/* iKuuu 官网样式 - 深色安全科技风 */
:root{
  --bg:#0b1220;--bg2:#0f1a2e;--panel:#141f36;--panel2:#1a2842;
  --line:#223350;--txt:#e8eef7;--muted:#9db0c9;--accent:#22d3a7;
  --accent2:#4f8cff;--accent3:#7c5cff;--warn:#ffb020;--danger:#ff5c7a;
  --radius:16px;--radius-s:10px;--shadow:0 12px 40px rgba(3,8,18,.55);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,-apple-system,sans-serif;background:var(--bg);color:var(--txt);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{color:#4fe0bd}
img{max-width:100%;display:block}
ul,ol{list-style:none}
.container{max-width:1180px;margin:0 auto;padding:0 22px}
.section{padding:72px 0}
.section-head{text-align:center;margin-bottom:46px}
.section-head .kicker{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--accent);text-transform:uppercase;font-weight:600;margin-bottom:12px}
.section-head h2{font-size:34px;font-weight:700;line-height:1.3;letter-spacing:.5px}
.section-head p{color:var(--muted);max-width:680px;margin:14px auto 0;font-size:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;border-radius:50px;font-weight:600;font-size:15px;transition:.25s;border:none;cursor:pointer;letter-spacing:.3px}
.btn-primary{background:linear-gradient(135deg,var(--accent),#12b48c);color:#04140f;box-shadow:0 8px 24px rgba(34,211,167,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(34,211,167,.5);color:#04140f}
.btn-ghost{background:transparent;color:var(--txt);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-lg{padding:16px 36px;font-size:16px}

/* 顶部导航 */
.topbar{position:sticky;top:0;z-index:100;background:rgba(11,18,32,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{width:38px;height:38px;border-radius:9px}
.brand b{font-size:20px;letter-spacing:.5px}
.brand span{color:var(--accent)}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{color:var(--muted);padding:8px 14px;border-radius:8px;font-size:15px;font-weight:500}
.nav-links a:hover{color:var(--txt);background:rgba(255,255,255,.05)}
.nav-links a.active{color:var(--accent)}
.nav-cta{display:flex;gap:10px;align-items:center}

/* Hero */
.hero{position:relative;overflow:hidden;padding:80px 0 70px;background:radial-gradient(1200px 500px at 70% -10%,rgba(79,140,255,.18),transparent),radial-gradient(900px 400px at 10% 10%,rgba(34,211,167,.12),transparent)}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.hero-txt .badge{display:inline-flex;align-items:center;gap:8px;background:rgba(34,211,167,.12);color:var(--accent);border:1px solid rgba(34,211,167,.3);padding:6px 16px;border-radius:50px;font-size:13px;margin-bottom:20px}
.hero-txt h1{font-size:46px;font-weight:800;line-height:1.22;letter-spacing:.5px}
.hero-txt h1 .grad{background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-txt .sub{color:var(--muted);font-size:17px;margin:20px 0 28px;max-width:520px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:34px;margin-top:34px}
.hero-stats .st b{font-size:26px;display:block;color:var(--accent)}
.hero-stats .st span{color:var(--muted);font-size:13px}

/* 客户端模拟器 */
.simulator{background:linear-gradient(160deg,#0d1626,#111d33);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.sim-top{display:flex;align-items:center;gap:8px;padding:14px 18px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.03)}
.sim-dot{width:12px;height:12px;border-radius:50%}
.sim-dot.r{background:#ff5f57}.sim-dot.y{background:#febc2e}.sim-dot.g{background:#28c840}
.sim-title{margin-left:10px;color:var(--muted);font-size:13px}
.sim-body{padding:24px}
.sim-conn{display:flex;align-items:center;justify-content:space-between;background:var(--panel2);border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:16px}
.sim-conn .loc{display:flex;align-items:center;gap:10px}
.sim-conn .flag{font-size:26px}
.sim-conn .loc b{font-size:16px}
.sim-conn .loc span{color:var(--muted);font-size:12px;display:block}
.sim-btn{background:var(--accent);color:#04140f;border:none;padding:10px 22px;border-radius:30px;font-weight:700;font-size:14px;cursor:pointer}
.sim-btn.off{background:var(--panel2);color:var(--muted);border:1px solid var(--line)}
.sim-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.sim-metric{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}
.sim-metric b{font-size:20px;color:var(--accent);display:block}
.sim-metric span{color:var(--muted);font-size:12px}

/* 公告 */
.notice{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px 22px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.notice .tag{background:var(--warn);color:#1a1200;font-size:12px;font-weight:700;padding:3px 12px;border-radius:6px;white-space:nowrap}
.notice p{color:var(--txt);font-size:15px}
.notice a{font-weight:600}

/* 卡片 */
.cards{display:grid;gap:22px}
.cards.cols-2{grid-template-columns:repeat(2,1fr)}
.cards.cols-3{grid-template-columns:repeat(3,1fr)}
.cards.cols-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.25s}
.card:hover{transform:translateY(-5px);border-color:var(--accent);box-shadow:var(--shadow)}
.card .ico{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:18px;background:linear-gradient(135deg,rgba(34,211,167,.16),rgba(79,140,255,.16));border:1px solid rgba(34,211,167,.2)}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:14.5px}

/* 对比表 */
.compare{overflow-x:auto}
.compare table{width:100%;border-collapse:collapse;min-width:680px}
.compare th,.compare td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
.compare thead th{background:var(--panel2);font-size:15px}
.compare thead th.hl{background:rgba(34,211,167,.14);color:var(--accent)}
.compare td.flag{font-size:22px}
.compare .yes{color:var(--accent);font-weight:700}
.compare .no{color:var(--muted)}
.compare tbody tr:hover{background:rgba(255,255,255,.03)}

/* 新闻Tabs */
.tabs{display:flex;gap:10px;justify-content:center;margin-bottom:32px;flex-wrap:wrap}
.tab-btn{background:var(--panel);border:1px solid var(--line);color:var(--muted);padding:9px 20px;border-radius:50px;font-size:14px;cursor:pointer}
.tab-btn.active{background:var(--accent);color:#04140f;border-color:var(--accent);font-weight:600}
.tab-pane{display:none}
.tab-pane.active{display:block}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.news-item{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s}
.news-item:hover{transform:translateY(-4px);border-color:var(--accent)}
.news-item .thumb{height:150px;background:linear-gradient(135deg,var(--panel2),#1e3050);display:flex;align-items:center;justify-content:center;font-size:42px}
.news-item .body{padding:20px}
.news-item .cat{font-size:12px;color:var(--accent);font-weight:600;letter-spacing:1px}
.news-item h3{font-size:16px;margin:8px 0;line-height:1.5}
.news-item h3 a{color:var(--txt)}
.news-item h3 a:hover{color:var(--accent)}
.news-item .date{color:var(--muted);font-size:13px}

/* 评论 */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.review{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.review .stars{color:var(--warn);font-size:15px;margin-bottom:12px;letter-spacing:2px}
.review p{color:var(--txt);font-size:15px;margin-bottom:16px}
.review .who{display:flex;align-items:center;gap:12px}
.review .avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));display:flex;align-items:center;justify-content:center;font-weight:700;color:#04140f}
.review .who b{display:block;font-size:14px}
.review .who span{color:var(--muted);font-size:12px}

/* 下载区 */
.dl-platforms{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.dl-item{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px 16px;text-align:center;transition:.25s}
.dl-item:hover{transform:translateY(-5px);border-color:var(--accent)}
.dl-item .ico{font-size:40px;margin-bottom:14px}
.dl-item b{display:block;font-size:16px;margin-bottom:6px}
.dl-item span{color:var(--muted);font-size:12px;display:block;margin-bottom:16px}
.dl-item a.btn{font-size:13px;padding:9px 20px}

/* 信任背书 */
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.trust-item{text-align:center;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px 18px}
.trust-item .ico{font-size:36px;margin-bottom:12px}
.trust-item b{display:block;font-size:15px;margin-bottom:6px}
.trust-item span{color:var(--muted);font-size:13px}

/* 应用场景 */
.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.scene{position:relative;border-radius:var(--radius);overflow:hidden;padding:34px 28px;background:var(--panel);border:1px solid var(--line);min-height:200px}
.scene .ico{font-size:38px;margin-bottom:14px}
.scene h3{font-size:18px;margin-bottom:8px}
.scene p{color:var(--muted);font-size:14px}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-s);margin-bottom:14px;overflow:hidden}
.faq-q{padding:20px 24px;cursor:pointer;font-weight:600;font-size:16px;display:flex;justify-content:space-between;align-items:center}
.faq-q .arr{transition:.3s;color:var(--accent)}
.faq-item.open .faq-q .arr{transform:rotate(180deg)}
.faq-a{display:none;padding:0 24px 22px;color:var(--muted);font-size:15px}
.faq-item.open .faq-a{display:block}
.faq-a ol{padding-left:20px;list-style:decimal}
.faq-a ol li{margin-bottom:8px}
.faq-a p{margin-bottom:12px}

/* CTA */
.cta{background:linear-gradient(135deg,#0f1f38,#122a4a);border:1px solid var(--line);border-radius:24px;padding:56px 40px;text-align:center;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 50% -20%,rgba(34,211,167,.22),transparent)}
.cta h2{font-size:32px;margin-bottom:14px;position:relative}
.cta p{color:var(--muted);max-width:560px;margin:0 auto 28px;position:relative}
.cta .btn{position:relative}

/* 页脚 */
footer{background:#080d17;border-top:1px solid var(--line);padding:52px 0 26px;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;margin-bottom:36px}
.footer-col .brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-col .brand img{width:32px;height:32px;border-radius:7px}
.footer-col p{color:var(--muted);font-size:13.5px;max-width:280px}
.footer-col h4{font-size:15px;margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{color:var(--muted);font-size:14px}
.footer-col ul a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{color:var(--muted);font-size:13px}
.footer-bottom a{color:var(--muted);font-size:13px}
.footer-bottom a:hover{color:var(--accent)}

/* 面包屑 */
.crumbs{font-size:13.5px;color:var(--muted);margin-bottom:22px}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--accent)}
.crumbs span{color:var(--txt)}

/* 页面头部 */
.page-hero{padding:60px 0 20px;text-align:center}
.page-hero h1{font-size:38px;font-weight:800;margin-bottom:12px}
.page-hero p{color:var(--muted);max-width:640px;margin:0 auto;font-size:16px}

/* 新闻详情 */
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:40px;padding:30px 0 70px}
.article-main h1{font-size:30px;line-height:1.4;margin-bottom:16px}
.article-meta{display:flex;gap:18px;color:var(--muted);font-size:13.5px;margin-bottom:26px;flex-wrap:wrap}
.article-meta .cat{color:var(--accent);font-weight:600}
.article-body{color:#cdd9ea;font-size:16px}
.article-body h2{font-size:23px;margin:34px 0 14px;color:var(--txt);border-left:4px solid var(--accent);padding-left:14px}
.article-body h3{font-size:18px;margin:26px 0 10px;color:var(--txt)}
.article-body p{margin-bottom:16px}
.article-body img{border-radius:12px;margin:20px 0;border:1px solid var(--line)}
.article-body table{width:100%;border-collapse:collapse;margin:20px 0}
.article-body table th,.article-body table td{padding:12px 14px;border:1px solid var(--line);font-size:14px;text-align:left}
.article-body table th{background:var(--panel2)}
.article-body ul,.article-body ol{padding-left:22px;margin-bottom:16px}
.article-body ul li,.article-body ol li{margin-bottom:8px;list-style:disc}
.article-body ol li{list-style:decimal}
.article-body blockquote{border-left:4px solid var(--accent);background:var(--panel);padding:16px 20px;border-radius:0 10px 10px 0;margin:20px 0;color:var(--txt)}
.article-nav{display:flex;justify-content:space-between;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
.article-nav a{flex:1;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;color:var(--txt);font-size:14px}
.article-nav a:hover{border-color:var(--accent)}
.article-nav a span{display:block;color:var(--muted);font-size:12px;margin-bottom:6px}
.article-comments{margin-top:40px}
.article-comments h3{font-size:20px;margin-bottom:20px}
.sidebar{position:sticky;top:90px;align-self:start}
.side-box{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:22px}
.side-box h3{font-size:16px;margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.side-box ul li{margin-bottom:12px}
.side-box ul a{color:var(--muted);font-size:14px;line-height:1.5;display:block}
.side-box ul a:hover{color:var(--accent)}
.side-box .hot-rank{display:flex;gap:10px;align-items:baseline}
.side-box .hot-rank b{color:var(--accent);font-size:20px}

/* 404 */
.err-wrap{min-height:70vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:60px 20px}
.err-box h1{font-size:120px;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1}
.err-box h2{font-size:26px;margin:20px 0 14px}
.err-box p{color:var(--muted);margin-bottom:30px}

/* sitemap */
.sitemap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px}
.sitemap-box{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.sitemap-box h2{font-size:18px;margin-bottom:16px;color:var(--accent)}
.sitemap-box ul li{margin-bottom:10px}
.sitemap-box ul a{color:var(--muted);font-size:14.5px}
.sitemap-box ul a:hover{color:var(--accent)}

/* 纯CSS Tabs */
.tabs-css input{display:none}
.tabs-css .tab-labels{display:flex;gap:10px;justify-content:center;margin-bottom:32px;flex-wrap:wrap}
.tabs-css .tab-labels label{background:var(--panel);border:1px solid var(--line);color:var(--muted);padding:9px 20px;border-radius:50px;font-size:14px;cursor:pointer;transition:.25s}
.tabs-css .tab-panels .panel{display:none}
.tabs-css input#t1:checked ~ .tab-panels .p1{display:block}
.tabs-css input#t2:checked ~ .tab-panels .p2{display:block}
.tabs-css input#t3:checked ~ .tab-panels .p3{display:block}
.tabs-css input#t1:checked ~ .tab-labels label[for="t1"],
.tabs-css input#t2:checked ~ .tab-labels label[for="t2"],
.tabs-css input#t3:checked ~ .tab-labels label[for="t3"]{background:var(--accent);color:#04140f;border-color:var(--accent);font-weight:600}

/* 原生 details FAQ */
.faq-item details summary{list-style:none;cursor:pointer}
.faq-item details summary::-webkit-details-marker{display:none}
.faq-item details summary .arr{transition:.3s;color:var(--accent)}
.faq-item details[open] summary .arr{transform:rotate(180deg)}

/* 响应式 */
@media(max-width:1024px){
  .hero-inner{grid-template-columns:1fr}
  .cards.cols-4,.dl-platforms,.trust{grid-template-columns:repeat(2,1fr)}
  .news-grid,.reviews,.scenes{grid-template-columns:repeat(2,1fr)}
  .cards.cols-3{grid-template-columns:repeat(2,1fr)}
  .article-layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .nav-links{display:none}
  .cards.cols-2,.cards.cols-3,.cards.cols-4,.news-grid,.reviews,.scenes,.dl-platforms,.trust{grid-template-columns:1fr}
  .hero-txt h1{font-size:32px}
  .section-head h2{font-size:26px}
  .sitemap-grid{grid-template-columns:1fr}
}