:root{--brand:#1f6feb;--brand-2:#7c3aed;--brand-3:#0ea5a4;--brand-4:#f43f5e;--bg:#ffffff;--bg-soft:#f5f7fb;--bg-glass:rgba(255,255,255,.72);--bg-glass-strong:rgba(255,255,255,.86);--text:#1b1f24;--muted:#5b6472;--line:#e3e8ef;--radius:14px;--radius-sm:10px;--radius-lg:22px;--shadow:0 6px 24px rgba(20,30,60,.08);--shadow-lg:0 18px 48px rgba(20,30,60,.14);--grad-hero:linear-gradient(135deg,#eef4ff 0%,#f3ecff 45%,#e8fbfa 100%);--grad-brand:linear-gradient(135deg,#1f6feb 0%,#7c3aed 55%,#0ea5a4 100%);--grad-card:linear-gradient(140deg,rgba(31,111,235,.06),rgba(124,58,237,.06) 60%,rgba(14,165,164,.06));--ease:cubic-bezier(.22,.61,.36,1)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.75;font-size:16px;overflow-x:hidden;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;transition:background .35s var(--ease),color .35s var(--ease)}
img,svg{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none;transition:color .25s var(--ease),opacity .25s var(--ease)}
a:hover{text-decoration:underline}
::selection{background:rgba(31,111,235,.18);color:var(--text)}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 18px}
.site-header{position:sticky;top:0;z-index:50;background:var(--bg-glass-strong);backdrop-filter:blur(16px) saturate(180%);-webkit-backdrop-filter:blur(16px) saturate(180%);border-bottom:1px solid var(--line);transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease)}
.site-header::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:var(--grad-brand);opacity:.35}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--text);letter-spacing:.2px;transition:transform .3s var(--ease)}
.brand:hover{text-decoration:none;transform:translateY(-1px)}
.brand svg{filter:drop-shadow(0 4px 10px rgba(31,111,235,.28));transition:transform .5s var(--ease)}
.brand:hover svg{transform:rotate(-6deg) scale(1.06)}
.nav-links{display:flex;gap:22px;align-items:center;flex-wrap:wrap}
.nav-links a{position:relative;color:var(--muted);font-size:15px;font-weight:500;padding:4px 0;transition:color .25s var(--ease)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;border-radius:2px;background:var(--grad-brand);transition:width .3s var(--ease)}
.nav-links a:hover{color:var(--brand);text-decoration:none}
.nav-links a:hover::after{width:100%}
.nav-tools{display:flex;gap:10px;align-items:center}
.btn{border:1px solid var(--line);background:var(--bg-glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:var(--radius-sm);padding:8px 14px;font-size:14px;cursor:pointer;color:var(--text);font-family:inherit;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease)}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:rgba(31,111,235,.4)}
.btn:active{transform:translateY(0) scale(.98)}
.btn-primary{background:var(--grad-brand);border-color:transparent;color:#fff;box-shadow:0 8px 20px rgba(31,111,235,.28)}
.btn-primary:hover{filter:brightness(1.06);box-shadow:0 12px 28px rgba(31,111,235,.38)}
.menu-toggle{display:none}
.hero{position:relative;background:var(--grad-hero);padding:56px 0 44px;border-bottom:1px solid var(--line);overflow:hidden;transition:background .35s var(--ease),border-color .35s var(--ease)}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;pointer-events:none;animation:floatBlob 14s ease-in-out infinite}
.hero::before{width:340px;height:340px;background:radial-gradient(circle,rgba(31,111,235,.45),transparent 70%);top:-120px;right:-60px}
.hero::after{width:300px;height:300px;background:radial-gradient(circle,rgba(124,58,237,.35),transparent 70%);bottom:-140px;left:-80px;animation-delay:-6s}
@keyframes floatBlob{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(24px,-18px) scale(1.08)}}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center}
.hero h1{font-size:34px;line-height:1.35;margin-bottom:14px;letter-spacing:.2px;font-weight:800}
.hero h1 span{background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.hero p{color:var(--muted);font-size:16.5px;margin-bottom:18px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:26px}
.stat{position:relative;background:var(--bg-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:var(--radius);padding:14px;text-align:center;box-shadow:var(--shadow);overflow:hidden;transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.stat::before{content:"";position:absolute;inset:0;background:var(--grad-card);opacity:0;transition:opacity .3s var(--ease)}
.stat:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.stat:hover::before{opacity:1}
.stat b{position:relative;font-size:22px;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;display:block;font-weight:800}
.stat small{position:relative;color:var(--muted);font-size:13px}
.slider{position:relative;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);background:var(--bg-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:var(--shadow-lg);transition:box-shadow .3s var(--ease),transform .3s var(--ease)}
.slider:hover{transform:translateY(-3px);box-shadow:0 24px 60px rgba(20,30,60,.18)}
.slides{position:relative;min-height:260px}
.slide{position:absolute;inset:0;opacity:0;transform:translateY(10px) scale(.99);transition:opacity .6s var(--ease),transform .6s var(--ease);padding:26px;display:flex;flex-direction:column;justify-content:center;gap:10px;pointer-events:none}
.slide.active{opacity:1;transform:none;position:relative;pointer-events:auto}
.slide h3{font-size:20px;line-height:1.45}
.slide p{color:var(--muted);font-size:14.5px}
.slide-tag{display:inline-block;font-size:12px;color:#fff;background:var(--grad-brand);border-radius:999px;padding:3px 12px;width:fit-content;font-weight:600;letter-spacing:.4px;box-shadow:0 6px 16px rgba(31,111,235,.28)}
.slider-dots{display:flex;gap:8px;justify-content:center;padding:12px}
.dot{width:8px;height:8px;border-radius:50%;background:#cfd8e6;border:0;cursor:pointer;padding:0;transition:width .35s var(--ease),background .35s var(--ease),transform .2s var(--ease)}
.dot:hover{transform:scale(1.25)}
.dot.active{background:var(--brand);width:22px;border-radius:999px}
section{padding:52px 0;border-bottom:1px solid var(--line);transition:border-color .35s var(--ease)}
section h2{position:relative;font-size:26px;margin-bottom:12px;padding-left:16px;font-weight:800;letter-spacing:.2px}
section h2::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:5px;border-radius:999px;background:var(--grad-brand)}
section h3{font-size:19px;margin:22px 0 8px;font-weight:700}
section h4{font-size:16.5px;margin:16px 0 6px;color:#243043;font-weight:700}
.lead{color:var(--muted);max-width:900px;margin-bottom:22px}
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{position:relative;background:var(--bg-glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);overflow:hidden;transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease)}
.card::before{content:"";position:absolute;inset:0;background:var(--grad-card);opacity:0;transition:opacity .35s var(--ease);pointer-events:none}
.card::after{content:"";position:absolute;top:0;left:-40%;width:40%;height:100%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.55),transparent);transform:skewX(-18deg);opacity:0;transition:opacity .3s var(--ease);pointer-events:none}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(31,111,235,.28)}
.card:hover::before{opacity:1}
.card:hover::after{opacity:1;animation:sheen .9s var(--ease)}
@keyframes sheen{0%{left:-40%}100%{left:120%}}
.card>*{position:relative;z-index:1}
.card h3{margin-top:0}
.card p{color:var(--muted);font-size:14.8px}
.pill{display:inline-block;background:var(--bg-soft);border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:3px 10px;font-size:12.5px;margin:2px 6px 2px 0;transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease)}
.pill:hover{background:rgba(31,111,235,.1);color:var(--brand);border-color:rgba(31,111,235,.3)}
.breadcrumb{font-size:13.5px;color:var(--muted);padding:14px 0 0}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb span{margin:0 6px}
.toc{background:var(--bg-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:var(--radius-lg);padding:18px 20px;box-shadow:var(--shadow);transition:box-shadow .3s var(--ease),border-color .3s var(--ease)}
.toc:hover{box-shadow:var(--shadow-lg);border-color:rgba(31,111,235,.25)}
.toc ul{list-style:none;columns:2;column-gap:26px}
.toc li{margin:4px 0;font-size:14.5px;break-inside:avoid}
.toc a{display:inline-block;color:#33415c;transition:color .25s var(--ease),transform .25s var(--ease)}
.toc a:hover{color:var(--brand);transform:translateX(4px);text-decoration:none}
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.article{position:relative;background:var(--bg-glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);overflow:hidden;transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease)}
.article::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--grad-brand);transform:scaleY(0);transform-origin:top;transition:transform .35s var(--ease)}
.article:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(31,111,235,.28)}
.article:hover::before{transform:scaleY(1)}
.article h3{font-size:17px;margin:0 0 6px;transition:color .25s var(--ease)}
.article:hover h3{color:var(--brand)}
.article .meta{font-size:12.8px;color:var(--muted);margin-bottom:8px}
.article p{font-size:14.6px;color:var(--muted)}
.article a.more{display:inline-block;margin-top:8px;font-size:14px;font-weight:600;transition:transform .25s var(--ease)}
.article a.more:hover{transform:translateX(4px);text-decoration:none}
.faq-item{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:var(--bg-glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);overflow:hidden;transition:box-shadow .3s var(--ease),border-color .3s var(--ease),transform .3s var(--ease)}
.faq-item:hover{box-shadow:var(--shadow);border-color:rgba(31,111,235,.28)}
.faq-item.open{border-color:rgba(31,111,235,.4);box-shadow:var(--shadow-lg)}
.faq-q{width:100%;text-align:left;background:transparent;border:0;padding:16px 18px;font-size:16px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;gap:12px;color:var(--text);font-family:inherit;transition:color .25s var(--ease),background .25s var(--ease)}
.faq-q:hover{color:var(--brand);background:rgba(31,111,235,.05)}
.faq-a{padding:0 18px 16px;color:var(--muted);font-size:14.8px;display:none;animation:fadeSlide .35s var(--ease)}
.faq-item.open .faq-a{display:block}
@keyframes fadeSlide{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.faq-q .plus{color:var(--brand);font-weight:700;font-size:18px;line-height:1;transition:transform .35s var(--ease)}
.faq-item.open .faq-q .plus{transform:rotate(180deg)}
.steps{counter-reset:step;list-style:none}
.steps li{position:relative;padding-left:46px;margin-bottom:16px;transition:transform .3s var(--ease)}
.steps li:hover{transform:translateX(4px)}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--grad-brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;box-shadow:0 6px 16px rgba(31,111,235,.3);transition:transform .3s var(--ease)}
.steps li:hover::before{transform:scale(1.12)}
table{width:100%;border-collapse:collapse;font-size:14.6px;margin-top:10px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top;transition:background .25s var(--ease)}
th{background:var(--bg-soft);font-weight:600}
tbody tr{transition:background .25s var(--ease)}
tbody tr:hover{background:rgba(31,111,235,.05)}
blockquote{border-left:4px solid var(--brand);background:var(--bg-soft);padding:12px 16px;border-radius:8px;color:#33415c;margin:14px 0;font-size:14.8px;transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
blockquote:hover{transform:translateX(4px);box-shadow:var(--shadow)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.info-list{list-style:none;font-size:15px}
.info-list li{padding:8px 0;border-bottom:1px dashed var(--line);color:var(--muted);transition:padding-left .25s var(--ease),color .25s var(--ease)}
.info-list li:hover{padding-left:6px;color:var(--text)}
.info-list li b{color:var(--text);font-weight:600}
.site-footer{position:relative;background:#0f172a;color:#c7d2e0;padding:44px 0 26px;font-size:14.5px;overflow:hidden}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad-brand)}
.site-footer::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(31,111,235,.22),transparent 70%);top:-180px;right:-120px;filter:blur(50px);pointer-events:none}
.site-footer a{color:#9fb6d6;transition:color .25s var(--ease),transform .25s var(--ease)}
.site-footer a:hover{color:#fff;text-decoration:none}
.footer-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:26px}
.site-footer h4{color:#fff;font-size:15.5px;margin-bottom:10px}
.site-footer ul{list-style:none}
.site-footer li{margin:6px 0}
.site-footer li a{display:inline-block}
.site-footer li a:hover{transform:translateX(3px)}
.footer-bottom{position:relative;z-index:1;border-top:1px solid #1f2b40;margin-top:26px;padding-top:16px;color:#8ea1bb;font-size:13.5px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.back-top{position:fixed;right:18px;bottom:22px;width:44px;height:44px;border-radius:50%;background:var(--grad-brand);color:#fff;border:0;cursor:pointer;font-size:18px;box-shadow:0 10px 26px rgba(31,111,235,.4);display:none;z-index:60;transition:transform .3s var(--ease),box-shadow .3s var(--ease),opacity .3s var(--ease)}
.back-top.show{display:block;animation:popIn .35s var(--ease)}
.back-top:hover{transform:translateY(-4px) scale(1.08);box-shadow:0 16px 34px rgba(31,111,235,.5)}
@keyframes popIn{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.visible{opacity:1;transform:none}
.search-box{display:flex;gap:8px;margin-top:12px}
.search-box input{flex:1;border:1px solid var(--line);border-radius:var(--radius-sm);padding:10px 12px;font-size:14.5px;background:var(--bg-glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);color:var(--text);font-family:inherit;transition:border-color .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease)}
.search-box input::placeholder{color:var(--muted)}
.search-box input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px rgba(31,111,235,.14)}
.notice{font-size:13.6px;color:var(--muted);background:var(--bg-glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px dashed var(--line);border-radius:var(--radius-sm);padding:12px 14px;margin-top:14px;transition:border-color .25s var(--ease),color .25s var(--ease)}
.notice:hover{border-color:rgba(31,111,235,.4);color:var(--text)}
body.dark{--bg:#0f1420;--bg-soft:#161d2c;--bg-glass:rgba(21,28,43,.72);--bg-glass-strong:rgba(15,20,32,.86);--text:#e6ecf5;--muted:#9fb0c7;--line:#25304a;--shadow:0 6px 24px rgba(0,0,0,.4);--shadow-lg:0 18px 48px rgba(0,0,0,.55);--grad-hero:linear-gradient(135deg,#141c2c 0%,#1a1533 45%,#0f2626 100%);--grad-card:linear-gradient(140deg,rgba(31,111,235,.14),rgba(124,58,237,.14) 60%,rgba(14,165,164,.14))}
body.dark .site-header{background:var(--bg-glass-strong)}
body.dark .hero{background:var(--grad-hero)}
body.dark .card,body.dark .stat,body.dark .article,body.dark .faq-item,body.dark .faq-q,body.dark .slider,body.dark .toc{background:var(--bg-glass)}
body.dark .btn{background:rgba(27,35,52,.8);color:#e6ecf5}
body.dark .btn-primary{background:var(--grad-brand);color:#fff}
body.dark .card::after{background:linear-gradient(100deg,transparent,rgba(255,255,255,.14),transparent)}
body.dark .dot{background:#33405c}
body.dark .dot.active{background:var(--brand)}
body.dark .toc a{color:#c3d2e8}
body.dark .toc a:hover{color:var(--brand)}
body.dark section h4{color:#c9d6ea}
body.dark blockquote{color:#c3d2e8}
body.dark .search-box input{background:rgba(27,35,52,.8)}
body.dark .notice{background:rgba(27,35,52,.6)}
body.dark table{box-shadow:0 6px 24px rgba(0,0,0,.4)}
body.dark th{background:#1a2233}
body.dark tbody tr:hover{background:rgba(31,111,235,.12)}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}}
@media (max-width:960px){
.hero-grid{grid-template-columns:1fr}
.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
.article-list{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr 1fr}
.contact-grid{grid-template-columns:1fr}
.hero h1{font-size:29px}
}
@media (max-width:640px){
.nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg-glass-strong);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);flex-direction:column;align-items:flex-start;padding:14px 18px;border-bottom:1px solid var(--line);gap:12px;box-shadow:var(--shadow-lg);animation:slideDown .3s var(--ease)}
@keyframes slideDown{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
body.dark .nav-links{background:var(--bg-glass-strong)}
.nav-links.open{display:flex}
.nav-links a{width:100%;padding:6px 0}
.menu-toggle{display:inline-block}
.hero{padding:40px 0 32px}
.hero h1{font-size:25px}
.hero p{font-size:15.5px}
.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
.hero-stats{grid-template-columns:1fr 1fr}
.toc ul{columns:1}
.footer-grid{grid-template-columns:1fr}
section{padding:38px 0}
section h2{font-size:22px}
.search-box{flex-direction:column}
.search-box .btn{width:100%}
.slides{min-height:300px}
.footer-bottom{flex-direction:column}
}
@media (max-width:400px){
.hero-stats{grid-template-columns:1fr}
.hero h1{font-size:22px}
}