/* ==========================================================================
   酸菜社 suancaishe — 设计系统 style.css
   分区: 1 变量 2 重置 3 布局工具 4 文字标题 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
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  /* 品牌色:酸菜绿三档 */
  --brand-700:#128a43;
  --brand-600:#16a34a;
  --brand-500:#2ec46a;
  --brand-100:#e0f7e9;
  --brand-050:#f1fbf5;
  /* 点缀色 */
  --coral:#ff6b81;
  --coral-soft:#ffe9ed;
  --sun:#ffce3a;
  --sun-soft:#fff6d9;
  --grape:#7c5cff;
  --grape-soft:#efebff;
  --sky:#29a8ff;
  --sky-soft:#e4f4ff;
  /* 中性色 */
  --ink:#152019;
  --ink-2:#3d4b44;
  --ink-3:#6b7a72;
  --line:#e4ece7;
  --line-2:#d3ded7;
  --paper:#fbfdfb;
  --card:#ffffff;
  --muted-bg:#f4f8f5;
  /* 渐变 */
  --grad-brand:linear-gradient(135deg,#2ec46a 0%,#16a34a 55%,#0f7a3d 100%);
  --grad-cute:linear-gradient(135deg,#ff6b81 0%,#ffce3a 100%);
  --grad-deep:linear-gradient(150deg,#0d2b1b 0%,#123c26 60%,#1d5c38 100%);
  /* 圆角 */
  --r-xs:8px; --r-sm:12px; --r-md:18px; --r-lg:24px; --r-xl:32px; --r-full:999px;
  /* 阴影 */
  --sh-1:0 1px 2px rgba(21,32,25,.05),0 2px 8px rgba(21,32,25,.05);
  --sh-2:0 4px 14px rgba(21,32,25,.08);
  --sh-3:0 12px 32px rgba(21,32,25,.12);
  --sh-brand:0 10px 28px rgba(22,163,74,.28);
  --sh-coral:0 10px 28px rgba(255,107,129,.28);
  /* 字号 */
  --fs-xs:clamp(.74rem,.72rem + .1vw,.82rem);
  --fs-sm:clamp(.84rem,.82rem + .15vw,.92rem);
  --fs-md:clamp(.95rem,.92rem + .2vw,1.04rem);
  --fs-lg:clamp(1.08rem,1rem + .5vw,1.28rem);
  --fs-xl:clamp(1.3rem,1.1rem + 1vw,1.7rem);
  --fs-2xl:clamp(1.6rem,1.25rem + 1.7vw,2.3rem);
  --fs-hero:clamp(2.1rem,1.5rem + 3vw,3.4rem);
  /* 布局 */
  --container:1180px;
  --gutter:clamp(16px,4vw,28px);
  --ease:cubic-bezier(.22,.8,.32,1);
  --font:"Outfit","Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}

/* ---------- 2. 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--paper);
  font-size:var(--fs-md);line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,textarea,select{font-family:inherit;font-size:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5{margin:0;line-height:1.25;color:var(--ink);font-weight:700}
p{margin:0}
:focus-visible{outline:3px solid rgba(46,196,106,.5);outline-offset:2px;border-radius:4px}
::selection{background:var(--brand-100);color:var(--brand-700)}

/* ---------- 3. 布局工具 ---------- */
.container{max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(56px,8vw,96px)}
.section--tight{padding-block:clamp(40px,5vw,64px)}
.section--alt{background:var(--muted-bg)}
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-side{grid-template-columns:1.25fr .75fr;align-items:start}
.row-between{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.center{text-align:center}
.muted{color:var(--ink-3)}
.small{font-size:var(--fs-sm)}
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:var(--r-full);
  font-size:var(--fs-xs);font-weight:600;background:var(--brand-100);color:var(--brand-700)}
.tag--coral{background:var(--coral-soft);color:#d43c53}
.tag--sun{background:var(--sun-soft);color:#a07206}
.tag--grape{background:var(--grape-soft);color:#5b3fd6}
.tag--sky{background:var(--sky-soft);color:#0b7ac2}
.tag--ghost{background:#fff;border:1px solid var(--line-2);color:var(--ink-2)}
.divider{height:1px;background:var(--line);border:none;margin:0}

/* ---------- 4. 文字标题组件 ---------- */
.kicker{display:inline-flex;align-items:center;gap:8px;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;font-size:var(--fs-xs);color:var(--brand-600);margin-bottom:12px}
.kicker::before{content:"";width:22px;height:3px;border-radius:2px;background:var(--grad-cute)}
.h2{font-size:var(--fs-2xl);letter-spacing:-.01em}
.section-head{max-width:640px;margin-bottom:clamp(28px,4vw,44px)}
.section-head p{margin-top:10px;color:var(--ink-3)}
.section-head--center{margin-inline:auto;text-align:center}
.section-head--center .kicker::before{display:none}
.highlight{position:relative;z-index:0;display:inline-block}
.highlight::after{content:"";position:absolute;left:-2px;right:-2px;bottom:.08em;height:.42em;
  background:var(--sun);opacity:.45;z-index:-1;border-radius:4px}

/* ---------- 5. 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:var(--r-full);font-weight:700;font-size:var(--fs-md);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
  will-change:transform;line-height:1.2}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--grad-brand);color:#fff;box-shadow:var(--sh-brand)}
.btn--primary:hover{box-shadow:0 14px 34px rgba(22,163,74,.4)}
.btn--cute{background:var(--grad-cute);color:#5c1020;box-shadow:var(--sh-coral)}
.btn--ghost{background:#fff;color:var(--ink);border:1.5px solid var(--line-2);box-shadow:var(--sh-1)}
.btn--ghost:hover{border-color:var(--brand-500);color:var(--brand-700)}
.btn--light{background:#fff;color:var(--brand-700);box-shadow:var(--sh-2)}
.btn--sm{padding:9px 18px;font-size:var(--fs-sm)}
.btn-group{display:flex;gap:14px;flex-wrap:wrap}
.btn-group .btn{flex:0 1 auto}

/* ---------- 6. 头部导航 ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(251,253,251,.85);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;transition:border-color .3s,box-shadow .3s}
.site-header.is-scrolled{border-bottom-color:var(--line);box-shadow:var(--sh-1)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;height:72px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:1.18rem;letter-spacing:-.01em}
.brand__mark{width:40px;height:40px;border-radius:14px;background:var(--grad-brand);
  display:grid;place-items:center;font-size:1.25rem;box-shadow:var(--sh-brand);
  transition:transform .35s var(--ease)}
.brand:hover .brand__mark{transform:rotate(-8deg) scale(1.06)}
.brand__name em{font-style:normal;color:var(--brand-600)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{padding:9px 15px;border-radius:var(--r-full);font-weight:600;font-size:var(--fs-sm);
  color:var(--ink-2);transition:background .2s,color .2s}
.nav-links a:hover{background:var(--brand-100);color:var(--brand-700)}
.nav-links a.is-active{background:var(--brand-600);color:#fff}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-toggle{display:none;width:44px;height:44px;border-radius:12px;position:relative;z-index:80}
.nav-toggle span{position:absolute;left:11px;right:11px;height:2.4px;border-radius:2px;
  background:var(--ink);transition:transform .3s var(--ease),opacity .2s}
.nav-toggle span:nth-child(1){top:15px}
.nav-toggle span:nth-child(2){top:21px}
.nav-toggle span:nth-child(3){top:27px}
.nav-toggle.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-scrim{position:fixed;inset:0;background:rgba(13,26,19,.45);opacity:0;pointer-events:none;
  transition:opacity .3s;z-index:70}
.nav-scrim.is-visible{opacity:1;pointer-events:auto}

/* ---------- 7. 卡片 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:26px;box-shadow:var(--sh-1);transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--sh-3)}
.card__icon{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
  font-size:1.5rem;margin-bottom:16px}
.card h3{font-size:var(--fs-lg);margin-bottom:8px}
.card p{color:var(--ink-3);font-size:var(--fs-sm)}
.card__link{display:inline-flex;align-items:center;gap:6px;margin-top:14px;font-weight:700;
  font-size:var(--fs-sm);color:var(--brand-600)}
.card__link::after{content:"→";transition:transform .25s var(--ease)}
.card__link:hover::after{transform:translateX(4px)}
.card--flush{padding:0;overflow:hidden}
.card--flush .card__body{padding:22px 24px 26px}

/* ---------- 8. Hero ---------- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(900px 480px at 88% -10%,rgba(255,206,58,.22),transparent 60%),
  radial-gradient(700px 420px at -6% 20%,rgba(46,196,106,.16),transparent 55%),
  radial-gradient(600px 400px at 55% 110%,rgba(255,107,129,.12),transparent 60%),
  var(--paper)}
.hero__inner{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,5vw,56px);
  align-items:center;padding-block:clamp(48px,7vw,88px)}
.hero h1{font-size:var(--fs-hero);letter-spacing:-.02em;line-height:1.15;margin:14px 0 18px}
.hero__lead{color:var(--ink-3);font-size:var(--fs-lg);max-width:34em}
.hero__stats{display:flex;gap:clamp(18px,3vw,40px);margin-top:30px;flex-wrap:wrap}
.hero__stat b{display:block;font-size:var(--fs-xl);color:var(--brand-700);letter-spacing:-.02em}
.hero__stat span{font-size:var(--fs-xs);color:var(--ink-3)}
.hero__visual{position:relative}
.hero__photo{border-radius:var(--r-xl);box-shadow:var(--sh-3);width:100%;object-fit:cover}
.hero__float{position:absolute;background:#fff;border-radius:var(--r-md);box-shadow:var(--sh-3);
  padding:12px 16px;display:flex;align-items:center;gap:10px;font-size:var(--fs-sm);font-weight:700;
  animation:floaty 5s ease-in-out infinite}
.hero__float small{display:block;font-weight:600;color:var(--ink-3);font-size:var(--fs-xs)}
.hero__float--1{top:7%;left:-6%;animation-delay:.2s}
.hero__float--2{bottom:10%;right:-5%;animation-delay:1.2s}
.hero__float i{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
  font-style:normal;font-size:1.15rem}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.hero__blob{position:absolute;z-index:-1;border-radius:50%;filter:blur(2px)}
.hero__blob--1{width:120px;height:120px;background:var(--sun-soft);top:-30px;right:8%}
.hero__blob--2{width:90px;height:90px;background:var(--coral-soft);bottom:6%;left:-24px}

/* ---------- 9. 跑马灯 ---------- */
.ticker{background:var(--grad-deep);color:#d9efe2;overflow:hidden;padding-block:14px}
.ticker__track{display:flex;gap:48px;width:max-content;animation:ticker 26s linear infinite}
.ticker__track span{display:inline-flex;align-items:center;gap:10px;font-size:var(--fs-sm);white-space:nowrap}
.ticker__track span::before{content:"🥬";font-size:.9rem}
@keyframes ticker{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ---------- 10. 视频卡 ---------- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.video-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;
  box-shadow:var(--sh-1);transition:transform .3s var(--ease),box-shadow .3s var(--ease);cursor:pointer}
.video-card:hover{transform:translateY(-5px);box-shadow:var(--sh-3)}
.thumb{position:relative;overflow:hidden;aspect-ratio:16/10;background:var(--muted-bg)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.video-card:hover .thumb img{transform:scale(1.05)}
.thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(10,20,14,.55));opacity:.9}
.thumb .chip{position:absolute;z-index:2;top:12px;left:12px}
.thumb .dur{position:absolute;z-index:2;bottom:10px;right:12px;color:#fff;font-size:var(--fs-xs);
  font-weight:700;background:rgba(10,20,14,.6);padding:3px 9px;border-radius:var(--r-full)}
.thumb .play{position:absolute;z-index:2;inset:0;margin:auto;width:54px;height:54px;border-radius:50%;
  background:rgba(255,255,255,.92);display:grid;place-items:center;color:var(--brand-700);
  font-size:1.2rem;box-shadow:var(--sh-2);transition:transform .3s var(--ease)}
.video-card:hover .play{transform:scale(1.12)}
.video-card__body{padding:18px 20px 20px}
.video-card__body h3{font-size:1.02rem;margin-bottom:8px}
.video-card__meta{display:flex;gap:14px;color:var(--ink-3);font-size:var(--fs-xs);flex-wrap:wrap}
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:28px}
.filter-btn{padding:9px 20px;border-radius:var(--r-full);border:1.5px solid var(--line-2);
  background:#fff;font-weight:600;font-size:var(--fs-sm);color:var(--ink-2);
  transition:all .25s var(--ease)}
.filter-btn:hover{border-color:var(--brand-500);color:var(--brand-700)}
.filter-btn.is-active{background:var(--ink);border-color:var(--ink);color:#fff}
.video-card.is-hidden{display:none}

/* ---------- 11. 榜单 ---------- */
.rank-list{display:flex;flex-direction:column}
.rank-item{display:flex;align-items:center;gap:14px;padding:14px 4px;border-bottom:1px dashed var(--line-2)}
.rank-item:last-child{border-bottom:none}
.rank-item__no{width:30px;height:30px;border-radius:10px;display:grid;place-items:center;
  font-weight:800;font-size:var(--fs-sm);background:var(--muted-bg);color:var(--ink-3);flex:none}
.rank-item:nth-child(1) .rank-item__no{background:var(--grad-cute);color:#fff}
.rank-item:nth-child(2) .rank-item__no{background:var(--brand-500);color:#fff}
.rank-item:nth-child(3) .rank-item__no{background:var(--sun);color:#5c4500}
.rank-item__body{flex:1;min-width:0}
.rank-item__body h4{font-size:var(--fs-sm);font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rank-item__body span{font-size:var(--fs-xs);color:var(--ink-3)}
.rank-item__heat{font-weight:800;font-size:var(--fs-xs);color:var(--coral);flex:none}

/* ---------- 12. 话题/文章列表 ---------- */
.topic-list{display:flex;flex-direction:column;gap:18px}
.topic-item{display:grid;grid-template-columns:220px 1fr;gap:22px;background:#fff;
  border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-1);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.topic-item:hover{transform:translateY(-4px);box-shadow:var(--sh-3)}
.topic-item__img{width:100%;height:100%;min-height:150px;object-fit:cover}
.topic-item__body{padding:20px 24px 20px 0}
.topic-item__body h3{font-size:var(--fs-lg);margin:8px 0 8px}
.topic-item__body p{color:var(--ink-3);font-size:var(--fs-sm)}
.topic-item__meta{display:flex;gap:16px;margin-top:12px;font-size:var(--fs-xs);color:var(--ink-3);flex-wrap:wrap}
.article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.article-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-1);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.article-card:hover{transform:translateY(-4px);box-shadow:var(--sh-3)}
.article-card img{aspect-ratio:16/9;width:100%;object-fit:cover}
.article-card__body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1}
.article-card__body h3{font-size:1.05rem}
.article-card__body p{color:var(--ink-3);font-size:var(--fs-sm);flex:1}
.article-card__foot{display:flex;justify-content:space-between;font-size:var(--fs-xs);color:var(--ink-3)}

/* ---------- 13. 数据/特性 ---------- */
.stat-band{background:var(--grad-deep);color:#fff;border-radius:var(--r-xl);
  padding:clamp(32px,5vw,56px);display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-band b{display:block;font-size:clamp(1.6rem,1.2rem + 2vw,2.4rem);letter-spacing:-.02em;color:#8ef0b2}
.stat-band span{font-size:var(--fs-sm);color:#bcd9c7}
.feature-row{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature{display:flex;gap:16px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  padding:22px;box-shadow:var(--sh-1)}
.feature i{font-style:normal;font-size:1.5rem;width:50px;height:50px;flex:none;border-radius:15px;
  display:grid;place-items:center}
.feature h3{font-size:1rem;margin-bottom:5px}
.feature p{font-size:var(--fs-sm);color:var(--ink-3)}

/* ---------- 14. 评价 ---------- */
.quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.quote{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:26px;
  box-shadow:var(--sh-1);position:relative}
.quote::before{content:"“";position:absolute;top:8px;right:20px;font-size:4rem;line-height:1;
  color:var(--brand-100);font-family:Georgia,serif}
.quote p{font-size:var(--fs-sm);color:var(--ink-2);position:relative}
.quote__who{display:flex;align-items:center;gap:12px;margin-top:18px}
.quote__who img{width:44px;height:44px;border-radius:50%;object-fit:cover}
.quote__who b{display:block;font-size:var(--fs-sm)}
.quote__who span{font-size:var(--fs-xs);color:var(--ink-3)}
.quote__stars{color:var(--sun);font-size:.85rem;letter-spacing:2px;margin-bottom:10px}

/* ---------- 15. CTA/下载 ---------- */
.cta-band{position:relative;overflow:hidden;background:var(--grad-deep);color:#fff;
  border-radius:var(--r-xl);padding:clamp(36px,6vw,72px);text-align:center}
.cta-band::before{content:"";position:absolute;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(46,196,106,.35),transparent 70%);top:-140px;right:-80px}
.cta-band::after{content:"";position:absolute;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,107,129,.3),transparent 70%);bottom:-120px;left:-60px}
.cta-band h2,.cta-band h3{color:#fff}
.cta-band p{color:#c4dccd;max-width:36em;margin:12px auto 0}
.cta-band .btn-group{justify-content:center;margin-top:26px}
.store-btn{display:inline-flex;align-items:center;gap:12px;background:#fff;color:var(--ink);
  border-radius:16px;padding:12px 22px;box-shadow:var(--sh-2);transition:transform .25s var(--ease)}
.store-btn:hover{transform:translateY(-3px)}
.store-btn i{font-style:normal;font-size:1.6rem}
.store-btn small{display:block;font-size:var(--fs-xs);color:var(--ink-3);font-weight:600}
.store-btn b{font-size:1.02rem}
.download-hero{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,56px);align-items:center}
.download-hero h1{font-size:var(--fs-hero);letter-spacing:-.02em;margin:12px 0 16px}
.qr-card{display:inline-flex;gap:18px;align-items:center;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-lg);padding:18px 22px;box-shadow:var(--sh-1);margin-top:26px}
.qr-code{width:96px;height:96px;border-radius:14px;background:
  conic-gradient(var(--brand-600) 25%,#fff 0 50%,var(--brand-600) 0 75%,#fff 0);
  background-size:14px 14px;border:4px solid var(--brand-100)}

/* ---------- 16. FAQ ---------- */
.faq{max-width:760px;margin-inline:auto;display:flex;flex-direction:column;gap:14px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  overflow:hidden;transition:box-shadow .3s}
.faq-item.is-open{box-shadow:var(--sh-2);border-color:var(--brand-500)}
.faq-item__q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;font-weight:700;font-size:var(--fs-md);text-align:left;color:var(--ink)}
.faq-item__q::after{content:"+";font-size:1.5rem;font-weight:600;color:var(--brand-600);
  transition:transform .3s var(--ease);flex:none}
.faq-item.is-open .faq-item__q::after{transform:rotate(45deg)}
.faq-item__a{max-height:0;overflow:hidden;transition:max-height .35s var(--ease)}
.faq-item__a p{padding:0 22px 20px;color:var(--ink-3);font-size:var(--fs-sm)}

/* ---------- 17. 提示条/弹层 ---------- */
.toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,20px);background:var(--ink);
  color:#fff;padding:12px 22px;border-radius:var(--r-full);font-size:var(--fs-sm);font-weight:600;
  box-shadow:var(--sh-3);opacity:0;pointer-events:none;transition:all .35s var(--ease);z-index:100}
.toast.is-visible{opacity:1;transform:translate(-50%,0)}
.video-modal{position:fixed;inset:0;z-index:90;display:grid;place-items:center;padding:20px;
  opacity:0;pointer-events:none;transition:opacity .3s}
.video-modal.is-open{opacity:1;pointer-events:auto}
.video-modal__backdrop{position:absolute;inset:0;background:rgba(10,18,13,.7)}
.video-modal__box{position:relative;background:#fff;border-radius:var(--r-lg);max-width:640px;width:100%;
  padding:28px;box-shadow:var(--sh-3);transform:translateY(14px);transition:transform .3s var(--ease)}
.video-modal.is-open .video-modal__box{transform:translateY(0)}
.video-modal__close{position:absolute;top:14px;right:14px;width:38px;height:38px;border-radius:50%;
  background:var(--muted-bg);font-size:1.1rem;display:grid;place-items:center;color:var(--ink-2)}
.video-modal__poster{border-radius:var(--r-md);overflow:hidden;aspect-ratio:16/9;position:relative;margin-top:14px}
.video-modal__poster img{width:100%;height:100%;object-fit:cover}
.video-modal__poster::after{content:"▶ 示意封面 · 播放功能演示";position:absolute;inset:0;
  display:grid;place-items:center;background:rgba(10,18,13,.35);color:#fff;font-weight:700}

/* ---------- 18. 页脚 ---------- */
.site-footer{background:var(--grad-deep);color:#c9ddcf;margin-top:clamp(56px,8vw,96px)}
.site-footer a:hover{color:#fff}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:clamp(24px,4vw,48px);
  padding-block:clamp(40px,6vw,64px)}
.site-footer h4{color:#fff;font-size:var(--fs-sm);margin-bottom:14px;letter-spacing:.05em}
.site-footer li{margin-bottom:9px;font-size:var(--fs-sm)}
.site-footer .brand{color:#fff}
.footer-desc{font-size:var(--fs-sm);margin-top:12px;max-width:26em;color:#a9c7b4}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud a{font-size:var(--fs-xs);padding:5px 12px;border-radius:var(--r-full);
  border:1px solid rgba(255,255,255,.18);color:#c9ddcf;transition:all .25s}
.tag-cloud a:hover{border-color:var(--brand-500);color:#fff;background:rgba(46,196,106,.15)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-block:20px;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:var(--fs-xs);color:#8fb49c}

/* ---------- 19. 内页页头 ---------- */
.page-hero{position:relative;overflow:hidden;background:
  radial-gradient(700px 380px at 92% -20%,rgba(255,206,58,.2),transparent 60%),
  radial-gradient(560px 340px at 0% 0%,rgba(46,196,106,.14),transparent 55%),var(--muted-bg);
  padding-block:clamp(44px,6vw,72px)}
.breadcrumb{display:flex;gap:8px;align-items:center;font-size:var(--fs-xs);color:var(--ink-3);margin-bottom:14px}
.breadcrumb a:hover{color:var(--brand-600)}
.page-hero h1{font-size:var(--fs-2xl);letter-spacing:-.01em}
.page-hero .lead{margin-top:10px;color:var(--ink-3);max-width:42em}
.page-hero--split .container{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.page-hero__img{border-radius:var(--r-xl);box-shadow:var(--sh-3);width:100%;object-fit:cover;max-height:340px}

/* ---------- 20. 分页 ---------- */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:40px}
.pagination a,.pagination span{min-width:40px;height:40px;display:grid;place-items:center;
  border-radius:12px;font-weight:700;font-size:var(--fs-sm);border:1.5px solid var(--line-2);
  background:#fff;color:var(--ink-2);padding-inline:12px}
.pagination a:hover{border-color:var(--brand-500);color:var(--brand-700)}
.pagination .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 .7s var(--ease),transform .7s var(--ease)}
[data-reveal].is-revealed{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;
    transition-duration:.01ms!important}
  [data-reveal]{opacity:1;transform:none}
}

/* ---------- 22. 响应式 ---------- */
@media (max-width:1080px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .stat-band{grid-template-columns:repeat(2,1fr)}
  .quote-grid,.article-list{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:960px){
  .nav-toggle{display:block}
  .nav-links{position:fixed;top:0;right:0;bottom:0;width:min(320px,84vw);z-index:75;
    background:#fff;flex-direction:column;align-items:stretch;gap:6px;padding:96px 24px 32px;
    box-shadow:var(--sh-3);transform:translateX(105%);transition:transform .35s var(--ease)}
  .nav-links.is-open{transform:translateX(0)}
  .nav-links a{padding:14px 18px;font-size:var(--fs-md)}
  .nav-cta .btn{display:none}
  .hero__inner,.download-hero,.page-hero--split .container{grid-template-columns:1fr}
  .hero__visual{max-width:520px}
  .grid-side{grid-template-columns:1fr}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .grid-2,.grid-3,.grid-4,.quote-grid,.article-list,.feature-row,.video-grid{grid-template-columns:1fr}
  .stat-band{grid-template-columns:repeat(2,1fr)}
  .topic-item{grid-template-columns:1fr}
  .topic-item__body{padding:0 22px 22px}
  .topic-item__img{min-height:170px}
  .btn-group .btn{flex:1 1 100%}
  .hero__float--1{left:0}
  .hero__float--2{right:0}
  .footer-grid{grid-template-columns:1fr}
  .qr-card{flex-direction:row;width:100%;justify-content:center}
}
@media (max-width:420px){
  .stat-band{grid-template-columns:1fr;gap:18px}
  .hero__float{transform:scale(.88);transform-origin:left top}
  .hero__float--2{transform-origin:right bottom}
  .filter-bar{gap:8px}
}

/* ---------- 23. 附加组件 ---------- */
.comment-card{display:flex;gap:14px;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-md);padding:18px 20px;box-shadow:var(--sh-1)}
.comment-card img{width:42px;height:42px;border-radius:50%;object-fit:cover;flex:none}
.comment-card b{font-size:var(--fs-sm)}
.comment-card time{font-size:var(--fs-xs);color:var(--ink-3);margin-left:8px}
.comment-card p{font-size:var(--fs-sm);color:var(--ink-2);margin-top:6px}
.timeline{position:relative;padding-left:34px;display:flex;flex-direction:column;gap:26px}
.timeline::before{content:"";position:absolute;left:11px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(var(--brand-500),var(--sun))}
.timeline__item{position:relative}
.timeline__item::before{content:"";position:absolute;left:-30px;top:5px;width:16px;height:16px;
  border-radius:50%;background:#fff;border:4px solid var(--brand-500)}
.timeline__item:nth-child(even)::before{border-color:var(--sun)}
.timeline__item h3{font-size:var(--fs-lg)}
.timeline__item p{font-size:var(--fs-sm);color:var(--ink-3)}
.step-num{width:44px;height:44px;border-radius:14px;background:var(--grad-brand);color:#fff;
  display:grid;place-items:center;font-weight:800;font-size:1.1rem;margin-bottom:14px;
  box-shadow:var(--sh-brand)}
.matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.matrix__cell{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:20px;
  display:flex;gap:12px;align-items:flex-start;box-shadow:var(--sh-1)}
.matrix__cell i{font-style:normal;font-size:1.3rem;flex:none}
.matrix__cell b{font-size:var(--fs-sm);display:block}
.matrix__cell span{font-size:var(--fs-xs);color:var(--ink-3)}
.longform{max-width:760px;margin-inline:auto}
.longform h2{font-size:var(--fs-xl);margin:34px 0 12px;padding-top:22px;border-top:1px dashed var(--line-2)}
.longform h3{font-size:var(--fs-lg);margin:24px 0 10px}
.longform p{color:var(--ink-2);margin-bottom:14px}
.longform blockquote{margin:20px 0;padding:18px 24px;background:var(--brand-050);
  border-left:4px solid var(--brand-500);border-radius:var(--r-sm);color:var(--brand-700);font-weight:600}
.longform ul{list-style:disc;padding-left:22px;margin-bottom:14px;color:var(--ink-2)}
.longform ul li{margin-bottom:6px}
.notice-strip{display:flex;gap:12px;align-items:flex-start;background:var(--sun-soft);
  border:1px solid #f2dfa0;border-radius:var(--r-md);padding:16px 20px;font-size:var(--fs-sm);color:#7c5a10}