:root {
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --bg-dark: #0a0a0a;
  --surface-dark: #161616;
  --input-dark: #0c0c0c;

  --ink: #0a0a0a;
  --text: #1b1b1b;
  --muted: #5c5c5c;
  --soft: #8a8a8a;
  --faint: #b4b4b4;

  --line: #ededed;
  --line-strong: #e2e2e2;
  --d-line: rgba(255, 255, 255, 0.10);
  --d-line-strong: rgba(255, 255, 255, 0.16);
  --d-text: rgba(255, 255, 255, 0.92);
  --d-muted: rgba(255, 255, 255, 0.56);
  --d-soft: rgba(255, 255, 255, 0.40);

  --accent: #6c52e9;
  --accent-ink: #5a3fe0;
  --accent-soft: #f0ecfd;
  --accent-line: #ddd3fb;

  --shadow-window: 0 1px 2px rgba(15, 15, 20, 0.05), 0 18px 44px rgba(15, 15, 20, 0.07);
  --shadow-pop: 0 10px 34px rgba(15, 15, 20, 0.14);
  --shadow-card: 0 1px 2px rgba(15, 15, 20, 0.04);

  --r-xs: 4px;
  --r-sm: 7px;
  --r-md: 10px;
  --r-lg: 14px;

  --container: 1180px;
  --pad: 28px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
h1, h2, h3 { margin: 0; }

.page-shell { position: relative; isolation: isolate; }
.section-inner {
  width: min(var(--container), calc(100vw - 48px));
  margin: 0 auto;
}

/* ---------- Typography primitives ---------- */
.eyebrow {
  margin: 0 0 22px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--soft);
}
.section-head { max-width: 720px; }
.section-head.center { margin: 0 auto; text-align: center; }
.section-title {
  font-size: clamp(30px, 4.4vw, 50px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.section-copy {
  margin: 20px 0 0;
  max-width: 600px;
  color: var(--muted);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.65;
}
.section-head.center .section-copy { margin-left: auto; margin-right: auto; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px) saturate(1.1);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, background 200ms ease;
}
.nav.is-scrolled { border-bottom-color: var(--line); }
.nav-inner {
  width: min(var(--container), calc(100vw - 48px));
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { width: 26px; height: 26px; border-radius: 7px; }
.brand-name { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.nav-links { display: flex; align-items: center; gap: 34px; font-size: 14px; color: var(--muted); }
.nav-links a { transition: color 150ms ease; }
.nav-links a:hover { color: var(--ink); }
.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: #fff;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
}
.nav-toggle span { width: 16px; height: 1.5px; background: var(--ink); border-radius: 2px; }

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 22px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 150ms ease, background 150ms ease, box-shadow 150ms ease, border-color 150ms ease, color 150ms ease;
}
.button-primary { background: var(--ink); color: #fff; }
.button-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-pop); }
.button-ghost { color: var(--muted); padding: 0 6px; }
.button-ghost:hover { color: var(--ink); }
.button-ghost span { transition: transform 150ms ease; }
.button-ghost:hover span { transform: translateX(3px); }
.button-outline { background: #fff; color: var(--ink); border-color: var(--line-strong); }
.button-outline:hover { border-color: var(--ink); transform: translateY(-1px); }

/* ---------- Section rhythm ---------- */
.section { padding: 92px 0; }
.section.tight { padding-top: 40px; }
.divider { height: 1px; background: var(--line); border: 0; }

/* ---------- Window chrome (shared) ---------- */
.window {
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: #fff;
  box-shadow: var(--shadow-window);
  overflow: hidden;
}
.chrome {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.chrome i { width: 9px; height: 9px; border-radius: 50%; background: #e0e0e0; }
.chrome .chrome-tab {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  color: var(--soft);
}
.chrome .chrome-label {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* placeholder text lines */
.lines { display: grid; gap: 11px; }
.lines i { display: block; height: 9px; border-radius: 3px; background: #efefef; }

/* ---------- Hero ---------- */
.hero { padding: 86px 0 64px; }
.hero h1 {
  margin: 0;
  font-size: clamp(34px, 8.5vw, 76px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
  overflow-wrap: break-word;
}
.hero-lead {
  margin: 26px 0 0;
  max-width: 540px;
  color: var(--muted);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.6;
}
.hero-actions { display: flex; align-items: center; gap: 18px; margin-top: 34px; flex-wrap: wrap; }
.hero-mockup { margin-top: 64px; }

/* App window mockup (hero) */
.app-window .app-body { display: grid; grid-template-columns: 264px 1fr; min-height: 420px; }
.app-sidebar { padding: 18px; border-right: 1px solid var(--line); background: var(--bg-soft); }
.side-label {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--soft); margin-bottom: 16px;
}
.side-note {
  display: flex; flex-direction: column; gap: 3px;
  padding: 11px 13px; border-radius: var(--r-sm); margin-bottom: 4px;
}
.side-note strong { font-size: 14px; font-weight: 600; color: var(--text); }
.side-note span { font-size: 12px; color: var(--soft); }
.side-note.active { background: #fff; box-shadow: var(--shadow-card); border: 1px solid var(--line); }
.app-doc { padding: 34px 38px; }
.doc-crumb { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--soft); }
.doc-title { margin: 16px 0 26px; font-size: clamp(26px, 3vw, 38px); font-weight: 700; letter-spacing: -0.025em; color: var(--ink); }
.app-doc .lines i:nth-child(1) { width: 94%; }
.app-doc .lines i:nth-child(2) { width: 88%; }
.app-doc .lines i:nth-child(3) { width: 96%; }
.app-doc .lines i:nth-child(4) { width: 82%; }
.app-doc .lines i:nth-child(5) { width: 90%; }
.app-doc .lines i:nth-child(6) { width: 74%; }

/* ---------- Hairline column grid (pillars) ---------- */
.col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  margin-top: 44px;
}
.col-item { padding: 36px 32px 8px; border-left: 1px solid var(--line); }
.col-item:first-child { border-left: 0; padding-left: 0; }
.col-icon {
  width: 34px; height: 34px; margin-bottom: 22px;
  display: grid; place-items: center;
  color: var(--ink);
}
.col-icon svg { width: 26px; height: 26px; }
.col-item h3 { font-size: 20px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.col-item p { margin: 12px 0 0; color: var(--muted); line-height: 1.65; font-size: 15px; }

/* ---------- AI 2x2 grid ---------- */
.tag {
  display: inline-flex; align-items: center;
  height: 28px; padding: 0 14px; margin-bottom: 22px;
  border: 1px solid var(--line-strong); border-radius: 999px;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--soft);
}
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  margin-top: 44px;
}
.ai-cell { padding: 36px 0; }
.ai-cell:nth-child(2n) { padding-left: 40px; border-left: 1px solid var(--line); }
.ai-cell:nth-child(2n+1) { padding-right: 40px; }
.ai-cell:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
.ai-cell h3 { font-size: 20px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.ai-cell p { margin: 12px 0 0; color: var(--muted); line-height: 1.65; font-size: 15px; }

/* ---------- Split layout (editor / tasks / insert / edit) ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1.12fr;
  gap: 56px;
  align-items: center;
}
.split.reverse .split-media { order: -1; }
.split-copy { max-width: 480px; }

/* feature list with em-dash */
.feature-list { margin-top: 30px; display: grid; }
.feature-item {
  display: flex; align-items: baseline; gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.feature-item:last-child { border-bottom: 1px solid var(--line); }
.feature-icon { color: var(--ink); flex: none; transform: translateY(2px); }
.feature-icon svg { width: 17px; height: 17px; }
.feature-item b { font-weight: 600; color: var(--ink); white-space: nowrap; }
.feature-item em { font-style: normal; color: var(--faint); }
.feature-item p { margin: 0; color: var(--muted); font-size: 15px; }

/* numbered feature rows (insert / edit) */
.num-list { margin-top: 30px; display: grid; }
.num-item {
  display: grid; grid-template-columns: 30px 1fr; gap: 16px;
  padding: 20px 0; border-top: 1px solid var(--line);
}
.num-item:last-child { border-bottom: 1px solid var(--line); }
.num-item span { font-size: 13px; color: var(--faint); font-variant-numeric: tabular-nums; padding-top: 2px; }
.num-item h3 { font-size: 17px; font-weight: 600; color: var(--ink); }
.num-item p { margin: 7px 0 0; color: var(--muted); font-size: 15px; line-height: 1.6; }

/* ---------- Editor window (section: editor) ---------- */
.editor-tabs { display: flex; gap: 6px; padding: 12px 14px 0; flex-wrap: wrap; }
.editor-tabs span {
  padding: 8px 14px; border-radius: var(--r-sm) var(--r-sm) 0 0;
  font-size: 13px; color: var(--soft);
}
.editor-tabs .active { background: var(--bg-soft); color: var(--ink); font-weight: 500; }
.editor-tabs .plus { color: var(--faint); }
.editor-doc { padding: 26px 28px 0; border-top: 1px solid var(--line); }
.doc-meta { font-size: 12px; letter-spacing: 0.08em; color: var(--soft); }
.doc-byline { margin: 8px 0 22px; font-size: 13px; color: var(--soft); }
.doc-byline b { color: var(--muted); font-weight: 600; }
.editor-doc .doc-title { margin: 12px 0 6px; }
.doc-image {
  margin: 22px 0; height: 120px; border-radius: var(--r-md);
  background: var(--bg-soft); border: 1px solid var(--line);
  display: grid; place-items: center; color: var(--faint);
}
.editor-toolbar {
  display: flex; align-items: center; gap: 18px;
  padding: 14px 24px; margin-top: 8px;
  border-top: 1px solid var(--line); color: var(--soft);
}
.editor-toolbar svg { width: 16px; height: 16px; }

/* ---------- Dark tasks section ---------- */
.dark { background: var(--bg-dark); color: var(--d-text); }
.dark .eyebrow { color: var(--d-soft); }
.dark .section-title { color: #fff; }
.dark .section-copy { color: var(--d-muted); }

.task-rows { margin-top: 32px; display: grid; }
.task-row {
  display: grid; grid-template-columns: 120px 1fr; gap: 20px; align-items: baseline;
  padding: 18px 0; border-top: 1px solid var(--d-line);
}
.task-row:last-child { border-bottom: 1px solid var(--d-line); }
.task-row b { font-weight: 600; color: #fff; }
.task-row p { margin: 0; color: var(--d-muted); font-size: 15px; }

.task-panel {
  background: var(--surface-dark);
  border: 1px solid var(--d-line);
  border-radius: var(--r-lg);
}
.task-panel .chrome { border-bottom-color: var(--d-line); }
.task-panel .chrome i { background: rgba(255,255,255,0.18); }
.task-panel .chrome .chrome-label { color: var(--d-soft); }
.task-form { padding: 22px; }
.field { margin-bottom: 18px; }
.field > label {
  display: block; margin-bottom: 9px;
  font-size: 12px; color: var(--d-soft);
}
.field .control {
  min-height: 50px; padding: 14px 16px;
  background: var(--input-dark);
  border: 1px solid var(--d-line);
  border-radius: var(--r-md);
  color: var(--d-text); font-size: 15px;
  display: flex; align-items: center; justify-content: space-between;
}
.field .control.area { min-height: 96px; align-items: flex-start; line-height: 1.6; color: var(--d-muted); }
.field .control .caret { color: var(--d-soft); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.toggle-list { margin-top: 22px; display: grid; gap: 16px; }
.toggle-row { display: flex; align-items: center; justify-content: space-between; color: var(--d-text); font-size: 15px; }
.switch { width: 42px; height: 24px; border-radius: 999px; background: rgba(255,255,255,0.16); position: relative; flex: none; }
.switch::after {
  content: ""; position: absolute; top: 3px; left: 3px;
  width: 18px; height: 18px; border-radius: 50%; background: #fff;
  transition: transform 180ms ease;
}
.switch.on { background: #fff; }
.switch.on::after { transform: translateX(18px); background: var(--bg-dark); }

/* ---------- Memory intro (centered) ---------- */
.memory-intro { padding-bottom: 24px; }

/* ---------- Step badge ---------- */
.step-badge {
  display: inline-flex; align-items: center; gap: 9px;
  height: 30px; padding: 0 13px 0 11px;
  border: 1px solid var(--line-strong); border-radius: 999px;
  font-size: 13px; color: var(--ink); margin-bottom: 22px;
}
.step-badge i { font-style: normal; color: var(--accent); font-weight: 700; }

/* ---------- Magic insert mockup ---------- */
.mock-note { padding: 26px 28px; min-height: 360px; position: relative; }
.mock-note .doc-meta { margin-bottom: 22px; }
.mock-note .doc-title { margin: 0 0 8px; }
.insert-line { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; color: var(--text); font-size: 15px; margin-top: 6px; }
.insert-pill {
  display: inline-flex; align-items: center;
  padding: 4px 10px; border-radius: var(--r-xs);
  background: var(--accent-soft); color: var(--accent-ink);
  font-size: 13px; font-weight: 500;
}
.caret-bar { display: inline-block; width: 2px; height: 18px; background: var(--ink); animation: blink 1.1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.insert-pop {
  margin-top: 26px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: #fff;
  box-shadow: var(--shadow-pop);
  overflow: hidden;
}
.insert-opt {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 16px; border-bottom: 1px solid var(--line);
  font-size: 14px; color: var(--text);
}
.insert-opt .opt-key { display: inline-flex; align-items: center; gap: 9px; }
.insert-opt svg { width: 16px; height: 16px; color: var(--soft); }
.opt-badge { font-size: 12px; color: var(--accent-ink); background: var(--accent-soft); padding: 3px 8px; border-radius: var(--r-xs); }
.insert-input { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 12px 12px 16px; }
.insert-input span { color: var(--faint); font-size: 14px; }
.send-btn {
  width: 34px; height: 34px; border-radius: var(--r-sm);
  background: var(--ink); color: #fff;
  display: grid; place-items: center; flex: none;
}
.send-btn svg { width: 16px; height: 16px; }

/* ---------- Magic edit mockup ---------- */
.edit-highlight {
  display: inline; background: var(--accent-soft);
  box-shadow: 0 0 0 2px var(--accent-soft); border-radius: 2px;
  color: var(--text); font-size: 15px;
}
.edit-toolbar {
  margin-top: 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: #fff;
  box-shadow: var(--shadow-pop);
  padding: 6px;
}
.edit-toolbar-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px; color: var(--ink);
}
.edit-toolbar-row svg { width: 17px; height: 17px; }
.edit-toolbar-row + .edit-toolbar-row { border-top: 1px solid var(--line); }
.skill-label {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 12px 8px; font-size: 12px; color: var(--soft);
  border-top: 1px solid var(--line);
}
.skill-label svg { width: 14px; height: 14px; color: var(--accent); }
.skill-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 0 8px 8px; }
.skill-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 14px; border: 1px solid var(--line); border-radius: var(--r-sm);
  font-size: 14px; color: var(--text); background: #fff;
}
.skill-btn svg { width: 15px; height: 15px; color: var(--soft); }
.skill-primary {
  margin: 0 8px 8px; padding: 12px; border-radius: var(--r-sm);
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 14px; font-weight: 500;
}
.skill-primary svg { width: 15px; height: 15px; }

/* ---------- Cross-note diagram ---------- */
.crossnote { margin-top: 48px; }
.diagram {
  display: grid;
  grid-template-columns: 1fr auto 0.78fr auto 1fr;
  gap: 22px; align-items: stretch;
}
.dia-panel {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-soft);
  padding: 22px;
}
.dia-label { font-size: 12px; letter-spacing: 0.04em; color: var(--soft); margin-bottom: 18px; }
.dia-notes { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.dia-card {
  border: 1px solid var(--line); border-radius: var(--r-md); background: #fff;
  padding: 14px 15px;
}
.dia-card b { display: block; font-size: 15px; font-weight: 600; color: var(--ink); }
.dia-card span { display: block; margin-top: 5px; font-size: 12px; color: var(--soft); }
.dia-arrow { display: grid; place-items: center; gap: 7px; color: var(--faint); }
.dia-arrow svg { width: 26px; height: 14px; }
.dia-arrow span { font-size: 12px; color: var(--soft); }
.dia-ai {
  background: var(--bg-dark); border: 0; color: #fff;
  display: grid; place-items: center; align-content: center; gap: 14px;
  text-align: center;
}
.dia-ai .dia-ai-mark {
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center; color: #fff;
}
.dia-ai .dia-ai-mark svg { width: 30px; height: 30px; }
.dia-ai strong { font-size: 30px; font-weight: 700; letter-spacing: 0.02em; }
.dia-ai span { font-size: 12px; letter-spacing: 0.04em; color: var(--d-soft); }
.dia-out { display: flex; flex-direction: column; }
.dia-out-card {
  margin-top: auto; border: 1px solid var(--line); border-radius: var(--r-md);
  background: #fff; padding: 16px;
}
.dia-out-card b { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 14px; }
.dia-out-card .lines i { background: var(--accent-soft); }
.dia-out-card .lines i:nth-child(1) { width: 90%; }
.dia-out-card .lines i:nth-child(2) { width: 96%; }
.dia-out-card .lines i:nth-child(3) { width: 70%; }

/* ---------- Download ---------- */
.platform-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  margin-top: 44px;
}
.platform {
  padding: 28px 26px; border-left: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 18px; min-height: 188px;
  transition: background 160ms ease;
}
.platform:first-child { border-left: 0; }
.platform:hover { background: var(--bg-soft); }
.platform .p-icon { color: var(--ink); }
.platform .p-icon svg { width: 26px; height: 26px; }
.platform .p-kind { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--soft); }
.platform .p-main { margin-top: auto; display: flex; align-items: flex-end; justify-content: space-between; gap: 10px; }
.platform .p-name { font-size: 21px; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.platform .p-sub { margin-top: 5px; font-size: 13px; color: var(--soft); }
.platform .p-dl { color: var(--faint); }
.platform .p-dl svg { width: 18px; height: 18px; }

.china-card {
  margin-top: 18px; padding: 22px 24px;
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--bg-soft);
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.china-card .cc-kind { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--soft); }
.china-card .cc-head { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.china-card .cc-name { font-size: 18px; font-weight: 600; color: var(--ink); }
.china-card .cc-tag { font-size: 12px; color: var(--muted); border: 1px solid var(--line-strong); border-radius: 999px; padding: 3px 10px; }
.china-card p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 56px 0 36px; }
.footer-inner { display: grid; grid-template-columns: 300px 1fr; gap: 40px; }
.footer-brand strong { font-size: 18px; font-weight: 600; color: var(--ink); }
.footer-brand p { margin: 12px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.footer-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.footer-cols h3 { font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--soft); margin-bottom: 16px; font-weight: 600; }
.footer-cols a { display: block; margin-top: 11px; color: var(--muted); font-size: 14px; transition: color 150ms ease; }
.footer-cols a:hover { color: var(--ink); }
.footer-bottom {
  width: min(var(--container), calc(100vw - 48px));
  margin: 44px auto 0; padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  color: var(--soft); font-size: 13px;
}
.footer-status { display: flex; gap: 18px; flex-wrap: wrap; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 600ms ease, transform 600ms ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .caret-bar { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .split { grid-template-columns: 1fr; gap: 40px; }
  .split.reverse .split-media { order: 0; }
  .split-copy { max-width: none; }
  .diagram { grid-template-columns: 1fr; gap: 16px; }
  .dia-arrow { transform: rotate(90deg); padding: 4px 0; }
}
@media (max-width: 860px) {
  .nav-links {
    position: absolute; top: 64px; left: 24px; right: 24px;
    display: none; flex-direction: column; align-items: flex-start; gap: 4px;
    padding: 12px; border: 1px solid var(--line); border-radius: var(--r-md);
    background: #fff; box-shadow: var(--shadow-pop);
  }
  .nav-links a { width: 100%; padding: 10px 8px; }
  .nav-links.is-open { display: flex; }
  .nav-toggle { display: flex; }
  .section { padding: 68px 0; }
  .hero { padding-top: 56px; }
  .col-grid { grid-template-columns: 1fr; border-top: 0; }
  .col-item { border-left: 0; border-top: 1px solid var(--line); padding: 30px 0 8px; }
  .col-item:first-child { border-top: 0; }
  .ai-grid { grid-template-columns: 1fr; }
  .ai-cell { padding: 28px 0 !important; border-left: 0 !important; border-bottom: 1px solid var(--line); }
  .ai-cell:last-child { border-bottom: 0; }
  .platform-grid { grid-template-columns: 1fr 1fr; }
  .platform:nth-child(3), .platform:nth-child(4) { border-top: 1px solid var(--line); }
  .platform:nth-child(odd) { border-left: 0; }
  .app-window .app-body { grid-template-columns: 1fr; }
  .app-sidebar { border-right: 0; border-bottom: 1px solid var(--line); }
  .app-doc { padding: 26px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .section-inner, .nav-inner, .footer-bottom { width: calc(100vw - 32px); }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .button { width: 100%; }
  .field-row { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .platform { border-left: 0 !important; border-top: 1px solid var(--line); }
  .platform:first-child { border-top: 0; }
  .china-card { flex-direction: column; align-items: flex-start; }
  .footer-cols { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .task-row { grid-template-columns: 1fr; gap: 6px; }
  .feature-item { flex-wrap: wrap; }
}