/* =========================================================
   17c官网入口 · 全站设计系统 style.css
   分区：1 变量 → 2 重置 → 3 布局工具 → 4 标题组件 → 5 按钮
   → 6 头部导航 → 7 卡片 → 8 Hero → 9 跑马灯 → 10 视频卡
   → 11 榜单 → 12 话题/文章列表 → 13 数据/特性 → 14 评价
   → 15 CTA/下载 → 16 FAQ → 17 提示条/弹层 → 18 页脚
   → 19 内页页头 → 20 分页 → 21 滚动动画 → 22 响应式
   → 23 附加组件（含自身媒体查询）
   ========================================================= */

/* ---------- 1 设计变量 ---------- */
:root {
  --rose: #ff4d6d;
  --rose-deep: #e63b5c;
  --violet: #6c4bff;
  --melon: #ffd6dd;
  --mint: #2dd4a7;

  --ink: #17141f;
  --ink-2: #2a2438;
  --text: #37303f;
  --muted: #7c7488;
  --line: #efe7ee;
  --paper: #fffaf7;
  --card: #ffffff;

  --grad-main: linear-gradient(135deg, #ff4d6d 0%, #ff7a59 55%, #ffb347 100%);
  --grad-cool: linear-gradient(135deg, #6c4bff 0%, #a06bff 100%);
  --grad-soft: linear-gradient(160deg, #fff1f0 0%, #fdf3ff 60%, #f2f7ff 100%);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;
  --r-pill: 999px;

  --sh-sm: 0 2px 8px rgba(40, 20, 60, 0.06);
  --sh-md: 0 10px 28px rgba(40, 20, 60, 0.1);
  --sh-lg: 0 22px 54px rgba(40, 20, 60, 0.14);
  --sh-rose: 0 12px 30px rgba(255, 77, 109, 0.32);
  --sh-violet: 0 12px 30px rgba(108, 75, 255, 0.28);

  --fs-xs: clamp(0.78rem, 0.74rem + 0.2vw, 0.85rem);
  --fs-sm: clamp(0.88rem, 0.84rem + 0.2vw, 0.95rem);
  --fs-base: clamp(0.98rem, 0.94rem + 0.25vw, 1.06rem);
  --fs-lg: clamp(1.12rem, 1.02rem + 0.5vw, 1.3rem);
  --fs-xl: clamp(1.35rem, 1.15rem + 1vw, 1.75rem);
  --fs-2xl: clamp(1.7rem, 1.35rem + 1.8vw, 2.5rem);
  --fs-hero: clamp(2.1rem, 1.4rem + 3.6vw, 3.6rem);

  --container: 1180px;
  --gutter: clamp(16px, 4vw, 32px);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: "Outfit", "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; }

h1, h2, h3, h4, h5 {
  color: var(--ink);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: 0.01em;
}

::selection { background: var(--melon); color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--violet);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 3 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 8vw, 96px); }
.section-tight { padding-block: clamp(40px, 6vw, 64px); }

.section-alt { background: var(--grad-soft); }
.section-ink { background: var(--ink); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

/* 主侧栏布局（勿用内联 grid-template-columns） */
.grid-side {
  display: grid;
  grid-template-columns: 1.6fr 0.8fr;
  gap: 32px;
  align-items: start;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-group { display: flex; gap: 14px; flex-wrap: wrap; }

.muted { color: var(--muted); }
.center { text-align: center; }

/* ---------- 4 文字标题组件 ---------- */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rose);
  background: #fff0f3;
  border: 1px solid #ffd6dd;
  border-radius: var(--r-pill);
  padding: 6px 16px;
  margin-bottom: 16px;
}

.kicker--cool { color: var(--violet); background: #f1edff; border-color: #ded4ff; }
.kicker--ink { color: #ffd6dd; background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.16); }

.section-head { max-width: 720px; margin-bottom: clamp(28px, 4vw, 48px); }
.section-head.center { margin-inline: auto; }
.section-head h2 { font-size: var(--fs-2xl); margin-bottom: 12px; }
.section-head p { color: var(--muted); font-size: var(--fs-lg); }

.hl {
  position: relative;
  z-index: 0;
  white-space: nowrap;
}
.hl::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: 0.08em;
  height: 0.42em;
  background: var(--melon);
  border-radius: 4px;
  z-index: -1;
}

/* ---------- 5 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--r-pill);
  font-weight: 700;
  font-size: var(--fs-sm);
  line-height: 1.2;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
  will-change: transform;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--grad-main); color: #fff; box-shadow: var(--sh-rose); }
.btn-primary:hover { box-shadow: 0 16px 38px rgba(255, 77, 109, 0.42); }

.btn-cool { background: var(--grad-cool); color: #fff; box-shadow: var(--sh-violet); }

.btn-ghost {
  background: #fff;
  color: var(--ink);
  border: 1.5px solid var(--line);
  box-shadow: var(--sh-sm);
}
.btn-ghost:hover { border-color: var(--rose); color: var(--rose); }

.btn-ghost-light { background: rgba(255, 255, 255, 0.08); color: #fff; border: 1.5px solid rgba(255, 255, 255, 0.28); }
.btn-ghost-light:hover { background: rgba(255, 255, 255, 0.16); }

.btn-sm { padding: 10px 20px; font-size: var(--fs-xs); }

/* ---------- 6 头部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 250, 247, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--line); box-shadow: var(--sh-sm); }

.nav { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 72px; }

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: var(--fs-lg); color: var(--ink); }
.brand-mark {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 13px;
  background: var(--grad-main);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 800;
  box-shadow: var(--sh-rose);
}
.brand small { display: block; font-size: 0.62rem; font-weight: 600; color: var(--muted); letter-spacing: 0.18em; text-transform: uppercase; line-height: 1; margin-top: 3px; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 10px 16px;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--text);
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: var(--rose); background: #fff0f3; }
.nav-links a.is-active { color: var(--rose); background: #fff0f3; }

.nav-cta { display: inline-flex; }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: 12px;
  border: 1.5px solid var(--line);
  background: #fff;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 20px; height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-scrim {
  position: fixed; inset: 0;
  background: rgba(23, 20, 31, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
  z-index: 70;
}
.nav-scrim.is-open { opacity: 1; pointer-events: auto; }

/* ---------- 7 卡片 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 28px;
  box-shadow: var(--sh-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--sh-md); border-color: #ffd6dd; }

.card-icon {
  width: 54px; height: 54px;
  display: grid; place-items: center;
  border-radius: 16px;
  font-size: 1.5rem;
  margin-bottom: 18px;
  background: #fff0f3;
}
.card-icon--cool { background: #f1edff; }
.card-icon--mint { background: #e3fbf2; }

.card h3 { font-size: var(--fs-lg); margin-bottom: 8px; }
.card p { color: var(--muted); font-size: var(--fs-sm); }

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-weight: 700;
  font-size: var(--fs-sm);
  color: var(--rose);
}
.card-link:hover { gap: 10px; }
.card-link { transition: gap 0.25s var(--ease); }

/* ---------- 8 Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(52rem 30rem at 88% -8%, rgba(255, 122, 89, 0.16), transparent 60%),
    radial-gradient(40rem 26rem at -6% 22%, rgba(255, 77, 109, 0.14), transparent 55%),
    radial-gradient(34rem 24rem at 55% 115%, rgba(108, 75, 255, 0.12), transparent 60%),
    var(--paper);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
  padding-block: clamp(56px, 9vw, 110px);
}
.hero h1 { font-size: var(--fs-hero); margin-bottom: 20px; }
.hero p.lead { font-size: var(--fs-lg); color: var(--muted); max-width: 34em; margin-bottom: 30px; }

.hero-stats { display: flex; gap: clamp(20px, 4vw, 44px); flex-wrap: wrap; margin-top: 38px; }
.hero-stat b { display: block; font-size: var(--fs-xl); color: var(--ink); }
.hero-stat span { font-size: var(--fs-xs); color: var(--muted); }

.hero-visual { position: relative; }
.hero-visual .hero-img {
  border-radius: var(--r-xl);
  box-shadow: var(--sh-lg);
  width: 100%;
}
.hero-float {
  position: absolute;
  background: #fff;
  border-radius: var(--r-md);
  box-shadow: var(--sh-md);
  padding: 12px 18px;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-float .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 4px rgba(45, 212, 167, 0.25); }
.hero-float--1 { top: -18px; left: -14px; }
.hero-float--2 { bottom: 26px; right: -10px; }

/* ---------- 9 跑马灯 ---------- */
.marquee {
  overflow: hidden;
  background: var(--ink);
  padding-block: 14px;
  border-block: 1px solid rgba(255, 255, 255, 0.08);
}
.marquee-track {
  display: flex;
  gap: 48px;
  width: max-content;
  animation: marquee 30s linear infinite;
}
.marquee-track span {
  color: rgba(255, 255, 255, 0.82);
  font-size: var(--fs-sm);
  font-weight: 600;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.marquee-track span::before { content: "🍉"; font-size: 0.9em; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.marquee:hover .marquee-track { animation-play-state: paused; }

/* ---------- 10 视频卡 ---------- */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.video-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--sh-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-5px); box-shadow: var(--sh-md); }

.thumb { position: relative; aspect-ratio: 16 / 10; overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.video-card:hover .thumb img { transform: scale(1.06); }

.badge {
  position: absolute;
  top: 12px; left: 12px;
  z-index: 2;
  background: rgba(23, 20, 31, 0.78);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  backdrop-filter: blur(6px);
}
.badge--hot { background: var(--grad-main); }
.badge--live { background: var(--violet); }
.badge--live::before {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #fff;
  margin-right: 6px;
  animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.duration {
  position: absolute;
  right: 12px; bottom: 12px;
  z-index: 2;
  background: rgba(23, 20, 31, 0.78);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 9px;
  border-radius: 8px;
}

.play-btn {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 58px; height: 58px;
  z-index: 3;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--sh-md);
  display: grid;
  place-items: center;
  color: var(--rose);
  font-size: 1.15rem;
  padding-left: 4px;
  transition: transform 0.3s var(--ease), background 0.3s;
}
.video-card:hover .play-btn { transform: scale(1.1); background: var(--rose); color: #fff; }

.video-meta { padding: 18px 20px 22px; }
.video-meta h3 { font-size: var(--fs-base); margin-bottom: 8px; line-height: 1.4; }
.video-meta p { font-size: var(--fs-xs); color: var(--muted); display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 11 榜单 ---------- */
.ranking { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 26px; box-shadow: var(--sh-sm); }
.ranking h3 { font-size: var(--fs-lg); margin-bottom: 6px; }
.ranking > p { font-size: var(--fs-xs); color: var(--muted); margin-bottom: 18px; }
.ranking ol { counter-reset: rank; }
.ranking li {
  counter-increment: rank;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 6px;
  border-bottom: 1px dashed var(--line);
  transition: background 0.2s;
}
.ranking li:last-child { border-bottom: 0; }
.ranking li:hover { background: #fff7f8; }
.ranking li::before {
  content: counter(rank, decimal-leading-zero);
  font-weight: 800;
  font-size: 0.95rem;
  color: #c9bfce;
  min-width: 30px;
}
.ranking li:nth-child(-n + 3)::before { color: var(--rose); }
.ranking .rank-body { flex: 1; min-width: 0; }
.ranking .rank-body b { display: block; font-size: var(--fs-sm); color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ranking .rank-body span { font-size: var(--fs-xs); color: var(--muted); }
.trend { font-size: var(--fs-xs); font-weight: 800; }
.trend-up { color: #e63b5c; }
.trend-flat { color: var(--muted); }

/* ---------- 12 话题/文章列表 ---------- */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 30px; }
.filter-btn {
  padding: 9px 20px;
  border-radius: var(--r-pill);
  border: 1.5px solid var(--line);
  background: #fff;
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--text);
  transition: all 0.25s var(--ease);
}
.filter-btn:hover { border-color: var(--rose); color: var(--rose); }
.filter-btn.is-active { background: var(--ink); border-color: var(--ink); color: #fff; }

.topic-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.topic-card {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 16px;
  box-shadow: var(--sh-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.topic-card:hover { transform: translateY(-4px); box-shadow: var(--sh-md); }
.topic-card .topic-thumb { border-radius: var(--r-md); overflow: hidden; aspect-ratio: 1; }
.topic-card .topic-thumb img { width: 100%; height: 100%; object-fit: cover; }
.topic-card .topic-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--violet);
  background: #f1edff;
  border-radius: var(--r-pill);
  padding: 3px 11px;
  margin-bottom: 8px;
}
.topic-card .topic-tag--rose { color: var(--rose); background: #fff0f3; }
.topic-card .topic-tag--mint { color: #14a385; background: #e3fbf2; }
.topic-card h3 { font-size: var(--fs-base); margin-bottom: 6px; line-height: 1.45; }
.topic-card p { font-size: var(--fs-xs); color: var(--muted); margin-bottom: 10px; }
.topic-card .topic-meta { font-size: 0.72rem; color: var(--muted); display: flex; gap: 14px; flex-wrap: wrap; }

.article-list article {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 22px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.article-list article:first-child { padding-top: 0; }
.article-list .a-thumb { border-radius: var(--r-md); overflow: hidden; aspect-ratio: 16/10; }
.article-list .a-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.article-list article:hover .a-thumb img { transform: scale(1.05); }
.article-list h3 { font-size: var(--fs-lg); margin-bottom: 8px; transition: color 0.2s; }
.article-list article:hover h3 { color: var(--rose); }
.article-list p { font-size: var(--fs-sm); color: var(--muted); margin-bottom: 12px; }
.article-list .a-meta { font-size: var(--fs-xs); color: var(--muted); display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- 13 数据/特性 ---------- */
.stats-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.stat {
  text-align: center;
  padding: 34px 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-lg);
}
.stat b {
  display: block;
  font-size: var(--fs-2xl);
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.stat span { font-size: var(--fs-sm); color: rgba(255, 255, 255, 0.72); }

.feature-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.feature {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px;
  box-shadow: var(--sh-sm);
}
.feature .f-icon {
  flex: 0 0 52px;
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 15px;
  background: var(--grad-soft);
  font-size: 1.4rem;
}
.feature h3 { font-size: var(--fs-base); margin-bottom: 6px; }
.feature p { font-size: var(--fs-sm); color: var(--muted); }

/* ---------- 14 评价 ---------- */
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.quote {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 28px;
  box-shadow: var(--sh-sm);
  position: relative;
}
.quote::before {
  content: "\201C";
  position: absolute;
  top: 8px; right: 22px;
  font-size: 4.4rem;
  line-height: 1;
  color: var(--melon);
  font-family: Georgia, serif;
}
.quote p { font-size: var(--fs-sm); color: var(--text); margin-bottom: 20px; }
.quote .q-user { display: flex; align-items: center; gap: 12px; }
.quote .q-user .avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  font-size: 0.9rem;
  background: var(--grad-cool);
}
.quote .q-user b { display: block; font-size: var(--fs-sm); color: var(--ink); }
.quote .q-user span { font-size: var(--fs-xs); color: var(--muted); }
.quote .stars { color: #ffb020; font-size: 0.85rem; letter-spacing: 2px; margin-bottom: 10px; }

/* ---------- 15 CTA/下载 ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(40rem 22rem at 12% 0%, rgba(255, 122, 89, 0.35), transparent 55%),
    radial-gradient(36rem 22rem at 90% 110%, rgba(108, 75, 255, 0.4), transparent 55%),
    var(--ink);
  border-radius: var(--r-xl);
  padding: clamp(40px, 6vw, 72px);
  text-align: center;
  color: rgba(255, 255, 255, 0.82);
}
.cta-band h2, .cta-band h3 { color: #fff; }
.cta-band h2 { font-size: var(--fs-2xl); margin-bottom: 14px; }
.cta-band p { max-width: 36em; margin-inline: auto; margin-bottom: 30px; }
.cta-band .btn-group { justify-content: center; }

.dl-card {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
  background: var(--grad-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: clamp(28px, 4vw, 52px);
}
.dl-phone {
  position: relative;
  max-width: 300px;
  margin-inline: auto;
  border-radius: 34px;
  box-shadow: var(--sh-lg);
  overflow: hidden;
  border: 6px solid var(--ink);
}
.dl-steps { display: grid; gap: 18px; }
.dl-step { display: flex; gap: 16px; align-items: flex-start; }
.dl-step .n {
  flex: 0 0 40px;
  width: 40px; height: 40px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  background: var(--grad-main);
  box-shadow: var(--sh-rose);
}
.dl-step b { display: block; color: var(--ink); font-size: var(--fs-base); }
.dl-step p { font-size: var(--fs-sm); color: var(--muted); }

/* ---------- 16 FAQ ---------- */
.faq { max-width: 780px; margin-inline: auto; display: grid; gap: 14px; }
.faq-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.faq-item.is-open { border-color: #ffd6dd; box-shadow: var(--sh-sm); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  padding: 20px 24px;
  font-weight: 700;
  font-size: var(--fs-base);
  color: var(--ink);
}
.faq-q .chev {
  flex: 0 0 auto;
  width: 30px; height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #fff0f3;
  color: var(--rose);
  font-size: 0.85rem;
  transition: transform 0.3s var(--ease);
}
.faq-item.is-open .chev { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s var(--ease); }
.faq-a p { padding: 0 24px 22px; font-size: var(--fs-sm); color: var(--muted); }

/* ---------- 17 提示条/弹层 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translate(-50%, 20px);
  background: var(--ink);
  color: #fff;
  font-size: var(--fs-sm);
  font-weight: 600;
  padding: 13px 26px;
  border-radius: var(--r-pill);
  box-shadow: var(--sh-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  z-index: 100;
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

.video-modal {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(15, 12, 22, 0.72);
  backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}
.video-modal.is-open { opacity: 1; pointer-events: auto; }
.video-modal-box {
  position: relative;
  width: min(880px, 100%);
  background: var(--ink-2);
  border-radius: var(--r-lg);
  padding: 18px;
  transform: translateY(16px) scale(0.97);
  transition: transform 0.3s var(--ease);
}
.video-modal.is-open .video-modal-box { transform: none; }
.video-modal-screen {
  aspect-ratio: 16 / 9;
  border-radius: var(--r-md);
  overflow: hidden;
  display: grid;
  place-items: center;
  background:
    radial-gradient(30rem 18rem at 30% 0%, rgba(255, 77, 109, 0.4), transparent 60%),
    radial-gradient(26rem 16rem at 80% 110%, rgba(108, 75, 255, 0.4), transparent 60%),
    var(--ink);
  text-align: center;
  color: rgba(255, 255, 255, 0.8);
  padding: 24px;
}
.video-modal-screen .vm-icon { font-size: 3rem; margin-bottom: 12px; }
.video-modal-screen b { display: block; color: #fff; font-size: var(--fs-lg); margin-bottom: 6px; }
.video-modal-close {
  position: absolute;
  top: -16px; right: -16px;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: #fff;
  color: var(--ink);
  font-size: 1.1rem;
  display: grid;
  place-items: center;
  box-shadow: var(--sh-md);
}

.back-top {
  position: fixed;
  right: 22px; bottom: 22px;
  z-index: 80;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: var(--sh-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all 0.3s var(--ease);
}
.back-top.is-show { opacity: 1; pointer-events: auto; transform: none; }
.back-top:hover { background: var(--rose); }

/* ---------- 18 页脚 ---------- */
.site-footer { background: var(--ink); color: rgba(255, 255, 255, 0.72); padding-block: 64px 30px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; margin-bottom: 44px; }
.site-footer h3 { color: #fff; font-size: var(--fs-base); margin-bottom: 16px; }
.site-footer .brand { color: #fff; }
.site-footer .brand small { color: rgba(255, 255, 255, 0.5); }
.site-footer p { font-size: var(--fs-sm); }
.site-footer ul li { margin-bottom: 10px; }
.site-footer ul a { font-size: var(--fs-sm); transition: color 0.2s; }
.site-footer ul a:hover { color: #ff8fa3; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud a {
  font-size: 0.72rem;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: background 0.2s;
}
.tag-cloud a:hover { background: rgba(255, 77, 109, 0.3); color: #fff; }
.footer-disclaimer {
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.45);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  line-height: 1.8;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.45);
}

/* ---------- 19 内页页头 ---------- */
.page-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(46rem 26rem at 85% -10%, rgba(255, 77, 109, 0.14), transparent 60%),
    radial-gradient(38rem 22rem at 0% 110%, rgba(108, 75, 255, 0.12), transparent 55%),
    var(--grad-soft);
  padding-block: clamp(48px, 7vw, 84px);
}
.page-hero h1 { font-size: var(--fs-hero); margin-bottom: 16px; }
.page-hero .lead { font-size: var(--fs-lg); color: var(--muted); max-width: 40em; }
.breadcrumb { display: flex; gap: 8px; flex-wrap: wrap; font-size: var(--fs-xs); color: var(--muted); margin-bottom: 18px; }
.breadcrumb a:hover { color: var(--rose); }
.breadcrumb span[aria-current] { color: var(--rose); font-weight: 700; }

/* ---------- 20 分页 ---------- */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 44px; }
.pagination a {
  min-width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 13px;
  border: 1.5px solid var(--line);
  background: #fff;
  font-weight: 700;
  font-size: var(--fs-sm);
  transition: all 0.25s;
}
.pagination a:hover { border-color: var(--rose); color: var(--rose); }
.pagination a.is-current { background: var(--ink); border-color: var(--ink); color: #fff; }

/* ---------- 21 滚动动画 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 22 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 960px) {
  .nav-links {
    position: fixed;
    top: 0; right: 0;
    height: 100dvh;
    width: min(320px, 84vw);
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 96px 24px 32px;
    box-shadow: var(--sh-lg);
    transform: translateX(105%);
    transition: transform 0.35s var(--ease);
    z-index: 75;
    overflow-y: auto;
  }
  .nav-links.is-open { transform: none; }
  .nav-links a { padding: 14px 18px; font-size: var(--fs-base); }
  .nav-toggle { display: flex; }
  .nav-toggle { position: relative; z-index: 80; }
  .nav-cta { display: none; }

  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { max-width: 560px; margin-inline: auto; width: 100%; }
  .hero-float--1 { left: 6px; }
  .hero-float--2 { right: 6px; }

  .grid-side { grid-template-columns: 1fr; }
  .quote-grid { grid-template-columns: 1fr 1fr; }
  .stats-band { grid-template-columns: 1fr 1fr; }
  .dl-card { grid-template-columns: 1fr; }
  .topic-list { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .grid-2, .grid-3, .grid-4,
  .feature-row, .video-grid, .quote-grid { grid-template-columns: 1fr; }
  .article-list article { grid-template-columns: 1fr; }
  .article-list .a-thumb { aspect-ratio: 16/9; }
  .topic-card { grid-template-columns: 96px 1fr; }
  .btn-group .btn { flex: 1 1 100%; }
  .hero-stats { gap: 18px 28px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .video-modal { padding: 14px; }
  .video-modal-close { top: -14px; right: 0; }
  .stats-band { grid-template-columns: 1fr 1fr; gap: 14px; }
}

@media (max-width: 420px) {
  .topic-card { grid-template-columns: 1fr; }
  .topic-card .topic-thumb { aspect-ratio: 16/9; }
  .hero-float { transform: scale(0.88); transform-origin: left top; }
  .hero-float--2 { transform-origin: right bottom; }
  .stat b { font-size: var(--fs-xl); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- 23 附加组件（内页专用） ---------- */
.timeline { position: relative; padding-left: 30px; display: grid; gap: 26px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 9px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--rose), var(--violet));
  border-radius: 2px;
}
.tl-item { position: relative; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--rose);
}
.tl-item time { font-size: var(--fs-xs); font-weight: 800; color: var(--rose); letter-spacing: 0.06em; }
.tl-item h3 { font-size: var(--fs-base); margin: 4px 0 6px; }
.tl-item p { font-size: var(--fs-sm); color: var(--muted); }

.matrix { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.matrix .m-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px;
  text-align: center;
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.matrix .m-item:hover { transform: translateY(-4px); box-shadow: var(--sh-md); }
.matrix .m-item .mi-icon { font-size: 1.9rem; margin-bottom: 10px; }
.matrix .m-item b { display: block; color: var(--ink); font-size: var(--fs-sm); margin-bottom: 4px; }
.matrix .m-item span { font-size: var(--fs-xs); color: var(--muted); }

.callout {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: #fff7f0;
  border: 1px solid #ffe3c7;
  border-radius: var(--r-md);
  padding: 20px 24px;
  font-size: var(--fs-sm);
  color: #7a5b3a;
}
.callout .c-icon { font-size: 1.3rem; flex: 0 0 auto; }

.prose { max-width: 760px; }
.prose h2 { font-size: var(--fs-xl); margin: 38px 0 14px; }
.prose h3 { font-size: var(--fs-lg); margin: 28px 0 10px; }
.prose p { margin-bottom: 14px; color: var(--text); }
.prose ul { list-style: disc; padding-left: 22px; margin-bottom: 16px; }
.prose ul li { margin-bottom: 8px; }
.prose strong { color: var(--ink); }

@media (max-width: 960px) {
  .matrix { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .matrix { grid-template-columns: 1fr; }
}