:root{
    --primary:#4A9BD4;
    --primary-2:#6DB7E6;
    --sky:#8CCCF0;
    --sky-light:#CBE9F8;
    --sky-soft:#EDF8FD;
    --cream:#FFF9EE;
    --cream-2:#FFF4DF;
    --cream-3:#FDFBF6;
    --navy:#17344A;
    --navy-2:#244A64;
    --navy-soft:#4F6D80;
    --accent:#EF8E68;
    --accent-2:#F2B36F;
    --accent-soft:#FFF0E8;
    --bg:#FFFDF8;
    --bg-blue:#F3FAFE;
    --bg-cream:#FFF9EE;
    --surface:#FFFFFF;
    --surface-blue:#F8FCFF;
    --surface-cream:#FFFDF8;
    --text:#203542;
    --text-2:#5E7481;
    --text-3:#8A9AA3;
    --line:rgba(74,155,212,.12);
    --line-strong:rgba(74,155,212,.24);
    --line-warm:rgba(239,142,104,.14);
    --shadow:0 8px 28px rgba(31,88,124,.08);
    --shadow-hover:0 16px 42px rgba(31,88,124,.14);
    --radius:12px;
    --radius-card:18px;
    --radius-large:26px;
    --radius-pill:999px;
    --wrap:1320px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.65}
body.search-open{overflow:hidden}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input{font:inherit}
button{cursor:pointer}
.wrap{width:min(var(--wrap),calc(100% - 40px));margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;left:12px;top:12px;z-index:1000;transform:translateY(-160%);background:var(--navy);color:white;padding:10px 14px;border-radius:10px}
.skip-link:focus{transform:none}
.top-note{background:var(--navy);color:#dcebf4;font-size:13px}
.top-note-inner{min-height:34px;display:flex;gap:18px;align-items:center;justify-content:space-between}
.top-note a{color:white}
.site-header{position:sticky;top:0;z-index:80;background:rgba(255,249,238,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:30px;min-height:76px}
.brand{display:flex;align-items:center;gap:10px;min-width:160px}
.brand img{width:52px;height:36px;object-fit:cover;border-radius:10px}
.brand span{display:flex;flex-direction:column;line-height:1.15}.brand strong{font-size:20px}.brand small{color:var(--text-2);font-size:11px;margin-top:4px}
.main-nav{display:flex;align-items:center;gap:6px;flex:1}
.main-nav a{padding:10px 13px;border-radius:999px;color:var(--navy-2);font-weight:650;font-size:14px}.main-nav a:hover,.main-nav a.is-active{background:var(--sky-soft);color:var(--primary)}
.header-actions{display:flex;align-items:center;gap:8px}.icon-btn,.menu-btn,.header-link,.app-pill{border:1px solid var(--line-strong);background:var(--surface-cream);padding:9px 12px;border-radius:999px;color:var(--navy);font-size:13px}.app-pill{background:var(--primary);border-color:var(--primary);color:white}.icon-btn:hover,.menu-btn:hover,.header-link:hover{background:var(--surface)}
.mega-menu{background:rgba(255,255,255,.96);border-top:1px solid var(--line);box-shadow:var(--shadow)}.mega-menu[hidden]{display:none!important}.mega-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;padding:18px 0 22px}.mega-grid a{padding:14px;border-radius:14px;background:var(--bg-blue);border:1px solid var(--line)}.mega-grid span,.mega-grid small{display:block}.mega-grid small{color:var(--text-2);margin-top:4px}
main{min-height:60vh}.section{padding:74px 0}.section.compact{padding:46px 0}.section-blue{background:var(--bg-blue)}.section-cream{background:var(--bg-cream)}.section-dark{background:var(--navy);color:white}.section-dark p,.section-dark .meta,.section-dark .eyeline{color:#c8dce7}.section-warm{background:linear-gradient(135deg,var(--cream) 0%,var(--accent-soft) 100%)}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:28px;margin-bottom:28px}.section-head h2{font-size:clamp(28px,4vw,44px);line-height:1.12;margin:6px 0 0;letter-spacing:-.02em}.section-head p{max-width:720px;color:var(--text-2);margin:12px 0 0}.section-dark .section-head p{color:#c8dce7}.section-eyebrow{display:inline-flex;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--primary);font-weight:800}.text-link{color:var(--primary);font-weight:700;white-space:nowrap}
.hero{padding:74px 0 58px;background:radial-gradient(circle at 88% 8%,rgba(140,204,240,.28),transparent 34%),linear-gradient(135deg,var(--cream) 0%,#f9fcff 64%,var(--sky-soft) 100%);overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.16fr .84fr;gap:48px;align-items:center}.hero h1{font-size:clamp(48px,6vw,82px);line-height:.98;letter-spacing:-.05em;margin:18px 0 24px;color:var(--navy)}.hero-copy{font-size:18px;color:var(--text-2);max-width:720px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line-strong);padding:12px 18px;border-radius:999px;background:var(--surface);color:var(--navy);font-weight:750}.btn.primary{background:var(--primary);color:white;border-color:var(--primary)}.btn.live{background:var(--accent);color:white;border-color:var(--accent)}.btn.ghost{background:transparent}.hero-search{display:flex;gap:8px;max-width:620px;padding:8px;border:1px solid var(--line-strong);border-radius:18px;background:rgba(255,255,255,.78)}.hero-search input{flex:1;border:0;outline:0;background:transparent;padding:9px 12px;min-width:120px}.hero-visual{position:relative}.hero-visual>img{border-radius:32px;aspect-ratio:4/3;object-fit:cover;box-shadow:var(--shadow-hover)}.float-panel{position:absolute;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.7);box-shadow:var(--shadow);border-radius:18px;padding:16px;width:min(260px,70%)}.float-panel.one{right:-18px;top:12%}.float-panel.two{left:-28px;bottom:9%}.float-panel strong,.float-panel span{display:block}.float-panel small{color:var(--text-2)}
.chip-row{display:flex;gap:10px;overflow-x:auto;padding:3px 0 10px;scrollbar-width:none}.chip-row::-webkit-scrollbar{display:none}.chip{flex:0 0 auto;border:1px solid var(--line-strong);background:var(--surface);padding:9px 13px;border-radius:999px;font-size:14px}.chip:hover{border-color:var(--primary);color:var(--primary)}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}.split-7-5{display:grid;grid-template-columns:1.4fr 1fr;gap:28px}.split-5-7{display:grid;grid-template-columns:1fr 1.4fr;gap:28px}.magazine-grid{display:grid;grid-template-columns:1.4fr .7fr .7fr;grid-template-rows:1fr 1fr;gap:18px}.magazine-grid>*:first-child{grid-row:1/3}.bento{display:grid;grid-template-columns:1.2fr .8fr .8fr;grid-auto-rows:220px;gap:18px}.bento>*:first-child{grid-row:span 2}.bento>*:nth-child(4){grid-column:span 2}.rail{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(280px,360px);gap:18px;overflow-x:auto;padding-bottom:12px;scroll-snap-type:x proximity}.rail>*{scroll-snap-align:start}.portrait-rail{display:grid;grid-auto-flow:column;grid-auto-columns:220px;gap:16px;overflow-x:auto;padding-bottom:12px}.discussion-columns{columns:2 360px;column-gap:24px}.discussion-columns>*{break-inside:avoid;margin-bottom:20px}.rank-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);gap:28px}.story-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:36px;align-items:center}.reverse{direction:rtl}.reverse>*{direction:ltr}.timeline{display:grid;gap:0;border-left:1px solid var(--line-strong);margin-left:10px}.timeline-item{padding:0 0 26px 24px;position:relative}.timeline-item:before{content:"";position:absolute;left:-6px;top:9px;width:11px;height:11px;border-radius:50%;background:var(--primary)}
.video-card,.live-card,.topic-card,.anchor-card,.info-card,.tutorial-card,.feature-card{border:1px solid var(--line);border-radius:var(--radius-card);background:var(--surface);overflow:hidden}.video-card{transition:transform .2s ease,box-shadow .2s ease}.video-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}.video-card .media-frame,.live-card .media-frame{display:block;position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--sky-soft)}.media-frame img{width:100%;height:100%;object-fit:cover;transition:transform .2s ease}.video-card:hover .media-frame img{transform:scale(1.02)}.play-icon{position:absolute;left:16px;bottom:14px;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.9);color:var(--navy);transition:transform .2s ease}.video-card:hover .play-icon{transform:scale(1.05)}.duration{position:absolute;right:12px;bottom:12px;background:rgba(23,52,74,.84);color:white;font-size:12px;padding:5px 7px;border-radius:8px}.card-body{padding:18px}.card-body h3,.topic-card h3{font-size:18px;line-height:1.4;margin:8px 0}.card-body p,.topic-card p,.info-card p,.tutorial-card p,.feature-card p{color:var(--text-2);margin:0}.eyeline{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--primary);font-size:12px}.meta{margin-top:14px;color:var(--text-2);font-size:13px}.live-card{background:linear-gradient(180deg,var(--surface) 0%,var(--accent-soft) 180%)}.live-badge{position:absolute;left:12px;top:12px;background:var(--accent);color:white;border-radius:999px;padding:6px 9px;font-size:11px;font-weight:850;letter-spacing:.08em}.anchor-card{display:grid;grid-template-columns:110px 1fr;gap:16px;padding:16px}.anchor-card>img{width:110px;height:110px;object-fit:cover;border-radius:50%;background:var(--sky-soft)}.anchor-card h3{margin:4px 0}.anchor-card p{margin:6px 0;color:var(--text-2)}.anchor-card small{color:var(--text-3)}.topic-card{padding:20px}.topic-head{display:flex;align-items:center;gap:10px}.topic-head>div{display:flex;flex-direction:column}.topic-head small{color:var(--text-3)}.avatar-dot{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--sky-soft);color:var(--primary);font-weight:800}.topic-related{margin-top:14px;border-top:1px solid var(--line);padding-top:12px;color:var(--text-2);font-size:13px}.info-card,.tutorial-card,.feature-card{padding:22px}.info-card.soft{background:var(--surface-blue)}.info-card.warm{background:var(--surface-cream)}.info-card.no-border{border:0;background:transparent;padding:0}.number-card{display:grid;grid-template-columns:64px 1fr;gap:16px;align-items:start}.number-card strong{font-size:42px;color:var(--primary);line-height:1}.tutorial-card .step{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--cream-2);color:var(--navy);font-weight:800}.trend-list{display:grid;gap:12px}.trend-item{display:grid;grid-template-columns:40px 1fr auto;gap:14px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}.trend-index{font-weight:900;color:var(--primary)}.trend-change{font-size:12px;color:var(--accent)}.ranking-list{list-style:none;padding:0;margin:0}.ranking-list li{display:grid;grid-template-columns:44px 1fr auto;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}.ranking-list .rank{font-size:22px;font-weight:900;color:var(--primary)}.ranking-list small{display:block;color:var(--text-2)}
.feature-media{position:relative;border-radius:var(--radius-large);overflow:hidden;min-height:360px;background:var(--sky-soft)}.feature-media img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}.feature-overlay{position:absolute;inset:auto 0 0;padding:34px;color:white;background:linear-gradient(transparent,rgba(15,42,61,.92))}.feature-overlay p{max-width:720px}.feature-copy{padding:18px 0}.feature-copy h3{font-size:34px;line-height:1.15;margin:8px 0 14px}.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat{padding:18px;border-radius:18px;background:var(--surface-blue);border:1px solid var(--line)}.stat strong{display:block;font-size:28px;color:var(--primary)}.stat span{color:var(--text-2);font-size:13px}
.search-modal{display:none;position:fixed;inset:0;z-index:200;background:rgba(15,42,61,.42);padding:18px;align-items:flex-start;justify-content:center;overflow:auto}.search-modal.is-open{display:flex}.search-modal[hidden]{display:none !important}.search-dialog{width:min(820px,100%);margin-top:min(12vh,120px);background:var(--surface);border-radius:28px;padding:28px;border:1px solid rgba(255,255,255,.7);box-shadow:0 30px 80px rgba(15,42,61,.24)}.search-dialog-head{display:flex;justify-content:space-between;gap:24px;align-items:start}.search-dialog h2{margin:5px 0 0;font-size:30px}.search-close{border:1px solid var(--line-strong);background:var(--cream);width:42px;height:42px;border-radius:50%;font-size:26px}.search-form{display:flex;gap:10px;margin:24px 0 16px}.search-form input{flex:1;min-width:0;border:1px solid var(--line-strong);border-radius:16px;padding:12px 14px;outline:none}.search-form input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(74,155,212,.12)}.search-suggestions{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.search-suggestions span{color:var(--text-2);font-size:13px}.search-suggestions a{padding:7px 10px;border-radius:999px;background:var(--sky-soft);font-size:13px}.search-fallback{color:var(--text-3);font-size:13px;margin-bottom:0}
.faq-list{display:grid;gap:10px}.faq-item{border:1px solid var(--line);border-radius:16px;background:var(--surface);overflow:hidden}.faq-item summary{cursor:pointer;padding:18px 20px;font-weight:800;list-style:none}.faq-item summary::-webkit-details-marker{display:none}.faq-item div{padding:0 20px 18px}.faq-item p{margin:0;color:var(--text-2)}
.device-showcase{display:grid;grid-template-columns:.7fr 1.3fr;gap:46px;align-items:center}.device-showcase .phone{max-height:560px;margin:auto;filter:drop-shadow(0 24px 36px rgba(31,88,124,.15))}.steps{counter-reset:step;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.step-card{counter-increment:step;border-top:3px solid var(--primary);padding:20px;background:var(--surface);border-radius:0 0 18px 18px}.step-card:before{content:"0" counter(step);display:block;color:var(--primary);font-weight:900;margin-bottom:12px}.callout{padding:24px 28px;border-radius:20px;background:var(--cream-2);border-left:4px solid var(--accent)}
.site-footer{background:var(--navy);color:white;padding:64px 0 24px;margin-top:0}.footer-top{display:grid;grid-template-columns:1.1fr 1.9fr;gap:48px}.footer-brand h2{font-size:38px;line-height:1.1;margin:10px 0}.footer-brand p{color:#c8dce7}.footer-links{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.footer-links div{display:grid;align-content:start;gap:8px}.footer-links strong{margin-bottom:6px}.footer-links a{color:#c8dce7;font-size:14px}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:42px;padding-top:20px;display:flex;justify-content:space-between;gap:20px;color:#a8c1d0;font-size:13px}.mobile-bottom-nav{display:none}.back-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:50%;border:1px solid var(--line-strong);background:var(--surface);color:var(--navy);box-shadow:var(--shadow);opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s}.back-top.is-visible{opacity:1;pointer-events:auto;transform:none}
.page-hero{padding:68px 0 46px;background:linear-gradient(135deg,var(--cream),var(--sky-soft))}.page-hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center}.page-hero h1{font-size:clamp(44px,5vw,70px);line-height:1.02;letter-spacing:-.04em;margin:12px 0 18px}.page-hero p{font-size:17px;color:var(--text-2);max-width:760px}.page-hero img{border-radius:28px;aspect-ratio:16/10;object-fit:cover}.page-intro{max-width:820px;color:var(--text-2);font-size:17px}.notice-bar{padding:16px;border-radius:16px;background:var(--sky-soft);border:1px solid var(--line);display:flex;gap:14px;align-items:center}.notice-bar strong{color:var(--primary)}.tag-cloud{display:flex;gap:10px;flex-wrap:wrap}.tag-cloud a{padding:10px 14px;border-radius:999px;background:var(--surface);border:1px dashed var(--line-strong)}
@media(max-width:1080px){.main-nav{display:none}.header-inner{gap:14px}.header-actions{margin-left:auto}.mega-grid{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(2,1fr)}.grid-5{grid-template-columns:repeat(3,1fr)}.hero-grid,.page-hero-grid,.footer-top,.device-showcase{grid-template-columns:1fr}.hero-visual{max-width:760px}.rank-layout,.split-7-5,.split-5-7,.story-layout{grid-template-columns:1fr}.reverse{direction:ltr}.bento{grid-template-columns:1fr 1fr}.magazine-grid{grid-template-columns:1.2fr .8fr}.magazine-grid>*:first-child{grid-row:auto;grid-column:1/3}.stats-row{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){body{padding-bottom:64px}.wrap{width:min(100% - 28px,var(--wrap))}.top-note-inner span:nth-child(2){display:none}.site-header{top:0}.brand{min-width:0}.brand img{width:44px}.brand small{display:none}.header-link,.menu-btn{display:none}.header-actions{gap:5px}.icon-btn,.app-pill{padding:8px 10px}.hero{padding:46px 0}.hero-grid{gap:30px}.hero h1{font-size:48px}.float-panel{position:static;width:100%;margin-top:10px}.hero-actions{display:grid;grid-template-columns:1fr 1fr}.hero-search{display:grid}.section{padding:54px 0}.section-head{display:block}.section-head .text-link{display:inline-block;margin-top:14px}.grid-2,.grid-3,.grid-4,.grid-5{grid-template-columns:1fr}.rail{grid-auto-columns:82vw}.portrait-rail{grid-auto-columns:75vw}.magazine-grid,.bento{display:grid;grid-template-columns:1fr;grid-auto-rows:auto}.magazine-grid>*:first-child,.bento>*:first-child,.bento>*:nth-child(4){grid-column:auto;grid-row:auto}.discussion-columns{columns:1}.steps{grid-template-columns:1fr}.anchor-card{grid-template-columns:86px 1fr}.anchor-card>img{width:86px;height:86px}.search-dialog{padding:20px;border-radius:22px}.search-form{display:grid}.footer-links{grid-template-columns:1fr 1fr}.footer-bottom{display:grid}.mobile-bottom-nav{display:grid;position:fixed;left:0;right:0;bottom:0;z-index:90;grid-template-columns:repeat(5,1fr);background:rgba(255,253,248,.94);backdrop-filter:blur(14px);border-top:1px solid var(--line);padding:8px 6px calc(8px + env(safe-area-inset-bottom))}.mobile-bottom-nav a{text-align:center;font-size:12px;padding:6px;border-radius:10px;color:var(--text-2)}.mobile-bottom-nav a.is-active{background:var(--sky-soft);color:var(--primary);font-weight:800}.back-top{bottom:80px}.feature-media{min-height:300px}.feature-copy h3{font-size:28px}.page-hero{padding:46px 0 34px}.page-hero h1{font-size:46px}.stats-row{grid-template-columns:1fr 1fr}}