/* ============================================================
   Mylus 官网 — 共享样式
   Token 来源：CLAUDE.md §2 / src/theme/tokens.ts（Web 翻译层）
   美学基因：app/(auth)/login.tsx（BgWash 网格水洗 + Watermark + SloganRotator）
   ============================================================ */
:root {
  --ease-out: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-slogan: cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  --font-body: var(--font-display);
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Cascadia Mono", monospace;
}
:root, :root[data-theme="dark"] {
  color-scheme: dark;
  --surface-base: #0A0908;
  --surface-card: #211913;
  --surface-elevated: #2A2018;
  --text-primary: #F5F0E8;
  --text-secondary: rgba(246, 235, 221, 0.72);
  --text-tertiary: rgba(246, 235, 221, 0.54);
  --accent: #FF6B1A;
  --accent-dim: #B34F18;
  --accent-08: rgba(255, 107, 26, 0.08);
  --accent-16: rgba(255, 107, 26, 0.16);
  --border-hairline: rgba(245, 239, 232, 0.06);
  --border-subtle: rgba(245, 239, 232, 0.08);
  --border-emphasis: rgba(245, 239, 232, 0.12);
  --border-brand: rgba(255, 107, 26, 0.30);
  --grid-line: rgba(255, 107, 26, 0.045);
  --wash-1: rgba(255, 107, 26, 0.13);
  --wash-2: rgba(255, 107, 26, 0.06);
  --nav-veil: rgba(10, 9, 8, 0.78);
  --menu-veil: rgba(10, 9, 8, 0.94);
  --shadow-card: 0 8px 12px rgba(0, 0, 0, 0.40);
  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.30);
}
:root[data-theme="light"] {
  color-scheme: light;
  --surface-base: #F2ECDC;
  --surface-card: #FAF5E6;
  --surface-elevated: #FFF8EA;
  --text-primary: #1A120B;
  --text-secondary: #5E4F3D;
  --text-tertiary: #7B654D;
  --accent: #C8102E;
  --accent-dim: #8C0B20;
  --accent-08: rgba(200, 16, 46, 0.06);
  --accent-16: rgba(200, 16, 46, 0.12);
  --border-hairline: rgba(26, 18, 11, 0.06);
  --border-subtle: rgba(140, 120, 98, 0.16);
  --border-emphasis: rgba(140, 120, 98, 0.24);
  --border-brand: rgba(200, 16, 46, 0.25);
  --grid-line: rgba(26, 18, 11, 0.06);
  --wash-1: rgba(200, 16, 46, 0.10);
  --wash-2: rgba(200, 16, 46, 0.04);
  --nav-veil: rgba(242, 236, 220, 0.80);
  --menu-veil: rgba(242, 236, 220, 0.95);
  --shadow-card: 0 4px 8px rgba(26, 18, 11, 0.08);
  --shadow-sm: 0 2px 4px rgba(26, 18, 11, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--surface-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color 300ms var(--ease-out), color 300ms var(--ease-out);
}
::selection { background: var(--accent-16); }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
:focus-visible { outline: 1.5px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* —— 背景网格（§0.1：网格是签名，永远存在，竖线 20px）—— */
.grid-layer {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 20px);
}

/* ============ 导航 ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(18px + env(safe-area-inset-top, 0px)) max(28px, env(safe-area-inset-right, 0px)) 18px max(28px, env(safe-area-inset-left, 0px));
  transition: background-color 240ms var(--ease-out), border-color 240ms var(--ease-out);
  border-bottom: 1px solid transparent;
}
.nav.scrolled, .nav.solid {
  background: var(--nav-veil);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border-hairline);
}
.nav-brand {
  font-family: var(--font-display);
  font-weight: 600; font-size: 19px; letter-spacing: -0.4px;
  text-decoration: none; color: var(--text-primary);
}
.nav-links { display: flex; gap: 26px; }
.nav-links a {
  text-decoration: none; font-size: 13px; color: var(--text-tertiary);
  transition: color 140ms var(--ease-out);
}
.nav-links a:hover, .nav-links a:focus-visible, .nav-links a.current { color: var(--text-primary); }
.nav-ctrls { display: flex; align-items: center; gap: 10px; }
.ctrl-btn {
  height: 32px; min-width: 44px; padding: 0 12px;
  border: 1px solid var(--border-subtle); border-radius: 9999px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 600; letter-spacing: 1px;
  color: var(--text-secondary);
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  transition: color 140ms var(--ease-out), border-color 140ms var(--ease-out), background-color 140ms var(--ease-out);
}
.ctrl-btn:hover, .ctrl-btn:focus-visible { color: var(--text-primary); border-color: var(--border-emphasis); background: var(--accent-08); }
.theme-icon { width: 14px; height: 14px; display: block; }
.menu-btn { display: none; }
.menu-icon { width: 16px; height: 16px; display: block; }

/* 移动端菜单面板 */
.mobile-menu {
  position: fixed; top: 0; left: 0; right: 0; z-index: 49;
  padding: calc(76px + env(safe-area-inset-top, 0px)) max(28px, env(safe-area-inset-right, 0px)) 24px max(28px, env(safe-area-inset-left, 0px));
  background: var(--menu-veil);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-hairline);
  display: none; flex-direction: column;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  text-decoration: none; color: var(--text-secondary);
  font-size: 16px; font-weight: 600; letter-spacing: -0.01em;
  padding: 13px 2px;
  border-top: 1px solid var(--border-hairline);
  transition: color 140ms var(--ease-out);
}
.mobile-menu a:first-child { border-top: none; }
.mobile-menu a:hover, .mobile-menu a.current { color: var(--text-primary); }

/* ============ Hero（登录页 BgWash + Watermark + SloganRotator 的 Web 翻译）============ */
.hero {
  position: relative; z-index: 1;
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 120px 28px 72px;
  overflow: hidden;
}
.hero-wash {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(75% 55% at 75% 12%, var(--wash-1) 0%, transparent 72%),
    radial-gradient(55% 50% at 8% 0%, var(--wash-2) 0%, transparent 70%),
    linear-gradient(to bottom, transparent 60%, var(--surface-base) 100%);
}
.watermark {
  position: absolute; top: 20%; left: 50%; transform: translateX(-50%);
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(140px, 26vw, 280px); line-height: 1;
  letter-spacing: -0.045em; color: var(--accent);
  opacity: 0; pointer-events: none; user-select: none; white-space: nowrap;
  animation: wm-enter 1800ms 200ms var(--ease-out) forwards,
             wm-breathe 10s 2s ease-in-out infinite,
             wm-drift 16s ease-in-out infinite;
}
@keyframes wm-enter { to { opacity: 0.10; } }
@keyframes wm-breathe { 0%, 100% { opacity: 0.10; } 50% { opacity: 0.055; } }
@keyframes wm-drift { 0%, 100% { transform: translateX(-50%); } 50% { transform: translateX(calc(-50% + 10px)); } }

.hero-inner { position: relative; max-width: 1080px; width: 100%; margin: 0 auto; }
.slogan { min-height: 4.6em; }
.slogan-line {
  display: block;
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(38px, 6.4vw, 72px);
  line-height: 1.16; letter-spacing: -0.028em;
  text-wrap: balance;
  opacity: 0; transform: translateY(14px);
}
.slogan-line.in { animation: rise 900ms var(--ease-slogan) forwards; }
.slogan-line.is-accent { color: var(--accent); }
@keyframes rise { to { opacity: 1; transform: translateY(0); } }
.slogan-sub {
  margin-top: 22px; max-width: 400px;
  font-size: 16px; color: var(--text-secondary);
  opacity: 0; transform: translateY(10px);
}
.slogan-sub.in { animation: rise 900ms 320ms var(--ease-slogan) forwards; }
.slogan-dots { display: flex; gap: 6px; margin-top: 26px; }
.slogan-dots button {
  width: 6px; height: 6px; border-radius: 3px;
  background: var(--border-emphasis); padding: 0;
  transition: width 180ms var(--ease-out), background-color 180ms var(--ease-out);
}
.slogan-dots button.active { width: 20px; background: var(--accent); }

.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 44px; }
.cta {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 52px; padding: 0 24px;
  border-radius: 16px;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  font-weight: 600; font-size: 15px; text-decoration: none;
  color: var(--text-primary);
  transition: transform 80ms var(--ease-out), border-color 140ms var(--ease-out), background-color 140ms var(--ease-out);
}
.cta:hover { border-color: var(--border-emphasis); }
.cta:active { transform: scale(0.97); }
.cta .pulse-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.cta.ghost { background: transparent; box-shadow: none; color: var(--text-secondary); }
.cta.ghost:hover { color: var(--text-primary); }
.cta.solid {
  background: var(--accent); border-color: transparent; color: #F5F0E8;
}
.cta.solid:hover { border-color: transparent; filter: brightness(1.05); }

.hero-stores {
  margin-top: 18px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 1.4px; color: var(--text-tertiary);
}

.hero-scrollcue {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 3px; color: var(--text-tertiary);
  text-decoration: none;
}

/* ============ 期刊章节骨架 ============ */
main { position: relative; z-index: 1; }
.section { padding: 108px 28px; }
.section-inner { max-width: 1080px; margin: 0 auto; }
.eyebrow {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 2.2px; text-transform: uppercase;
  color: var(--text-tertiary);
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 26px;
}
.eyebrow::after { content: ""; flex: 0 0 56px; height: 1px; background: var(--border-emphasis); }
.section h2, .page-title {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(26px, 3.6vw, 40px); line-height: 1.18; letter-spacing: -0.024em;
  text-wrap: balance;
  max-width: 22em;
}
.prose { max-width: 62ch; margin-top: 26px; color: var(--text-secondary); font-size: 16px; }
.prose p + p { margin-top: 16px; }
.prose strong { color: var(--text-primary); font-weight: 600; }
.pull {
  margin-top: 34px; padding-left: 22px;
  border-left: 2px solid var(--accent);
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(18px, 2.4vw, 24px); line-height: 1.4; letter-spacing: -0.015em;
  color: var(--text-primary); max-width: 26em;
}

/* —— 滚动显现 —— */
.reveal { opacity: 0; transform: translateY(12px); }
.reveal.in { animation: rise 500ms var(--ease-out) forwards; }

/* ============ §02 方法：闭环步骤 ============ */
.steps { margin-top: 52px; display: flex; flex-direction: column; }
.step {
  display: grid; grid-template-columns: 64px 150px 1fr; gap: 20px;
  padding: 26px 0;
  border-top: 1px solid var(--border-hairline);
}
.step:last-child { border-bottom: 1px solid var(--border-hairline); }
.step-no {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600;
  letter-spacing: 1.2px; color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
  padding-top: 4px;
}
.step-title { font-weight: 600; font-size: 18px; letter-spacing: -0.01em; }
.step-body { color: var(--text-secondary); font-size: 15px; max-width: 56ch; }

/* ============ §03 章节卡（§3.1 卡片规范）============ */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 52px; }
.card {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  padding: 30px 26px 32px;
  display: flex; flex-direction: column; gap: 14px;
  transition: transform 200ms var(--ease-out), border-color 200ms var(--ease-out);
}
.card:hover { transform: translateY(-3px); border-color: var(--border-subtle); }
.card .card-tag {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 1.8px; text-transform: uppercase; color: var(--accent-dim);
}
.card h3 { font-weight: 600; font-size: 19px; letter-spacing: -0.015em; }
.card p { color: var(--text-secondary); font-size: 14px; }

/* ============ §04 规格：仪器数据条 ============ */
.specs {
  margin-top: 52px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
}
.spec { padding: 34px 22px; }
.spec + .spec { border-left: 1px solid var(--border-hairline); }
.spec-num {
  font-family: var(--font-mono); font-weight: 600;
  font-size: clamp(30px, 4.6vw, 46px); line-height: 1; letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.spec-label {
  margin-top: 12px;
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 1.6px; text-transform: uppercase; color: var(--text-tertiary);
  line-height: 1.7;
}
.spec-foot { margin-top: 26px; color: var(--text-tertiary); font-size: 13px; max-width: 60ch; }

/* ============ §03 精度 · 证据基础 ============ */
.evidence {
  margin-top: 56px; padding-top: 34px;
  border-top: 1px solid var(--border-hairline);
}
.ev-label {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 1.8px; text-transform: uppercase; color: var(--accent-dim);
}
.ev-lead { margin-top: 14px; color: var(--text-secondary); font-size: 15px; max-width: 60ch; }
.ev-tags { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 10px; }
.ev-chip {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.4px;
  color: var(--text-tertiary);
  padding: 8px 14px;
  border: 1px solid var(--border-subtle); border-radius: 9999px;
  transition: color 140ms var(--ease-out), border-color 140ms var(--ease-out);
}
.ev-chip:hover { color: var(--text-primary); border-color: var(--border-emphasis); }

/* ============ §06 原则 ============ */
.principles { margin-top: 52px; display: grid; grid-template-columns: 1fr 1fr; gap: 0 56px; }
.principle { padding: 24px 0; border-top: 1px solid var(--border-hairline); }
.principle h3 { font-weight: 600; font-size: 17px; letter-spacing: -0.01em; }
.principle h3::before { content: "— "; color: var(--accent-dim); }
.principle p { margin-top: 8px; color: var(--text-secondary); font-size: 14px; max-width: 46ch; }

/* ============ §06 FAQ ============ */
.faq { margin-top: 44px; max-width: 760px; }
.faq details { border-top: 1px solid var(--border-hairline); }
.faq details:last-child { border-bottom: 1px solid var(--border-hairline); }
.faq summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: baseline; justify-content: space-between; gap: 20px;
  padding: 22px 4px;
  font-weight: 600; font-size: 16px; letter-spacing: -0.01em;
  transition: color 140ms var(--ease-out);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--font-mono); font-size: 16px; color: var(--text-tertiary);
  transition: transform 180ms var(--ease-out), color 180ms var(--ease-out);
  flex: none;
}
.faq details[open] summary::after { transform: rotate(45deg); color: var(--accent); }
.faq .answer { padding: 0 4px 24px; color: var(--text-secondary); font-size: 14.5px; max-width: 62ch; }
.faq .answer a { color: var(--accent); text-underline-offset: 3px; }

/* ============ 文档页（法务 / 支持）============ */
.doc-page { padding: 148px 28px 96px; position: relative; z-index: 1; }
.doc-inner { max-width: 760px; margin: 0 auto; }
.doc-meta { margin-top: 14px; color: var(--text-tertiary); font-size: 13.5px; }
.doc-operator {
  margin-top: 26px;
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  padding: 16px 20px;
  color: var(--text-secondary); font-size: 13.5px;
}
.doc-operator a { color: var(--accent); text-underline-offset: 3px; }
.doc-toc {
  margin-top: 34px; padding: 20px 22px;
  border: 1px solid var(--border-hairline); border-radius: 12px;
}
.doc-toc-title {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 1.8px; text-transform: uppercase; color: var(--text-tertiary);
  margin-bottom: 10px;
}
.doc-toc ol { list-style: none; columns: 2; column-gap: 36px; }
.doc-toc a {
  display: block; padding: 3.5px 0;
  text-decoration: none; color: var(--text-secondary); font-size: 13px;
  transition: color 140ms var(--ease-out);
}
.doc-toc a:hover { color: var(--accent); }
.doc-body { margin-top: 44px; }
.doc-body h2 {
  font-family: var(--font-display); font-weight: 600;
  font-size: 19px; letter-spacing: -0.015em; line-height: 1.3;
  margin: 40px 0 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border-hairline);
  max-width: none;
}
.doc-body h3 { font-weight: 600; font-size: 15.5px; margin: 22px 0 8px; }
.doc-body h1 {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(22px, 3vw, 32px); letter-spacing: -0.02em; line-height: 1.2;
  margin: 0 0 6px;
}
.doc-body .doc-lang-divider { margin: 56px 0 28px; border-top: 1px solid var(--border-emphasis); }
.doc-body .meta { color: var(--text-tertiary); font-size: 13px; }
.doc-body p { margin: 0 0 13px; color: var(--text-secondary); font-size: 15px; max-width: 68ch; }
.doc-body strong { color: var(--text-primary); font-weight: 600; }
.doc-body ul { margin: 0 0 13px; padding-left: 22px; color: var(--text-secondary); font-size: 15px; }
.doc-body li { margin-bottom: 6px; }
.doc-body a { color: var(--accent); text-underline-offset: 3px; }
.doc-lang-divider {
  margin: 56px 0 40px; padding-top: 40px;
  border-top: 1px solid var(--border-emphasis);
}
.doc-lang-divider .page-title { font-size: clamp(22px, 3vw, 32px); }

/* 支持页卡片 */
.support-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 44px; }
.support-card {
  background: var(--surface-card);
  border: 1px solid var(--border-hairline);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  padding: 28px 26px 30px;
}
.support-card .card-tag {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 1.8px; text-transform: uppercase; color: var(--accent-dim);
}
.support-card h3 { font-weight: 600; font-size: 18px; letter-spacing: -0.015em; margin-top: 12px; }
.support-card p { color: var(--text-secondary); font-size: 14px; margin-top: 10px; }
.support-card a { color: var(--accent); text-underline-offset: 3px; }
.support-links { margin-top: 44px; }
.support-links a {
  display: flex; align-items: baseline; justify-content: space-between; gap: 20px;
  padding: 18px 4px;
  border-top: 1px solid var(--border-hairline);
  text-decoration: none; color: var(--text-primary);
  font-weight: 600; font-size: 15px;
  transition: color 140ms var(--ease-out);
}
.support-links a:last-child { border-bottom: 1px solid var(--border-hairline); }
.support-links a::after {
  content: "→"; font-family: var(--font-mono);
  color: var(--text-tertiary); flex: none;
  transition: color 140ms var(--ease-out), transform 140ms var(--ease-out);
}
.support-links a:hover::after { color: var(--accent); transform: translateX(3px); }
.support-links .hint { color: var(--text-tertiary); font-size: 12.5px; font-weight: 400; margin-left: auto; }

/* 404 */
.notfound {
  min-height: 100svh; position: relative; z-index: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 28px;
}
.notfound .code {
  font-family: var(--font-mono); font-weight: 600;
  font-size: clamp(80px, 18vw, 160px); line-height: 1; letter-spacing: -0.04em;
  color: var(--accent); opacity: 0.9;
  font-variant-numeric: tabular-nums;
}
.notfound p { margin-top: 18px; color: var(--text-secondary); font-size: 16px; }
.notfound .cta { margin-top: 32px; }

/* ============ 页脚 ============ */
footer.site-footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border-hairline);
  padding: 56px 28px 44px;
}
.footer-inner { max-width: 1080px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 44px; justify-content: space-between; }
.footer-brand .wordmark { font-weight: 600; font-size: 18px; letter-spacing: -0.4px; }
.footer-brand p { margin-top: 8px; color: var(--text-tertiary); font-size: 13px; max-width: 26ch; }
.footer-cols { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-col h4 {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 1.8px; text-transform: uppercase; color: var(--text-tertiary);
  margin-bottom: 14px;
}
.footer-col a {
  display: block; text-decoration: none;
  color: var(--text-secondary); font-size: 13.5px; padding: 4px 0;
  transition: color 140ms var(--ease-out);
}
.footer-col a:hover { color: var(--text-primary); }
.footer-meta {
  max-width: 1080px; margin: 44px auto 0; padding-top: 22px;
  border-top: 1px solid var(--border-hairline);
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between;
  color: var(--text-tertiary); font-size: 12px;
}

/* ============ 响应式 ============ */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .menu-btn { display: inline-flex; min-width: 44px; }
  .ctrl-btn { height: 38px; min-width: 48px; }
  .hero, .section, .doc-page {
    padding-left: max(22px, env(safe-area-inset-left, 0px));
    padding-right: max(22px, env(safe-area-inset-right, 0px));
  }
  .site-footer {
    padding-left: max(28px, env(safe-area-inset-left, 0px));
    padding-right: max(28px, env(safe-area-inset-right, 0px));
    padding-bottom: calc(44px + env(safe-area-inset-bottom, 0px));
  }
  .step { grid-template-columns: 52px 1fr; }
  .step-body { grid-column: 2; }
  .cards, .support-grid { grid-template-columns: 1fr; }
  .specs { grid-template-columns: 1fr 1fr; }
  .spec:nth-child(3) { border-left: none; }
  .spec:nth-child(n+3) { border-top: 1px solid var(--border-hairline); }
  .principles { grid-template-columns: 1fr; gap: 0; }
  .section { padding: 76px 22px; }
  .hero { padding: 110px 22px 80px; }
  .doc-page { padding: 128px 22px 80px; }
  .doc-toc ol { columns: 1; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .watermark { animation: none; opacity: 0.10; }
  .slogan-line, .slogan-sub, .reveal { opacity: 1 !important; transform: none !important; animation: none !important; }
  .cta .pulse-dot { animation: none; }
  * { transition-duration: 0.01ms !important; }
}