/* ==========================================================================
   NAPS2 中文官网 - 全局样式
   设计基调：扁平 / 现代 / 专业（配色源自 NAPS2 Logo：天蓝扫描面板 + 浅灰机身 + 绿色指示灯）
   ========================================================================== */

:root {
  /* 品牌色（取自 Logo） */
  --c-primary: #1188CE;        /* 主色 · 天蓝 */
  --c-primary-dark: #0C6399;
  --c-primary-deep: #0A4E77;
  --c-primary-light: #34A0DC;
  --c-primary-pale: #BFE2F6;
  --c-primary-tint: #E1F1FB;
  --c-primary-wash: #F1F8FD;
  --c-green: #1F9D55;          /* Logo 指示灯绿 · 用于开源/免费徽标 */
  --c-green-tint: #EAF6EF;
  --c-green-dark: #157A41;

  /* 中性色（Logo 机身的浅灰） */
  --ink: #172432;
  --ink-2: #2E3F50;
  --ink-3: #5A6B7C;
  --ink-4: #8A99A8;
  --line: #E1E8ED;
  --line-2: #EDF2F5;
  --bg: #FFFFFF;
  --bg-soft: #F6F9FB;
  --bg-soft-2: #FDFEFE;

  --shadow-sm: 0 1px 2px rgba(23, 42, 61, .05);
  --shadow-md: 0 4px 18px rgba(23, 42, 61, .09);
  --shadow-lg: 0 12px 40px rgba(23, 42, 61, .14);

  --radius: 10px;
  --radius-lg: 14px;
  --container: 1140px;
  --header-h: 66px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "SF Mono", "Cascadia Code", Consolas, "Liberation Mono", Menlo, monospace;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary-dark); text-decoration: none; }
a:hover { color: var(--c-primary); }
ul, ol { padding-left: 1.3em; margin: 0; }
li { margin: .3em 0; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.35; margin: 0 0 .5em; font-weight: 700; }
p { margin: 0 0 1em; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 3px solid rgba(17, 136, 206, .4); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--c-primary-tint); }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 999;
  background: var(--c-primary); color: #fff; padding: 10px 18px; border-radius: 8px;
  transition: top .2s;
}
.skip-link:focus { top: 12px; color: #fff; }

/* ---------- 布局 ---------- */
.container { width: min(var(--container), 92%); margin-inline: auto; }
.section { padding: 72px 0; }
.section--soft { background: var(--bg-soft); }
.section--tint { background: linear-gradient(180deg, var(--c-primary-wash) 0%, #FFFFFF 100%); }
.section-head { max-width: 760px; margin: 0 auto 48px; text-align: center; }
.section-head--left { text-align: left; margin-inline: 0; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .14em;
  color: var(--c-primary-dark); text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(24px, 3.2vw, 32px); }
.section-head .sub { color: var(--ink-3); font-size: 16.5px; margin-bottom: 0; }

/* ---------- 按钮（全站下载按钮统一样式，点击触发弹窗） ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 12px 24px; border-radius: 9px; border: 1px solid transparent;
  font: inherit; font-size: 15px; font-weight: 600; line-height: 1.3;
  cursor: pointer; white-space: nowrap;
  transition: background-color .18s, border-color .18s, box-shadow .18s, transform .18s, color .18s;
}
.btn svg { flex: none; }
.btn-primary { background: var(--c-primary); color: #fff; box-shadow: 0 2px 8px rgba(17, 136, 206, .32); }
.btn-primary:hover { background: var(--c-primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(17, 136, 206, .38); }
.btn-ghost { background: #fff; color: var(--ink-2); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--c-primary-light); color: var(--c-primary-dark); background: var(--c-primary-wash); }
.btn-white { background: #fff; color: var(--c-primary-dark); }
.btn-white:hover { background: var(--c-primary-tint); color: var(--c-primary-deep); transform: translateY(-1px); }
.btn-xl { padding: 16px 34px; font-size: 17px; border-radius: 11px; }
.btn-sm { padding: 8px 16px; font-size: 14px; border-radius: 8px; }
.btn-link { padding: 0; color: var(--c-primary-dark); font-weight: 600; background: none; }
.btn-link:hover { color: var(--c-primary); }
.btn-link svg { transition: transform .18s; }
.btn-link:hover svg { transform: translateX(3px); }

/* ---------- 徽标 ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; font-weight: 600; line-height: 1;
  padding: 6px 12px; border-radius: 999px;
  background: var(--c-primary-tint); color: var(--c-primary-deep);
}
.badge--green { background: var(--c-green-tint); color: var(--c-green-dark); }
.badge--line { background: #fff; border: 1px solid var(--line); color: var(--ink-3); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 120; height: var(--header-h);
  background: rgba(255, 255, 255, .96); backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid var(--line-2);
  transition: box-shadow .25s;
}
.site-header.is-scrolled { box-shadow: var(--shadow-md); }
.header-inner { display: flex; align-items: center; gap: 28px; height: var(--header-h); }
.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand img { width: 34px; height: 34px; }
.brand-name { font-size: 21px; font-weight: 800; color: var(--ink); letter-spacing: .01em; }
.brand-sub { font-size: 12px; color: var(--ink-4); border-left: 1px solid var(--line); padding-left: 10px; line-height: 1.3; }
.main-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.main-nav a {
  position: relative; padding: 8px 14px; font-size: 15px; font-weight: 500;
  color: var(--ink-2); border-radius: 8px;
}
.main-nav a:hover { color: var(--c-primary-dark); background: var(--c-primary-wash); }
.main-nav a[aria-current="page"] { color: var(--c-primary-dark); font-weight: 700; }
.main-nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px; height: 3px;
  border-radius: 3px; background: var(--c-primary);
}
.header-cta { flex: none; }
.nav-toggle {
  display: none; margin-left: auto; width: 42px; height: 42px; flex: none;
  border: 1px solid var(--line); border-radius: 9px; background: #fff; cursor: pointer;
  color: var(--ink-2); align-items: center; justify-content: center;
}
.nav-toggle:hover { border-color: var(--c-primary-light); color: var(--c-primary-dark); }

/* ---------- 页面小标题（面包屑） ---------- */
.page-hero { padding: 56px 0 40px; background: linear-gradient(180deg, var(--c-primary-wash) 0%, #fff 100%); border-bottom: 1px solid var(--line-2); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13.5px; color: var(--ink-4); margin-bottom: 14px; }
.breadcrumb a { color: var(--ink-3); }
.breadcrumb a:hover { color: var(--c-primary-dark); }
.breadcrumb .sep { color: var(--ink-4); }
.breadcrumb strong { color: var(--ink-2); font-weight: 600; }
.page-hero h1 { font-size: clamp(26px, 4vw, 38px); margin-bottom: 12px; }
.page-hero .lead { max-width: 820px; font-size: 16.5px; color: var(--ink-3); margin-bottom: 0; }

/* ---------- 首页 Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 76px 0 84px; background: linear-gradient(180deg, var(--c-primary-wash) 0%, #fff 92%); }
.hero::before {
  content: ""; position: absolute; right: -140px; top: -180px; width: 480px; height: 480px;
  border-radius: 50%; background: radial-gradient(closest-side, rgba(52, 160, 220, .16), transparent);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; left: -120px; bottom: -220px; width: 420px; height: 420px;
  border-radius: 50%; background: radial-gradient(closest-side, rgba(191, 226, 246, .5), transparent);
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.02fr .98fr; gap: 56px; align-items: center; }
.hero-copy .eyebrow { margin-bottom: 14px; }
.hero-copy h1 { font-size: clamp(30px, 4.6vw, 44px); line-height: 1.28; letter-spacing: -.01em; margin-bottom: 18px; }
.hero-copy .lead { font-size: 17px; color: var(--ink-3); max-width: 560px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 26px 0 18px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 10px; align-items: center; font-size: 13px; color: var(--ink-4); }
.hero-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--ink-4); }

/* 截图浏览器外框 */
.shot-frame {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden;
}
.shot-frame .bar {
  display: flex; align-items: center; gap: 7px; padding: 11px 16px;
  background: var(--bg-soft); border-bottom: 1px solid var(--line-2);
}
.shot-frame .bar i { width: 10px; height: 10px; border-radius: 50%; background: #DCE4EA; }
.shot-frame .bar i:nth-child(1) { background: #E88D8D; }
.shot-frame .bar i:nth-child(2) { background: #E9C98A; }
.shot-frame .bar i:nth-child(3) { background: #9AD7A9; }
.shot-frame .bar .url {
  margin-left: 10px; flex: 1; font: 500 12px/1 var(--mono); color: var(--ink-4);
  background: #fff; border: 1px solid var(--line-2); border-radius: 6px; padding: 6px 10px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.shot-frame img { width: 100%; }
.hero-visual { position: relative; }
.hero-float {
  position: absolute; z-index: 2; background: #fff; border: 1px solid var(--line);
  border-radius: 12px; box-shadow: var(--shadow-md); padding: 12px 16px;
  display: flex; align-items: center; gap: 12px;
}
.hero-float .num { font-size: 22px; font-weight: 800; color: var(--c-primary-dark); line-height: 1; font-variant-numeric: tabular-nums; }
.hero-float .lbl { font-size: 12.5px; color: var(--ink-3); line-height: 1.4; }
.hero-float--dl { left: -26px; bottom: 54px; }
.hero-float--ocr { right: -18px; top: -24px; }

/* ---------- 数据信任带 ---------- */
.stat-band { border-block: 1px solid var(--line-2); background: #fff; }
.stat-band-inner { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; padding: 34px 0; }
.stat-item { text-align: center; padding: 6px 10px; position: relative; }
.stat-item + .stat-item::before { content: ""; position: absolute; left: 0; top: 18%; bottom: 18%; width: 1px; background: var(--line-2); }
.stat-item .num { font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; color: var(--c-primary-dark); line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat-item .lbl { font-size: 13px; color: var(--ink-3); margin-top: 4px; line-height: 1.5; }
.stat-note { text-align: center; font-size: 12.5px; color: var(--ink-4); padding-bottom: 22px; margin: 0; }

/* ---------- 卡片网格 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 28px; transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--c-primary-pale); }
.card h3 { font-size: 17.5px; margin: 16px 0 8px; }
.card p { color: var(--ink-3); font-size: 14.5px; margin: 0; }
.icon-box {
  width: 52px; height: 52px; border-radius: 13px; display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-tint); color: var(--c-primary-dark); flex: none;
}
.icon-box svg { width: 26px; height: 26px; }
.icon-box--green { background: var(--c-green-tint); color: var(--c-green-dark); }

/* 优势卡带小标签 */
.card .badge { margin-top: 14px; }

/* ---------- 使用场景 ---------- */
.scenario { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 34px 0; }
.scenario + .scenario { border-top: 1px dashed var(--line); }
.scenario:nth-child(even) .scenario-copy { order: 2; }
.scenario-copy .tag { display: inline-flex; gap: 8px; align-items: center; font-size: 13px; font-weight: 700; color: var(--c-primary-dark); background: var(--c-primary-tint); padding: 6px 13px; border-radius: 999px; margin-bottom: 12px; }
.scenario-copy h3 { font-size: 22px; }
.scenario-copy p { color: var(--ink-3); }
.check-list { list-style: none; padding: 0; margin: 14px 0 0; }
.check-list li { display: flex; gap: 10px; align-items: flex-start; margin: 9px 0; color: var(--ink-2); font-size: 14.5px; line-height: 1.6; }
.check-list svg { flex: none; margin-top: 4px; color: var(--c-green); }
.scenario-shot { position: relative; }
.scenario-shot img { border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow-md); }
.scenario-shot .cap {
  position: absolute; left: 14px; bottom: 14px; background: rgba(23, 36, 50, .82); color: #fff;
  font-size: 12px; padding: 5px 11px; border-radius: 6px; backdrop-filter: blur(3px);
}

/* ---------- 三步流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; position: relative; }
.step {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 26px;
}
.step .no {
  width: 46px; height: 46px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: var(--c-primary); color: #fff; font-size: 19px; font-weight: 800; margin-bottom: 16px;
  box-shadow: 0 4px 10px rgba(17, 136, 206, .35);
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--ink-3); font-size: 14.5px; margin: 0; }

/* ---------- 截图功能卡 ---------- */
.shot-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; transition: transform .2s, box-shadow .2s; }
.shot-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.shot-card .pic { background: var(--bg-soft); padding: 18px; border-bottom: 1px solid var(--line-2); }
.shot-card .pic img { width: 100%; border-radius: 7px; border: 1px solid var(--line); }
.shot-card .txt { padding: 20px 22px; }
.shot-card .txt h3 { font-size: 16.5px; margin-bottom: 6px; }
.shot-card .txt p { font-size: 13.5px; color: var(--ink-3); margin: 0; }

/* ---------- 平台卡片 ---------- */
.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.platform-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 28px; text-align: center; transition: transform .2s, box-shadow .2s;
}
.platform-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.platform-glyph {
  width: 64px; height: 64px; margin: 0 auto 14px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-tint); color: var(--c-primary-deep);
}
.platform-glyph svg { width: 32px; height: 32px; }
.platform-card h3 { font-size: 19px; margin-bottom: 4px; }
.platform-card .req { font-size: 13.5px; color: var(--ink-3); margin-bottom: 18px; }
.platform-card .files { margin: 16px 0 0; padding: 14px 0 0; border-top: 1px dashed var(--line); font-size: 12.5px; color: var(--ink-4); line-height: 2; }
.platform-card .files a { display: block; color: var(--ink-3); }
.platform-card .files a:hover { color: var(--c-primary-dark); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; }
table.tbl { min-width: 560px; font-size: 14.5px; }
table.tbl th, table.tbl td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line-2); vertical-align: top; }
table.tbl thead th { background: var(--bg-soft); color: var(--ink); font-weight: 700; font-size: 13.5px; white-space: nowrap; }
table.tbl tbody tr:last-child td { border-bottom: none; }
table.tbl tbody tr:hover { background: var(--c-primary-wash); }
table.tbl td .muted { color: var(--ink-4); font-size: 12.5px; }
.tbl-note { font-size: 12.5px; color: var(--ink-4); margin-top: 10px; }

/* ---------- FAQ 折叠 ---------- */
.faq { display: grid; gap: 12px; max-width: 860px; margin: 0 auto; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.faq details[open] { border-color: var(--c-primary-pale); box-shadow: var(--shadow-sm); }
.faq summary {
  list-style: none; cursor: pointer; padding: 17px 54px 17px 20px; position: relative;
  font-weight: 600; color: var(--ink); font-size: 15.5px; user-select: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 20px; top: 50%; width: 9px; height: 9px;
  border-right: 2.5px solid var(--ink-4); border-bottom: 2.5px solid var(--ink-4);
  transform: translateY(-70%) rotate(45deg); transition: transform .2s;
}
.faq details[open] summary::after { transform: translateY(-30%) rotate(225deg); border-color: var(--c-primary); }
.faq .faq-body { padding: 0 20px 18px; color: var(--ink-3); font-size: 14.5px; }
.faq .faq-body p:last-child { margin-bottom: 0; }
.faq .faq-body a { word-break: break-all; }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--c-primary-deep) 0%, var(--c-primary) 100%);
  color: #fff; border-radius: 18px; padding: 54px 48px;
  display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap;
  position: relative; overflow: hidden;
}
.cta-band::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 260px; height: 260px;
  border-radius: 50%; background: rgba(255, 255, 255, .08);
}
.cta-band h2 { color: #fff; font-size: clamp(22px, 3vw, 28px); margin-bottom: 8px; }
.cta-band p { color: rgba(255, 255, 255, .82); margin: 0; max-width: 560px; }
.cta-band .act { position: relative; z-index: 1; display: flex; gap: 14px; flex-wrap: wrap; }
.cta-band .btn-primary { background: #fff; color: var(--c-primary-deep); box-shadow: 0 6px 16px rgba(4, 26, 43, .3); }
.cta-band .btn-primary:hover { background: var(--c-primary-tint); }

/* ---------- 代码块 ---------- */
.code-block {
  background: #14212E; color: #DCE9F5; border-radius: var(--radius);
  padding: 18px 20px; font-family: var(--mono); font-size: 13.5px; line-height: 1.8;
  overflow-x: auto; margin: 0 0 12px;
}
.code-block .cm { color: #7C93A8; }
.code-block .hl { color: #7CC5EA; }

/* ---------- 内容排版（指南/关于正文） ---------- */
.prose { max-width: 860px; }
.prose h2 { font-size: 24px; margin: 1.6em 0 .6em; }
.prose h3 { font-size: 18.5px; margin: 1.4em 0 .5em; }
.prose p { color: var(--ink-2); }
.prose ul li, .prose ol li { color: var(--ink-2); }
.prose figure { margin: 1.6em 0; }
.prose figure img { border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.prose figcaption { font-size: 13px; color: var(--ink-4); margin-top: 8px; text-align: center; }
.note {
  background: var(--c-primary-wash); border: 1px solid var(--c-primary-pale);
  border-radius: var(--radius); padding: 14px 18px; font-size: 14px; color: var(--ink-2);
  margin: 16px 0;
}
.note strong { color: var(--c-primary-deep); }

/* ---------- 指南步骤（大编号） ---------- */
.tutorial { display: grid; gap: 18px; }
.tut-item {
  display: grid; grid-template-columns: 52px 1fr; gap: 20px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px;
}
.tut-item .no {
  width: 52px; height: 52px; border-radius: 14px; background: var(--c-primary-tint);
  color: var(--c-primary-dark); font-size: 22px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.tut-item h3 { font-size: 18px; margin-bottom: 6px; }
.tut-item p { color: var(--ink-3); font-size: 14.5px; margin-bottom: 8px; }
.tut-item img { border: 1px solid var(--line); border-radius: 8px; margin-top: 10px; max-width: 520px; }

/* ---------- 下载页专属 ---------- */
.dl-hero-card {
  background: #fff; border: 1px solid var(--c-primary-pale); border-radius: 18px;
  box-shadow: var(--shadow-md); padding: 40px 44px;
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center;
}
.dl-hero-card .os-tag { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.dl-hero-card h2 { font-size: 26px; margin-bottom: 6px; }
.dl-hero-card .desc { color: var(--ink-3); font-size: 14.5px; margin-bottom: 18px; }
.dl-hero-card .meta-list { display: flex; flex-wrap: wrap; gap: 8px 10px; margin-top: 18px; }
.dl-side {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 14px; padding: 24px;
}
.dl-side h3 { font-size: 15px; margin-bottom: 10px; }
.dl-side ul { list-style: none; padding: 0; margin: 0; font-size: 13.5px; }
.dl-side li { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px dashed var(--line); color: var(--ink-3); }
.dl-side li:last-child { border-bottom: none; }
.dl-side li b { color: var(--ink-2); font-weight: 600; }

.file-list { display: grid; gap: 10px; }
.file-row {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px;
  transition: border-color .18s, box-shadow .18s;
}
.file-row:hover { border-color: var(--c-primary-pale); box-shadow: var(--shadow-sm); }
.file-row .fname { font-family: var(--mono); font-size: 13px; color: var(--ink-2); word-break: break-all; }
.file-row .fsize { font-size: 12.5px; color: var(--ink-4); margin-left: auto; white-space: nowrap; }
.file-row a { font-size: 13.5px; font-weight: 600; }

/* 平台切换 */
.dl-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.dl-tab {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 18px; border-radius: 999px;
  border: 1px solid var(--line); background: #fff; font: inherit; font-size: 14px; font-weight: 600;
  color: var(--ink-3); cursor: pointer; transition: all .18s;
}
.dl-tab:hover { border-color: var(--c-primary-light); color: var(--c-primary-dark); }
.dl-tab.is-active { background: var(--c-primary); border-color: var(--c-primary); color: #fff; box-shadow: 0 3px 10px rgba(17, 136, 206, .35); }
.dl-panel { display: none; }
.dl-panel.is-active { display: block; animation: fadeIn .3s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* 旧版本折叠 */
.legacy details { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.legacy summary {
  list-style: none; cursor: pointer; padding: 16px 20px; font-weight: 600; color: var(--ink-2);
  display: flex; align-items: center; gap: 10px; user-select: none;
}
.legacy summary::-webkit-details-marker { display: none; }
.legacy summary::before {
  content: ""; width: 8px; height: 8px; border-right: 2.5px solid var(--ink-4); border-bottom: 2.5px solid var(--ink-4);
  transform: rotate(-45deg); transition: transform .2s; margin-top: -3px;
}
.legacy details[open] summary::before { transform: rotate(45deg); border-color: var(--c-primary); }
.legacy .body { padding: 0 20px 18px; }

/* 下载统计条 */
.dl-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.dl-stat { text-align: center; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.dl-stat .num { font-size: 26px; font-weight: 800; color: var(--c-primary-dark); font-variant-numeric: tabular-nums; }
.dl-stat .lbl { font-size: 13px; color: var(--ink-3); margin-top: 4px; }

/* ---------- 关于页 ---------- */
.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: var(--c-primary-pale); }
.timeline li { list-style: none; position: relative; padding: 0 0 22px 14px; }
.timeline li::before {
  content: ""; position: absolute; left: -26px; top: 8px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--c-primary); border: 3px solid var(--c-primary-tint);
}
.timeline b { color: var(--ink); }
.timeline { margin: 0; padding-left: 26px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--bg-soft); border-top: 1px solid var(--line-2); padding: 56px 0 0; margin-top: 72px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand p { font-size: 13.5px; color: var(--ink-3); max-width: 300px; }
.footer-brand .brand { margin-bottom: 14px; }
.footer-col h4 { font-size: 14px; color: var(--ink); margin: 0 0 14px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin: 0 0 10px; }
.footer-col a { font-size: 13.5px; color: var(--ink-3); }
.footer-col a:hover { color: var(--c-primary-dark); }
.footer-col li span { font-size: 13.5px; color: var(--ink-4); }
.footer-bottom {
  border-top: 1px solid var(--line-2); padding: 20px 0; display: flex; flex-wrap: wrap;
  gap: 8px 24px; align-items: center; justify-content: space-between; font-size: 12.5px; color: var(--ink-4);
}
.footer-bottom a { color: var(--ink-3); }
.footer-bottom a:hover { color: var(--c-primary-dark); }

/* ---------- 下载弹窗 ---------- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 500; display: flex; align-items: center; justify-content: center;
  background: rgba(13, 26, 38, .58); backdrop-filter: blur(3px);
  padding: 22px; opacity: 0; pointer-events: none; transition: opacity .22s;
}
.modal-overlay.is-open { opacity: 1; pointer-events: auto; }
.modal-card {
  position: relative; width: min(600px, 100%); max-height: calc(100vh - 48px); overflow-y: auto;
  background: #fff; border-radius: 18px; box-shadow: var(--shadow-lg); padding: 34px 34px 28px;
  transform: translateY(14px) scale(.98); transition: transform .22s;
}
.modal-overlay.is-open .modal-card { transform: none; }
.modal-close {
  position: absolute; right: 16px; top: 16px; width: 36px; height: 36px; border-radius: 9px;
  border: 1px solid var(--line); background: #fff; color: var(--ink-3); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.modal-close:hover { border-color: var(--c-primary-light); color: var(--c-primary-dark); background: var(--c-primary-wash); }
.modal-eyebrow { font-size: 12.5px; font-weight: 700; letter-spacing: .1em; color: var(--c-primary-dark); margin: 0 0 6px; }
.modal-card h2 { font-size: 24px; margin: 0 0 6px; }
.modal-card .modal-desc { color: var(--ink-3); font-size: 14px; margin-bottom: 18px; }
.modal-tabs { display: flex; gap: 8px; margin-bottom: 18px; flex-wrap: wrap; }
.modal-tab {
  display: inline-flex; align-items: center; gap: 7px; padding: 8px 16px; border-radius: 999px;
  border: 1px solid var(--line); background: #fff; font: inherit; font-size: 13.5px; font-weight: 600;
  color: var(--ink-3); cursor: pointer; transition: all .16s;
}
.modal-tab:hover { border-color: var(--c-primary-light); color: var(--c-primary-dark); }
.modal-tab.is-active { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
#modalDlBtn { width: 100%; }
.modal-file { text-align: center; font-size: 12.5px; color: var(--ink-4); margin: 12px 0 4px; }
.modal-alts { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin: 4px 0 20px; }
.modal-alts a {
  font-size: 12.5px; color: var(--ink-3); background: var(--bg-soft); border: 1px solid var(--line);
  padding: 5px 12px; border-radius: 999px;
}
.modal-alts a:hover { color: var(--c-primary-dark); border-color: var(--c-primary-pale); background: var(--c-primary-wash); }
.modal-qrs {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  border-top: 1px dashed var(--line); padding-top: 22px;
}
.qr-item { text-align: center; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 16px 12px 13px; }
.qr-item img { width: 152px; margin: 0 auto 10px; border: 4px solid #fff; border-radius: 8px; box-shadow: var(--shadow-sm); }
.qr-item .qr-title { font-size: 13px; font-weight: 700; color: var(--ink-2); line-height: 1.5; margin: 0; }
.qr-item .qr-sub { font-size: 11.5px; color: var(--ink-4); margin: 2px 0 0; line-height: 1.5; }
.modal-note { font-size: 12px; color: var(--ink-4); text-align: center; margin: 18px 0 0; line-height: 1.6; }
.modal-note a { color: var(--ink-3); }

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90; width: 46px; height: 46px;
  border-radius: 50%; border: 1px solid var(--line); background: #fff; color: var(--ink-3);
  box-shadow: var(--shadow-md); cursor: pointer; display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transform: translateY(8px); transition: all .25s;
}
.to-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { color: var(--c-primary-dark); border-color: var(--c-primary-pale); }

/* ---------- 入场动效 ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-grid { gap: 36px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stat-band-inner { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .stat-item:nth-child(4)::before, .stat-item:nth-child(5)::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .dl-hero-card { grid-template-columns: 1fr; }
}
.mobile-nav{display:none;}
@media (max-width: 860px) {
  .section { padding: 54px 0; }
  .main-nav, .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-header.is-open { box-shadow: var(--shadow-md); }
  .mobile-nav {
    display: none; position: absolute; top: var(--header-h); left: 0; right: 0; z-index: 119;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md);
  }
  .site-header.is-open .mobile-nav { display: block; }
  .mobile-nav a { display: block; padding: 13px 22px; font-size: 15px; color: var(--ink-2); border-bottom: 1px solid var(--line-2); }
  .mobile-nav a[aria-current="page"] { color: var(--c-primary-dark); font-weight: 700; background: var(--c-primary-wash); }
  .mobile-nav .mobile-dl { padding: 14px 22px; }
  .mobile-nav .btn { width: 100%; }
  .hero { padding: 48px 0 60px; }
  .hero-grid, .scenario, .grid-2 { grid-template-columns: 1fr; }
  .scenario:nth-child(even) .scenario-copy { order: 0; }
  .scenario { gap: 28px; }
  .steps { grid-template-columns: 1fr; }
  .hero-float--dl { left: -6px; bottom: 30px; }
  .hero-float--ocr { right: -6px; top: -18px; }
  .cta-band { padding: 36px 28px; }
  .dl-stats { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .modal-qrs { grid-template-columns: 1fr; }
  .tut-item { grid-template-columns: 1fr; gap: 12px; }
}
@media (max-width: 560px) {
  .grid-3 { grid-template-columns: 1fr; }
  .stat-band-inner { grid-template-columns: repeat(2, 1fr); }
  .stat-item::before { display: none; }
  .hero-copy h1 { font-size: 29px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .hero-float { display: none; }
  .modal-card { padding: 26px 20px 22px; }
  .dl-hero-card { padding: 28px 22px; }
  .cta-band .act { width: 100%; }
  .cta-band .act .btn { flex: 1; }
}