns: 1fr; }
  .vs .or { justify-self: center; }
  .grid-3, .grid-2, .tool { grid-template-columns: 1fr; }
  .nav a.item { display: none; }
  .nav.open a.item {
    display: block;
  }
  .nav.open {
    flex-wrap: wrap;
    border-radius: 24px;
    width: min(420px, 100%);
  }
  .menu-btn { display: grid; place-items: center; }
}