/* OctoRead 官网设计系统 — 对齐 LegadoIOS/DesignSystem token */
:root {
  --canvas: #F5EFE4;
  --card: #FFFDF8;
  --outline: #D9C8B6;
  --accent: #AD5014;
  --accent-strong: #8F4210;
  --accent-soft: rgba(173, 80, 20, 0.08);
  --ink: #26211B;
  --ink-2: #6B5F52;
  --navy: #22303C;
  --success: #3E9B5D;
  --radius-card: 16px;
  --radius-panel: 22px;
  --radius-surface: 28px;
  --shadow-soft: 0 8px 18px rgba(38, 33, 27, 0.08);
  --shadow-float: 0 6px 12px rgba(38, 33, 27, 0.15);
  --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-display: ui-serif, "New York", "Songti SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --nav-h: 64px;
  color-scheme: light;
}
[data-theme="dark"] {
  --canvas: #14110F;
  --card: #28211B;
  --outline: #433830;
  --accent: #E49A59;
  --accent-strong: #F0B075;
  --accent-soft: rgba(228, 154, 89, 0.10);
  --ink: #EDE4D6;
  --ink-2: #A89A88;
  --navy: #C9D4DE;
  --shadow-soft: 0 8px 18px rgba(0, 0, 0, 0.35);
  --shadow-float: 0 6px 12px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --canvas: #14110F;
    --card: #28211B;
    --outline: #433830;
    --accent: #E49A59;
    --accent-strong: #F0B075;
    --accent-soft: rgba(228, 154, 89, 0.10);
    --ink: #EDE4D6;
    --ink-2: #A89A88;
    --navy: #C9D4DE;
    --shadow-soft: 0 8px 18px rgba(0, 0, 0, 0.35);
    --shadow-float: 0 6px 12px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--canvas);
  color: var(--ink);
  line-height: 1.65;
  font-size: 17px;
  transition: background 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
}
/* 纸张噪点质感（SVG feTurbulence，无位图） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncA type='linear' slope='0.035'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: var(--accent); color: var(--canvas); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 2; }

/* ---------- 导航（玻璃拟态） ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--canvas) 72%, transparent);
  -webkit-backdrop-filter: saturate(1.6) blur(18px);
  backdrop-filter: saturate(1.6) blur(18px);
  border-bottom: 1px solid color-mix(in srgb, var(--outline) 55%, transparent);
}
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  width: 100%;
  display: flex; align-items: center; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ink); letter-spacing: 0.01em; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; box-shadow: var(--shadow-float); }
.nav-links { display: flex; gap: 4px; margin-left: 8px; }
.nav-links a {
  color: var(--ink-2); font-size: 15px; padding: 7px 12px; border-radius: 10px;
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--ink); background: var(--accent-soft); text-decoration: none; }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 12px; border: 1px solid var(--outline);
  background: color-mix(in srgb, var(--card) 80%, transparent);
  color: var(--ink-2); cursor: pointer; font-size: 15px;
  display: inline-flex; align-items: center; justify-content: center; gap: 5px;
  transition: border-color .2s, color .2s, transform .15s;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.icon-btn svg { width: 18px; height: 18px; }
.lang-btn { width: auto; padding: 0 12px; font-weight: 600; font-size: 13.5px; letter-spacing: 0.03em; }
.nav-cta {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--accent); color: #FFF9F0; font-weight: 600; font-size: 15px;
  padding: 9px 18px; border-radius: 12px;
  box-shadow: var(--shadow-float);
  transition: transform .15s, background .2s;
}
.nav-cta:hover { background: var(--accent-strong); text-decoration: none; transform: translateY(-1px); }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; position: relative; }
.section-tight { padding: 64px 0; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 14px;
}
h1, h2, h3 { font-family: var(--font-display); color: var(--ink); line-height: 1.22; font-weight: 700; }
.h-display { font-size: clamp(38px, 6vw, 62px); letter-spacing: -0.015em; }
.h-section { font-size: clamp(28px, 4vw, 42px); letter-spacing: -0.01em; margin-bottom: 16px; }
.lead { font-size: clamp(17px, 2vw, 20px); color: var(--ink-2); max-width: 640px; }
.center { text-align: center; }
.center .lead { margin: 0 auto; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 16px; padding: 14px 26px; border-radius: 14px;
  transition: transform .15s, box-shadow .2s, background .2s, border-color .2s;
  cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #FFF9F0; box-shadow: var(--shadow-float); }
.btn-primary:hover { background: var(--accent-strong); text-decoration: none; transform: translateY(-2px); }
.btn-ghost { border-color: var(--outline); color: var(--ink); background: color-mix(in srgb, var(--card) 60%, transparent); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.btn svg { width: 18px; height: 18px; }

/* ---------- Hero ---------- */
.hero { padding: calc(var(--nav-h) + 72px) 0 88px; position: relative; overflow: hidden; }
.hero-glow {
  position: absolute; top: -180px; right: -120px; width: 640px; height: 640px;
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 62%);
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center; }
.hero-copy .lead { margin: 22px 0 34px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-badges { display: flex; gap: 18px; margin-top: 34px; flex-wrap: wrap; }
.hero-badge { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink-2); }
.hero-badge svg { width: 17px; height: 17px; color: var(--accent); flex-shrink: 0; }

/* 手机壳（CSS device frame） */
.device {
  position: relative; width: min(320px, 78vw); margin: 0 auto;
  border-radius: 52px; padding: 12px;
  background: linear-gradient(160deg, #3a332c, #17130f 60%);
  box-shadow: 0 30px 70px rgba(30, 22, 14, 0.35), inset 0 1px 1px rgba(255,255,255,0.25);
}
[data-theme="dark"] .device { background: linear-gradient(160deg, #4a4239, #241e18 60%); }
.device::before { /* 侧边按键 */
  content: ""; position: absolute; right: -2.5px; top: 140px; width: 3px; height: 76px;
  border-radius: 2px; background: #0d0a07;
}
.device-screen { border-radius: 41px; overflow: hidden; position: relative; background: #000; }
.device-screen img { width: 100%; display: block; }
.device-notch {
  position: absolute; top: 11px; left: 50%; transform: translateX(-50%);
  width: 34%; height: 27px; border-radius: 20px; background: #000; z-index: 3;
}
.hero-device { transform: rotate(2.5deg); transition: transform .6s cubic-bezier(.2,.8,.2,1); }
.hero-device:hover { transform: rotate(0deg) translateY(-6px); }
.hero-art { position: absolute; inset: auto 0 0 0; pointer-events: none; opacity: .9; }

/* ---------- 功能块 ---------- */
.feature-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center;
  padding: 72px 0;
}
.feature-row.flip > .feature-media { order: 2; }
.feature-copy h3 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 14px; }
.feature-copy p { color: var(--ink-2); margin-bottom: 20px; }
.tick-list { list-style: none; display: grid; gap: 12px; }
.tick-list li { display: flex; gap: 11px; align-items: flex-start; font-size: 15.5px; color: var(--ink); }
.tick-list svg { width: 19px; height: 19px; color: var(--accent); flex-shrink: 0; margin-top: 3px; }
.feature-media { display: flex; justify-content: center; }
.feature-media .shot {
  width: min(300px, 72vw); border-radius: 26px; overflow: hidden;
  border: 1px solid var(--outline); box-shadow: var(--shadow-soft);
  transition: transform .5s cubic-bezier(.2,.8,.2,1), box-shadow .3s;
}
.feature-media .shot:hover { transform: translateY(-8px); box-shadow: var(--shadow-float); }

/* ---------- 卡片网格 ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 44px; }
.card {
  background: var(--card); border: 1px solid var(--outline); border-radius: var(--radius-panel);
  padding: 30px 28px; box-shadow: var(--shadow-soft);
  transition: transform .3s cubic-bezier(.2,.8,.2,1), border-color .25s;
}
.card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--accent) 55%, var(--outline)); }
.card-icon {
  width: 46px; height: 46px; border-radius: 13px; background: var(--accent-soft);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.card-icon svg { width: 23px; height: 23px; color: var(--accent); }
.card h3 { font-size: 20px; margin-bottom: 9px; font-family: var(--font-body); font-weight: 700; }
.card p { font-size: 15px; color: var(--ink-2); }

/* ---------- 流程 SVG 区 ---------- */
.flow {
  background: var(--card); border: 1px solid var(--outline); border-radius: var(--radius-surface);
  padding: 48px 40px; box-shadow: var(--shadow-soft); margin-top: 44px;
}
.flow svg { width: 100%; height: auto; }
.flow-caption { text-align: center; color: var(--ink-2); font-size: 14.5px; margin-top: 22px; }

/* ---------- 隐私区 ---------- */
.privacy-band {
  background: linear-gradient(150deg, var(--navy) 0%, color-mix(in srgb, var(--navy) 78%, #000) 100%);
  border-radius: var(--radius-surface); padding: 64px 48px; color: #F3EDE3;
  position: relative; overflow: hidden;
}
[data-theme="dark"] .privacy-band { background: linear-gradient(150deg, #2B3947, #1A232D 100%); }
.privacy-band::after {
  content: ""; position: absolute; right: -90px; top: -90px; width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(228,154,89,.28), transparent 65%);
}
.privacy-band h2 { color: #FBF7EF; }
.privacy-band .lead { color: rgba(243, 237, 227, 0.78); }
.privacy-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; margin-top: 40px; position: relative; z-index: 2; }
.privacy-item { text-align: left; }
.privacy-item svg { width: 26px; height: 26px; color: #E49A59; margin-bottom: 12px; }
.privacy-item strong { display: block; font-size: 16.5px; margin-bottom: 5px; color: #FBF7EF; }
.privacy-item span { font-size: 14px; color: rgba(243, 237, 227, 0.72); line-height: 1.55; display: block; }

/* ---------- 截图画廊 ---------- */
.gallery { display: grid; grid-auto-flow: column; grid-auto-columns: min(240px, 60vw); gap: 22px; overflow-x: auto; padding: 12px 4px 26px; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; scrollbar-width: thin; scrollbar-color: var(--outline) transparent; }
.gallery figure { scroll-snap-align: start; }
.gallery img { border-radius: 22px; border: 1px solid var(--outline); box-shadow: var(--shadow-soft); }
.gallery figcaption { text-align: center; font-size: 14px; color: var(--ink-2); margin-top: 12px; }

/* ---------- CTA ---------- */
.cta-final { text-align: center; padding: 104px 0; position: relative; }
.cta-final .h-section { margin-bottom: 18px; }
.cta-final .lead { margin: 0 auto 36px; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--outline); padding: 48px 0 40px; margin-top: 40px;
  font-size: 14.5px; color: var(--ink-2);
}
.footer-grid { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; align-items: flex-start; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); font-size: 16px; }
.footer-brand img { width: 26px; height: 26px; border-radius: 7px; }
.footer-links { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-links a { color: var(--ink-2); }
.footer-links a:hover { color: var(--accent); }
.footer-legal { margin-top: 26px; font-size: 13px; color: color-mix(in srgb, var(--ink-2) 80%, transparent); }

/* ---------- 子页面 ---------- */
.page-head { padding: calc(var(--nav-h) + 64px) 0 40px; }
.page-head .lead { margin-top: 16px; }
.prose { max-width: 760px; }
.prose h2 { font-size: 26px; margin: 44px 0 14px; }
.prose p, .prose li { color: var(--ink-2); font-size: 16px; }
.prose ul { padding-left: 22px; display: grid; gap: 8px; margin-top: 10px; }
.faq { margin-top: 40px; display: grid; gap: 14px; }
.faq details {
  background: var(--card); border: 1px solid var(--outline); border-radius: var(--radius-card);
  padding: 20px 24px; box-shadow: var(--shadow-soft);
}
.faq summary { font-weight: 650; font-size: 16.5px; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 22px; color: var(--accent); font-weight: 400; transition: transform .25s; flex-shrink: 0; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin-top: 14px; color: var(--ink-2); font-size: 15.5px; }

/* 下载页 */
.download-hero { text-align: center; padding: calc(var(--nav-h) + 72px) 0 64px; }
.download-hero img.appicon-lg { width: 128px; height: 128px; border-radius: 30px; margin: 0 auto 28px; box-shadow: var(--shadow-float); }
.soon-pill {
  display: inline-flex; align-items: center; gap: 9px; margin-top: 26px;
  background: var(--accent-soft); color: var(--accent); font-weight: 650; font-size: 15px;
  padding: 10px 20px; border-radius: 999px; border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.soon-pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 1.8s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: .45; transform: scale(.82); } }
.req-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .soon-pill .dot { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 52px; text-align: center; }
  .hero-copy .lead { margin-left: auto; margin-right: auto; }
  .hero-ctas, .hero-badges { justify-content: center; }
  .feature-row { grid-template-columns: 1fr; gap: 40px; padding: 52px 0; }
  .feature-row.flip > .feature-media { order: 0; }
  .card-grid, .req-grid { grid-template-columns: 1fr; }
  .privacy-grid { grid-template-columns: repeat(2, 1fr); }
  .privacy-band { padding: 44px 28px; }
  .flow { padding: 30px 18px; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .nav-cta span { display: none; }
  .nav-cta { padding: 9px 13px; }
  .hero { padding-top: calc(var(--nav-h) + 44px); }
  .footer-grid { flex-direction: column; }
}