/* 汽水音乐 · site.css — 页面级样式 */

/* ============ Header ============ */
.header{position:sticky;top:0;left:0;right:0;z-index:90;background:rgba(255,255,255,.88);backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:box-shadow .25s var(--ease),border-color .25s var(--ease)}
.header.is-stuck{box-shadow:0 4px 18px rgba(6,42,34,.08);border-bottom-color:var(--line)}
.nav-shell{display:flex;align-items:center;gap:18px;min-height:70px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;white-space:nowrap;flex:0 0 auto}
.brand img{width:36px;height:36px;border-radius:10px;box-shadow:var(--sh)}
.brand-name{letter-spacing:-.02em}
.main-nav{margin-left:auto;display:flex;align-items:center;gap:2px}
.main-nav a{display:inline-flex;align-items:center;min-height:40px;padding:8px 14px;border-radius:10px;font-size:15px;font-weight:600;color:var(--ink-2);transition:color .2s,background .2s}
.main-nav a:hover{color:var(--brand-d);background:var(--bg-2)}
.main-nav a[aria-current="page"]{color:var(--brand-d);background:var(--soda)}
.nav-download{flex:0 0 auto;display:inline-flex;align-items:center;gap:6px;min-height:42px;padding:9px 20px;border-radius:11px;background:var(--grad);color:#052a22;font-weight:700;font-size:14.5px;box-shadow:var(--sh-brand);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.nav-download:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(10,156,134,.32)}
.nav-menu{display:none;width:44px;height:44px;border-radius:11px;border:1px solid var(--line);background:var(--card);cursor:pointer;position:relative;flex:0 0 auto}
.nav-menu span{position:absolute;left:50%;top:50%;width:20px;height:2px;margin:-1px 0 0 -10px;background:var(--ink);border-radius:2px;transition:background .2s}
.nav-menu span::before,.nav-menu span::after{content:"";position:absolute;left:0;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s var(--ease)}
.nav-menu span::before{top:-6px}
.nav-menu span::after{top:6px}
.header.is-open .nav-menu span{background:transparent}
.header.is-open .nav-menu span::before{transform:translateY(6px) rotate(45deg)}
.header.is-open .nav-menu span::after{transform:translateY(-6px) rotate(-45deg)}

/* ============ Hero ============ */
.hero{position:relative;padding:76px 0 88px;background:radial-gradient(680px 420px at 88% 6%,rgba(255,214,102,.3),transparent 62%),radial-gradient(560px 420px at 4% 10%,rgba(86,214,158,.22),transparent 60%),linear-gradient(180deg,#f8fdfb 0%,var(--bg) 100%);overflow:hidden}
.side-caption{position:absolute;left:18px;top:50%;transform:translateY(-50%) rotate(180deg);writing-mode:vertical-rl;font-size:11px;font-weight:700;letter-spacing:.32em;color:#a9c4bb;text-transform:uppercase;pointer-events:none}
.hero-inner{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center;position:relative;z-index:1}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--brand-d);background:var(--card);border:1px solid var(--line);border-radius:999px;padding:7px 14px;box-shadow:var(--sh);margin:0 0 20px}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px var(--soda)}
.hero h1{font-size:clamp(30px,4.2vw,52px);letter-spacing:-.02em}
.hero h1 em{font-style:normal;color:var(--brand-d);background:linear-gradient(180deg,transparent 60%,var(--accent-soft) 60%)}
.hero-lede{font-size:17px;color:var(--ink-2);max-width:540px;margin:18px 0 28px}
.download-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:24px}
.download-actions--center{justify-content:center}
.hero-photo{position:relative}
.hero-photo img{width:100%;filter:drop-shadow(0 20px 40px rgba(6,42,34,.1))}

/* ============ Feature Main ============ */
.feature-main{padding:92px 0;background:var(--bg)}
.feature-guide{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature-guide article{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:26px 24px;box-shadow:var(--sh);transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s}
.feature-guide article:hover{transform:translateY(-5px);box-shadow:var(--sh-lg);border-color:#bfe4d8}
.guide-line{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.guide-line .icon{width:30px;height:30px;padding:6px;border-radius:9px;background:var(--soda);color:var(--brand-d);box-sizing:content-box}
.guide-line h3{font-size:17px;font-weight:700}
.feature-guide p{font-size:14.5px;color:var(--muted);margin:0}

/* ============ Story ============ */
.story{padding:88px 0;background:var(--bg-2)}
.story-inner{max-width:780px;margin-inline:auto;text-align:center}
.story-head .h2{margin-bottom:6px}
.story-body p{color:var(--ink-2);font-size:16.5px;margin:16px 0}
.story-body .text-link{margin-top:8px}

/* ============ Proof ============ */
.proof-band{background:var(--grad-dark);color:#fff;padding:58px 0}
.proof-inner{display:grid;grid-template-columns:.9fr 1.6fr;gap:36px;align-items:center}
.proof-title{margin:0;font-size:19px;font-weight:700;color:#fff;line-height:1.5}
.proof-title span{display:block;font-size:13px;font-weight:500;color:var(--w-72);margin-top:6px}
.proof-list{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.proof-list li{border-right:1px solid rgba(255,255,255,.12);padding-right:16px}
.proof-list li:last-child{border-right:0;padding-right:0}
.proof-list b{display:block;font-size:22px;color:var(--accent);line-height:1.25}
.proof-list span{display:block;font-size:12.5px;color:var(--w-72);margin-top:4px}

/* ============ Download CTA ============ */
.download-cta{position:relative;padding:88px 0;background:linear-gradient(180deg,var(--bg) 0%,var(--bg-3) 100%);text-align:center;overflow:hidden}
.download-cta::before{content:"";position:absolute;inset:auto -8% -160px auto;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(86,214,158,.28),transparent 68%)}
.download-inner{position:relative;max-width:720px;margin-inline:auto}
.download-cta h2{font-size:clamp(24px,3vw,34px);margin-bottom:12px}
.download-cta p{color:var(--muted);margin-bottom:28px}
.download-note{font-size:12.5px;color:var(--muted);margin:18px 0 0}

/* ============ Footer ============ */
.footer{background:var(--dark);color:var(--w-72);padding:56px 0 24px;font-size:14px}
.footer-inner{display:grid;grid-template-columns:1.8fr 1fr 1fr;gap:32px}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;color:#fff;margin-bottom:12px}
.footer-brand img{width:34px;height:34px;border-radius:9px}
.footer p{font-size:13.5px;color:var(--w-56);margin:0;max-width:360px}
.footer h4{font-size:14px;color:#fff;margin-bottom:12px}
.footer nav{display:flex;flex-direction:column;gap:2px}
.footer nav a{display:inline-block;padding:5px 0;font-size:13.5px;color:var(--w-72)}
.footer nav a:hover{color:var(--brand-l)}
.footer-inner nav[aria-label="页脚导航"]{flex-direction:column}
.footer-bottom{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);font-size:12.5px;color:var(--w-56)}
.footer small{color:var(--w-56);font-size:12.5px}

/* ============ 子页通用 ============ */
.page-hero{padding:74px 0 56px;background:radial-gradient(620px 340px at 82% 0%,rgba(255,214,102,.28),transparent 60%),linear-gradient(180deg,#f8fdfb,var(--bg-2))}
.page-hero-inner{max-width:820px}
.crumb{display:flex;flex-wrap:wrap;gap:6px;font-size:13px;color:var(--muted);margin-bottom:16px}
.crumb a:hover{color:var(--brand-d)}
.page-hero h1{font-size:clamp(27px,3.6vw,42px)}
.page-hero .lede{margin:16px 0 0;max-width:700px}

/* 功能页 */
.feature-block{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center;padding:26px 0}
.feature-block + .feature-block{margin-top:44px;padding-top:52px;border-top:1px solid var(--line)}
.feature-block--flip .fb-media{order:-1}
.fb-copy .kicker{margin-bottom:10px}
.fb-copy h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:12px}
.fb-copy p{color:var(--ink-2)}
.fb-list{margin-top:16px;display:grid;gap:9px}
.fb-list li{position:relative;padding-left:26px;font-size:15px;color:var(--ink-2)}
.fb-list li::before{content:"";position:absolute;left:0;top:9px;width:14px;height:8px;border-left:2.4px solid var(--brand);border-bottom:2.4px solid var(--brand);transform:rotate(-45deg);border-radius:1px}
.fb-media{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--sh)}
.fb-media img{width:100%;border-radius:14px}
.fb-window{background:var(--bg-2);border-radius:14px;padding:16px}
.fb-window .win-bar{display:flex;gap:6px;margin-bottom:14px}
.fb-window .win-bar i{width:9px;height:9px;border-radius:50%;background:var(--line);display:block}
.fb-window .win-bar i:first-child{background:#ffd666}
.fb-row{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;background:var(--card);margin-bottom:8px;box-shadow:0 1px 0 var(--line)}
.fb-row:last-child{margin-bottom:0}
.fb-row .ava{width:32px;height:32px;border-radius:9px;background:var(--grad);flex:0 0 auto}
.fb-row .lines{flex:1;min-width:0}
.fb-row .lines i{display:block;height:8px;border-radius:4px;background:var(--bg-3)}
.fb-row .lines i:first-child{width:58%;margin-bottom:6px;background:#d4e5df}
.fb-row .lines i:last-child{width:38%}
.fb-row .pill{font-size:11px;font-weight:700;color:var(--brand-d);background:var(--soda);border-radius:999px;padding:3px 9px}

/* 下载页 */
.dl-hero{padding:70px 0 56px;background:radial-gradient(600px 340px at 80% 0%,rgba(255,214,102,.3),transparent 62%),linear-gradient(180deg,#f8fdfb,var(--bg-2))}
.dl-hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.dl-facts{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.dl-fact{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px;box-shadow:var(--sh)}
.dl-fact b{display:block;font-size:16px;color:var(--brand-d)}
.dl-fact span{font-size:12px;color:var(--muted)}
.dl-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.dl-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:26px 24px;box-shadow:var(--sh);display:flex;flex-direction:column}
.dl-card--hot{border-color:#a9e0d0;box-shadow:var(--sh-lg)}
.dl-card h2{font-size:19px;margin-bottom:4px}
.dl-card .dl-sub{font-size:12.5px;color:var(--muted);margin-bottom:14px}
.dl-card .dl-size{font-size:13px;font-weight:700;color:var(--brand-d);margin-bottom:12px}
.dl-card ul{display:grid;gap:6px;margin-bottom:20px}
.dl-card li{font-size:13.5px;color:var(--ink-2);padding-left:18px;position:relative}
.dl-card li::before{content:"";position:absolute;left:0;top:9px;width:7px;height:7px;border-radius:2px;background:var(--brand-l)}
.dl-card .action{margin-top:auto;width:100%}
.step-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh);position:relative}
.step::before{counter-increment:s;content:counter(s);position:absolute;right:16px;top:10px;font-size:30px;font-weight:800;color:var(--bg-3)}
.step h3{font-size:16px;margin-bottom:6px;position:relative}
.step p{font-size:13.5px;color:var(--muted);margin:0;position:relative}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:11px 14px;text-align:left;font-size:14px}
.spec-table th{background:var(--bg-2);color:var(--brand-d);font-weight:700;white-space:nowrap}
.spec-table td{color:var(--ink-2)}
.table-scroll{overflow-x:auto}

/* 帮助页 FAQ */
.faq-list{display:grid;gap:14px;max-width:880px}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:2px 22px;box-shadow:var(--sh)}
.faq-item summary{list-style:none;cursor:pointer;font-weight:700;font-size:16px;padding:16px 30px 16px 0;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:0;top:13px;font-size:22px;line-height:1;font-weight:700;color:var(--brand)}
.faq-item[open] summary::after{content:"\2212"}
.faq-item p,.faq-item ol{font-size:14.5px;color:var(--muted);margin:0 0 16px}
.faq-item ol{list-style:decimal;padding-left:20px}
.help-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:46px}
.help-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh)}
.help-card h3{font-size:16px;margin-bottom:6px}
.help-card p{font-size:14px;color:var(--muted);margin:0}

/* 404 */
.err{min-height:66vh;display:grid;place-items:center;padding:120px 0 70px;text-align:center;background:linear-gradient(180deg,var(--bg-2),var(--bg))}
.err-code{font-size:clamp(64px,12vw,116px);font-weight:800;line-height:1;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.err h1{font-size:clamp(21px,2.8vw,28px);margin:12px 0 10px}
.err p{color:var(--muted);margin-bottom:24px}
.err-acts{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* 滚动进场 */
.js .reveal{opacity:0;transform:translateY(20px)}
.js .reveal.is-in{opacity:1;transform:none;transition:opacity .6s var(--ease),transform .6s var(--ease)}

/* ============ 响应式 ============ */
@media (max-width:1100px){
  .feature-guide{grid-template-columns:repeat(2,1fr)}
  .proof-inner{grid-template-columns:1fr;gap:24px;text-align:left}
}
@media (max-width:992px){
  .nav-menu{display:block;margin-left:auto}
  .main-nav{position:absolute;top:70px;left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;background:var(--card);border-bottom:1px solid var(--line);box-shadow:var(--sh-lg);padding:12px 16px 18px;display:none;margin:0}
  .header.is-open .main-nav{display:flex}
  .main-nav a{padding:12px 10px;min-height:48px}
  .nav-download{order:2}
  .nav-shell{flex-wrap:nowrap;position:relative}
  .hero-inner,.dl-hero-inner{grid-template-columns:1fr;gap:34px}
  .hero-photo{order:2}
  .side-caption{display:none}
  .feature-block,.feature-block--flip{grid-template-columns:1fr;gap:28px}
  .feature-block--flip .fb-media{order:0}
  .dl-cards{grid-template-columns:repeat(2,1fr)}
  .step-grid{grid-template-columns:repeat(2,1fr)}
  .help-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:repeat(2,1fr)}
  .proof-list{grid-template-columns:repeat(2,1fr);gap:14px}
  .proof-list li:nth-child(2){border-right:0}
  .proof-list li{padding-right:0}
}
@media (max-width:768px){
  .sec,.feature-main,.story{padding:62px 0}
  .hero{padding:56px 0 64px}
  .nav-download{padding:8px 14px;font-size:13.5px;min-height:38px}
  .hero h1{font-size:clamp(27px,7vw,36px)}
  .hero-lede{font-size:15.5px}
  .feature-guide,.dl-cards,.step-grid,.help-grid,.footer-inner{grid-template-columns:1fr}
  .download-actions .action{width:100%}
  .download-cta{padding:64px 0}
  .page-hero,.dl-hero{padding:56px 0 40px}
  .footer-inner{gap:24px}
  .nav-shell{min-height:64px}
  .main-nav{top:64px}
}
@media (max-width:420px){
  .brand{font-size:16px}
  .brand img{width:32px;height:32px}
  .nav-download{padding:8px 12px;font-size:13px}
  .dl-fact{flex:1 1 calc(50% - 12px);padding:10px 12px}
  .faq-item{padding:2px 16px}
}

/* ============ 最新资讯 ============ */
.news{padding:92px 0;background:var(--bg-2)}
.news-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:38px}
.news-head .section-intro{margin:0;text-align:left}
.news-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.news-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh);display:flex;flex-direction:column;transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:#bfe4d8}
.news-tag{align-self:flex-start;font-size:11.5px;font-weight:700;color:var(--brand-d);background:var(--soda);border-radius:999px;padding:3px 10px;margin-bottom:12px}
.news-card h3{font-size:16.5px;line-height:1.45;margin-bottom:8px}
.news-card h3 a{transition:color .2s}
.news-card:hover h3 a{color:var(--brand-d)}
.news-card p{font-size:13.5px;color:var(--muted);margin:0 0 14px}
.news-meta{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:12px;color:var(--muted);border-top:1px dashed var(--line);padding-top:10px}
.news-meta .arrow{color:var(--brand);font-weight:700}
.news-more{text-align:center;margin-top:34px}
.news-list{display:grid;gap:16px;max-width:900px;margin-inline:auto}

/* ============ 文章页 ============ */
.post{padding:60px 0 76px;background:linear-gradient(180deg,var(--bg-2) 0,var(--bg) 320px)}
.post-inner{max-width:840px;margin-inline:auto}
.post-head{margin:6px 0 26px}
.post-title{font-size:clamp(24px,3.2vw,36px);line-height:1.35}
.post-meta{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;color:var(--muted);margin:14px 0 0}
.post-body{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:34px 36px;box-shadow:var(--sh)}
.post-body p{font-size:16.5px;line-height:1.9;color:var(--ink-2)}
.post-body h2{font-size:21px;margin:30px 0 12px;padding-left:12px;border-left:4px solid var(--brand-l);scroll-margin-top:96px}
.post-body h3{font-size:17px;margin:22px 0 8px;color:var(--brand-d);scroll-margin-top:96px}
.post-body ul,.post-body ol{margin:0 0 18px;display:grid;gap:6px}
.post-body ul li{position:relative;padding-left:20px;font-size:15.5px;color:var(--ink-2);line-height:1.8}
.post-body ul li::before{content:"";position:absolute;left:2px;top:11px;width:7px;height:7px;border-radius:2px;background:var(--brand-l)}
.post-body ol{list-style:decimal;padding-left:22px}
.post-body ol li{font-size:15.5px;color:var(--ink-2);line-height:1.85;padding-left:2px}
.post-lede{font-size:17px!important;color:var(--ink)!important;background:var(--bg-2);border-left:4px solid var(--brand);border-radius:0 14px 14px 0;padding:16px 20px;margin-bottom:6px!important}
.post-tip{background:var(--accent-soft);border-radius:12px;padding:14px 18px;font-size:14.5px;color:var(--brand-d);font-weight:600;margin:0 0 18px}
.post-tip span{display:block;font-weight:400;color:var(--muted);font-size:13px;margin-top:4px}
.post-body a{color:var(--brand-d);border-bottom:1px solid rgba(10,156,134,.4)}
.post-body a:hover{color:var(--brand)}
.post-foot{display:flex;flex-wrap:wrap;align-items:center;gap:14px;justify-content:space-between;margin-top:26px;padding-top:22px;border-top:1px dashed var(--line)}
.post-foot p{margin:0;font-size:14px;color:var(--muted)}
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:30px}
.post-nav a{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 18px;font-size:14.5px;font-weight:600;color:var(--ink-2);box-shadow:var(--sh);transition:border-color .2s,color .2s}
.post-nav a:hover{border-color:#bfe4d8;color:var(--brand-d)}
.post-nav span{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-bottom:4px}

@media (max-width:1100px){
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .news-head{flex-direction:column;align-items:flex-start;gap:14px}
}
@media (max-width:768px){
  .news{padding:62px 0}
  .news-grid{grid-template-columns:1fr}
  .post{padding:44px 0 60px}
  .post-body{padding:24px 20px}
  .post-nav{grid-template-columns:1fr}
  .post-foot{flex-direction:column;align-items:flex-start}
}