/* ==========================================================================
   七暖影音 · 官方网站样式（零依赖 · 无外部字体 / 图床 / CDN）
   配色与 App 保持一致：src/styles/main.css
   ========================================================================== */
:root{
  --bg:#0B0D12; --bg-elevated:#141821; --bg-card:#1A1F2B; --bg-deep:#070910;
  --line:rgba(255,255,255,.08); --line-soft:rgba(255,255,255,.05);
  --text:#F3F0E8; --text-muted:#9AA3B5; --text-dim:#6B7488;
  --gold:#E8B84A; --gold-deep:#C99A2E; --gold-light:#F2D48A;
  --gold-soft:rgba(232,184,74,.16); --gold-line:rgba(232,184,74,.28);
  --success:#5DCE8A; --danger:#E07A6A;
  --glass:rgba(255,255,255,.04); --glass-strong:rgba(255,255,255,.07);
  --shadow-soft:0 2px 10px rgba(0,0,0,.4);
  --shadow-glass:0 8px 28px rgba(0,0,0,.45), inset 0 1px 0 rgba(255,255,255,.06);
  --shadow-deep:0 24px 60px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.05);
  --shadow-gold:0 14px 38px rgba(232,184,74,.22);
  --grad-gold:linear-gradient(135deg,#E8B84A 0%,#F2D48A 100%);
  --grad-dark:linear-gradient(160deg,#1A1F2B 0%,#141821 55%,#0B0D12 100%);
  --radius:16px; --radius-lg:24px;
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'DIN Alternate','Avenir Next',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Noto Sans SC','Microsoft YaHei',sans-serif;
  color:var(--text); background:var(--bg); line-height:1.65;
  -webkit-font-smoothing:antialiased; overflow-x:hidden; position:relative;
}
body::before,body::after{content:'';position:fixed;border-radius:50%;filter:blur(120px);pointer-events:none;z-index:0}
body::before{width:600px;height:600px;top:-220px;left:-200px;background:radial-gradient(circle,rgba(232,184,74,.16) 0%,rgba(232,184,74,0) 70%)}
body::after{width:720px;height:720px;top:18%;right:-300px;background:radial-gradient(circle,rgba(110,181,224,.10) 0%,rgba(110,181,224,0) 70%)}
a{color:inherit;text-decoration:none}
ul{list-style:none}
/* height:auto 必须写——img 上有 width/height 属性时，若 CSS 只约束宽度，
   浏览器会把属性里的 height 当作实际高度，导致图片纵向拉伸变形 */
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px;position:relative;z-index:1}
.ic{width:22px;height:22px;flex-shrink:0}

/* ===== 导航 ===== */
.nav{position:sticky;top:0;z-index:100;background:rgba(11,13,18,.72);
  backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px);
  border-bottom:1px solid var(--line-soft)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:19px;letter-spacing:.5px}
.brand .logo{width:36px;height:36px;border-radius:10px;background:var(--bg-card);display:grid;place-items:center;
  border:1px solid var(--gold-line);color:var(--gold)}
.brand small{display:block;font-size:10px;font-weight:600;color:var(--text-dim);letter-spacing:2px;margin-top:1px}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:14.5px;font-weight:600;color:var(--text-muted);transition:color .2s}
.nav-links a:hover{color:var(--gold)}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:14.5px;border-radius:999px;
  padding:11px 22px;cursor:pointer;border:none;transition:transform .25s var(--ease-spring),box-shadow .25s;white-space:nowrap}
.btn-primary{background:var(--grad-gold);color:#1A1206;box-shadow:var(--shadow-gold)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 44px rgba(232,184,74,.34)}
.btn-ghost{background:var(--glass-strong);color:var(--text);border:1px solid var(--line)}
.btn-ghost:hover{transform:translateY(-2px);border-color:var(--gold-line)}
.nav-toggle{display:none;background:none;border:none;font-size:24px;color:var(--text);cursor:pointer}

/* ===== Hero ===== */
.hero{padding:74px 0 60px;position:relative}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.tag{display:inline-flex;align-items:center;gap:8px;background:var(--gold-soft);border:1px solid var(--gold-line);
  border-radius:999px;padding:6px 15px;font-size:12.5px;font-weight:700;color:var(--gold);margin-bottom:22px}
.tag .dot{width:7px;height:7px;border-radius:50%;background:var(--success);box-shadow:0 0 0 4px rgba(93,206,138,.18);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.45}}
.hero h1{font-size:clamp(33px,4.5vw,54px);line-height:1.18;font-weight:800;letter-spacing:-.5px}
.hero h1 .hl{background:var(--grad-gold);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p.lead{margin:22px 0 32px;font-size:clamp(15px,1.4vw,17.5px);color:var(--text-muted);max-width:540px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;align-items:center}

/* 真机截图相框 */
.phone-wrap{display:flex;justify-content:center;position:relative}
.phone-wrap::before{content:'';position:absolute;inset:-30px;background:var(--grad-gold);filter:blur(70px);opacity:.16;border-radius:50%;z-index:0}
.phone{width:272px;background:#000;border-radius:40px;padding:9px;position:relative;z-index:1;
  box-shadow:var(--shadow-deep);border:1px solid rgba(255,255,255,.12)}
.phone img{border-radius:32px;width:100%}
.float-pill{position:absolute;z-index:2;background:rgba(26,31,43,.9);border:1px solid var(--line);
  box-shadow:var(--shadow-glass);border-radius:13px;padding:10px 14px;font-size:12px;font-weight:700;
  display:flex;align-items:center;gap:8px;backdrop-filter:blur(10px)}
.float-pill .ic{width:17px;height:17px;color:var(--gold)}
.fp1{top:58px;left:-16px;animation:floaty 4s ease-in-out infinite}
.fp2{bottom:88px;right:-18px;animation:floaty 4s ease-in-out infinite .8s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* ===== 数据条 ===== */
/* margin 必须写 auto——本元素同时带 .wrap，若这里写 margin:14px 0 6px
   会覆盖 .wrap 的 margin:0 auto，导致整块贴左错位 */
.stats{margin:14px auto 6px}
.stats-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;background:var(--glass);
  border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px 22px;box-shadow:var(--shadow-glass)}
.stat{text-align:center}
.stat b{display:block;font-size:clamp(23px,2.7vw,31px);font-weight:800;
  background:var(--grad-gold);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat span{font-size:12.5px;color:var(--text-dim);font-weight:600}

/* ===== Section 通用 ===== */
section{padding:70px 0;position:relative}
.sec-head{text-align:center;max-width:660px;margin:0 auto 44px}
.sec-tag{display:inline-block;font-size:12px;font-weight:800;letter-spacing:3px;color:var(--gold);text-transform:uppercase;margin-bottom:13px}
.sec-head h2{font-size:clamp(25px,3.1vw,37px);font-weight:800;letter-spacing:-.5px}
.sec-head p{margin-top:13px;color:var(--text-muted);font-size:15.5px}

/* 功能卡 */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{background:var(--glass);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px 25px;
  transition:transform .3s var(--ease-spring),border-color .3s,box-shadow .3s;position:relative;overflow:hidden}
.feat::after{content:'';position:absolute;top:-40px;right:-40px;width:120px;height:120px;
  background:var(--grad-gold);opacity:0;filter:blur(34px);transition:opacity .3s}
.feat:hover{transform:translateY(-7px);border-color:var(--gold-line);box-shadow:var(--shadow-deep)}
.feat:hover::after{opacity:.14}
.feat .ficon{width:52px;height:52px;border-radius:15px;background:var(--gold-soft);border:1px solid var(--gold-line);
  display:grid;place-items:center;color:var(--gold);margin-bottom:17px}
.feat .ficon .ic{width:26px;height:26px}
.feat h3{font-size:18px;font-weight:800;margin-bottom:8px}
.feat p{color:var(--text-muted);font-size:14px}
.feat .pill{display:inline-block;margin-top:12px;font-size:12px;font-weight:700;color:var(--gold);
  background:var(--gold-soft);border-radius:999px;padding:4px 11px}

/* 价格 */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:900px;margin:0 auto}
.plan{background:var(--glass);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px 24px;text-align:center;position:relative;transition:transform .3s var(--ease-spring),border-color .3s}
.plan:hover{transform:translateY(-6px);border-color:var(--gold-line)}
.plan.rec{border-color:var(--gold-line);background:linear-gradient(180deg,rgba(232,184,74,.08),rgba(255,255,255,.02))}
.plan .badge{position:absolute;top:-11px;left:50%;transform:translateX(-50%);background:var(--grad-gold);color:#1A1206;
  font-size:11.5px;font-weight:800;border-radius:999px;padding:4px 14px;white-space:nowrap}
.plan h4{font-size:17px;font-weight:800;margin-bottom:12px}
.plan .price{font-size:36px;font-weight:800;color:var(--gold);line-height:1.15}
.plan .price em{font-size:15px;font-style:normal;color:var(--text-muted);font-weight:600}
.plan .was{font-size:13px;color:var(--text-dim);text-decoration:line-through;margin-top:5px}
.plan .days{margin-top:14px;font-size:13px;color:var(--text-muted);border-top:1px solid var(--line);padding-top:14px}
.plan-note{text-align:center;margin-top:26px;font-size:13.5px;color:var(--text-dim)}

/* 流程 */
.flow{background:var(--grad-dark);border:1px solid var(--line);border-radius:var(--radius-lg);padding:50px 38px;
  box-shadow:var(--shadow-deep);position:relative;overflow:hidden}
.flow::before{content:'';position:absolute;top:-90px;right:-90px;width:290px;height:290px;
  background:radial-gradient(circle,rgba(232,184,74,.14),transparent 70%)}
.flow-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;position:relative;z-index:1}
.step{text-align:center}
.step .n{width:50px;height:50px;border-radius:50%;background:var(--gold-soft);border:1.5px solid var(--gold-line);
  color:var(--gold);display:grid;place-items:center;font-size:21px;font-weight:800;margin:0 auto 15px}
.step h4{font-size:17px;font-weight:800;margin-bottom:7px}
.step p{font-size:13.5px;color:var(--text-muted)}

/* 截图画廊 */
.shots{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.shot{background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);padding:12px;
  transition:transform .3s var(--ease-spring),border-color .3s}
.shot:hover{transform:translateY(-6px);border-color:var(--gold-line)}
.shot img{border-radius:11px;background:#000}
.shot b{display:block;text-align:center;font-size:13px;font-weight:700;margin-top:12px}
.shot span{display:block;text-align:center;font-size:12px;color:var(--text-dim);margin-top:2px}

/* 为什么 */
.why-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.why{display:flex;gap:16px;background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
  padding:23px 25px;align-items:flex-start}
.why .wi{width:44px;height:44px;border-radius:12px;background:var(--gold-soft);border:1px solid var(--gold-line);
  color:var(--gold);display:grid;place-items:center;flex-shrink:0}
.why h4{font-size:16.5px;font-weight:800;margin-bottom:5px}
.why p{font-size:13.5px;color:var(--text-muted)}

/* 下载 */
.download{background:var(--glass);border:1px solid var(--line);border-radius:var(--radius-lg);padding:52px;
  text-align:center;box-shadow:var(--shadow-deep)}
.download h2{font-size:clamp(23px,2.9vw,34px);font-weight:800;letter-spacing:-.5px}
.download p{margin:13px auto 26px;color:var(--text-muted);font-size:15.5px;max-width:520px}
.dl-btns{display:flex;gap:13px;flex-wrap:wrap;justify-content:center}
.dl-btn{display:flex;align-items:center;gap:12px;background:var(--grad-gold);color:#1A1206;border-radius:15px;
  padding:13px 21px;transition:transform .25s var(--ease-spring);box-shadow:var(--shadow-gold);text-align:left}
.dl-btn:hover{transform:translateY(-3px)}
.dl-btn.soon{background:var(--bg-card);color:var(--text-muted);border:1px solid var(--line);box-shadow:none;cursor:default}
.dl-btn.soon:hover{transform:none}
.dl-btn .ic{width:26px;height:26px}
.dl-btn small{display:block;font-size:11px;opacity:.75;font-weight:600}
.dl-btn b{font-size:14.5px;font-weight:800}

/* ===== 正文页（协议 / 隐私） ===== */
.doc{padding:52px 0 70px;max-width:820px;margin:0 auto}
.doc-head{border-bottom:1px solid var(--line);padding-bottom:26px;margin-bottom:34px}
.doc-head h1{font-size:clamp(26px,3.4vw,38px);font-weight:800;letter-spacing:-.5px}
.doc-head .meta{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px 22px;font-size:13px;color:var(--text-dim)}
.doc h2{font-size:19px;font-weight:800;margin:36px 0 14px;padding-left:13px;border-left:3px solid var(--gold)}
.doc h3{font-size:16px;font-weight:800;margin:24px 0 10px;color:var(--gold-light)}
.doc p{color:var(--text-muted);font-size:15px;margin-bottom:13px}
.doc ol,.doc ul{margin:0 0 15px 0;padding-left:0;list-style:none;counter-reset:li}
.doc ol>li{counter-increment:li;position:relative;padding-left:30px;color:var(--text-muted);font-size:15px;margin-bottom:10px}
.doc ol>li::before{content:counter(li);position:absolute;left:0;top:2px;width:20px;height:20px;border-radius:6px;
  background:var(--gold-soft);color:var(--gold);font-size:11.5px;font-weight:800;display:grid;place-items:center}
.doc ul>li{position:relative;padding-left:22px;color:var(--text-muted);font-size:15px;margin-bottom:10px}
.doc ul>li::before{content:'';position:absolute;left:6px;top:10px;width:6px;height:6px;border-radius:50%;background:var(--gold)}
.doc strong{color:var(--text);font-weight:700}
.doc table{width:100%;border-collapse:collapse;margin:16px 0 22px;font-size:14px}
.doc th,.doc td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
.doc th{color:var(--gold);font-weight:700;background:var(--glass);font-size:13px}
.doc td{color:var(--text-muted)}
.doc td:first-child{color:var(--text);font-weight:600;white-space:nowrap}
.doc .callout{background:var(--glass);border:1px solid var(--line);border-left:3px solid var(--gold);
  border-radius:10px;padding:16px 20px;margin:20px 0;font-size:14px;color:var(--text-muted)}
.doc-back{display:inline-flex;align-items:center;gap:7px;font-size:14px;font-weight:700;color:var(--text-muted);margin-bottom:26px;transition:color .2s}
.doc-back:hover{color:var(--gold)}
.toc{background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin-bottom:34px}
.toc b{display:block;font-size:13px;font-weight:800;color:var(--gold);letter-spacing:1px;margin-bottom:12px}
.toc ol{margin:0;list-style:none;counter-reset:none;display:grid;grid-template-columns:1fr 1fr;gap:7px 20px}
.toc ol>li{counter-increment:none;padding-left:0;margin-bottom:0;font-size:13.5px}
.toc ol>li::before{display:none}
.toc a{color:var(--text-muted);transition:color .2s}
.toc a:hover{color:var(--gold)}

/* ===== Footer ===== */
footer{margin-top:36px;background:var(--bg-deep);border-top:1px solid var(--line);
  color:var(--text-muted);position:relative;z-index:1;padding:50px 0 26px}
.f-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.3fr;gap:34px;padding-bottom:32px;border-bottom:1px solid var(--line)}
.f-brand .brand{color:var(--text);margin-bottom:15px}
.f-brand p{font-size:13px;line-height:1.85;color:var(--text-dim);max-width:330px}
.f-col h5{color:var(--text);font-size:14.5px;font-weight:800;margin-bottom:16px}
.f-col a,.f-col p{display:block;font-size:13px;color:var(--text-dim);margin-bottom:10px;transition:color .2s}
.f-col a:hover{color:var(--gold)}
.certs{display:flex;flex-wrap:wrap;gap:8px 20px;margin:24px 0 16px;font-size:12px;color:var(--text-dim)}
.certs span{display:inline-flex;align-items:center;gap:6px}
.disclaimer{font-size:12.5px;line-height:1.85;color:var(--text-dim);background:var(--glass);
  border:1px solid var(--line);border-radius:11px;padding:15px 19px;margin:6px 0 20px}
.f-bottom{display:flex;flex-wrap:wrap;gap:8px 22px;align-items:center;justify-content:center;
  font-size:12.5px;color:var(--text-dim);text-align:center}
.f-bottom a{color:var(--text-muted);transition:color .2s}
.f-bottom a:hover{color:var(--gold)}
.f-bottom .police{display:inline-flex;align-items:center;gap:6px}
.f-bottom .police svg{width:14px;height:14px}
.todo{color:var(--text-dim);border-bottom:1px dashed var(--text-dim);padding-bottom:1px}

/* 返回顶部 */
#toTop{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:13px;background:var(--grad-gold);
  color:#1A1206;display:grid;place-items:center;box-shadow:var(--shadow-gold);opacity:0;pointer-events:none;
  transition:opacity .3s,transform .3s var(--ease-spring);z-index:90;cursor:pointer;border:none}
#toTop.show{opacity:1;pointer-events:auto}
#toTop:hover{transform:translateY(-4px)}

/* reveal（渐进增强：无 JS 时默认可见，不影响 SEO） */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s var(--ease-spring)}
.js .reveal.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .nav-links{position:fixed;inset:66px 0 auto 0;flex-direction:column;background:rgba(11,13,18,.97);
    backdrop-filter:blur(20px);padding:16px 24px;gap:2px;box-shadow:var(--shadow-deep);transform:translateY(-135%);
    transition:transform .35s var(--ease-spring);align-items:stretch;border-bottom:1px solid var(--line)}
  .nav-links.open{transform:none}
  .nav-links a{padding:13px 8px;border-bottom:1px solid var(--line-soft)}
  .nav-links .btn{margin-top:10px;justify-content:center}
  .nav-toggle{display:block}
  .hero-grid{grid-template-columns:1fr;gap:42px}
  .phone-wrap{order:-1}
  .features{grid-template-columns:1fr 1fr}
  .shots{grid-template-columns:1fr 1fr}
  .flow-grid,.stats-inner{grid-template-columns:1fr 1fr}
  .why-grid{grid-template-columns:1fr}
  .plans{grid-template-columns:1fr}
  .download{padding:32px}
  .f-grid{grid-template-columns:1fr 1fr;gap:26px}
  .toc ol{grid-template-columns:1fr}
}
@media(max-width:560px){
  .features,.shots{grid-template-columns:1fr}
  .stats-inner{grid-template-columns:1fr 1fr;gap:20px}
  .flow-grid{grid-template-columns:1fr}
  .f-grid{grid-template-columns:1fr}
  .hero{padding:44px 0 36px}
  section{padding:50px 0}
  .doc{padding:36px 0 54px}
  .doc table{font-size:13px}
  .doc th,.doc td{padding:9px 10px}
}