/* =========================================================
   SoundSwitch 官方中文站 — 全局样式
   品牌色：深蓝 #0D47A1 / 青蓝 #3DDEED / 米白 #E5E3DC
   风格：扁平 · 现代 · 专业（无 emoji）
   ========================================================= */

:root {
  --primary: #0D47A1;
  --primary-dark: #09357A;
  --primary-deeper: #07295E;
  --primary-soft: #E8EEF9;
  --accent: #3DDEED;
  --accent-strong: #00B8D4;
  --link-blue: #1A73E8;
  --sand: #E5E3DC;
  --bg: #F6F8FC;
  --bg-alt: #EDF1F8;
  --surface: #FFFFFF;
  --text: #16233B;
  --text-secondary: #56688A;
  --text-muted: #6E7F9C;
  --border: #E2E8F2;
  --success: #12805C;
  --warning: #B26A00;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(13, 71, 161, 0.08), 0 1px 2px rgba(13, 71, 161, 0.04);
  --shadow-md: 0 10px 30px rgba(13, 71, 161, 0.12);
  --shadow-lg: 0 24px 60px rgba(7, 41, 94, 0.22);
  --grad-primary: linear-gradient(135deg, #0D47A1 0%, #0A3A85 55%, #082E6B 100%);
  --grad-cta: linear-gradient(135deg, #0D47A1 0%, #1A5CC8 100%);
  --grad-accent: linear-gradient(135deg, #3DDEED 0%, #00B8D4 100%);
  --font: "Inter", "Noto Sans SC", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Cascadia Code", Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

/* 键盘焦点可见性（P0 a11y） */
:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 2px;
}
.btn:focus-visible,
.nav-links a:focus-visible,
.nav-toggle:focus-visible,
.faq-q:focus-visible,
.modal-close:focus-visible,
.anchor-nav a:focus-visible,
.sticky-dlbar .btn:focus-visible {
  outline-offset: 3px;
}

/* 锚点跳转预留吸顶导航高度 */
#features, #scenarios, #reviews, #faq { scroll-margin-top: 88px; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; display: block; }
/* 图标风格统一：Lucide 风格参数（统一描边宽度与线帽） */
svg[stroke="currentColor"] { stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
svg.fill-star { fill: currentColor; stroke: none; }
a { color: var(--link-blue); text-decoration: none; }
a:hover { text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 通用标题 ---------- */
.section { padding: 88px 0; }
.section-alt { background: var(--surface); }

.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.eyebrow::before,
.eyebrow::after {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px;
}
.eyebrow.plain::before, .eyebrow.plain::after { display: none; }

.section-title {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1.25;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.01em;
}

.section-desc {
  margin-top: 16px;
  font-size: 17px;
  color: var(--text-secondary);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 700;
  border: 2px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s ease;
  white-space: nowrap;
}
.btn svg { flex-shrink: 0; }
.btn:active { transform: translateY(1px) scale(0.99); }

.btn-primary {
  background: var(--grad-cta);
  color: #fff;
  box-shadow: 0 10px 24px rgba(13, 71, 161, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(13, 71, 161, 0.42);
  color: #fff;
}

.btn-accent {
  background: var(--grad-accent);
  color: #053A4A;
  box-shadow: 0 10px 24px rgba(0, 184, 212, 0.35);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(0, 184, 212, 0.45);
  color: #053A4A;
}

.btn-outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }

.btn-light {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 10px 24px rgba(7, 41, 94, 0.28);
}
.btn-light:hover { transform: translateY(-2px); color: var(--primary); box-shadow: 0 16px 34px rgba(7, 41, 94, 0.36); }

.btn-sm { padding: 9px 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ---------- 徽章 ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
}
.badge-blue { background: var(--primary-soft); color: var(--primary); }
.badge-green { background: #E2F5EC; color: var(--success); }
.badge-sand { background: #F0EEE8; color: #57503E; }

/* =========================================================
   顶部导航
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 88px; width: auto; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  display: block;
  padding: 9px 16px;
  border-radius: 999px;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  transition: background 0.16s ease, color 0.16s ease;
}
.nav-links .nav-cta{color: #fff;display: flex;}
.nav-links a:hover { color: var(--primary); background: var(--primary-soft); }
.nav-links a.active { color: #fff; background: var(--primary); }

.nav-cta { margin-left: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 2.4px;
  background: var(--primary);
  border-radius: 2px;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7.4px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.4px) rotate(-45deg); }

/* =========================================================
   首页 Hero
   ========================================================= */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--grad-primary);
  color: #fff;
  padding: 108px 0 96px;
}
.hero::before {
  content: "";
  position: absolute;
  top: -260px;
  right: -200px;
  width: 640px;
  height: 640px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 222, 237, 0.28) 0%, rgba(61, 222, 237, 0) 68%);
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -320px;
  left: -220px;
  width: 720px;
  height: 720px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 222, 237, 0.16) 0%, rgba(61, 222, 237, 0) 65%);
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(61, 222, 237, 0.14);
  border: 1px solid rgba(61, 222, 237, 0.4);
  color: #BFF3FA;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-kicker .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.hero h1 {
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.015em;
  margin-bottom: 22px;
}
.hero h1 .grad-text {
  background: linear-gradient(90deg, #3DDEED, #7FE9F4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  font-size: 18px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  max-width: 540px;
  margin-bottom: 36px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 40px; }
.hero-note {
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.68);
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-note svg { color: var(--accent); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.stat-card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  padding: 22px 18px;
  backdrop-filter: blur(4px);
  transition: background 0.2s ease, transform 0.2s ease;
}
.stat-card:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-3px); }
.stat-num {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 3px;
}
.stat-num small { font-size: 15px; font-weight: 700; color: var(--accent); }
.stat-label {
  margin-top: 6px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.68);
}

.hero-visual {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
}
.app-card {
  width: 100%;
  max-width: 380px;
  background: #fff;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  padding: 22px;
  color: var(--text);
}
.app-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}
.app-card-head .dot-group { display: flex; gap: 6px; }
.app-card-head .dot-group i {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--border);
}
.app-card-head .dot-group i:nth-child(1) { background: #FFB4A2; }
.app-card-head .dot-group i:nth-child(2) { background: #FFD666; }
.app-card-head .dot-group i:nth-child(3) { background: #7EE0A3; }
.app-card-title { font-size: 13px; font-weight: 700; color: var(--text-secondary); }

.app-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 4px;
  border-radius: var(--radius-sm);
  transition: background 0.16s ease;
}
.app-row:hover { background: var(--bg); }
.app-row + .app-row { border-top: 1px dashed var(--border); }
.app-row .device {
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 14px;
  font-weight: 600;
}
.app-row .device .ic {
  width: 34px; height: 34px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.ic-speaker { background: #E8EEF9; color: var(--primary); }
.ic-headset { background: #E2F5EC; color: var(--success); }
.ic-mic { background: #FFF2DE; color: var(--warning); }
.app-row .tag {
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 999px;
  font-weight: 700;
}
.tag-active { background: var(--primary); color: #fff; }
.tag-off { background: var(--bg-alt); color: var(--text-muted); }
.app-row .status { font-size: 12px; color: var(--text-muted); }

.app-hint {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--primary-soft);
  border-radius: 10px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
}
.app-hint kbd {
  background: #fff;
  border: 1px solid #CBD8EF;
  border-bottom-width: 3px;
  border-radius: 6px;
  padding: 2px 8px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 12px;
  color: var(--primary);
}

.float-chip {
  position: absolute;
  background: #fff;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  animation: float 4.5s ease-in-out infinite;
}
.float-chip small { display: block; font-weight: 500; color: var(--text-muted); font-size: 11.5px; }
.float-chip .chip-ic {
  width: 32px; height: 32px;
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
}
.chip-1 { top: -16px; left: -40px; animation-delay: 0s; }
.chip-1 .chip-ic { background: var(--grad-accent); }
.chip-2 { bottom: -18px; right: -32px; animation-delay: 1.6s; }
.chip-2 .chip-ic { background: var(--grad-cta); }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-9px); }
}

/* =========================================================
   数据条（logo 下方横幅）
   ========================================================= */
.data-strip {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 26px 0;
}
.data-strip-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 24px;
}
.data-item { text-align: center; }
.data-item .num {
  font-size: 26px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}
.data-item .lbl { font-size: 13.5px; color: var(--text-secondary); margin-top: 2px; }
.data-divider { width: 1px; background: var(--border); }

/* ---------- 首页二级锚点导航 ---------- */
.anchor-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.anchor-nav-inner {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 16px 24px;
  overflow-x: auto;
}
.anchor-nav a {
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  white-space: nowrap;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.anchor-nav a:hover {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}

/* =========================================================
   功能卡片
   ========================================================= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s ease;
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: #C6D6F0;
}
.feature-card:hover::before { transform: scaleX(1); }

.feature-ic {
  width: 54px; height: 54px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  background: var(--grad-cta);
  margin-bottom: 20px;
  box-shadow: 0 8px 18px rgba(13, 71, 161, 0.28);
}
.feature-card.alt .feature-ic { background: var(--grad-accent); color: #053A4A; }
.feature-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.feature-card p { font-size: 14.5px; color: var(--text-secondary); }
.feature-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

/* =========================================================
   使用场景
   ========================================================= */
.scenario-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.scenario-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.scenario-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.scenario-visual {
  height: 150px;
  background: var(--grad-primary);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.scenario-visual::after {
  content: "";
  position: absolute;
  width: 220px; height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61,222,237,0.35) 0%, rgba(61,222,237,0) 70%);
  right: -40px; top: -70px;
}
.scenario-visual .vis-ic {
  width: 64px; height: 64px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  backdrop-filter: blur(4px);
  z-index: 2;
}
.scenario-body { padding: 26px; flex: 1; display: flex; flex-direction: column; }
.scenario-body h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.scenario-body p { font-size: 14.5px; color: var(--text-secondary); flex: 1; }
.scenario-foot {
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

/* ---------- 用户评价聚合条 ---------- */
.review-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 20px 32px;
  max-width: 680px;
  margin: -20px auto 44px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 30px;
  box-shadow: var(--shadow-sm);
}
.review-summary-stars { display: flex; align-items: center; gap: 12px; }
.review-summary-stars .stars { margin-bottom: 0; }
.review-score { font-size: 32px; font-weight: 800; line-height: 1; color: var(--text); }
.review-count { font-size: 13px; color: var(--text-secondary); }
.review-summary-meta { display: flex; gap: 10px; flex-wrap: wrap; }

/* =========================================================
   用户评价
   ========================================================= */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.stars { display: flex; gap: 3px; color: #F5A623; margin-bottom: 14px; }
.review-quote {
  font-size: 14.5px;
  color: var(--text);
  line-height: 1.85;
  flex: 1;
}
.review-quote::before {
  content: "\201C";
  display: block;
  font-size: 34px;
  line-height: 0.6;
  color: var(--primary);
  opacity: 0.35;
  margin-bottom: 6px;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--grad-cta);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}
.avatar.sand { background: var(--grad-accent); color: #053A4A; }
.avatar.deep { background: var(--primary-deeper); }
.review-author .name { font-size: 14px; font-weight: 700; color: var(--text); }
.review-author .role { font-size: 12px; color: var(--text-muted); }

/* =========================================================
   FAQ 手风琴
   ========================================================= */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item.open { border-color: #B9CDF0; box-shadow: var(--shadow-sm); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: none;
  border: 0;
  padding: 20px 24px;
  text-align: left;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.faq-q .plus {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform 0.25s ease, background 0.25s ease;
}
.faq-item.open .plus { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-a-inner { padding: 0 24px 22px; font-size: 14.5px; color: var(--text-secondary); }
.faq-a-inner ul { margin-top: 10px; }
.faq-a-inner li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 6px;
}
.faq-a-inner li::before {
  content: "";
  position: absolute;
  left: 0; top: 11px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-strong);
}

/* =========================================================
   CTA 区
   ========================================================= */
.cta-band {
  position: relative;
  overflow: hidden;
  background: var(--grad-primary);
  border-radius: 24px;
  padding: 64px 48px;
  text-align: center;
  color: #fff;
}
.cta-band::before, .cta-band::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}
.cta-band::before {
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(61,222,237,0.3) 0%, rgba(61,222,237,0) 70%);
  top: -140px; left: -80px;
}
.cta-band::after {
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(61,222,237,0.22) 0%, rgba(61,222,237,0) 70%);
  bottom: -130px; right: -60px;
}
.cta-band h2 {
  position: relative;
  z-index: 2;
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  margin-bottom: 14px;
}
.cta-band p {
  position: relative;
  z-index: 2;
  color: rgba(255,255,255,0.82);
  font-size: 16.5px;
  max-width: 620px;
  margin: 0 auto 34px;
}
.cta-band .btn-group {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.cta-meta {
  position: relative;
  z-index: 2;
  margin-top: 26px;
  font-size: 13px;
  color: rgba(255,255,255,0.62);
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  justify-content: center;
}
.cta-meta span { display: inline-flex; align-items: center; gap: 7px; }
.cta-meta svg { color: var(--accent); }

/* =========================================================
   内页 Hero（次级页面共用）
   ========================================================= */
.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--grad-primary);
  color: #fff;
  padding: 84px 0 72px;
}
.page-hero::after {
  content: "";
  position: absolute;
  top: -180px; right: -140px;
  width: 480px; height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61,222,237,0.25) 0%, rgba(61,222,237,0) 68%);
}
.page-hero .crumb {
  position: relative;
  z-index: 2;
  font-size: 13.5px;
  color: rgba(255,255,255,0.65);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-hero .crumb a { color: rgba(255,255,255,0.85); }
.page-hero .crumb a:hover { color: var(--accent); }
.page-hero h1 {
  position: relative;
  z-index: 2;
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 14px;
}
.page-hero .lead {
  position: relative;
  z-index: 2;
  max-width: 680px;
  font-size: 17px;
  color: rgba(255,255,255,0.82);
}
.page-updated {
  position: relative;
  z-index: 2;
  margin-top: 14px;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}
.page-updated time { color: var(--accent); }

/* =========================================================
   表格（下载中心版本表）
   ========================================================= */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}
.version-table { width: 100%; border-collapse: collapse; min-width: 720px; }
.version-table th {
  text-align: left;
  padding: 15px 20px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.version-table td {
  padding: 16px 20px;
  font-size: 14.5px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.version-table tr:last-child td { border-bottom: 0; }
.version-table tr:hover td { background: #FAFBFE; }
.version-name { font-weight: 700; color: var(--text); white-space: nowrap; }
.version-date { color: var(--text-secondary); white-space: nowrap; }
.version-dl { color: var(--text-muted); white-space: nowrap; }

/* =========================================================
   步骤（使用指南）
   ========================================================= */
.steps { counter-reset: step; display: grid; gap: 18px; }
.step-card {
  position: relative;
  display: flex;
  gap: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
}
.step-num {
  counter-increment: step;
  width: 46px; height: 46px;
  border-radius: 14px;
  background: var(--grad-cta);
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 8px 16px rgba(13,71,161,0.25);
}
.step-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.step-card p { font-size: 14.5px; color: var(--text-secondary); }
.step-card kbd {
  display: inline-block;
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid #CBD8EF;
  border-bottom-width: 3px;
  border-radius: 6px;
  padding: 2px 9px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  font-weight: 600;
  margin: 0 2px;
}

/* 快捷键速查表 */
.hotkey-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.hotkey-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
}
.hotkey-item .hk-desc { font-size: 14px; font-weight: 600; color: var(--text); }
.hotkey-item .hk-keys { display: flex; gap: 4px; align-items: center; }

/* 下载选项卡片 */
.dl-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.dl-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.dl-card .dl-ic {
  width: 60px; height: 60px;
  border-radius: 16px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.dl-card .dl-ic.sand { background: #F0EEE8; color: #6B6350; }
.dl-card .dl-ic.green { background: #E2F5EC; color: var(--success); }
.dl-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.dl-card p { font-size: 13.5px; color: var(--text-secondary); margin-bottom: 18px; flex: 1; }

/* =========================================================
   移动端吸底下载条（转化增强）
   ========================================================= */
.sticky-dlbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
  box-shadow: 0 -8px 24px rgba(7, 41, 94, 0.12);
  padding: 10px 0;
  display: none;
}
.sticky-dlbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.sticky-dlbar-info { display: flex; flex-direction: column; line-height: 1.35; }
.sticky-dlbar-info strong { font-size: 14.5px; font-weight: 700; color: var(--text); }
.sticky-dlbar-info span { font-size: 12px; color: var(--text-muted); }
.sticky-dlbar .btn { min-width: 128px; padding: 11px 26px; }
@media (max-width: 768px) {
  .sticky-dlbar { display: block; }
  body { padding-bottom: 74px; }
}
@media (max-width: 480px) {
  .sticky-dlbar .btn { width: auto; flex: none; }
}

/* =========================================================
   弹窗（下载中心）
   ========================================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(7, 41, 94, 0.62);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.modal-overlay.is-open { display: flex; animation: fadeIn 0.22s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  width: 100%;
  max-width: 620px;
  max-height: 92vh;
  overflow-y: auto;
  background: #fff;
  border-radius: 22px;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(26px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-head {
  position: relative;
  padding: 30px 32px 0;
  text-align: center;
}
.modal-close {
  position: absolute;
  top: 18px; right: 18px;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 0;
  background: var(--bg-alt);
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  transition: background 0.16s ease, color 0.16s ease, transform 0.16s ease;
}
.modal-close:hover { background: var(--primary); color: #fff; transform: rotate(90deg); }
.modal-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.modal-title .title-ic {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: var(--grad-cta);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
}
.modal-sub {
  margin-top: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}
.modal-sub .badge { margin: 0 3px; }

.modal-qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding: 26px 32px 6px;
}
.qr-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 18px 18px;
  text-align: center;
  background: var(--bg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.qr-card:hover { border-color: #B9CDF0; box-shadow: var(--shadow-sm); }
.qr-box {
  width: 168px;
  height: 168px;
  margin: 0 auto 14px;
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.qr-box canvas, .qr-box img { border-radius: 6px; }
.qr-card h4 { font-size: 15px; font-weight: 700; color: var(--text); }
.qr-card p { font-size: 12.5px; color: var(--text-muted); margin-top: 4px; }
.qr-card .qr-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 4px 12px;
  border-radius: 999px;
}

.modal-actions {
  padding: 18px 32px 8px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.modal-note {
  padding: 4px 32px 30px;
  font-size: 12.5px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.8;
}
.modal-note svg { vertical-align: -2px; }

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  background: #0A2347;
  color: rgba(255,255,255,0.72);
  margin-top: 0;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 44px;
  padding: 64px 0 44px;
}
.footer-brand img { height: 70px; width: auto; margin-bottom: 18px; filter: brightness(0) invert(1); opacity: 0.95; }
.footer-brand p { font-size: 14px; line-height: 1.9; max-width: 300px; }
.footer-col h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 18px;
}
.footer-col ul li { margin-bottom: 11px; }
.footer-col ul a { color: rgba(255,255,255,0.68); font-size: 14px; transition: color 0.16s ease; }
.footer-col ul a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255,255,255,0.62);
}
.footer-bottom .links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-bottom .links a { color: rgba(255,255,255,0.62); font-size: 13px; }
.footer-bottom .links a:hover { color: var(--accent); }

/* =========================================================
   滚动显现动画
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* =========================================================
   关于页
   ========================================================= */
.info-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
}
.info-card .ic {
  width: 46px; height: 46px;
  margin: 0 auto 12px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.info-card .k { font-size: 13px; color: var(--text-muted); }
.info-card .v { font-size: 15px; font-weight: 700; color: var(--text); margin-top: 2px; }

.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 2px;
}
.timeline li { position: relative; padding-bottom: 26px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -26px; top: 7px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--primary);
}
.timeline .t-date { font-size: 13px; font-weight: 700; color: var(--primary); }
.timeline .t-title { font-size: 15.5px; font-weight: 700; color: var(--text); margin: 2px 0 4px; }
.timeline .t-desc { font-size: 13.5px; color: var(--text-secondary); }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 992px) {
  .hero-grid { grid-template-columns: 1fr; gap: 64px; }
  .hero-visual { order: -1; }
  .feature-grid, .review-grid { grid-template-columns: repeat(2, 1fr); }
  .dl-options, .hotkey-list { grid-template-columns: repeat(2, 1fr); }
  .data-strip-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .data-divider { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .info-grid { grid-template-columns: repeat(2, 1fr); }
  .chip-1 { left: 4px; }
  .chip-2 { right: 4px; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav-links {
    position: absolute;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 16px 24px 22px;
    display: none;
    box-shadow: 0 20px 40px rgba(7,41,94,0.12);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; }
  .nav-cta { margin-left: 0; }
  .nav-toggle { display: flex; }
  .scenario-grid { grid-template-columns: 1fr; }
  .feature-grid, .review-grid { grid-template-columns: 1fr; }
  .dl-options, .hotkey-list { grid-template-columns: 1fr; }
  .modal-qr-grid { grid-template-columns: 1fr; }
  .modal-actions { grid-template-columns: 1fr; }
  .cta-band { padding: 48px 26px; }
  .footer-top { grid-template-columns: 1fr; gap: 34px; }
  .step-card { flex-direction: column; gap: 14px; }
  .hero { padding: 72px 0 80px; }
}

@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr; }
  .btn { width: 100%; }
  .hero-actions .btn { width: auto; flex: 1; min-width: 0; }
}

/* =========================================================
   暗色模式（跟随系统 prefers-color-scheme）
   ========================================================= */
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #5B8DEF;
    --primary-dark: #3A6CD8;
    --primary-deeper: #274E9E;
    --primary-soft: #14294D;
    --link-blue: #7FB0F0;
    --bg: #0D1524;
    --bg-alt: #131E33;
    --surface: #17243D;
    --text: #E8EDF7;
    --text-secondary: #A9B7CC;
    --text-muted: #7E8EA9;
    --border: #24354F;
    --success: #3ECF96;
    --warning: #EFA54B;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
  }
  body { background: var(--bg); }

  .site-header {
    background: rgba(13, 21, 36, 0.92);
    border-bottom-color: var(--border);
  }
  .brand img { filter: brightness(0) invert(1); }
  .nav-links a { color: var(--text); }
  .nav-links a:hover { color: #BBD0F5; background: var(--primary-soft); }
  .nav-links a.active { color: #fff; background: var(--primary); }
  .nav-toggle span { background: var(--text); }

  .data-strip { background: var(--surface); border-bottom-color: var(--border); }
  .data-item .num { color: var(--primary); }
  .anchor-nav { background: var(--surface); border-bottom-color: var(--border); }
  .anchor-nav a { background: var(--bg-alt); border-color: var(--border); color: var(--text-secondary); }
  .anchor-nav a:hover { color: #fff; background: var(--primary); border-color: var(--primary); }

  .app-card { background: var(--surface); color: var(--text); }
  .app-card-head { border-bottom-color: var(--border); }
  .app-card-title { color: var(--text-secondary); }
  .app-row:hover { background: rgba(255, 255, 255, 0.05); }
  .app-row + .app-row { border-top-color: var(--border); }
  .tag-off { background: var(--bg-alt); color: var(--text-muted); }
  .app-hint { background: var(--primary-soft); color: #BBD0F5; }
  .app-hint kbd { background: #1C2E4F; border-color: #2E4163; color: #8FD6E8; }
  .float-chip { background: var(--surface); color: var(--text); }
  .float-chip small { color: var(--text-muted); }

  .feature-card, .scenario-card, .review-card, .dl-card,
  .hotkey-item, .info-card, .review-summary, .faq-item { background: var(--surface); }
  .feature-card:hover, .scenario-card:hover, .review-card:hover,
  .dl-card:hover { border-color: #2E4163; }
  .feature-card:hover::before { transform: scaleX(1); }
  .feature-ic { box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35); }

  .scenario-body p, .feature-card p, .dl-card p { color: var(--text-secondary); }
  .scenario-foot { border-top-color: var(--border); color: var(--text-muted); }

  .version-table th { background: var(--bg-alt); color: var(--text-muted); }
  .version-table td { border-bottom-color: var(--border); }
  .version-table tr:hover td { background: rgba(255, 255, 255, 0.03); }
  .version-date { color: var(--text-secondary); }
  .version-dl { color: var(--text-muted); }

  .step-card { background: var(--surface); }
  .step-card p { color: var(--text-secondary); }
  .step-card kbd, .hotkey-item kbd {
    background: var(--primary-soft);
    color: #BBD0F5;
    border-color: #2E4163;
  }
  .hotkey-item .hk-desc { color: var(--text); }

  .modal { background: var(--surface); }
  .modal-close { background: var(--bg-alt); color: var(--text-secondary); }
  .modal-close:hover { background: var(--primary); color: #fff; }
  .qr-card { background: var(--bg-alt); border-color: var(--border); }
  .qr-card:hover { border-color: #2E4163; }
  .qr-box { background: #ffffff; }
  .qr-card p { color: var(--text-muted); }
  .qr-tag { background: var(--primary-soft); color: #BBD0F5; }

  .sticky-dlbar {
    background: rgba(23, 36, 61, 0.97);
    border-top-color: var(--border);
  }
  .sticky-dlbar-info strong { color: var(--text); }

  .faq-q { color: var(--text); }
  .faq-item.open { border-color: #2E4163; }
  .faq-a-inner { color: var(--text-secondary); }

  .section-alt { background: var(--surface); }
  .cta-meta, .hero-note { color: rgba(255, 255, 255, 0.68); }

  .timeline li::before { background: var(--surface); }
  .timeline .t-desc { color: var(--text-secondary); }
}