/* ============================================================
   iKuuu - 官方站点全局样式
   配色母题: 深空海军蓝 + 电光青 + 翡翠绿 (原创方案)
   ============================================================ */
:root{
  --navy:#0a1128;
  --navy-2:#0f1b3d;
  --navy-3:#16244f;
  --cyan:#22d3ee;
  --blue:#4f7dff;
  --green:#34d399;
  --green-dark:#10b981;
  --ink:#1f2937;
  --ink-2:#4b5563;
  --muted:#6b7280;
  --line:#e5e9f2;
  --bg:#f7f9fc;
  --bg-2:#eef2f9;
  --white:#ffffff;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 10px 30px rgba(10,17,40,.08);
  --shadow-lg:0 20px 50px rgba(10,17,40,.16);
  --font:"Inter","PingFang SC","Microsoft YaHei","Segoe UI",-apple-system,BlinkMacSystemFont,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);background:var(--white);line-height:1.7;font-size:16px}
a{color:var(--blue);text-decoration:none;transition:color .2s,background .2s,border .2s,transform .2s}
a:hover{color:var(--green-dark)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style-position:inside}
h1,h2,h3,h4{line-height:1.3;color:var(--navy);font-weight:700}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section.alt{background:var(--bg)}
.section-title{font-size:32px;margin-bottom:12px;text-align:center}
.section-sub{font-size:17px;color:var(--muted);text-align:center;max-width:720px;margin:0 auto 44px}
.badge{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--blue);background:rgba(79,125,255,.1);border:1px solid rgba(79,125,255,.25);padding:4px 12px;border-radius:999px;margin-bottom:16px}
.center{text-align:center}

/* ---------- 顶部公告条 ---------- */
.topbar{background:linear-gradient(90deg,#4f7dff,#22d3ee);color:#fff;font-size:14px;text-align:center;padding:9px 16px}
.topbar a{color:#fff;font-weight:600;text-decoration:underline}

/* ---------- 头部导航 ---------- */
.header{position:sticky;top:0;z-index:100;background:rgba(10,17,40,.96);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:20px}
.logo img{width:34px;height:34px;border-radius:8px}
.logo span b{color:var(--cyan)}
.nav{display:flex;align-items:center;gap:6px}
.nav a{color:#cbd5e1;font-size:15px;padding:8px 13px;border-radius:8px;font-weight:500}
.nav a:hover,.nav a.active{color:#fff;background:rgba(255,255,255,.1)}
.nav .cta{margin-left:8px;color:#06281f;background:linear-gradient(90deg,#34d399,#10b981);font-weight:700;padding:9px 18px;border-radius:999px}
.nav .cta:hover{color:#06281f;filter:brightness(1.06)}
.menu-toggle{display:none}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;border-radius:999px;padding:13px 28px;font-size:16px;border:0;cursor:pointer}
.btn-green{background:linear-gradient(90deg,#34d399,#10b981);color:#06281f}
.btn-green:hover{color:#06281f;filter:brightness(1.06);transform:translateY(-1px)}
.btn-blue{background:linear-gradient(90deg,#4f7dff,#2563eb);color:#fff}
.btn-blue:hover{color:#fff;filter:brightness(1.06);transform:translateY(-1px)}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--ink)}
.btn-ghost:hover{color:var(--blue);border-color:var(--blue)}
.btn-lg{padding:16px 34px;font-size:17px}
.btn-sm{padding:9px 18px;font-size:14px}

/* ---------- Hero ---------- */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(34,211,238,.25),transparent 60%),radial-gradient(900px 500px at 10% 110%,rgba(79,125,255,.28),transparent 60%),linear-gradient(180deg,#0a1128,#0f1b3d);color:#e2e8f0;padding:64px 0;overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{color:#fff;font-size:44px;line-height:1.15;margin:14px 0 18px}
.hero h1 .hl{background:linear-gradient(90deg,#22d3ee,#34d399);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:18px;color:#b7c3d9;max-width:540px;margin-bottom:26px}
.hero-meta{display:flex;gap:28px;flex-wrap:wrap;margin-bottom:28px}
.hero-meta div{text-align:left}
.hero-meta strong{display:block;font-size:26px;color:#fff}
.hero-meta span{font-size:13px;color:#8ea0c0}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-trust{display:flex;gap:22px;margin-top:26px;color:#8ea0c0;font-size:13px;flex-wrap:wrap}

/* ---------- 客户端模拟器 ---------- */
.simulator{background:#0d1633;border:1px solid rgba(255,255,255,.1);border-radius:18px;box-shadow:var(--shadow-lg);overflow:hidden;position:relative}
.sim-head{display:flex;align-items:center;gap:8px;padding:12px 16px;background:#101c3f;border-bottom:1px solid rgba(255,255,255,.08)}
.sim-dot{width:12px;height:12px;border-radius:50%}
.sim-dot.r{background:#f87171}.sim-dot.y{background:#fbbf24}.sim-dot.g{background:#34d399}
.sim-title{color:#93a4c8;font-size:13px;margin-left:8px}
.sim-body{padding:18px}
.sim-connect{display:flex;align-items:center;justify-content:space-between;background:#0a1128;border-radius:12px;padding:16px;margin-bottom:14px}
.sim-connect .loc{display:flex;align-items:center;gap:10px;color:#fff;font-weight:600}
.sim-connect .loc .flag{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,#4f7dff,#22d3ee);display:flex;align-items:center;justify-content:center;font-size:15px}
.sim-btn{background:linear-gradient(90deg,#34d399,#10b981);color:#06281f;font-weight:700;padding:9px 18px;border-radius:999px;font-size:14px;cursor:pointer}
.sim-btn.off{background:#334155;color:#cbd5e1}
.sim-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}
.sim-stat{background:#101c3f;border-radius:10px;padding:12px;text-align:center}
.sim-stat .num{font-size:20px;font-weight:800;color:var(--cyan)}
.sim-stat .lbl{font-size:11px;color:#8ea0c0}
.sim-chart{background:#0a1128;border-radius:12px;padding:14px;height:120px;display:flex;align-items:flex-end;gap:5px}
.sim-chart span{flex:1;background:linear-gradient(180deg,#22d3ee,#4f7dff);border-radius:4px 4px 0 0;opacity:.85}
.sim-nodes{display:flex;justify-content:space-between;margin-top:12px;font-size:12px;color:#8ea0c0}

/* ---------- 节点速度 ---------- */
.speed-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.speed-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center;box-shadow:var(--shadow);transition:transform .2s}
.speed-card:hover{transform:translateY(-4px)}
.speed-card .country{font-size:26px;margin-bottom:8px}
.speed-card h4{font-size:17px;margin-bottom:4px}
.speed-card .ms{font-size:28px;font-weight:800;color:var(--green-dark)}
.speed-card .bar{height:6px;background:var(--bg-2);border-radius:3px;margin:12px 0;overflow:hidden}
.speed-card .bar i{display:block;height:100%;background:linear-gradient(90deg,#22d3ee,#34d399);border-radius:3px}

/* ---------- 核心功能 ---------- */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:transform .2s}
.feature-card:hover{transform:translateY(-5px);border-color:var(--blue)}
.feature-icon{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,rgba(79,125,255,.15),rgba(34,211,238,.15));display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.feature-card h3{font-size:19px;margin-bottom:10px}
.feature-card p{color:var(--ink-2);font-size:15px}

/* ---------- 对比表 ---------- */
.compare-wrap{overflow-x:auto;background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--line)}
table.compare{width:100%;border-collapse:collapse;min-width:640px}
.compare th,.compare td{padding:16px 18px;text-align:center;border-bottom:1px solid var(--line);font-size:15px}
.compare th:first-child,.compare td:first-child{text-align:left}
.compare thead th{background:var(--navy);color:#fff;font-weight:700}
.compare thead th.hl{background:linear-gradient(90deg,#4f7dff,#22d3ee);color:#06281f}
.compare tbody tr:hover{background:var(--bg)}
.compare .yes{color:var(--green-dark);font-weight:700}
.compare .no{color:#94a3b8}
.compare .me{background:rgba(52,211,153,.06)}

/* ---------- 下载区 ---------- */
.dl-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.dl-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow);transition:transform .2s}
.dl-card:hover{transform:translateY(-5px)}
.dl-card .os{font-size:38px;margin-bottom:10px}
.dl-card h4{font-size:17px;margin-bottom:6px}
.dl-card p{font-size:13px;color:var(--muted);margin-bottom:14px}
.dl-card .btn{width:100%}

/* ---------- 应用场景 ---------- */
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.scene-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line)}
.scene-card .scene-img{height:150px;background:linear-gradient(135deg,#4f7dff,#22d3ee);display:flex;align-items:center;justify-content:center;font-size:44px}
.scene-card .scene-body{padding:22px}
.scene-card h3{font-size:18px;margin-bottom:8px}
.scene-card p{font-size:14px;color:var(--ink-2)}

/* ---------- FAQ ---------- */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:14px;overflow:hidden}
.faq-item summary{padding:18px 22px;font-weight:700;font-size:16px;cursor:pointer;color:var(--navy);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(--blue);font-weight:400}
.faq-item[open] summary::after{content:"–"}
.faq-item .faq-answer{padding:0 22px 20px;color:var(--ink-2);font-size:15px}
.faq-answer ol{padding-left:20px}
.faq-answer ol li{margin-bottom:8px}
.faq-cat{font-size:13px;color:var(--blue);font-weight:700;text-transform:uppercase;letter-spacing:.5px}

/* ---------- 用户评论 ---------- */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.review-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.review-card .stars{color:#f59e0b;letter-spacing:2px;margin-bottom:12px}
.review-card p{font-size:15px;color:var(--ink-2);margin-bottom:16px}
.review-card .who{display:flex;align-items:center;gap:10px}
.review-card .ava{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,#4f7dff,#22d3ee);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.review-card .who b{display:block;font-size:14px}
.review-card .who span{font-size:12px;color:var(--muted)}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .2s;display:flex;flex-direction:column}
.news-card:hover{transform:translateY(-5px)}
.news-card img{height:160px;width:100%;object-fit:cover}
.news-card .news-body{padding:20px;display:flex;flex-direction:column;flex:1}
.news-card .news-cat{font-size:12px;color:var(--blue);font-weight:700;text-transform:uppercase;letter-spacing:.5px}
.news-card h3{font-size:17px;margin:8px 0;line-height:1.4}
.news-card h3 a{color:var(--navy)}
.news-card h3 a:hover{color:var(--blue)}
.news-card .news-date{font-size:12px;color:var(--muted);margin-top:auto}
.news-tabs{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:36px}
.news-tabs a{padding:9px 20px;border-radius:999px;border:1px solid var(--line);font-size:14px;font-weight:600;color:var(--ink-2)}
.news-tabs a:hover,.news-tabs a.active{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ---------- 底部CTA + 页脚 ---------- */
.cta-band{background:radial-gradient(900px 400px at 50% 0,rgba(34,211,238,.25),transparent 60%),linear-gradient(135deg,#0a1128,#16244f);color:#e2e8f0;padding:72px 0;text-align:center}
.cta-band h2{color:#fff;font-size:34px;margin-bottom:14px}
.cta-band p{color:#b7c3d9;max-width:640px;margin:0 auto 28px}
.footer{background:#070d20;color:#8ea0c0;padding:56px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer a{display:block;color:#8ea0c0;font-size:14px;margin-bottom:10px}
.footer a:hover{color:var(--cyan)}
.footer .logo{color:#fff;margin-bottom:12px}
.footer .about{font-size:14px;max-width:300px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:22px;text-align:center;font-size:13px}
.footer-sitemap-link{display:inline-block;color:#8ea0c0;font-size:13px;margin-top:8px}

/* ---------- 面包屑 ---------- */
.breadcrumb{background:var(--bg);border-bottom:1px solid var(--line);padding:14px 0;font-size:14px}
.breadcrumb ol{list-style:none;display:flex;gap:8px;flex-wrap:wrap}
.breadcrumb li+li::before{content:"›";margin-right:8px;color:var(--muted)}
.breadcrumb a{color:var(--ink-2)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb .current{color:var(--ink);font-weight:600}

/* ---------- 内页通用 ---------- */
.page-hero{background:linear-gradient(180deg,#0a1128,#0f1b3d);color:#e2e8f0;padding:56px 0;text-align:center}
.page-hero h1{color:#fff;font-size:38px;margin-bottom:12px}
.page-hero p{color:#b7c3d9;max-width:680px;margin:0 auto}
.content-section{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow);margin-bottom:28px}
.content-section h2{font-size:24px;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--bg-2)}
.content-section h3{font-size:19px;margin:22px 0 10px}
.content-section p{color:var(--ink-2);margin-bottom:14px}
.content-section ul,.content-section ol{padding-left:22px;margin-bottom:14px;color:var(--ink-2)}
.content-section li{margin-bottom:8px}
.step-box{display:flex;gap:14px;margin-bottom:14px;align-items:flex-start}
.step-num{flex-shrink:0;width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,#4f7dff,#22d3ee);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:14px}
.step-box b{display:block;color:var(--navy);margin-bottom:2px}
.step-box span{color:var(--ink-2);font-size:15px}

/* ---------- 文章页 ---------- */
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:36px;align-items:start}
.article-main{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow)}
.article-main h1{font-size:30px;line-height:1.35;margin:10px 0 16px}
.article-meta{display:flex;gap:18px;color:var(--muted);font-size:14px;flex-wrap:wrap;margin-bottom:22px}
.article-hero{border-radius:var(--radius-sm);margin:0 0 26px;overflow:hidden}
.article-hero img{width:100%;height:auto}
.article-main .lead{font-size:18px;color:var(--ink);font-weight:500;border-left:4px solid var(--blue);padding-left:16px;margin-bottom:24px}
.article-main h2{font-size:23px;margin:32px 0 14px;padding-bottom:10px;border-bottom:2px solid var(--bg-2)}
.article-main h3{font-size:19px;margin:24px 0 10px}
.article-main p{margin-bottom:16px;color:var(--ink-2)}
.article-main .inline-img{margin:20px 0;border-radius:var(--radius-sm);overflow:hidden}
.article-main .inline-img img{width:100%}
.article-main .inline-img .cap{font-size:12px;color:var(--muted);padding:8px 4px 0}
.article-main table{width:100%;border-collapse:collapse;margin:20px 0;font-size:14px}
.article-main table th{background:var(--navy);color:#fff;padding:10px 12px;text-align:left}
.article-main table td{padding:10px 12px;border-bottom:1px solid var(--line)}
.article-main table tr:nth-child(even){background:var(--bg)}
.toc{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 22px;margin-bottom:28px}
.toc h4{font-size:15px;margin-bottom:10px}
.toc ol{padding-left:20px}
.toc li{margin-bottom:6px;font-size:14px}
.article-comments{margin-top:40px}
.comment{display:flex;gap:12px;padding:16px 0;border-bottom:1px solid var(--line)}
.comment .ava{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#4f7dff,#22d3ee);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}
.comment b{display:block;font-size:14px}
.comment .c-date{font-size:12px;color:var(--muted)}
.comment p{font-size:14px;color:var(--ink-2);margin-top:4px}
.article-nav{display:flex;justify-content:space-between;gap:16px;margin-top:32px;padding-top:22px;border-top:1px solid var(--line)}
.article-nav a{font-size:14px}
.sidebar{position:sticky;top:88px}
.side-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin-bottom:22px}
.side-card h4{font-size:16px;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--bg-2)}
.side-card ul{list-style:none}
.side-card li{margin-bottom:12px;font-size:14px}
.side-card li a{color:var(--ink-2)}
.side-card li a:hover{color:var(--blue)}
.side-card .cat-list a{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px dashed var(--line);font-size:14px;color:var(--ink-2)}
.side-card .cat-list a span{color:var(--muted);font-size:12px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}

/* ---------- Sitemap ---------- */
.sitemap-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.sitemap-col h3{font-size:18px;margin-bottom:14px;color:var(--blue)}
.sitemap-col ul{list-style:none}
.sitemap-col li{margin-bottom:10px;font-size:15px}
.sitemap-col li a{color:var(--ink-2)}
.sitemap-col li a:hover{color:var(--blue)}

/* ---------- 404 ---------- */
.err-wrap{text-align:center;padding:100px 20px}
.err-wrap .code{font-size:120px;font-weight:900;background:linear-gradient(90deg,#4f7dff,#22d3ee);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.err-wrap h1{font-size:28px;margin:16px 0}
.err-wrap p{color:var(--muted);margin-bottom:28px}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .hero-inner{grid-template-columns:1fr}
  .speed-grid{grid-template-columns:repeat(2,1fr)}
  .dl-grid{grid-template-columns:repeat(3,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .article-layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .sitemap-cols{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .section{padding:48px 0}
  .section-title{font-size:26px}
  .hero h1{font-size:30px}
  .nav{display:none}
  .menu-toggle{display:block;color:#fff;font-size:24px;background:none;border:0}
  .speed-grid,.features-grid,.news-grid,.reviews-grid,.scene-grid,.dl-grid{grid-template-columns:1fr}
  .sitemap-cols,.footer-grid{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
  .article-main{padding:22px}
  .hero-meta{justify-content:space-between}
}