/* ============================================================
   野果视频 App 下载页 - 全局样式
   结构：变量 → 基础 → 通用组件 → 顶部/首屏 → 各内容区块 → 页脚 → 响应式
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --c-primary: #16a34a;
  --c-primary-dark: #15803d;
  --c-primary-light: #22c55e;
  --c-primary-soft: #f0fdf4;
  --c-primary-line: #bbf7d0;

  --c-ink: #0f172a;
  --c-text: #334155;
  --c-muted: #64748b;
  --c-faint: #94a3b8;
  --c-border: #e2e8f0;
  --c-bg: #ffffff;
  --c-bg-soft: #f7faf8;
  --c-bg-dark: #0b1f14;

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow: 0 10px 30px -12px rgba(15, 23, 42, .18);
  --shadow-lg: 0 24px 60px -20px rgba(21, 128, 61, .35);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --header-h: 64px;
}

/* ---------- 基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  color: var(--c-ink);
  line-height: 1.35;
  margin: 0 0 .6em;
  font-weight: 700;
}

p { margin: 0 0 1em; }

a { color: var(--c-primary-dark); text-decoration: none; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}
.container.narrow { max-width: 860px; }

.section { padding: 72px 0; }
.section:nth-of-type(even) { background: var(--c-bg-soft); }

.section-title {
  font-size: clamp(24px, 3.4vw, 34px);
  text-align: center;
  margin-bottom: 12px;
}
.section-title.left { text-align: left; }

.section-sub {
  text-align: center;
  color: var(--c-muted);
  max-width: 640px;
  margin: 0 auto 40px;
}
.section-sub.left { text-align: left; margin-left: 0; }

.sub-title {
  font-size: 20px;
  margin: 48px 0 20px;
}

.icon { width: 1.15em; height: 1.15em; flex: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  line-height: 1.2;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px) scale(.99); }

.btn-primary {
  background: linear-gradient(135deg, var(--c-primary-light), var(--c-primary-dark));
  color: #fff;
  box-shadow: 0 10px 24px -10px rgba(22, 163, 74, .65);
}
.btn-primary:hover { box-shadow: 0 14px 30px -10px rgba(22, 163, 74, .75); transform: translateY(-1px); }

.btn-light {
  background: #fff;
  color: var(--c-primary-dark);
  box-shadow: 0 10px 24px -12px rgba(2, 44, 20, .45);
}
.btn-light:hover { transform: translateY(-1px); }

.btn-ghost {
  background: rgba(255, 255, 255, .8);
  border-color: var(--c-border);
  color: var(--c-ink);
}
.btn-ghost:hover { border-color: var(--c-primary); color: var(--c-primary-dark); }

.btn-lg { padding: 15px 32px; font-size: 16px; }
.btn-sm { padding: 9px 18px; font-size: 14px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--header-h);
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--c-border);
  box-shadow: 0 6px 20px -14px rgba(15, 23, 42, .3);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--c-ink);
  font-size: 18px;
  flex: none;
}
.brand-logo { display: inline-flex; border-radius: 9px; box-shadow: 0 4px 12px -4px rgba(21, 128, 61, .5); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.main-nav a {
  padding: 8px 12px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--c-text);
  border-radius: 8px;
  transition: color .18s, background .18s;
}
.main-nav a:hover { color: var(--c-primary-dark); background: var(--c-primary-soft); }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.main-nav + .header-actions { margin-left: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: 10px;
  cursor: pointer;
}
.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--c-ink);
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 首屏 Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 80px;
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(34, 197, 94, .18), transparent 60%),
    radial-gradient(700px 420px at -10% 20%, rgba(34, 197, 94, .12), transparent 55%),
    linear-gradient(180deg, #f4fdf6 0%, #ffffff 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(22, 163, 74, .07) 0 8px, transparent 8px),
    radial-gradient(circle at 78% 30%, rgba(22, 163, 74, .07) 0 6px, transparent 6px);
  background-size: 220px 220px, 260px 260px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 56px;
}

.hero-brand { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.hero-logo { display: inline-flex; border-radius: 14px; box-shadow: 0 14px 30px -12px rgba(21, 128, 61, .55); }
.hero-brand-name { font-size: 22px; font-weight: 800; color: var(--c-ink); letter-spacing: .5px; }

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  letter-spacing: -.5px;
  margin-bottom: 14px;
}

.hero-sub {
  font-size: clamp(17px, 2vw, 21px);
  color: var(--c-text);
  font-weight: 600;
  margin-bottom: 6px;
}

.hero-tags { color: var(--c-muted); margin-bottom: 30px; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 18px; }

.hero-safe {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--c-primary-dark);
  font-size: 14.5px;
  font-weight: 600;
  margin-bottom: 26px;
}

.hero-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.hero-platforms li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  background: #fff;
  border: 1px solid var(--c-border);
  color: var(--c-text);
}
.hero-platforms li span { color: var(--c-muted); font-weight: 500; }
.hero-platforms li.ok { border-color: var(--c-primary-line); background: var(--c-primary-soft); color: var(--c-primary-dark); }
.hero-platforms li.ok span { color: var(--c-primary); }
.hero-platforms li.later { opacity: .82; }

/* 手机模型 */
.hero-visual { position: relative; display: flex; justify-content: center; }

.phone-mockup {
  position: relative;
  width: min(300px, 78vw);
  border-radius: 40px;
  padding: 12px;
  background: linear-gradient(160deg, #1e293b, #0f172a);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, .06) inset;
}
.phone-mockup::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 34px;
  border: 1px solid rgba(255, 255, 255, .12);
  pointer-events: none;
}
.phone-mockup img {
  border-radius: 28px;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  width: 100%;
}
.phone-notch {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 86px;
  height: 22px;
  background: #0f172a;
  border-radius: 999px;
  z-index: 2;
}
.phone-glare {
  position: absolute;
  inset: 12px;
  border-radius: 28px;
  background: linear-gradient(115deg, rgba(255, 255, 255, .22) 0%, rgba(255, 255, 255, 0) 34%);
  pointer-events: none;
}
.phone-mockup.small { width: min(250px, 62vw); }

.hero-badge {
  position: absolute;
  right: max(4px, calc(50% - 260px));
  bottom: 44px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: floatY 4.5s ease-in-out infinite;
}
.hero-badge strong { color: var(--c-ink); font-size: 16px; }
.hero-badge span { color: var(--c-primary-dark); font-size: 13px; font-weight: 600; }
.hero-badge em { font-style: normal; color: var(--c-muted); font-size: 12px; }

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 平台支持 ---------- */
.platform-section { padding: 64px 0; }

.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.platform-card {
  padding: 26px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: #fff;
  text-align: center;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.platform-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.platform-card.supported { border-color: var(--c-primary-line); background: linear-gradient(180deg, var(--c-primary-soft), #fff); }

.platform-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 14px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
}
.platform-card:not(.supported) .platform-icon { background: #f1f5f9; color: var(--c-faint); }
.platform-icon svg { width: 28px; height: 28px; }

.platform-card h3 { font-size: 19px; margin-bottom: 6px; }
.platform-card p { margin-bottom: 6px; }

.status { font-weight: 700; font-size: 15px; }
.status-yes { color: var(--c-primary-dark); }
.status-no { color: var(--c-faint); }

.platform-note { color: var(--c-muted); font-size: 13.5px; margin-bottom: 0; }

/* ---------- 野果视频是什么 ---------- */
.about-text { font-size: 17px; color: var(--c-text); }

.about-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 28px;
}
.about-point {
  padding: 18px 20px;
  border-left: 3px solid var(--c-primary);
  background: var(--c-primary-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.about-point strong { display: block; color: var(--c-ink); font-size: 16px; margin-bottom: 2px; }
.about-point span { color: var(--c-muted); font-size: 14px; }

/* ---------- 功能卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px 24px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-primary-line);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 50px;
  height: 50px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--c-primary-light), var(--c-primary-dark));
  color: #fff;
  margin-bottom: 18px;
  box-shadow: 0 10px 20px -10px rgba(22, 163, 74, .6);
}
.feature-icon svg { width: 26px; height: 26px; }

.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { color: var(--c-muted); font-size: 14.5px; margin: 0; }

/* ---------- App 截图展示 ---------- */
.screenshots { padding-bottom: 80px; }

.shots-wrap { position: relative; }

.shots-scroller {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 8px max(20px, calc((100% - 1120px) / 2 + 20px)) 20px;
  scrollbar-width: none;
  -ms-overflow-style: none;
  cursor: grab;
}
.shots-scroller::-webkit-scrollbar { display: none; }
.shots-scroller.dragging { cursor: grabbing; scroll-snap-type: none; }
.shots-scroller:focus-visible { outline: 2px solid var(--c-primary); outline-offset: -2px; }

.shot {
  flex: 0 0 auto;
  scroll-snap-align: center;
  width: clamp(230px, 24vw, 268px);
  margin: 0;
}

.shot-frame {
  border-radius: var(--radius-lg);
  padding: 10px;
  background: linear-gradient(160deg, #1e293b, #0f172a);
  box-shadow: var(--shadow);
  transition: transform .25s ease;
}
.shot:hover .shot-frame { transform: translateY(-6px); }
.shot-frame img {
  border-radius: 16px;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  width: 100%;
}

.shot figcaption {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  margin-top: 14px;
  text-align: center;
}
.shot figcaption strong { color: var(--c-ink); font-size: 15.5px; }
.shot figcaption span { color: var(--c-muted); font-size: 13.5px; }

.shots-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 12px;
}

.shots-arrow {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  color: var(--c-ink);
  cursor: pointer;
  transition: border-color .2s, color .2s, box-shadow .2s;
}
.shots-arrow:hover { border-color: var(--c-primary); color: var(--c-primary-dark); box-shadow: var(--shadow-sm); }
.shots-arrow svg { width: 20px; height: 20px; }

.shots-dots { display: flex; gap: 8px; }
.shots-dots button {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: #cbd5e1;
  cursor: pointer;
  transition: width .25s, background .25s;
}
.shots-dots button.active { width: 22px; background: var(--c-primary); }

/* ---------- 下载转化横幅 ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--c-primary-dark), var(--c-primary-light));
  padding: 44px 0;
}

.cta-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.cta-band-copy h2 { color: #fff; font-size: clamp(22px, 3vw, 30px); margin-bottom: 6px; }
.cta-band-copy p { color: rgba(255, 255, 255, .88); margin: 0; }

/* ---------- 版本信息 ---------- */
.version-card {
  max-width: 760px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 32px;
}

.version-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--c-border);
  margin-bottom: 22px;
}

.version-app { display: flex; align-items: center; gap: 16px; }
.version-logo { display: inline-flex; border-radius: 12px; box-shadow: 0 8px 18px -8px rgba(21, 128, 61, .55); }
.version-app h3 { margin: 0; font-size: 21px; }
.version-app p { margin: 0; color: var(--c-muted); font-size: 14px; }

.version-pill {
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  border: 1px solid var(--c-primary-line);
  font-weight: 700;
  font-size: 15px;
}

.version-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px 32px;
  margin: 0 0 26px;
}
.version-meta > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--c-border);
}
.version-meta dt { color: var(--c-muted); font-size: 14.5px; flex: none; }
.version-meta dd { margin: 0; color: var(--c-ink); font-weight: 600; font-size: 15px; text-align: right; }

.version-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.version-tip {
  margin: 18px 0 0;
  text-align: center;
  color: var(--c-muted);
  font-size: 13.5px;
}

/* ---------- 更新日志 ---------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-primary), var(--c-primary-line), transparent);
  border-radius: 2px;
}

.timeline-item { position: relative; padding: 0 0 34px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: #fff;
  border: 4px solid var(--c-primary);
  box-shadow: 0 0 0 4px rgba(34, 197, 94, .15);
}

.timeline-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.timeline-version { font-size: 18px; font-weight: 800; color: var(--c-ink); }
.timeline-date { color: var(--c-muted); font-size: 14px; }
.timeline-badge {
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--c-primary-light), var(--c-primary-dark));
  border-radius: 999px;
}

.timeline-list { margin: 0; padding-left: 20px; color: var(--c-text); }
.timeline-list li { margin-bottom: 4px; }

/* ---------- 安装教程 ---------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  counter-reset: step;
}

.step {
  position: relative;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 26px 24px 22px;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.step:hover { transform: translateY(-3px); border-color: var(--c-primary-line); box-shadow: var(--shadow); }

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 13px;
  font-weight: 800;
  font-size: 17px;
  color: #fff;
  background: linear-gradient(135deg, var(--c-primary-light), var(--c-primary-dark));
  margin-bottom: 16px;
  box-shadow: 0 10px 20px -10px rgba(22, 163, 74, .6);
}
.step h3 { font-size: 17px; margin-bottom: 6px; }
.step p { color: var(--c-muted); font-size: 14.5px; margin: 0; }

/* ---------- 未知来源 / 品牌指南 ---------- */
.source-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}
.source-step {
  padding: 10px 20px;
  background: #fff;
  border: 1px solid var(--c-primary-line);
  border-radius: 999px;
  color: var(--c-primary-dark);
  font-weight: 600;
  font-size: 14.5px;
  box-shadow: var(--shadow-sm);
}
.source-arrow { color: var(--c-primary); font-weight: 700; }

.brand-guides {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.brand-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.brand-item[open] { border-color: var(--c-primary-line); box-shadow: var(--shadow-sm); }

.brand-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 22px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--c-ink);
}
.brand-item summary::-webkit-details-marker { display: none; }
.brand-name-text { font-size: 16px; }
.brand-action {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--c-primary-dark);
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.brand-action::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  transition: transform .25s;
}
.brand-item[open] .brand-action::after { transform: rotate(-135deg) translateY(-2px); }

.brand-body { padding: 0 22px 20px; color: var(--c-muted); font-size: 14.5px; }
.brand-body p { margin: 0; }

/* ---------- 扫码下载 ---------- */
.qr-section { background: linear-gradient(180deg, #fff, var(--c-primary-soft)); }

.qr-inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  align-items: center;
  gap: 56px;
}

.qr-visual { display: flex; justify-content: center; }

.qr-box {
  display: flex;
  align-items: center;
  gap: 22px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 16px;
}

.qr-canvas-wrap {
  flex: none;
  width: 200px;
  height: 200px;
  display: grid;
  place-items: center;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #fff;
}
.qr-canvas-wrap canvas { width: 100%; height: 100%; display: block; }
.qr-canvas-wrap img { width: 100%; height: 100%; object-fit: contain; }

.qr-info { display: flex; flex-direction: column; gap: 6px; }
.qr-info strong { color: var(--c-ink); font-size: 17px; }
.qr-info span { color: var(--c-muted); font-size: 14px; }

.qr-tip { color: var(--c-muted); font-size: 14px; }

/* ---------- 安全下载 ---------- */
.safety-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}

.safety-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px 22px;
}
.safety-item h3 { font-size: 16.5px; margin: 12px 0 6px; }
.safety-item p { color: var(--c-muted); font-size: 14px; margin: 0; }

.safety-check {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  border: 1px solid var(--c-primary-line);
  font-weight: 800;
}

.hash-box {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  background: #0f172a;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 14px;
}
.hash-label { color: #94a3b8; font-size: 13.5px; font-weight: 600; flex: none; }
.hash-box code {
  flex: 1;
  min-width: 200px;
  color: #86efac;
  font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  word-break: break-all;
  line-height: 1.5;
}
.hash-copy {
  flex: none;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
  color: #0f172a;
  background: #fff;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s;
}
.hash-copy:hover { background: #d1fae5; }

.safety-note { color: var(--c-muted); font-size: 14px; margin: 0; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.faq-item[open] { border-color: var(--c-primary-line); box-shadow: var(--shadow-sm); }

.faq-item summary {
  position: relative;
  padding: 19px 56px 19px 22px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--c-ink);
  font-size: 16.5px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "";
  position: absolute;
  right: 24px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--c-primary);
  border-bottom: 2px solid var(--c-primary);
  transform: translateY(-70%) rotate(45deg);
  transition: transform .25s;
}
.faq-item[open] summary::after { transform: translateY(-30%) rotate(-135deg); }

.faq-body { padding: 0 22px 20px; color: var(--c-muted); }
.faq-body p { margin: 0; }

/* ---------- 底部转化 ---------- */
.final-cta {
  background:
    radial-gradient(700px 320px at 80% -20%, rgba(134, 239, 172, .25), transparent 60%),
    linear-gradient(135deg, #14532d, #15803d 55%, #22c55e);
  padding: 84px 0;
  text-align: center;
}

.final-cta-inner { display: flex; flex-direction: column; align-items: center; }
.final-cta h2 { color: #fff; font-size: clamp(26px, 4vw, 38px); margin-bottom: 10px; }
.final-cta p { color: rgba(255, 255, 255, .88); margin-bottom: 28px; }
.final-note { margin: 20px 0 0; color: rgba(255, 255, 255, .72); font-size: 14px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-bg-dark); color: #cbd5e1; padding: 56px 0 28px; }

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}

.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { color: #94a3b8; font-size: 14px; margin: 0; max-width: 340px; }

.footer-nav { display: flex; flex-direction: column; gap: 10px; }
.footer-nav h3 { color: #fff; font-size: 15px; margin-bottom: 6px; }
.footer-nav a { color: #94a3b8; font-size: 14px; transition: color .18s; }
.footer-nav a:hover { color: #86efac; }

.footer-bottom {
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-bottom p { margin: 0; color: #7c8ea3; font-size: 13.5px; }
.footer-meta { color: #94a3b8; }

/* ---------- 移动端吸底下载条 ---------- */
.sticky-download {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px calc(12px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid var(--c-border);
  box-shadow: 0 -8px 24px -16px rgba(15, 23, 42, .4);
  transform: translateY(110%);
  transition: transform .3s ease;
}
.sticky-download.visible { transform: translateY(0); }
.sticky-download[hidden] { display: none; }

.sticky-info { display: flex; flex-direction: column; line-height: 1.4; min-width: 0; }
.sticky-info strong { color: var(--c-ink); font-size: 15px; }
.sticky-info span { color: var(--c-muted); font-size: 12.5px; }

/* ---------- 提示 Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 96px;
  z-index: 90;
  transform: translate(-50%, 16px);
  max-width: min(90vw, 420px);
  padding: 12px 22px;
  background: rgba(15, 23, 42, .92);
  color: #fff;
  font-size: 14px;
  border-radius: 999px;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, transform .25s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.in-view { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-badge { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner { gap: 36px; }
  .hero-badge { right: 0; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .safety-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .qr-inner { gap: 36px; }
}

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    box-shadow: 0 24px 40px -24px rgba(15, 23, 42, .35);
    padding: 10px 16px 16px;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform .25s, opacity .25s, visibility .25s;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .main-nav a { padding: 13px 12px; border-radius: 10px; font-size: 15.5px; }

  .nav-toggle { display: inline-flex; }
  .header-actions .btn { display: none; }

  .hero { padding: 40px 0 56px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero-brand { justify-content: center; }
  .hero-cta { justify-content: center; }
  .hero-safe { justify-content: center; }
  .hero-platforms { justify-content: center; }
  .hero-visual { order: 2; }
  .hero-badge {
    right: auto;
    left: 50%;
    bottom: 24px;
    transform: translateX(20%);
    animation: none;
    padding: 12px 16px;
  }

  .qr-inner { grid-template-columns: 1fr; }
  .qr-visual { order: 2; }
  .qr-copy { order: 1; }
  .section-title.left, .section-sub.left { text-align: center; }
  .section-sub.left { margin-left: auto; }

  .brand-guides { grid-template-columns: 1fr; }
  .about-points { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* 桌面端不展示吸底下载条 */
@media (min-width: 861px) {
  .sticky-download { display: none; }
}

@media (max-width: 640px) {
  .section { padding: 56px 0; }

  .platform-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .safety-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .version-meta { grid-template-columns: 1fr; }
  .version-card { padding: 24px 20px; }
  .version-card-head { flex-direction: column; align-items: flex-start; }

  .btn-lg { padding: 14px 26px; font-size: 15.5px; width: 100%; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }

  .cta-band-inner { flex-direction: column; text-align: center; }

  .qr-box { flex-direction: column; text-align: center; }
  .qr-info { align-items: center; }

  .shot { width: 76vw; }

  .final-cta { padding: 64px 0; }

  .toast { bottom: 104px; }
}

@media (max-width: 400px) {
  .container { padding: 0 16px; }
  .hero-platforms li { font-size: 12.5px; padding: 6px 12px; }
}