/* 快鸭 Kuaiya 官网样式 */
:root{--brand:#FF6B2C;--brand-dark:#E6550F;--amber:#FFB800;--ink:#1A1D23;--ink-2:#2B2F36;--gray:#6B7280;--line:#E8EAEE;--bg:#F7F8FA;--card:#FFFFFF;--teal:#0EA5A4;--radius:14px;--shadow:0 10px 30px rgba(26,29,35,.08)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;color:var(--ink-2);background:var(--bg);line-height:1.7;font-size:16px}
a{color:var(--brand);text-decoration:none;transition:color .2s,background .2s,opacity .2s,transform .2s}
a:hover{color:var(--brand-dark)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
/* 顶部导航 */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{width:38px;height:38px;border-radius:9px}
.brand b{font-size:20px;color:var(--ink);letter-spacing:.5px}
.brand b em{font-style:normal;color:var(--brand)}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{padding:8px 14px;border-radius:9px;color:var(--ink-2);font-size:15px;font-weight:500}
.nav-links a:hover,.nav-links a.active{color:var(--brand);background:rgba(255,107,44,.08)}
.nav-cta{display:flex;align-items:center;gap:8px}
.lang-btn{padding:8px 14px;border-radius:9px;border:1px solid var(--line);color:var(--ink-2);font-size:14px;font-weight:600}
.lang-btn:hover{border-color:var(--brand);color:var(--brand)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:11px;font-weight:700;font-size:16px;line-height:1;cursor:pointer;border:none}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-lg{padding:16px 34px;font-size:17px}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-block{width:100%}
/* Hero */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(255,107,44,.16),transparent),linear-gradient(180deg,#fff,#fbf5f0);border-bottom:1px solid var(--line);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:64px 0 72px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,107,44,.1);color:var(--brand-dark);font-weight:600;font-size:13px;padding:6px 14px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:46px;line-height:1.18;color:var(--ink);font-weight:800;margin-bottom:18px}
.hero h1 span{color:var(--brand)}
.hero p.lead{font-size:18px;color:var(--gray);margin-bottom:26px;max-width:540px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:26px}
.hero-meta{display:flex;gap:26px;flex-wrap:wrap}
.hero-meta div b{display:block;font-size:24px;color:var(--ink)}
.hero-meta div span{font-size:13px;color:var(--gray)}
/* 客户端模拟器 */
.simulator{background:#0F1115;border-radius:18px;box-shadow:0 30px 70px rgba(15,17,21,.35);overflow:hidden;border:1px solid #23262e}
.sim-bar{display:flex;align-items:center;gap:8px;padding:13px 16px;background:#16181d;border-bottom:1px solid #23262e}
.sim-bar i{width:12px;height:12px;border-radius:50%;display:block}
.sim-bar i:nth-child(1){background:#ff5f57}
.sim-bar i:nth-child(2){background:#febc2e}
.sim-bar i:nth-child(3){background:#28c840}
.sim-title{margin-left:10px;color:#9aa0ab;font-size:12px}
.sim-body{padding:22px}
.sim-status{display:flex;align-items:center;gap:12px;background:#1b1e25;border-radius:12px;padding:16px;margin-bottom:16px}
.sim-status .dot{width:10px;height:10px;border-radius:50%;background:#28c840;box-shadow:0 0 0 5px rgba(40,200,64,.15)}
.sim-status b{color:#fff;font-size:16px}
.sim-status span{color:#9aa0ab;font-size:13px}
.sim-node{display:flex;align-items:center;justify-content:space-between;background:#1b1e25;border-radius:12px;padding:14px 16px;margin-bottom:16px}
.sim-node .flag{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--amber));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}
.sim-node b{color:#fff;font-size:15px}
.sim-node span{color:#9aa0ab;font-size:12px}
.sim-speed{display:flex;gap:12px;margin-bottom:16px}
.sim-speed .card{flex:1;background:#1b1e25;border-radius:12px;padding:14px}
.sim-speed .card b{display:block;color:#fff;font-size:22px}
.sim-speed .card span{color:#9aa0ab;font-size:12px}
.sim-btn{display:block;text-align:center;background:var(--brand);color:#fff;padding:14px;border-radius:12px;font-weight:700}
.sim-btn:hover{background:var(--brand-dark);color:#fff}
.sim-note{text-align:center;color:#5b6069;font-size:11px;margin-top:10px}
/* 通用区块 */
section{padding:72px 0}
.sec-head{text-align:center;max-width:680px;margin:0 auto 44px}
.sec-tag{display:inline-block;color:var(--brand);font-weight:700;font-size:14px;letter-spacing:1px;margin-bottom:10px}
.sec-head h2{font-size:34px;color:var(--ink);font-weight:800;margin-bottom:14px}
.sec-head p{color:var(--gray);font-size:16px}
/* 卖点 */
.selling{background:#fff}
.selling-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.selling-card{background:var(--bg);border-radius:var(--radius);padding:30px;border:1px solid var(--line);transition:transform .2s,box-shadow .2s}
.selling-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.selling-card .icon{width:52px;height:52px;border-radius:13px;background:rgba(255,107,44,.12);display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:24px}
.selling-card h3{font-size:20px;color:var(--ink);margin-bottom:10px}
.selling-card p{color:var(--gray);font-size:15px}
/* 核心功能 */
.features{background:var(--bg)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:#fff;border-radius:var(--radius);padding:30px;border:1px solid var(--line)}
.feature-card .icon{font-size:30px;margin-bottom:14px}
.feature-card h3{font-size:19px;color:var(--ink);margin-bottom:10px}
.feature-card p{color:var(--gray);font-size:15px}
/* 公告 */
.announce{background:#fff}
.announce-list{max-width:820px;margin:0 auto}
.announce-item{display:flex;gap:16px;align-items:flex-start;padding:18px 0;border-bottom:1px solid var(--line)}
.announce-item .tag{flex-shrink:0;background:rgba(255,107,44,.1);color:var(--brand-dark);font-size:12px;font-weight:700;padding:3px 10px;border-radius:6px}
.announce-item b{color:var(--ink)}
.announce-item p{color:var(--gray);font-size:14px;margin-top:4px}
/* 信任背书 */
.trust{background:linear-gradient(180deg,var(--ink),#23262e);color:#fff}
.trust .sec-head h2{color:#fff}
.trust .sec-head p{color:#9aa0ab}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.trust-card b{display:block;font-size:34px;color:var(--amber);margin-bottom:6px}
.trust-card span{color:#c4c8d0;font-size:15px}
/* 应用场景 */
.scenario{background:#fff}
.scenario-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.scenario-card{background:var(--bg);border-radius:var(--radius);padding:28px;border:1px solid var(--line)}
.scenario-card h3{color:var(--ink);font-size:19px;margin-bottom:10px}
.scenario-card p{color:var(--gray);font-size:15px}
/* 对比 */
.compare{background:var(--bg)}
.compare-table{overflow-x:auto;background:#fff;border-radius:var(--radius);border:1px solid var(--line)}
table{width:100%;border-collapse:collapse;min-width:640px}
th,td{padding:16px 20px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
th{background:#fafbfc;color:var(--ink);font-weight:700}
td:first-child,th:first-child{font-weight:600;color:var(--ink)}
td.ok{color:var(--teal);font-weight:700}
td.no{color:#c4c8d0}
tr:last-child td{border-bottom:none}
/* 新闻 Tab */
.news{background:#fff}
.tabs{display:flex;justify-content:center;gap:8px;margin-bottom:32px;flex-wrap:wrap}
.tab{display:inline-flex;align-items:center;padding:10px 22px;border-radius:999px;background:var(--bg);color:var(--ink-2);font-weight:600;font-size:15px;border:1px solid var(--line)}
.tab.active,.tab:hover{background:var(--brand);color:#fff;border-color:var(--brand)}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:var(--bg);border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);transition:transform .2s,box-shadow .2s}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.news-card img{width:100%;height:170px;object-fit:cover}
.news-card .body{padding:20px}
.news-card .meta{font-size:12px;color:var(--gray);margin-bottom:8px}
.news-card h3{font-size:17px;color:var(--ink);line-height:1.4;margin-bottom:10px}
.news-card h3 a{color:var(--ink)}
.news-card h3 a:hover{color:var(--brand)}
.news-card p{color:var(--gray);font-size:14px}
/* 新闻Tab切换(纯CSS无JS) */
.tab-panel{display:none}
.tab-panel:target{display:grid}
.tab-panel.default{display:grid}
.news .panels:has(.tab-panel:target) .tab-panel.default{display:none}
/* 评论 */
.reviews{background:var(--bg)}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#fff;border-radius:var(--radius);padding:26px;border:1px solid var(--line)}
.review-card .stars{color:var(--amber);font-size:16px;margin-bottom:12px}
.review-card p{color:var(--ink-2);font-size:15px;margin-bottom:16px}
.review-card .user{display:flex;align-items:center;gap:12px}
.review-card .avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--amber));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}
.review-card .user b{color:var(--ink);font-size:14px;display:block}
.review-card .user span{color:var(--gray);font-size:12px}
/* 下载区 */
.download{background:#fff}
.download-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.download-card{background:var(--bg);border-radius:var(--radius);padding:26px 18px;text-align:center;border:1px solid var(--line);transition:transform .2s,box-shadow .2s}
.download-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.download-card .os{font-size:34px;margin-bottom:12px}
.download-card h3{font-size:17px;color:var(--ink);margin-bottom:6px}
.download-card span{color:var(--gray);font-size:13px;display:block;margin-bottom:16px}
/* FAQ */
.faq{background:var(--bg)}
.faq-cats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:40px}
.faq-cat{background:#fff;border-radius:var(--radius);padding:24px;border:1px solid var(--line);text-align:center}
.faq-cat .icon{font-size:28px;margin-bottom:10px}
.faq-cat h3{font-size:17px;color:var(--ink);margin-bottom:6px}
.faq-cat a{font-weight:600}
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border-radius:var(--radius);margin-bottom:14px;border:1px solid var(--line);overflow:hidden}
.faq-item summary{cursor:pointer;padding:20px 24px;font-weight:600;color:var(--ink);font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;color:var(--brand);font-weight:400}
.faq-item[open] summary::after{content:"−"}
.faq-item .answer{padding:0 24px 22px;color:var(--gray);font-size:15px}
.faq-item .answer ol{padding-left:20px;margin-top:10px;list-style:decimal}
.faq-item .answer ol li{margin-bottom:8px}
.faq-item .answer h4{margin:10px 0 6px;color:var(--ink);font-size:15px}
/* CTA */
.cta{background:linear-gradient(135deg,var(--brand),var(--brand-dark));color:#fff;text-align:center}
.cta h2{font-size:36px;font-weight:800;margin-bottom:14px}
.cta p{font-size:17px;margin-bottom:28px;opacity:.95}
.cta .btn-primary{background:#fff;color:var(--brand)}
.cta .btn-primary:hover{background:var(--ink);color:#fff}
/* 页脚 */
.site-footer{background:var(--ink);color:#9aa0ab;padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:36px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer-col a{display:block;color:#9aa0ab;margin-bottom:10px;font-size:14px}
.footer-col a:hover{color:var(--amber)}
.footer-brand img{width:40px;height:40px;border-radius:9px;margin-bottom:12px}
.footer-brand p{font-size:14px;line-height:1.8}
.friend-links{display:flex;flex-wrap:wrap;gap:10px 22px;padding:20px 0;border-top:1px solid #2a2d34}
.friend-links a{color:#6b7280;font-size:13px}
.friend-links a:hover{color:var(--amber)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;padding:20px 0;border-top:1px solid #2a2d34;font-size:13px}
/* 面包屑 */
.breadcrumb{background:#fff;border-bottom:1px solid var(--line);padding:14px 0;font-size:14px;color:var(--gray)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb li+li::before{content:"/";margin-right:6px;color:#c4c8d0}
.breadcrumb a{color:var(--gray)}
.breadcrumb a:hover{color:var(--brand)}
/* 内页标题 */
.page-hero{background:linear-gradient(180deg,#fff,#fbf5f0);border-bottom:1px solid var(--line);padding:44px 0}
.page-hero h1{font-size:34px;color:var(--ink);font-weight:800;margin-bottom:10px}
.page-hero p{color:var(--gray);max-width:680px}
/* 文章详情 */
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:40px;align-items:start}
.article-main{background:#fff;border-radius:var(--radius);padding:40px;border:1px solid var(--line)}
.article-main .article-meta{display:flex;gap:16px;color:var(--gray);font-size:13px;margin-bottom:18px;flex-wrap:wrap}
.article-main h1{font-size:30px;color:var(--ink);font-weight:800;line-height:1.3;margin-bottom:20px}
.article-main h2{font-size:22px;color:var(--ink);margin:32px 0 14px;padding-left:12px;border-left:4px solid var(--brand)}
.article-main h3{font-size:18px;color:var(--ink);margin:24px 0 10px}
.article-main p{color:var(--ink-2);margin-bottom:16px;line-height:1.9}
.article-main img{border-radius:12px;margin:20px 0}
.article-main .figcaption{color:var(--gray);font-size:13px;text-align:center;margin-top:-12px;margin-bottom:20px}
.article-main ul,.article-main ol{padding-left:24px;margin-bottom:16px}
.article-main ul{list-style:disc}
.article-main ol{list-style:decimal}
.article-main li{margin-bottom:8px}
.article-main blockquote{border-left:4px solid var(--amber);background:#fbf8f3;padding:16px 20px;margin:20px 0;color:var(--ink-2);border-radius:0 10px 10px 0}
.article-main table{width:100%;border-collapse:collapse;margin:20px 0;min-width:0}
.article-main th,.article-main td{border:1px solid var(--line);padding:12px 14px;font-size:14px}
.article-main th{background:#fafbfc}
.article-toc{background:#fafbfc;border-radius:10px;padding:20px;margin-bottom:28px;border:1px solid var(--line)}
.article-toc h4{color:var(--ink);margin-bottom:12px}
.article-toc a{display:block;color:var(--ink-2);font-size:14px;padding:5px 0}
.article-toc a:hover{color:var(--brand)}
.article-nav{display:flex;justify-content:space-between;gap:16px;margin-top:36px;padding-top:20px;border-top:1px solid var(--line)}
.article-nav a{font-size:14px}
/* 侧栏 */
.sidebar .side-widget{background:#fff;border-radius:var(--radius);padding:24px;border:1px solid var(--line);margin-bottom:20px}
.sidebar .side-widget h4{color:var(--ink);margin-bottom:16px;font-size:16px}
.sidebar .side-widget a{display:block;color:var(--ink-2);font-size:14px;padding:8px 0;border-bottom:1px dashed var(--line)}
.sidebar .side-widget a:last-child{border-bottom:none}
.sidebar .side-widget a:hover{color:var(--brand)}
/* 相关阅读 */
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:24px}
.related-card{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.related-card img{width:100%;height:120px;object-fit:cover}
.related-card .body{padding:16px}
.related-card h3{font-size:14px;line-height:1.5}
.related-card h3 a{color:var(--ink)}
.related-card h3 a:hover{color:var(--brand)}
/* 404 */
.error-page{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;background:radial-gradient(800px 400px at 50% -10%,rgba(255,107,44,.15),transparent),var(--bg)}
.error-box h1{font-size:120px;font-weight:900;color:var(--brand);line-height:1}
.error-box h2{font-size:26px;color:var(--ink);margin:16px 0 10px}
.error-box p{color:var(--gray);margin-bottom:28px}
/* sitemap */
.sitemap-section{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.sitemap-col{background:#fff;border-radius:var(--radius);padding:28px;border:1px solid var(--line)}
.sitemap-col h3{color:var(--ink);margin-bottom:14px}
.sitemap-col a{display:block;color:var(--ink-2);font-size:14px;padding:6px 0;border-bottom:1px dashed var(--line)}
.sitemap-col a:last-child{border-bottom:none}
.sitemap-col a:hover{color:var(--brand)}
/* 响应式 */
@media(max-width:1024px){.hero-grid{grid-template-columns:1fr}.simulator{max-width:520px}.selling-grid,.features-grid,.scenario-grid,.reviews-grid,.news-grid,.download-grid,.trust-grid,.footer-grid,.sitemap-section,.related-grid{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:1fr}.sidebar{display:none}}
@media(max-width:640px){.hero h1{font-size:32px}.nav-links{display:none}.selling-grid,.features-grid,.scenario-grid,.reviews-grid,.news-grid,.download-grid,.trust-grid,.footer-grid,.sitemap-section,.related-grid{grid-template-columns:1fr}.download-grid{grid-template-columns:repeat(2,1fr)}.article-main{padding:24px}.sec-head h2{font-size:26px}}