/* ===== iKuuu 品牌官网 - 深海航行母题 ===== */
:root{
  --bg:#0a0f1e; --bg2:#0e1528; --surface:#121a30; --surface2:#182238;
  --border:#1f2b46; --border2:#2a3a5e;
  --text:#e8edf7; --muted:#94a3c0; --faint:#64748b;
  --teal:#14b8a6; --sky:#0ea5e9; --cyan:#22d3ee; --green:#34d399;
  --grad:linear-gradient(135deg,#14b8a6 0%,#0ea5e9 100%);
  --grad-soft:linear-gradient(135deg,rgba(20,184,166,.16),rgba(14,165,233,.16));
  --radius:16px; --shadow:0 12px 40px rgba(2,8,23,.55);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none;transition:.25s}
img{max-width:100%;display:block}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:72px 0}
.section-head{text-align:center;max-width:760px;margin:0 auto 48px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);margin-bottom:12px}
.section-title{font-size:34px;line-height:1.25;font-weight:800;letter-spacing:-.01em}
.section-sub{color:var(--muted);margin-top:14px;font-size:16px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;border-radius:12px;font-weight:700;font-size:15px;border:1px solid transparent;cursor:pointer}
.btn-primary{background:var(--grad);color:#04121a;box-shadow:0 8px 24px rgba(14,165,233,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(14,165,233,.5)}
.btn-ghost{border-color:var(--border2);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-lg{padding:16px 34px;font-size:16px}

/* 顶栏 */
.topbar{position:sticky;top:0;z-index:100;background:rgba(10,15,30,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px}
.brand img{width:34px;height:34px;border-radius:8px}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{color:var(--muted);font-size:15px;font-weight:600}
.nav-links a:hover{color:var(--cyan)}
.nav-cta{display:flex;align-items:center;gap:12px}

/* Hero + 模拟器 */
.hero{position:relative;padding:84px 0 64px;overflow:hidden;background:radial-gradient(1000px 500px at 80% -10%,rgba(14,165,233,.14),transparent 60%),radial-gradient(800px 500px at 10% 10%,rgba(20,184,166,.12),transparent 55%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:44px;line-height:1.18;font-weight:900;letter-spacing:-.02em}
.hero h1 .grad-text{display:block}
.hero p.lead{color:var(--muted);font-size:18px;margin:20px 0 28px;max-width:520px}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.badge{font-size:13px;font-weight:600;color:var(--cyan);background:var(--grad-soft);border:1px solid rgba(34,211,238,.25);padding:6px 14px;border-radius:999px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:32px;margin-top:36px}
.hstat b{display:block;font-size:26px;font-weight:800;color:#fff}
.hstat span{color:var(--muted);font-size:13px}

/* 客户端模拟器 */
.app-mock{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.mock-titlebar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--surface2);border-bottom:1px solid var(--border)}
.dot{width:12px;height:12px;border-radius:50%}
.dot.r{background:#f87171}.dot.y{background:#fbbf24}.dot.g{background:#34d399}
.mock-title{flex:1;text-align:center;color:var(--faint);font-size:12px;font-weight:600}
.mock-body{padding:20px;display:grid;gap:14px}
.mock-status{display:flex;align-items:center;gap:10px;background:var(--grad-soft);border:1px solid rgba(34,211,238,.2);border-radius:12px;padding:14px}
.mock-status .ping{width:10px;height:10px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(52,211,153,.2);animation:pulse 1.6s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(52,211,153,.45)}70%{box-shadow:0 0 0 8px rgba(52,211,153,0)}100%{box-shadow:0 0 0 0 rgba(52,211,153,0)}}
.mock-status b{font-size:14px}
.mock-node{display:flex;justify-content:space-between;align-items:center;background:var(--surface2);border:1px solid var(--border);border-radius:12px;padding:12px 14px}
.mock-node .flag{font-size:22px}
.mock-node .nm{font-weight:700;font-size:14px}
.mock-node .ms{color:var(--green);font-size:13px;font-weight:700}
.mock-speed{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.mock-speed .box{background:var(--surface2);border:1px solid var(--border);border-radius:12px;padding:12px;text-align:center}
.mock-speed .box b{font-size:20px;color:var(--cyan)}
.mock-speed .box span{display:block;color:var(--faint);font-size:12px}
.mock-chart{height:64px;background:var(--surface2);border-radius:12px;border:1px solid var(--border);position:relative;overflow:hidden}
.mock-chart .bar{position:absolute;bottom:0;width:7px;border-radius:4px 4px 0 0;background:var(--grad)}

/* 公告 */
.notice-bar{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;display:flex;align-items:center;gap:14px;margin-bottom:0}
.notice-bar .tag{background:var(--grad);color:#04121a;font-weight:800;font-size:13px;padding:4px 12px;border-radius:8px;white-space:nowrap}
.notice-bar p{color:var(--muted);font-size:14px}

/* 节点速度 */
.speed-table{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.speed-table table{width:100%;border-collapse:collapse}
.speed-table th{background:var(--surface2);color:var(--muted);font-size:13px;font-weight:700;text-align:left;padding:14px 18px;border-bottom:1px solid var(--border)}
.speed-table td{padding:13px 18px;border-bottom:1px solid var(--border);font-size:14px}
.speed-table tr:last-child td{border-bottom:none}
.speed-table .good{color:var(--green);font-weight:700}
.speed-table .flag{font-size:18px;margin-right:8px}

/* 功能卡片 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:.3s}
.card:hover{transform:translateY(-6px);border-color:var(--border2);box-shadow:var(--shadow)}
.card .ico{width:52px;height:52px;border-radius:14px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:18px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:14.5px}

/* 对比表 */
.compare{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto;box-shadow:var(--shadow)}
.compare table{width:100%;border-collapse:collapse;min-width:680px}
.compare th,.compare td{padding:15px 18px;text-align:center;border-bottom:1px solid var(--border);font-size:14px}
.compare th{background:var(--surface2);color:var(--muted);font-weight:700}
.compare td:first-child{text-align:left;font-weight:600}
.compare .win{color:var(--green);font-weight:800}
.compare .lose{color:var(--faint)}
.compare .me{background:rgba(14,165,233,.06)}

/* 下载区 */
.dl-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.dl-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:26px 18px;text-align:center;transition:.3s}
.dl-card:hover{border-color:var(--cyan);transform:translateY(-4px)}
.dl-card .os{font-size:40px;margin-bottom:14px}
.dl-card h4{font-size:16px;margin-bottom:6px}
.dl-card p{color:var(--faint);font-size:12.5px;margin-bottom:16px}
.dl-card a{display:block;background:var(--grad);color:#04121a;font-weight:700;padding:10px;border-radius:10px;font-size:14px}
.dl-card a:hover{filter:brightness(1.08)}

/* 应用场景 */
.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.scene{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:26px}
.scene .ico{font-size:32px;margin-bottom:14px}
.scene h3{font-size:17px;margin-bottom:8px}
.scene p{color:var(--muted);font-size:14px}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:14px;margin-bottom:16px;overflow:hidden}
.faq-q{padding:20px 24px;display:flex;justify-content:space-between;align-items:center;font-weight:700;font-size:16px}
.faq-q .q-tag{color:var(--cyan);margin-right:10px}
.faq-a{padding:0 24px 22px;color:var(--muted);font-size:14.5px}
.faq-a ol{margin-left:20px;margin-top:10px;display:grid;gap:8px}
.faq-a ol li{list-style:decimal}
.faq-a .step{color:var(--text);font-weight:600}
.cat-pill{display:inline-block;font-size:12px;color:var(--green);border:1px solid rgba(52,211,153,.3);padding:2px 10px;border-radius:999px;margin-right:6px}

/* 评论 */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.review{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.review .stars{color:#fbbf24;font-size:15px;letter-spacing:2px;margin-bottom:12px}
.review p{color:var(--muted);font-size:14.5px;margin-bottom:16px}
.review .who{display:flex;align-items:center;gap:10px}
.review .avatar{width:38px;height:38px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;font-weight:800;color:#04121a}
.review .who b{font-size:14px;display:block}
.review .who span{color:var(--faint);font-size:12.5px}

/* 新闻 */
.news-tabs{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-bottom:36px}
.news-tabs a{padding:9px 20px;border-radius:999px;border:1px solid var(--border2);color:var(--muted);font-size:14px;font-weight:600}
.news-tabs a.active,.news-tabs a:hover{background:var(--grad);color:#04121a;border-color:transparent}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.news-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.3s}
.news-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.news-card .thumb{height:150px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:40px}
.news-card .meta{padding:18px}
.news-card .date{color:var(--faint);font-size:12.5px;margin-bottom:8px}
.news-card h4{font-size:15.5px;line-height:1.5;margin-bottom:8px}
.news-card p{color:var(--muted);font-size:13.5px}

/* CTA */
.cta{background:var(--grad);border-radius:24px;padding:56px 40px;text-align:center;position:relative;overflow:hidden}
.cta h2{font-size:32px;font-weight:900;color:#04121a;margin-bottom:14px}
.cta p{color:rgba(4,18,26,.75);margin-bottom:26px;font-size:16px}
.cta .btn{background:#04121a;color:var(--cyan)}
.cta .btn:hover{transform:translateY(-2px)}

/* 页脚 */
.footer{background:var(--bg2);border-top:1px solid var(--border);padding:56px 0 24px;margin-top:24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer .brand{margin-bottom:14px}
.footer p.desc{color:var(--muted);font-size:14px;max-width:280px}
.footer h5{font-size:15px;margin-bottom:16px}
.footer-links a{display:block;color:var(--muted);font-size:14px;margin-bottom:10px}
.footer-links a:hover{color:var(--cyan)}
.footer-bottom{border-top:1px solid var(--border);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:var(--faint);font-size:13px}
.footer-bottom a{color:var(--faint)}
.footer-bottom a:hover{color:var(--cyan)}

/* 面包屑 */
.breadcrumb{display:flex;align-items:center;gap:8px;color:var(--faint);font-size:13.5px;margin:20px 0;flex-wrap:wrap}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb .sep{color:var(--faint)}

/* 内页 hero */
.page-hero{padding:56px 0 40px;text-align:center;background:radial-gradient(700px 300px at 50% -20%,rgba(14,165,233,.12),transparent 60%)}
.page-hero h1{font-size:38px;font-weight:900;letter-spacing:-.01em}
.page-hero p{color:var(--muted);margin-top:12px;max-width:640px;margin-left:auto;margin-right:auto}

/* 文章详情 */
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:40px;align-items:start}
.article-main{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:40px;overflow:hidden}
.article-main h1{font-size:30px;line-height:1.3;font-weight:900;margin:16px 0}
.article-meta{display:flex;gap:18px;flex-wrap:wrap;color:var(--faint);font-size:13.5px;margin-bottom:22px}
.article-main .cover{width:100%;height:260px;border-radius:14px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:64px;margin:0 0 24px}
.article-body h2{font-size:22px;margin:32px 0 14px;padding-left:14px;border-left:4px solid var(--cyan);line-height:1.4}
.article-body h3{font-size:17px;margin:22px 0 10px}
.article-body p{margin-bottom:16px;color:#cbd5e6}
.article-body img{width:100%;border-radius:12px;margin:18px 0}
.article-body figcaption{color:var(--faint);font-size:12.5px;text-align:center;margin:-10px 0 20px}
.article-body table{width:100%;border-collapse:collapse;margin:20px 0;font-size:14px}
.article-body th,.article-body td{border:1px solid var(--border2);padding:11px 14px;text-align:left}
.article-body th{background:var(--surface2);color:var(--text)}
.article-body td{color:var(--muted)}
.article-body ul,.article-body ol{margin:0 0 16px 22px}
.article-body li{margin-bottom:8px;color:#cbd5e6}
.article-body blockquote{border-left:4px solid var(--teal);background:var(--grad-soft);padding:16px 20px;border-radius:0 10px 10px 0;margin:20px 0;color:var(--muted);font-style:italic}
.article-body a{color:var(--cyan);text-decoration:underline}
.article-toc{background:var(--surface2);border:1px solid var(--border);border-radius:12px;padding:18px 22px;margin:24px 0}
.article-toc h4{font-size:14px;color:var(--cyan);margin-bottom:10px}
.article-toc a{display:block;color:var(--muted);font-size:14px;margin-bottom:7px}
.article-toc a:hover{color:var(--cyan)}
.article-nav{display:flex;justify-content:space-between;gap:14px;margin-top:32px;flex-wrap:wrap}
.article-nav a{flex:1;min-width:200px;background:var(--surface2);border:1px solid var(--border);border-radius:12px;padding:14px 18px;font-size:13.5px;color:var(--muted)}
.article-nav a:hover{border-color:var(--cyan);color:var(--cyan)}
.article-nav a span{display:block;font-size:11px;color:var(--faint);margin-bottom:4px}
.back-link{display:inline-block;margin-bottom:18px;color:var(--cyan);font-weight:600;font-size:14px}

/* 评论区 */
.comments{margin-top:32px}
.comment{background:var(--surface2);border:1px solid var(--border);border-radius:12px;padding:16px 18px;margin-bottom:12px}
.comment .who{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.comment .who b{font-size:13.5px}
.comment .who .stars{color:#fbbf24;font-size:12px;margin-left:6px}
.comment p{color:var(--muted);font-size:14px}

/* 侧栏 */
.sidebar .side-box{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px;margin-bottom:20px}
.sidebar .side-box h4{font-size:15px;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--border)}
.sidebar .side-box a{display:block;color:var(--muted);font-size:13.5px;margin-bottom:10px;line-height:1.5}
.sidebar .side-box a:hover{color:var(--cyan)}
.sidebar .side-box .cat{display:inline-block;font-size:12px;color:var(--green);border:1px solid rgba(52,211,153,.3);padding:2px 10px;border-radius:999px;margin:0 6px 6px 0}

/* 404 */
.page-404{text-align:center;padding:120px 0;min-height:60vh;display:flex;flex-direction:column;align-items:center;justify-content:center}
.page-404 .code{font-size:120px;font-weight:900;line-height:1;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.page-404 h1{font-size:26px;margin:16px 0 10px}
.page-404 p{color:var(--muted);margin-bottom:28px}

/* 响应式 */
@media(max-width:960px){
  .hero-grid,.article-layout{grid-template-columns:1fr}
  .nav-links{display:none}
  .cards,.scenes,.reviews,.news-grid{grid-template-columns:1fr 1fr}
  .dl-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section-title{font-size:28px}
  .hero h1{font-size:34px}
}
@media(max-width:560px){
  .cards,.scenes,.reviews,.news-grid,.dl-grid{grid-template-columns:1fr}
  .hero-stats{gap:18px}
}