/* iKuuu VPN 品牌官网全局样式 - 深空蓝+电光青主题 */
:root{
  --bg:#0b1026;--bg2:#0e1434;--bg3:#131a3d;--card:#151c40;
  --line:#26305c;--line2:#33407a;
  --cyan:#00e5d0;--cyan2:#06b8a6;--violet:#7c5cff;--violet2:#5b42e0;
  --orange:#ff7a45;--orange2:#f25c2a;
  --txt:#eaf0ff;--txt2:#a8b2d0;--txt3:#7883a8;
  --grad:linear-gradient(135deg,#00e5d0 0%,#7c5cff 100%);
  --shadow:0 12px 40px rgba(0,0,0,.45);
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--txt);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,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:72px 0}
.section-head{text-align:center;margin-bottom:48px}
.section-head .tag{display:inline-block;font-size:13px;font-weight:600;color:var(--cyan);letter-spacing:2px;text-transform:uppercase;background:rgba(0,229,208,.1);border:1px solid rgba(0,229,208,.25);padding:6px 16px;border-radius:30px;margin-bottom:16px}
.section-head h2{font-size:34px;line-height:1.3;font-weight:800;margin-bottom:14px}
.section-head h2 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.section-head p{color:var(--txt2);font-size:16px;max-width:680px;margin:0 auto}

/* 导航 */
.topbar{position:sticky;top:0;z-index:100;background:rgba(11,16,38,.85);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.nav .brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800}
.nav .brand img{width:34px;height:34px;border-radius:8px}
.nav .brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{font-size:15px;color:var(--txt2);font-weight:500;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--txt)}
.nav-links a.active::after{content:"";position:absolute;left:0;bottom:-6px;width:100%;height:2px;background:var(--grad);border-radius:2px}
.nav-cta{background:var(--grad);color:#04121a;font-weight:700;padding:10px 22px;border-radius:30px;font-size:14px}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,229,208,.35)}

/* Hero */
.hero{padding:60px 0 40px;background:radial-gradient(1200px 500px at 70% -10%,rgba(124,92,255,.25),transparent),radial-gradient(900px 400px at 10% 0%,rgba(0,229,208,.15),transparent)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:44px;line-height:1.25;font-weight:900;margin:18px 0}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .sub{color:var(--txt2);font-size:17px;max-width:540px;margin-bottom:28px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 30px;border-radius:32px;font-weight:700;font-size:15px}
.btn-primary{background:var(--grad);color:#04121a;box-shadow:0 10px 28px rgba(0,229,208,.3)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(0,229,208,.4)}
.btn-ghost{background:transparent;border:1px solid var(--line2);color:var(--txt)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.hero-stats{display:flex;gap:36px;margin-top:36px;flex-wrap:wrap}
.hero-stats .st b{font-size:28px;font-weight:800;display:block;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-stats .st span{font-size:13px;color:var(--txt3)}

/* 客户端模拟器 */
.simulator{background:linear-gradient(180deg,#1a2150,#0f1535);border:1px solid var(--line2);border-radius:20px;box-shadow:var(--shadow);overflow:hidden;max-width:440px;margin:0 auto}
.sim-top{display:flex;align-items:center;gap:8px;padding:14px 18px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.02)}
.sim-top .dot{width:12px;height:12px;border-radius:50%}
.sim-top .dot:nth-child(1){background:#ff5f57}.sim-top .dot:nth-child(2){background:#febc2e}.sim-top .dot:nth-child(3){background:#28c840}
.sim-top .title{margin-left:auto;font-size:13px;color:var(--txt3)}
.sim-body{padding:20px}
.sim-connect{text-align:center;padding:10px 0 16px}
.sim-connect .ring{width:120px;height:120px;border-radius:50%;margin:0 auto 14px;display:flex;align-items:center;justify-content:center;background:conic-gradient(var(--cyan),var(--violet),var(--cyan));animation:spin 3s linear infinite}
.sim-connect .ring::before{content:"";width:104px;height:104px;border-radius:50%;background:var(--bg2);position:absolute}
.sim-connect .ring b{position:relative;font-size:22px;font-weight:800}
@keyframes spin{to{transform:rotate(360deg)}}
.sim-connect .status{font-size:14px;color:var(--cyan);font-weight:600}
.sim-connect .ip{font-size:12px;color:var(--txt3);margin-top:4px}
.sim-row{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;background:var(--bg2);border:1px solid var(--line);border-radius:12px;margin-bottom:10px}
.sim-row .l{display:flex;align-items:center;gap:10px;font-size:14px}
.sim-row .l .flag{width:26px;height:18px;border-radius:4px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:11px}
.sim-row .r{font-size:13px;color:var(--txt2)}
.sim-row.on{border-color:rgba(0,229,208,.5)}
.sim-row.on .r{color:var(--cyan)}
.sim-btn{display:block;text-align:center;background:var(--grad);color:#04121a;font-weight:700;padding:13px;border-radius:12px;margin-top:6px}

/* 公告区 */
.notice{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.notice-inner{display:flex;align-items:center;gap:14px;padding:14px 0}
.notice-inner .badge{background:var(--orange);color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:20px;white-space:nowrap}
.notice-inner p{font-size:14px;color:var(--txt2)}

/* 卡片网格 */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.3s}
.card:hover{transform:translateY(-6px);border-color:var(--cyan);box-shadow:var(--shadow)}
.card .icon{width:54px;height:54px;border-radius:14px;background:rgba(0,229,208,.12);display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:24px}
.card h3{font-size:19px;margin-bottom:10px;font-weight:700}
.card p{color:var(--txt2);font-size:14.5px}
.card .num{font-size:13px;font-weight:800;color:var(--cyan);letter-spacing:1px}

/* 对比表 */
.compare{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line)}
.compare table{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:14.5px}
.compare th{background:var(--bg2);font-size:14px;color:var(--txt2)}
.compare th.hl,.compare td.hl{background:rgba(0,229,208,.06);color:var(--cyan);font-weight:700}
.compare td:first-child,.compare th:first-child{text-align:left}
.compare .yes{color:var(--cyan);font-weight:700}
.compare .no{color:var(--txt3)}

/* 新闻 Tab */
.tabs{display:flex;gap:10px;justify-content:center;margin-bottom:32px;flex-wrap:wrap}
.tabs a{padding:10px 22px;border-radius:30px;background:var(--bg2);border:1px solid var(--line);font-size:14px;color:var(--txt2);font-weight:600}
.tabs a.on{background:var(--grad);color:#04121a;border-color:transparent}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s}
.news-card:hover{transform:translateY(-6px);border-color:var(--cyan)}
.news-card img{width:100%;height:170px;object-fit:cover}
.news-card .body{padding:20px}
.news-card .meta{font-size:12px;color:var(--txt3);margin-bottom:8px}
.news-card h4{font-size:16px;line-height:1.5;margin-bottom:10px}
.news-card h4 a:hover{color:var(--cyan)}

/* 评论 */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.review .stars{color:#ffc107;font-size:15px;letter-spacing:2px;margin-bottom:12px}
.review p{color:var(--txt2);font-size:14.5px;margin-bottom:16px}
.review .user{display:flex;align-items:center;gap:12px}
.review .avatar{width:42px;height:42px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;font-weight:800;color:#04121a;font-size:16px}
.review .user b{font-size:14px;display:block}
.review .user span{font-size:12px;color:var(--txt3)}

/* 下载区 */
.download-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.dl-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 18px;text-align:center;transition:.3s}
.dl-card:hover{transform:translateY(-6px);border-color:var(--cyan)}
.dl-card .os{font-size:34px;margin-bottom:12px}
.dl-card h4{font-size:16px;margin-bottom:6px}
.dl-card span{font-size:12px;color:var(--txt3);display:block;margin-bottom:16px}
.dl-card a.btn{justify-content:center;padding:10px 20px;font-size:13px}

/* 信任背书 */
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.trust-item{text-align:center;padding:28px 16px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.trust-item .ic{font-size:30px;margin-bottom:12px}
.trust-item b{font-size:16px;display:block;margin-bottom:6px}
.trust-item span{font-size:13px;color:var(--txt3)}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:16px;overflow:hidden}
.faq-item .q{padding:20px 24px;font-weight:700;font-size:16px;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item .q .qnum{color:var(--cyan);font-weight:800;font-size:14px;flex-shrink:0}
.faq-item .a{padding:0 24px 22px;color:var(--txt2);font-size:14.5px}
.faq-item .a ol{margin:12px 0 0 4px}
.faq-item .a ol li{padding:8px 0;border-top:1px dashed var(--line);padding-left:26px;position:relative}
.faq-item .a ol li::before{content:counter(step);counter-increment:step;position:absolute;left:0;top:8px;width:20px;height:20px;border-radius:50%;background:rgba(0,229,208,.15);color:var(--cyan);font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center}
.faq-item .a ol{counter-reset:step}

/* CTA */
.cta{text-align:center;padding:80px 24px;background:radial-gradient(700px 300px at 50% 0%,rgba(124,92,255,.25),transparent);border-radius:24px;border:1px solid var(--line2);margin-bottom:72px}
.cta h2{font-size:36px;font-weight:900;margin-bottom:16px}
.cta p{color:var(--txt2);margin-bottom:30px;max-width:560px;margin-left:auto;margin-right:auto}
.cta .btn-primary{font-size:17px;padding:16px 40px}

/* 页脚 */
.footer{background:var(--bg2);border-top:1px solid var(--line);padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:36px;padding-bottom:40px}
.footer h4{font-size:16px;margin-bottom:18px}
.footer .links a{display:block;color:var(--txt2);font-size:14px;margin-bottom:10px}
.footer .links a:hover{color:var(--cyan)}
.footer .fdesc{color:var(--txt3);font-size:13.5px;margin-top:14px;max-width:320px}
.footer-bottom{border-top:1px solid var(--line);padding:22px 0;text-align:center;font-size:13px;color:var(--txt3)}
.footer-bottom a{color:var(--txt2)}
.friend-links{display:flex;flex-wrap:wrap;gap:12px 22px;justify-content:center;padding:18px 0;border-top:1px solid var(--line);font-size:13px}
.friend-links a{color:var(--txt3)}
.friend-links a:hover{color:var(--cyan)}

/* 面包屑 */
.crumb{font-size:13px;color:var(--txt3);padding:20px 0 8px}
.crumb a{color:var(--txt2)}
.crumb a:hover{color:var(--cyan)}
.crumb span{margin:0 8px}

/* 文章页 */
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:40px;padding:24px 0 64px}
.article-main h1{font-size:30px;line-height:1.4;margin:16px 0;font-weight:800}
.article-main .ameta{font-size:13px;color:var(--txt3);display:flex;gap:20px;flex-wrap:wrap;padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:24px}
.article-main h2{font-size:22px;margin:32px 0 14px;padding-left:14px;border-left:4px solid var(--cyan);font-weight:700}
.article-main p{color:#cfd6ea;font-size:15.5px;margin-bottom:16px}
.article-main img{border-radius:12px;margin:16px 0}
.article-main table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.article-main table th,.article-main table td{border:1px solid var(--line);padding:12px 14px;text-align:left}
.article-main table th{background:var(--bg2);color:var(--cyan)}
.article-main blockquote{border-left:3px solid var(--violet);background:var(--bg2);padding:16px 20px;margin:18px 0;border-radius:0 10px 10px 0;color:var(--txt2)}
.article-main .toc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin-bottom:28px}
.article-main .toc b{font-size:15px;display:block;margin-bottom:10px}
.article-main .toc a{display:block;color:var(--txt2);font-size:14px;padding:5px 0}
.article-main .toc a:hover{color:var(--cyan)}
.article-comments{margin-top:40px}
.article-comments .rev{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:12px}
.article-comments .rev b{font-size:14px}
.article-comments .rev p{font-size:14px;color:var(--txt2);margin:6px 0 0}
.sidebar{position:sticky;top:88px;align-self:start}
.side-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:20px}
.side-card h3{font-size:16px;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.side-card .hot a{display:flex;gap:10px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:13.5px;color:var(--txt2)}
.side-card .hot a:hover{color:var(--cyan)}
.side-card .hot .n{color:var(--cyan);font-weight:800;font-size:14px}
.side-card .cat a{display:block;padding:8px 0;color:var(--txt2);font-size:14px;border-bottom:1px dashed var(--line)}
.side-card .cat a:hover{color:var(--cyan)}
.prev-next{display:flex;justify-content:space-between;gap:16px;margin-top:32px;padding-top:24px;border-top:1px solid var(--line)}
.prev-next a{font-size:14px;color:var(--txt2);max-width:45%}
.prev-next a:hover{color:var(--cyan)}
.back-list{display:inline-block;margin-top:20px;font-size:14px;color:var(--cyan)}

/* 新闻列表页 */
.news-list{display:grid;grid-template-columns:1fr;gap:24px}
.news-list-item{display:flex;gap:24px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:.3s}
.news-list-item:hover{border-color:var(--cyan)}
.news-list-item img{width:260px;height:160px;object-fit:cover;border-radius:10px;flex-shrink:0}
.news-list-item .cat{font-size:12px;color:var(--cyan);font-weight:600}
.news-list-item h3{font-size:19px;margin:8px 0}
.news-list-item h3 a:hover{color:var(--cyan)}
.news-list-item p{color:var(--txt2);font-size:14px}
.news-list-item .meta{font-size:12px;color:var(--txt3);margin-top:10px}

/* 404 */
.err404{text-align:center;padding:120px 24px}
.err404 .code{font-size:120px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1}
.err404 h1{font-size:28px;margin:20px 0 12px}
.err404 p{color:var(--txt2);margin-bottom:30px}

/* 场景 */
.scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.scene-card{display:flex;gap:18px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.scene-card .ic{font-size:34px;flex-shrink:0}
.scene-card h3{font-size:18px;margin-bottom:8px}
.scene-card p{color:var(--txt2);font-size:14.5px}

/* 响应式 */
@media(max-width:992px){
  .hero-grid,.article-layout{grid-template-columns:1fr}
  .grid-3,.grid-2,.grid-4,.reviews,.news-grid,.download-grid,.trust{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
  .hero h1{font-size:34px}
  .news-list-item{flex-direction:column}
  .news-list-item img{width:100%;height:200px}
}
@media(max-width:600px){
  .grid-3,.grid-2,.grid-4,.reviews,.news-grid,.download-grid,.trust,.scene-grid{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .section-head h2{font-size:26px}
  .download-grid{grid-template-columns:repeat(2,1fr)}
}