:root{--blue:#1a7fd4;--blue-deep:#0d5fa5;--blue-soft:#eaf4fd;--ink:#111418;--ink-2:#3a4048;--muted:#7b838d;--line:#e6eaef;--bg:#ffffff;--grid:rgba(26,127,212,.055);--shadow:0 2px 10px rgba(17,20,24,.055);--r:12px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:15px;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--blue);color:#fff;font-weight:700;font-size:15px;padding:13px 26px;border-radius:10px;border:none;cursor:pointer;transition:background .2s,transform .2s;line-height:1.2}
.btn:hover{background:var(--blue-deep);transform:translateY(-1px)}
.btn.ghost{background:#fff;color:var(--blue);border:1.5px solid var(--blue)}
.btn.ghost:hover{background:var(--blue-soft)}
.btn.sm{padding:9px 18px;font-size:13.5px;border-radius:8px}
.section{padding:72px 0;position:relative}
.section.alt{background:#f7fafc}
.eyebrow{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.06em;color:var(--blue);background:var(--blue-soft);padding:4px 12px;border-radius:99px;margin-bottom:14px}
h2{font-size:30px;font-weight:800;letter-spacing:-.01em;line-height:1.35;color:var(--ink)}
h3{font-size:17.5px;font-weight:700;line-height:1.45}
.lead{color:var(--ink-2);font-size:15.5px;margin-top:10px;max-width:640px}
.sec-head{margin-bottom:38px}

/* header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:66px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17.5px;letter-spacing:-.01em;flex-shrink:0}
.brand img{height:34px;width:auto;border-radius:8px}
.nav-links{display:flex;align-items:center;gap:2px;overflow-x:auto;scrollbar-width:none}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{font-size:13.5px;color:var(--ink-2);padding:8px 10px;border-radius:7px;white-space:nowrap;font-weight:500;transition:color .2s,background .2s}
.nav-links a:hover{color:var(--blue);background:var(--blue-soft)}
.nav-cta{flex-shrink:0}

/* hero */
.hero{padding:56px 0 64px;background:linear-gradient(180deg,#fff 0%,#fbfdff 100%);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}
.hero h1{font-size:40px;font-weight:800;letter-spacing:-.02em;line-height:1.3}
.hero h1 em{font-style:normal;color:var(--blue)}
.hero .lead{font-size:16px;margin-top:16px}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.hero-tags span{font-size:12.5px;font-weight:600;color:var(--blue-deep);background:var(--blue-soft);border:1px solid rgba(26,127,212,.16);padding:5px 11px;border-radius:99px}
.hero-dl{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px;align-items:center}
.hero-dl .btn{min-width:150px}
.hero-note{font-size:12.5px;color:var(--muted);margin-top:12px}
.hero-visual{position:relative}
.hero-cover{display:grid;grid-template-columns:1.15fr .85fr;grid-template-rows:auto auto;gap:14px}
.hero-cover .cv{border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);background:#eef4fa;border:1px solid var(--line)}
.hero-cover .cv img{width:100%;height:100%;object-fit:cover}
.hero-cover .cv.big{grid-row:span 2;aspect-ratio:3/4}
.hero-cover .cv.small{aspect-ratio:3/4}
.hero-float{position:absolute;left:-14px;bottom:-14px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:10px 14px;font-size:12.5px;font-weight:700;color:var(--blue-deep);display:flex;align-items:center;gap:8px}
.hero-float i{width:7px;height:7px;border-radius:50%;background:#22b573;display:inline-block}

/* feature cards */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px 20px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 22px rgba(17,20,24,.08)}
.card .ico{width:42px;height:42px;border-radius:10px;background:var(--blue-soft);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:800;margin-bottom:14px}
.card h3{margin-bottom:7px}
.card p{font-size:13.5px;color:var(--ink-2);line-height:1.7}

/* zigzag */
.zig{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:52px}
.zig:last-child{margin-bottom:0}
.zig.flip .zig-txt{order:2}
.zig-txt h3{font-size:22px;margin-bottom:10px}
.zig-txt p{color:var(--ink-2);font-size:14.5px}
.zig-list{list-style:none;margin-top:16px;display:grid;gap:9px}
.zig-list li{font-size:14px;color:var(--ink-2);display:flex;gap:9px;align-items:flex-start}
.zig-list li::before{content:"";width:6px;height:6px;border-radius:2px;background:var(--blue);margin-top:9px;flex-shrink:0}
.zig-visual{border-radius:var(--r);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);background:#f2f7fb;aspect-ratio:4/3}
.zig-visual img{width:100%;height:100%;object-fit:cover}

/* waterfall */
.falls{column-count:4;column-gap:18px}
.fall{break-inside:avoid;margin-bottom:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow)}
.fall img{width:100%;height:auto}
.fall .fb{padding:12px 14px}
.fall .fb strong{display:block;font-size:13.5px;margin-bottom:3px}
.fall .fb span{font-size:12px;color:var(--muted)}

/* rank list */
.rank{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.rank-item{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 16px;box-shadow:var(--shadow);transition:border-color .2s}
.rank-item:hover{border-color:var(--blue)}
.rank-no{width:30px;height:30px;border-radius:8px;background:var(--blue-soft);color:var(--blue-deep);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;flex-shrink:0}
.rank-item:nth-child(1) .rank-no,.rank-item:nth-child(2) .rank-no,.rank-item:nth-child(3) .rank-no{background:var(--blue);color:#fff}
.rank-meta{flex:1;min-width:0}
.rank-meta strong{display:block;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rank-meta span{font-size:12px;color:var(--muted)}
.rank-tag{font-size:11.5px;color:var(--blue-deep);background:var(--blue-soft);padding:3px 9px;border-radius:99px;font-weight:600;flex-shrink:0}

/* screenshots */
.shots{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.shot{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);text-align:center}
.shot .ph{aspect-ratio:9/16;background:#edf4fa;overflow:hidden;display:flex;align-items:center;justify-content:center}
.shot .ph img{width:100%;height:100%;object-fit:cover;object-position:top}
.shot .cap{padding:12px 10px;font-size:13px;font-weight:600;border-top:1px solid var(--line)}

/* feedback */
.feed{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.fb-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px}
.fb-top{display:flex;align-items:center;gap:10px}
.fb-top img{width:34px;height:34px;border-radius:50%;border:1px solid var(--line);object-fit:cover}
.fb-top b{font-size:13.5px;display:block}
.fb-top em{font-style:normal;font-size:11.5px;color:var(--muted)}
.fb-card p{font-size:13.5px;color:var(--ink-2)}
.stars{color:#f5a623;font-size:12px;letter-spacing:2px}

/* privacy */
.priv{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.priv-item{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--shadow)}
.priv-item h4{font-size:15px;margin-bottom:8px;color:var(--ink)}
.priv-item p{font-size:13.5px;color:var(--ink-2)}

/* faq */
.faq{max-width:820px;margin:0 auto;display:grid;gap:12px}
.qa{background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);overflow:hidden}
.qa summary{list-style:none;cursor:pointer;padding:16px 20px;font-weight:700;font-size:14.5px;display:flex;justify-content:space-between;gap:12px;align-items:center}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";color:var(--blue);font-weight:800;font-size:18px;line-height:1;flex-shrink:0}
.qa[open] summary::after{content:"–"}
.qa p{padding:0 20px 18px;font-size:13.5px;color:var(--ink-2)}

/* download */
.dl-sec{background:var(--ink);color:#fff;padding:72px 0}
.dl-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.dl-sec .eyebrow{background:rgba(255,255,255,.12);color:#9fd0f7}
.dl-sec h2{color:#fff}
.dl-sec .lead{color:#b8c1cb}
.steps{list-style:none;margin-top:24px;display:grid;gap:14px}
.steps li{display:flex;gap:14px;align-items:flex-start;background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.1);border-radius:10px;padding:14px 16px}
.steps .sn{width:26px;height:26px;border-radius:7px;background:var(--blue);color:#fff;font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.steps b{display:block;font-size:14px;margin-bottom:2px}
.steps span{font-size:13px;color:#b8c1cb}
.dl-btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.dl-sec .btn{background:var(--blue)}
.dl-sec .btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.dl-sec .btn.ghost:hover{background:rgba(255,255,255,.1)}
.dl-panel{background:#fff;border-radius:16px;padding:26px;text-align:center;color:var(--ink);box-shadow:0 18px 44px rgba(0,0,0,.28)}
.dl-panel h3{font-size:16px;margin-bottom:14px}
.dl-panel img{width:100%;max-width:230px;margin:0 auto;border-radius:10px}
.dl-panel p{font-size:12.5px;color:var(--muted);margin-top:14px}

/* footer */
.site-foot{background:#f7fafc;border-top:1px solid var(--line);padding:48px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:36px;margin-bottom:34px}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16.5px;margin-bottom:12px}
.foot-brand img{height:30px;width:auto;border-radius:7px}
.foot-grid p{font-size:13.5px;color:var(--ink-2);max-width:360px}
.foot-col h4{font-size:13.5px;margin-bottom:12px}
.foot-col a{display:block;font-size:13px;color:var(--muted);padding:4px 0;transition:color .2s}
.foot-col a:hover{color:var(--blue)}
.foot-bot{border-top:1px solid var(--line);padding-top:20px;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center;font-size:12.5px;color:var(--muted)}
.foot-bot time{color:#9aa3ad}

/* modal 拦截 */
.mask{position:fixed;inset:0;background:rgba(17,20,24,.55);display:none;align-items:center;justify-content:center;z-index:200;padding:20px}
.mask.on{display:flex}
.modal{background:#fff;border-radius:16px;max-width:400px;width:100%;padding:26px;text-align:center;box-shadow:0 24px 60px rgba(0,0,0,.3)}
.modal h3{font-size:16px;line-height:1.6;margin-bottom:14px}
.modal .link-box{background:#f2f6fa;border:1px dashed #b9cde0;border-radius:9px;padding:11px;font-size:13px;word-break:break-all;color:var(--blue-deep);margin-bottom:14px;user-select:all}
.modal .modal-btns{display:flex;gap:10px;justify-content:center}
.modal .btn{flex:1}
.modal .close{background:#eef1f5;color:var(--ink-2);border:none;padding:13px 20px;border-radius:10px;font-weight:700;cursor:pointer;font-size:14px;flex:1}

@media (max-width:1024px){
  .cards{grid-template-columns:repeat(2,1fr)}
  .falls{column-count:3}
  .hero h1{font-size:34px}
  .shots{grid-template-columns:repeat(3,1fr)}
  .feed{grid-template-columns:repeat(2,1fr)}
  .priv{grid-template-columns:repeat(2,1fr)}
  .nav-links{display:none}
}
@media (max-width:768px){
  .section{padding:52px 0}
  .wrap{padding:0 16px}
  h2{font-size:24px}
  .hero{padding:36px 0 48px}
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .hero h1{font-size:29px}
  .hero .lead{font-size:15px}
  .hero-dl{width:100%}
  .hero-dl .btn{flex:1;min-width:0;padding:13px 12px;font-size:14px}
  .hero-cover{grid-template-columns:1fr 1fr}
  .hero-cover .cv.big{grid-row:span 1;grid-column:span 2;aspect-ratio:16/10}
  .hero-cover .cv.small{aspect-ratio:3/4}
  .hero-float{display:none}
  .cards,.feed,.priv{grid-template-columns:1fr}
  .falls{column-count:2;column-gap:12px}
  .zig{grid-template-columns:1fr;gap:22px;margin-bottom:38px}
  .zig.flip .zig-txt{order:0}
  .rank{grid-template-columns:1fr}
  .shots{grid-template-columns:repeat(2,1fr);gap:14px}
  .dl-grid{grid-template-columns:1fr;gap:32px}
  .dl-panel{max-width:360px;margin:0 auto;width:100%}
  .foot-grid{grid-template-columns:1fr;gap:26px}
  .foot-bot{flex-direction:column;align-items:flex-start}
  .brand img{height:29px}
  .brand{font-size:16px}
  .nav-in{height:60px}
  .dl-btns .btn{flex:1;min-width:0}
}
@media (max-width:400px){
  .hero-dl .btn,.dl-btns .btn{flex:1 1 100%}
  .shots{grid-template-columns:1fr}
  .falls{column-count:1}
}