/* ==========================================================================
   ST站 · 设计系统 style.css
   风格定位：现代 / 可爱大气 / 专业（紫罗兰 × 珊瑚粉 × 薄荷绿）
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  /* 品牌色三档 */
  --brand-700:#5636D6;
  --brand-600:#6C4CF1;
  --brand-500:#7C5CFF;
  --brand-100:#EDE9FE;
  --brand-50:#F5F2FF;
  /* 点缀色 */
  --pink-500:#FF5E8E;
  --pink-100:#FFE4EC;
  --mint-500:#14C6B2;
  --mint-100:#DFFBF6;
  --amber-500:#FFAF1F;
  --amber-100:#FFF1D6;
  /* 中性色 */
  --ink-900:#211C3F;
  --ink-700:#423B66;
  --ink-500:#6E6892;
  --ink-300:#A6A1C6;
  --ink-100:#D9D6EC;
  --bg:#FAF9FF;
  --surface:#FFFFFF;
  --line:#ECE9F8;
  /* 渐变 */
  --grad-brand:linear-gradient(135deg,#7C5CFF 0%,#FF5E8E 100%);
  --grad-soft:linear-gradient(135deg,#F0EBFF 0%,#FFE9F1 100%);
  --grad-mint:linear-gradient(135deg,#14C6B2 0%,#5CD9FF 100%);
  /* 圆角 */
  --r-sm:10px; --r-md:16px; --r-lg:22px; --r-xl:28px; --r-full:999px;
  /* 阴影 */
  --sh-sm:0 2px 8px rgba(96,78,190,.08);
  --sh-md:0 8px 24px rgba(96,78,190,.12);
  --sh-lg:0 18px 48px rgba(96,78,190,.18);
  --sh-brand:0 10px 28px rgba(124,92,255,.35);
  --sh-pink:0 10px 28px rgba(255,94,142,.32);
  /* 布局 */
  --container:1160px;
  --gutter:24px;
  --ease:cubic-bezier(.22,.8,.32,1);
  /* 字号（流式） */
  --fs-xs:clamp(.78rem,.74rem + .2vw,.85rem);
  --fs-sm:clamp(.88rem,.84rem + .25vw,.96rem);
  --fs-base:clamp(.96rem,.92rem + .3vw,1.05rem);
  --fs-lg:clamp(1.1rem,1rem + .6vw,1.3rem);
  --fs-xl:clamp(1.35rem,1.15rem + 1vw,1.75rem);
  --fs-2xl:clamp(1.7rem,1.35rem + 1.8vw,2.4rem);
  --fs-hero:clamp(2.1rem,1.4rem + 3.4vw,3.6rem);
}

/* ---------- 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","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:var(--fs-base);
  line-height:1.7;
  color:var(--ink-700);
  background:var(--bg);
  overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--brand-600);text-decoration:none;transition:color .25s var(--ease)}
a:hover{color:var(--pink-500)}
ul,ol{list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none}
h1,h2,h3,h4,h5{color:var(--ink-900);line-height:1.25;font-weight:700;letter-spacing:-.01em}
h1{font-size:var(--fs-hero)}
h2{font-size:var(--fs-2xl)}
h3{font-size:var(--fs-xl)}
h4{font-size:var(--fs-lg)}
::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,5vw + 24px,96px)}
.section-alt{background:var(--surface)}
.grid{display:grid;gap:24px}
.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:1.2fr .8fr;align-items:center}
.grid-side-r{grid-template-columns:.8fr 1.2fr;align-items:center}
.center{text-align:center}
.muted{color:var(--ink-500)}
.small{font-size:var(--fs-sm)}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:var(--fs-xs);font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--brand-600);background:var(--brand-100);
  padding:6px 14px;border-radius:var(--r-full);margin-bottom:16px;
}
.section-head{max-width:640px;margin:0 auto 48px;text-align:center}
.section-head p{margin-top:12px;color:var(--ink-500)}
.divider-dot{color:var(--pink-500)}

/* ---------- 4. 文字标题组件 ---------- */
.ttl-underline{position:relative;z-index:0;display:inline-block}
.ttl-underline::after{
  content:"";position:absolute;left:0;right:0;bottom:.08em;height:.34em;
  background:linear-gradient(90deg,var(--pink-100),transparent);
  border-radius:4px;z-index:-1;
}
.grad-text{background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 28px;border-radius:var(--r-full);
  font-weight:700;font-size:var(--fs-sm);line-height:1.2;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
  will-change:transform;white-space:nowrap;
}
.btn:active{transform:scale(.96)}
.btn-primary{background:var(--grad-brand);color:#fff;box-shadow:var(--sh-brand)}
.btn-primary:hover{color:#fff;transform:translateY(-3px);box-shadow:0 16px 36px rgba(124,92,255,.45)}
.btn-pink{background:var(--pink-500);color:#fff;box-shadow:var(--sh-pink)}
.btn-pink:hover{color:#fff;transform:translateY(-3px)}
.btn-ghost{background:var(--surface);color:var(--ink-900);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-600);transform:translateY(-3px)}
.btn-sm{padding:9px 20px;font-size:var(--fs-xs)}
.btn-lg{padding:16px 36px;font-size:var(--fs-base)}
.btn-group{display:flex;flex-wrap:wrap;gap:14px}
.btn .ico{font-size:1.1em;line-height:1}

/* ---------- 6. 头部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(250,249,255,.85);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  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-sm)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;height:72px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--ink-900)}
.logo:hover{color:var(--ink-900)}
.logo-badge{
  width:38px;height:38px;border-radius:12px;background:var(--grad-brand);
  display:grid;place-items:center;color:#fff;font-weight:800;font-size:.95rem;
  box-shadow:var(--sh-brand);letter-spacing:-.02em;
}
.logo em{font-style:normal;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{
  padding:9px 16px;border-radius:var(--r-full);font-weight:600;font-size:var(--fs-sm);
  color:var(--ink-700);transition:background .25s,color .25s;
}
.nav-links a:hover{background:var(--brand-50);color:var(--brand-600)}
.nav-links a.is-active{background:var(--brand-100);color:var(--brand-700);font-weight:700}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:12px;
  flex-direction:column;align-items:center;justify-content:center;gap:5px;
}
.nav-toggle span{display:block;width:22px;height:2.5px;border-radius:2px;background:var(--ink-900);transition:transform .3s var(--ease),opacity .3s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
.nav-scrim{
  position:fixed;inset:0;z-index:98;background:rgba(33,28,63,.4);
  opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;
}
.nav-scrim.is-visible{opacity:1;visibility:visible}

/* ---------- 7. 卡片 ---------- */
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:28px;box-shadow:var(--sh-sm);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--sh-md);border-color:var(--brand-100)}
.card-ico{
  width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
  font-size:1.5rem;margin-bottom:18px;
}
.ico-brand{background:var(--brand-100)}
.ico-pink{background:var(--pink-100)}
.ico-mint{background:var(--mint-100)}
.ico-amber{background:var(--amber-100)}
.card h3{margin-bottom:10px}
.card p{color:var(--ink-500);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)}
.card-link .arrow{transition:transform .25s var(--ease)}
.card-link:hover .arrow{transform:translateX(4px)}

/* ---------- 8. Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  padding-block:clamp(48px,4vw + 32px,88px) clamp(64px,6vw,110px);
}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(560px 420px at 88% 6%,rgba(255,94,142,.14),transparent 65%),
    radial-gradient(680px 520px at 4% 96%,rgba(124,92,255,.16),transparent 65%);
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,4vw,64px);align-items:center}
.hero h1{margin-bottom:20px}
.hero h1 .grad-text{white-space:nowrap}
.hero-lead{font-size:var(--fs-lg);color:var(--ink-500);margin-bottom:32px;max-width:34em}
.hero-stats{display:flex;flex-wrap:wrap;gap:clamp(20px,3vw,44px);margin-top:40px}
.hero-stat b{display:block;font-size:var(--fs-xl);color:var(--ink-900);font-weight:800}
.hero-stat span{font-size:var(--fs-xs);color:var(--ink-500)}
.hero-visual{position:relative}
.hero-visual .hero-img{
  border-radius:var(--r-xl);box-shadow:var(--sh-lg);
  border:6px solid #fff;
  width:min(100%,460px);margin-inline:auto;
}
.float-chip{
  position:absolute;background:var(--surface);border-radius:18px;box-shadow:var(--sh-md);
  padding:12px 16px;display:flex;align-items:center;gap:10px;font-size:var(--fs-xs);font-weight:700;color:var(--ink-900);
}
.float-chip .dot{width:10px;height:10px;border-radius:50%;background:var(--pink-500);animation:pulse 1.6s infinite}
.float-chip small{display:block;font-weight:500;color:var(--ink-500)}
.chip-live{top:7%;left:-4%;animation:float 4.5s ease-in-out infinite}
.chip-hot{bottom:12%;right:-4%;animation:float 5.5s .6s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(255,94,142,.5)}50%{box-shadow:0 0 0 6px rgba(255,94,142,0)}}

/* ---------- 9. 跑马灯 ---------- */
.marquee{overflow:hidden;background:var(--ink-900);padding-block:16px}
.marquee-track{display:flex;gap:48px;width:max-content;animation:scroll 28s linear infinite}
.marquee-track span{color:#B9B0F0;font-weight:600;font-size:var(--fs-sm);display:inline-flex;align-items:center;gap:12px;white-space:nowrap}
.marquee-track .star{color:var(--pink-500)}
@keyframes scroll{to{transform:translateX(-50%)}}

/* ---------- 10. 视频卡 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:36px}
.filter-bar button{
  padding:9px 20px;border-radius:var(--r-full);background:var(--surface);
  border:1.5px solid var(--line);font-weight:600;font-size:var(--fs-sm);color:var(--ink-500);
  transition:all .25s var(--ease);
}
.filter-bar button:hover{border-color:var(--brand-500);color:var(--brand-600)}
.filter-bar button.is-on{background:var(--grad-brand);border-color:transparent;color:#fff;box-shadow:var(--sh-brand)}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;
  box-shadow:var(--sh-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--sh-md)}
.video-card.is-hidden{display:none}
.thumb{position:relative;overflow:hidden;aspect-ratio:16/9;background:var(--brand-50)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.video-card:hover .thumb img{transform:scale(1.06)}
.thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(33,28,63,.35));pointer-events:none}
.badge{
  position:absolute;top:12px;left:12px;z-index:2;
  padding:4px 12px;border-radius:var(--r-full);
  font-size:var(--fs-xs);font-weight:700;color:#fff;
}
.badge-live{background:var(--pink-500);display:inline-flex;align-items:center;gap:6px}
.badge-live::before{content:"";width:7px;height:7px;border-radius:50%;background:#fff;animation:pulse 1.4s infinite}
.badge-replay{background:rgba(33,28,63,.72);backdrop-filter:blur(4px)}
.badge-topic{background:var(--grad-mint)}
.duration{position:absolute;bottom:10px;right:12px;z-index:2;background:rgba(33,28,63,.72);color:#fff;font-size:var(--fs-xs);font-weight:600;padding:3px 9px;border-radius:8px}
.play-fab{
  position:absolute;inset:0;margin:auto;z-index:3;width:56px;height:56px;border-radius:50%;
  background:rgba(255,255,255,.92);display:grid;place-items:center;
  box-shadow:var(--sh-md);transition:transform .3s var(--ease);
}
.play-fab::before{content:"";border-style:solid;border-width:9px 0 9px 15px;border-color:transparent transparent transparent var(--brand-600);margin-left:4px}
.video-card:hover .play-fab{transform:scale(1.12)}
.video-meta{padding:18px 20px 20px}
.video-meta h3{font-size:var(--fs-base);margin-bottom:8px;line-height:1.45}
.video-meta .row{display:flex;justify-content:space-between;align-items:center;font-size:var(--fs-xs);color:var(--ink-500)}
.tag{display:inline-block;padding:2px 10px;border-radius:var(--r-full);background:var(--brand-50);color:var(--brand-600);font-weight:600}

/* ---------- 11. 榜单 ---------- */
.rank-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:26px;box-shadow:var(--sh-sm)}
.rank-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.rank-head .flame{font-size:1.3rem}
.rank-list li{
  display:flex;align-items:center;gap:14px;padding:13px 6px;border-bottom:1px dashed var(--line);
  transition:background .2s;border-radius:8px;
}
.rank-list li:last-child{border-bottom:none}
.rank-list li:hover{background:var(--brand-50)}
.rank-no{
  width:28px;height:28px;border-radius:9px;display:grid;place-items:center;flex-shrink:0;
  font-weight:800;font-size:.85rem;color:var(--ink-500);background:var(--ink-100);
}
li:nth-child(1) .rank-no{background:var(--pink-500);color:#fff}
li:nth-child(2) .rank-no{background:var(--brand-500);color:#fff}
li:nth-child(3) .rank-no{background:var(--amber-500);color:#fff}
.rank-list .t{flex:1;font-weight:600;color:var(--ink-900);font-size:var(--fs-sm);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rank-list .heat{font-size:var(--fs-xs);color:var(--pink-500);font-weight:700;flex-shrink:0}

/* ---------- 12. 话题/文章列表 ---------- */
.post-list{display:grid;gap:20px}
.post-item{
  display:grid;grid-template-columns:220px 1fr;gap:22px;align-items:center;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:18px;box-shadow:var(--sh-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.post-item:hover{transform:translateY(-4px);box-shadow:var(--sh-md)}
.post-item .thumb{border-radius:var(--r-md);aspect-ratio:16/10}
.post-item h3{font-size:var(--fs-lg);margin-bottom:8px}
.post-item p{color:var(--ink-500);font-size:var(--fs-sm);margin-bottom:10px}
.post-meta{display:flex;flex-wrap:wrap;gap:14px;font-size:var(--fs-xs);color:var(--ink-300)}
.post-meta b{color:var(--brand-600)}

/* ---------- 13. 数据/特性 ---------- */
.stats-band{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat-tile{
  background:var(--grad-soft);border-radius:var(--r-lg);padding:30px 20px;text-align:center;
  transition:transform .3s var(--ease);
}
.stat-tile:hover{transform:translateY(-6px)}
.stat-tile b{display:block;font-size:var(--fs-2xl);font-weight:800;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-tile span{font-size:var(--fs-xs);color:var(--ink-500);font-weight:600}
.feature-list{display:grid;gap:18px;margin-top:28px}
.feature-list li{display:flex;gap:14px;align-items:flex-start}
.feature-list .chk{
  width:26px;height:26px;border-radius:8px;flex-shrink:0;display:grid;place-items:center;
  background:var(--mint-100);color:var(--mint-500);font-weight:800;font-size:.85rem;margin-top:3px;
}
.feature-list b{color:var(--ink-900)}
.feature-list p{font-size:var(--fs-sm);color:var(--ink-500)}
.img-rounded{border-radius:var(--r-xl);box-shadow:var(--sh-lg);border:6px solid #fff}

/* ---------- 14. 评价 ---------- */
.quote-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:28px;box-shadow:var(--sh-sm)}
.quote-card .stars{color:var(--amber-500);letter-spacing:2px;margin-bottom:14px;font-size:.9rem}
.quote-card p{color:var(--ink-700);font-size:var(--fs-sm);margin-bottom:20px}
.quote-user{display:flex;align-items:center;gap:12px}
.avatar{
  width:44px;height:44px;border-radius:50%;display:grid;place-items:center;flex-shrink:0;
  color:#fff;font-weight:800;font-size:1rem;
}
.av-1{background:var(--grad-brand)}
.av-2{background:linear-gradient(135deg,#FF5E8E,#FFAF1F)}
.av-3{background:var(--grad-mint)}
.av-4{background:linear-gradient(135deg,#6C4CF1,#14C6B2)}
.quote-user b{display:block;color:var(--ink-900);font-size:var(--fs-sm)}
.quote-user span{font-size:var(--fs-xs);color:var(--ink-500)}

/* ---------- 15. CTA/下载 ---------- */
.cta-band{
  position:relative;overflow:hidden;border-radius:var(--r-xl);
  background:linear-gradient(135deg,#5636D6 0%,#7C5CFF 45%,#FF5E8E 100%);
  padding:clamp(40px,5vw,72px) clamp(24px,5vw,64px);text-align:center;color:#fff;
  box-shadow:var(--sh-lg);
}
.cta-band::before,.cta-band::after{
  content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.12);
}
.cta-band::before{width:260px;height:260px;top:-90px;right:-60px}
.cta-band::after{width:180px;height:180px;bottom:-70px;left:8%}
.cta-band h2,.cta-band h3{color:#fff}
.cta-band p{color:rgba(255,255,255,.86);max-width:36em;margin:14px auto 32px}
.cta-band .btn-ghost{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.4);color:#fff;backdrop-filter:blur(4px)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.24);color:#fff}
.cta-note{margin-top:18px;font-size:var(--fs-xs);color:rgba(255,255,255,.7)}

/* ---------- 16. FAQ ---------- */
.faq-list{max-width:760px;margin-inline:auto;display:grid;gap:14px}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;transition:box-shadow .3s}
.faq-item.is-open{box-shadow:var(--sh-md);border-color:var(--brand-100)}
.faq-q{
  width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:20px 24px;text-align:left;font-weight:700;color:var(--ink-900);font-size:var(--fs-sm);
}
.faq-q .sign{
  width:28px;height:28px;border-radius:9px;flex-shrink:0;display:grid;place-items:center;
  background:var(--brand-100);color:var(--brand-600);font-weight:800;
  transition:transform .3s var(--ease),background .3s;
}
.faq-item.is-open .sign{transform:rotate(45deg);background:var(--grad-brand);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s var(--ease)}
.faq-a-inner{padding:0 24px 22px;color:var(--ink-500);font-size:var(--fs-sm)}

/* ---------- 17. 提示条/弹层 ---------- */
.modal{
  position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:20px;
  opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;
}
.modal.is-open{opacity:1;visibility:visible}
.modal-scrim{position:absolute;inset:0;background:rgba(23,18,48,.78);backdrop-filter:blur(6px)}
.modal-box{
  position:relative;width:min(880px,100%);background:#12102A;border-radius:var(--r-lg);
  overflow:hidden;box-shadow:var(--sh-lg);transform:scale(.94);transition:transform .3s var(--ease);
}
.modal.is-open .modal-box{transform:scale(1)}
.modal-box video,.modal-box .player-mock{width:100%;aspect-ratio:16/9;display:block;object-fit:cover}
.modal-close{
  position:absolute;top:12px;right:12px;z-index:5;width:38px;height:38px;border-radius:50%;
  background:rgba(255,255,255,.16);color:#fff;display:grid;place-items:center;font-size:1.1rem;
  transition:background .25s;
}
.modal-close:hover{background:var(--pink-500)}
.modal-caption{padding:16px 22px;color:#D9D6EC;font-size:var(--fs-sm)}
.modal-caption b{color:#fff}
.player-mock{
  position:relative;background:
    radial-gradient(400px 220px at 50% 42%,rgba(124,92,255,.4),transparent 70%),#12102A;
  display:grid;place-items:center;
}
.player-mock .rec{color:#fff;font-weight:800;font-size:1rem;display:inline-flex;gap:10px;align-items:center;opacity:.85}
.player-mock .rec i{width:12px;height:12px;border-radius:50%;background:var(--pink-500);display:inline-block;animation:pulse 1.4s infinite}
.toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,80px);z-index:300;
  background:var(--ink-900);color:#fff;padding:12px 24px;border-radius:var(--r-full);
  font-size:var(--fs-sm);font-weight:600;box-shadow:var(--sh-lg);opacity:0;
  transition:transform .35s var(--ease),opacity .35s;pointer-events:none;
}
.toast.is-show{transform:translate(-50%,0);opacity:1}

/* ---------- 18. 页脚 ---------- */
.site-footer{background:var(--ink-900);color:#A6A1C6;padding:64px 0 32px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:36px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.site-footer .logo{color:#fff}
.site-footer h4{color:#fff;font-size:var(--fs-sm);margin-bottom:16px}
.site-footer ul li{margin-bottom:10px}
.site-footer ul a{color:#A6A1C6;font-size:var(--fs-sm)}
.site-footer ul a:hover{color:#fff}
.footer-about p{font-size:var(--fs-sm);margin:14px 0 18px;line-height:1.8}
.footer-cloud{display:flex;flex-wrap:wrap;gap:8px}
.footer-cloud a{
  font-size:var(--fs-xs);color:#B9B0F0;background:rgba(124,92,255,.16);
  padding:4px 12px;border-radius:var(--r-full);transition:background .25s,color .25s;
}
.footer-cloud a:hover{background:var(--brand-500);color:#fff}
.footer-bottom{padding-top:26px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:var(--fs-xs);color:#6E6892}
.footer-disclaimer{font-size:var(--fs-xs);color:#6E6892;line-height:1.8;padding-top:18px;max-width:60em}

/* ---------- 19. 内页页头 ---------- */
.page-hero{
  position:relative;overflow:hidden;text-align:center;
  padding:clamp(56px,5vw + 20px,84px) 0 clamp(48px,4vw,72px);
}
.page-hero::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(520px 300px at 82% 0%,rgba(255,94,142,.13),transparent 65%),
    radial-gradient(560px 340px at 12% 100%,rgba(124,92,255,.15),transparent 65%);
}
.page-hero h1{font-size:var(--fs-2xl);margin-bottom:14px}
.page-hero p{max-width:40em;margin-inline:auto;color:var(--ink-500)}
.breadcrumb{display:flex;justify-content:center;gap:8px;font-size:var(--fs-xs);color:var(--ink-300);margin-bottom:18px}
.breadcrumb a{color:var(--ink-500)}
.breadcrumb a:hover{color:var(--brand-600)}

/* ---------- 20. 分页 ---------- */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:44px}
.pagination a,.pagination span{
  min-width:42px;height:42px;padding:0 14px;display:inline-grid;place-items:center;
  border-radius:12px;background:var(--surface);border:1.5px solid var(--line);
  font-weight:700;font-size:var(--fs-sm);color:var(--ink-500);transition:all .25s var(--ease);
}
.pagination a:hover{border-color:var(--brand-500);color:var(--brand-600);transform:translateY(-2px)}
.pagination .is-cur{background:var(--grad-brand);border-color:transparent;color:#fff;box-shadow:var(--sh-brand)}

/* ---------- 21. 滚动动画 ---------- */
[data-reveal]{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
  [data-reveal]{opacity:1;transform:none}
}

/* ---------- 22. 响应式 ---------- */
@media (max-width:1080px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .chip-live{left:0}
  .chip-hot{right:0}
}
@media (max-width:960px){
  .nav-links{
    position:fixed;top:0;right:0;bottom:0;z-index:99;
    width:min(300px,82vw);background:var(--surface);
    flex-direction:column;align-items:stretch;gap:4px;
    padding:96px 24px 32px;box-shadow:var(--sh-lg);
    transform:translateX(105%);transition:transform .35s var(--ease);
  }
  .nav-links.is-open{transform:none}
  .nav-links a{padding:14px 18px;font-size:1rem;border-radius:14px}
  .nav-toggle{display:flex}
  .nav-cta .btn{display:none}
  .hero-grid,.grid-side,.grid-side-r{grid-template-columns:1fr}
  .grid-side .img-rounded,.grid-side-r .img-rounded{order:-1}
  .hero-visual{max-width:480px;margin-inline:auto;width:100%}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .stats-band{grid-template-columns:repeat(2,1fr)}
  .post-item{grid-template-columns:1fr}
  .post-item .thumb{aspect-ratio:16/8}
}
@media (max-width:680px){
  :root{--gutter:18px}
  .grid-2,.grid-3,.grid-4,.video-grid{grid-template-columns:1fr}
  .btn-group .btn{flex:1 1 100%}
  .hero{padding-block:40px 64px}
  .float-chip{transform:scale(.88);transform-origin:left top}
  .chip-hot{transform-origin:right bottom;transform:scale(.88)}
  .chip-hot.is-anim{animation:float 5.5s .6s ease-in-out infinite}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .stats-band{grid-template-columns:repeat(2,1fr);gap:12px}
  .filter-bar{justify-content:flex-start}
  .post-item{padding:14px}
}

/* ---------- 23. 附加组件（内页专用） ---------- */
/* 手机模型 */
.phone-mock{
  width:min(300px,72vw);margin-inline:auto;background:var(--ink-900);
  border-radius:44px;padding:12px;box-shadow:var(--sh-lg);
}
.phone-screen{border-radius:34px;overflow:hidden;position:relative;aspect-ratio:9/17.5;background:#12102A}
.phone-screen img{width:100%;height:100%;object-fit:cover}
.phone-notch{position:absolute;top:8px;left:50%;transform:translateX(-50%);width:86px;height:22px;background:var(--ink-900);border-radius:var(--r-full);z-index:2}
.float-cell{
  position:absolute;left:8px;right:8px;bottom:10px;z-index:2;
  background:rgba(18,16,42,.82);backdrop-filter:blur(8px);border-radius:16px;
  padding:10px 14px;color:#fff;font-size:var(--fs-xs);
  display:flex;align-items:center;justify-content:space-between;gap:10px;
}
/* 下载渠道卡 */
.store-card{display:flex;align-items:center;gap:16px;text-align:left}
.store-card .card-ico{margin-bottom:0;font-size:1.7rem}
.store-card b{display:block;color:var(--ink-900)}
.store-card small{color:var(--ink-500)}
/* 步骤 */
.steps{counter-reset:step;display:grid;gap:22px}
.step{display:flex;gap:18px;align-items:flex-start}
.step-no{
  counter-increment:step;flex-shrink:0;width:44px;height:44px;border-radius:14px;
  background:var(--grad-brand);color:#fff;font-weight:800;display:grid;place-items:center;
  box-shadow:var(--sh-brand);font-size:1.05rem;
}
.step-no::before{content:counter(step)}
.step h4{margin-bottom:4px}
.step p{font-size:var(--fs-sm);color:var(--ink-500)}
/* 功能矩阵 */
.matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.matrix .card{padding:22px}
.matrix .card-ico{width:44px;height:44px;font-size:1.25rem;margin-bottom:12px;border-radius:13px}
.matrix h4{font-size:var(--fs-base);margin-bottom:6px}
.matrix p{font-size:var(--fs-xs)}
/* 条款卡 */
.legal-card{background:var(--brand-50);border:1px dashed var(--ink-100);border-radius:var(--r-md);padding:22px 26px}
.legal-card h4{margin-bottom:10px}
.legal-card p{font-size:var(--fs-sm);color:var(--ink-500)}
@media (max-width:960px){.matrix{grid-template-columns:repeat(2,1fr)}}
@media (max-width:680px){.matrix{grid-template-columns:1fr}}