/* ================== 快连官网 全局样式 ================== */
:root{
  --primary:#0B2A4A;
  --primary-2:#13456F;
  --accent:#00C2C7;
  --accent-2:#19E0D2;
  --warn:#FF7A45;
  --bg:#F5F7FB;
  --card:#FFFFFF;
  --text:#1A2330;
  --text-2:#5B6675;
  --line:#E6EAF0;
  --radius:10px;
  --shadow:0 6px 24px rgba(11,42,74,0.08);
  --shadow-hover:0 12px 36px rgba(11,42,74,0.14);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--bg);color:var(--text);font-family:"PingFang SC","Microsoft YaHei","Source Han Sans",Inter,Arial,sans-serif;line-height:1.7;font-size:15px}
a{color:var(--primary-2);text-decoration:none;transition:color .15s}
a:hover{color:var(--accent)}
img{max-width:100%;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4{color:var(--primary);font-weight:700;line-height:1.35}
h1{font-size:28px;margin-bottom:14px}
h2{font-size:22px;margin:24px 0 12px}
h3{font-size:17px;margin:18px 0 8px}
.container{max-width:1200px;margin:0 auto;padding:0 16px}
.skip-link{position:absolute;left:-9999px;top:0;background:#000;color:#fff;padding:8px 14px;z-index:9999}
.skip-link:focus{left:8px;top:8px}

/* ===== 顶部条 ===== */
.topbar{background:#0B1F33;color:#cfe1f3;font-size:12.5px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:34px}
.topbar a{color:#cfe1f3;margin:0 6px}
.topbar a:hover{color:#fff}

/* ===== Header ===== */
.site-header{background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
.site-header .container{display:flex;align-items:center;gap:24px;padding:14px 16px}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{width:42px;height:42px;border-radius:10px;background:linear-gradient(135deg,#0B2A4A 0%,#00C2C7 100%);position:relative;flex-shrink:0;box-shadow:0 4px 14px rgba(0,194,199,.35)}
.brand-logo::after{content:"";position:absolute;left:50%;top:50%;width:14px;height:14px;border:2.5px solid #fff;border-radius:50%;transform:translate(-50%,-50%)}
.brand-logo::before{content:"";position:absolute;left:50%;top:50%;width:6px;height:6px;background:#fff;border-radius:50%;transform:translate(-50%,-50%)}
.brand-text{display:flex;flex-direction:column}
.brand-text strong{color:var(--primary);font-size:20px;letter-spacing:.5px}
.brand-text small{color:var(--text-2);font-size:11.5px}

.search-box{flex:1;display:flex;max-width:520px;margin-left:auto}
.search-box input{flex:1;padding:10px 14px;border:1.5px solid var(--line);border-right:none;border-radius:8px 0 0 8px;outline:none;font-size:14px}
.search-box input:focus{border-color:var(--accent)}
.search-box button{padding:10px 22px;background:var(--primary);color:#fff;border:none;border-radius:0 8px 8px 0;cursor:pointer;font-weight:600}
.search-box button:hover{background:var(--primary-2)}
.hot-tags{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.hot-tags span{color:var(--text-2);font-size:12px}
.hot-tags a{padding:3px 10px;background:#F0F4F9;border-radius:14px;font-size:12.5px;color:var(--primary-2)}
.hot-tags a:hover{background:var(--accent);color:#fff}

/* ===== 主导航 ===== */
.mainnav{background:#fff;border-bottom:1px solid var(--line)}
.mainnav .container{display:flex;align-items:center;gap:6px;height:48px}
.mainnav a{position:relative;padding:0 18px;height:48px;line-height:48px;color:var(--text);font-weight:600;font-size:15px}
.mainnav a:hover{color:var(--accent)}
.mainnav a.active{color:var(--primary)}
.mainnav a.active::after{content:"";position:absolute;left:18px;right:18px;bottom:0;height:3px;background:var(--accent);border-radius:2px}

/* ===== 头部下方 tab 头条 ===== */
.headline-bar{background:#fff;border-bottom:1px solid var(--line)}
.headline-bar .container{display:flex;gap:28px;align-items:center;padding:10px 16px}
.headline-bar .tab{display:flex;gap:14px}
.headline-bar .tab a{padding:6px 14px;border-radius:16px;font-size:13px;color:var(--text-2)}
.headline-bar .tab a.active{background:var(--primary);color:#fff}
.headline-bar .links{flex:1;display:flex;gap:14px;flex-wrap:wrap;justify-content:flex-end}
.headline-bar .links a{color:var(--text);font-size:13px}

/* ===== Hero ===== */
.hero{margin:18px 0;background:linear-gradient(120deg,#0B2A4A 0%,#13456F 60%,#0E6077 100%);color:#fff;border-radius:var(--radius);padding:36px 40px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;background:radial-gradient(circle,rgba(0,194,199,.4),transparent 70%);border-radius:50%}
.hero::after{content:"";position:absolute;left:-60px;bottom:-100px;width:240px;height:240px;background:radial-gradient(circle,rgba(255,122,69,.25),transparent 70%);border-radius:50%}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.3fr 1fr;gap:30px;align-items:center}
.hero h1{color:#fff;font-size:30px;line-height:1.35;margin-bottom:14px}
.hero p{color:#cfe1f3;font-size:15px;margin-bottom:22px;max-width:520px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:8px;font-weight:600;font-size:15px;border:none;cursor:pointer;transition:all .18s}
.btn-primary{background:var(--accent);color:#06212C}
.btn-primary:hover{background:var(--accent-2);transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,194,199,.4)}
.btn-warn{background:var(--warn);color:#fff}
.btn-warn:hover{background:#FF915E;transform:translateY(-2px);box-shadow:0 10px 22px rgba(255,122,69,.35)}
.btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.4);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.hero-art{position:relative;height:240px;border-radius:12px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);overflow:hidden}
.hero-art svg{width:100%;height:100%}
.hero-meta{display:flex;gap:22px;margin-top:18px;flex-wrap:wrap;color:#cfe1f3;font-size:13px}
.hero-meta b{color:#fff;font-size:16px;margin-right:4px}

/* ===== 模块标题 ===== */
.section{margin:28px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:14px;border-left:4px solid var(--accent);padding-left:10px}
.section-head h2{font-size:20px;margin:0;color:var(--primary)}
.section-head .more{font-size:13px;color:var(--text-2)}
.section-head .more:hover{color:var(--accent)}

/* ===== 头条三联图 ===== */
.top3{display:grid;grid-template-columns:2fr 1fr 1fr;gap:14px}
.top3 .card{position:relative;border-radius:var(--radius);overflow:hidden;background:#fff;box-shadow:var(--shadow);transition:transform .2s}
.top3 .card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.top3 .card img{width:100%;height:180px;object-fit:cover}
.top3 .card.feature img{height:260px}
.top3 .card .title{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;background:linear-gradient(to top,rgba(11,31,51,.92),transparent);color:#fff;font-weight:700;font-size:15.5px}
.top3 .card .tag{position:absolute;top:10px;left:10px;background:var(--accent);color:#06212C;padding:3px 10px;font-size:11.5px;font-weight:700;border-radius:4px}

/* ===== 价值四宫格 ===== */
.values{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.value-card{background:#fff;border-radius:var(--radius);padding:20px 18px;box-shadow:var(--shadow);transition:all .2s;border-top:3px solid var(--accent)}
.value-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.value-card .icon{width:46px;height:46px;border-radius:10px;background:linear-gradient(135deg,#0B2A4A,#00C2C7);display:flex;align-items:center;justify-content:center;margin-bottom:12px;color:#fff;font-size:22px;font-weight:700}
.value-card h3{font-size:16px;margin-bottom:6px}
.value-card p{color:var(--text-2);font-size:13.5px}

/* ===== 平台下载矩阵 ===== */
.platform-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.platform-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:all .2s;text-align:center;padding:24px 16px;border:1px solid var(--line)}
.platform-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--accent)}
.platform-card .pic{height:96px;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.platform-card .pic svg{width:80px;height:80px}
.platform-card h3{font-size:17px;margin-bottom:4px}
.platform-card .ver{font-size:12px;color:var(--text-2);margin-bottom:14px}
.platform-card .btn{width:100%;justify-content:center}
.platform-card .sub{font-size:12px;color:var(--text-2);margin-top:8px}

/* ===== 两栏布局 ===== */
.layout-2{display:grid;grid-template-columns:1fr 320px;gap:20px}
.layout-2.no-side{grid-template-columns:1fr}

/* ===== 列表卡片 ===== */
.article-list{display:grid;gap:12px}
.article-card{background:#fff;border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);display:grid;grid-template-columns:120px 1fr;gap:14px;transition:transform .15s}
.article-card:hover{transform:translateX(3px)}
.article-card .thumb{border-radius:8px;overflow:hidden;background:var(--bg);height:88px;display:flex;align-items:center;justify-content:center}
.article-card .thumb img{width:100%;height:100%;object-fit:cover}
.article-card h3{font-size:16px;margin-bottom:6px}
.article-card h3 a{color:var(--primary)}
.article-card h3 a:hover{color:var(--accent)}
.article-card .excerpt{color:var(--text-2);font-size:13.5px;line-height:1.6}
.article-card .meta{font-size:12px;color:var(--text-2);margin-top:8px;display:flex;gap:10px}

/* ===== 侧栏 ===== */
.aside{display:flex;flex-direction:column;gap:16px}
.widget{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}
.widget h3{font-size:15px;border-bottom:1px solid var(--line);padding-bottom:8px;margin-bottom:10px}
.rank-list li{display:flex;gap:10px;align-items:center;padding:9px 0;border-bottom:1px dashed var(--line);font-size:13.5px}
.rank-list li:last-child{border-bottom:none}
.rank-list .num{display:inline-flex;width:20px;height:20px;background:#E6EAF0;color:var(--text-2);border-radius:4px;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.rank-list li:nth-child(1) .num{background:var(--warn);color:#fff}
.rank-list li:nth-child(2) .num{background:#FF915E;color:#fff}
.rank-list li:nth-child(3) .num{background:#FFB97A;color:#fff}
.rank-list a{color:var(--text);flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rank-list a:hover{color:var(--accent)}
.rank-list .hot{color:var(--warn);font-size:11px;font-weight:700}

.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud a{padding:5px 12px;background:#F0F4F9;border-radius:14px;font-size:12.5px;color:var(--primary-2)}
.tag-cloud a:hover{background:var(--accent);color:#fff}

/* ===== FAQ ===== */
.faq{display:grid;gap:14px}
.faq-item{background:#fff;border-radius:var(--radius);padding:18px 22px;box-shadow:var(--shadow);border-left:4px solid var(--accent)}
.faq-item h3{font-size:16px;color:var(--primary);margin-bottom:10px;display:flex;gap:8px}
.faq-item h3::before{content:"Q";background:var(--accent);color:#fff;width:24px;height:24px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:12px;flex-shrink:0}
.faq-item .answer{color:var(--text);padding-left:32px}
.faq-item .answer p{margin-bottom:8px}
.faq-item .answer ol{padding-left:24px;margin:6px 0}
.faq-item .answer ol li{padding:4px 0;color:var(--text);font-size:14px}
.faq-item .answer ol li b{color:var(--primary)}
.faq-item .ext{padding-left:32px;margin-top:10px;padding-top:10px;border-top:1px dashed var(--line);font-size:13px;color:var(--text-2)}
.faq-item .ext a{color:var(--primary-2);font-weight:600}

/* ===== 教程/卡片网格 ===== */
.tutorial-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.tutorial-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:all .2s}
.tutorial-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.tutorial-card img{width:100%;height:160px;object-fit:cover}
.tutorial-card .body{padding:14px 16px}
.tutorial-card h3{font-size:15px;margin-bottom:6px}
.tutorial-card p{color:var(--text-2);font-size:13px}

/* ===== Table ===== */
.spec-table{width:100%;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border-collapse:collapse;margin:16px 0}
.spec-table th,.spec-table td{padding:12px 16px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}
.spec-table th{background:#F0F4F9;color:var(--primary);font-weight:700;width:160px}
.spec-table tr:last-child td{border-bottom:none}

/* ===== Anchor nav ===== */
.anchor-nav{position:sticky;top:0;background:#fff;z-index:50;box-shadow:var(--shadow);padding:10px 0;border-bottom:1px solid var(--line)}
.anchor-nav ul{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.anchor-nav li a{padding:6px 14px;background:#F0F4F9;border-radius:14px;font-size:13px;color:var(--primary-2)}
.anchor-nav li a:hover{background:var(--accent);color:#fff}
.anchor-nav li.title{color:var(--primary);font-weight:700;font-size:14px;margin-right:6px}

/* ===== 下载按钮矩阵 ===== */
.download-matrix{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:20px 0}
.dl-card{background:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);border:1px solid var(--line);display:grid;grid-template-columns:90px 1fr auto;gap:18px;align-items:center;transition:all .2s}
.dl-card:hover{box-shadow:var(--shadow-hover);border-color:var(--accent)}
.dl-card .icon{width:90px;height:90px;border-radius:18px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0B2A4A,#00C2C7);color:#fff}
.dl-card .icon svg{width:48px;height:48px}
.dl-card h3{font-size:18px;margin-bottom:4px}
.dl-card .meta{font-size:12.5px;color:var(--text-2);margin-bottom:8px}
.dl-card .desc{font-size:13.5px;color:var(--text-2)}

/* ===== Step ===== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:16px 0}
.step{background:#fff;border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);position:relative;text-align:center}
.step .num{position:absolute;left:14px;top:14px;width:28px;height:28px;background:var(--accent);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.step h4{font-size:15px;margin:8px 0 6px}
.step p{color:var(--text-2);font-size:13px}

/* ===== 关于页结构 ===== */
.about-hero{background:linear-gradient(120deg,#0B2A4A,#13456F);color:#fff;border-radius:var(--radius);padding:40px;margin:18px 0}
.about-hero h1{color:#fff;font-size:30px}
.about-hero p{color:#cfe1f3;max-width:760px;margin-top:10px}
.about-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}
.about-grid .card{background:#fff;border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.about-grid .card h3{font-size:16px;margin-bottom:8px;color:var(--primary)}
.about-grid .card p{color:var(--text-2);font-size:13.5px}

/* ===== footer ===== */
.site-footer{background:#0B1F33;color:#9fb3c8;padding:36px 0 18px;margin-top:30px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:24px;padding-bottom:24px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-grid h4{color:#fff;font-size:15px;margin-bottom:12px;font-weight:700}
.footer-grid a,.footer-grid p{color:#9fb3c8;font-size:13px;display:block;padding:4px 0}
.footer-grid a:hover{color:var(--accent-2)}
.footer-bottom{text-align:center;font-size:12.5px;padding-top:18px;color:#7c8da3}

/* ===== 响应式 ===== */
@media (max-width:980px){
  .top3,.values,.platform-grid,.tutorial-grid,.steps,.download-matrix,.about-grid{grid-template-columns:1fr 1fr}
  .layout-2{grid-template-columns:1fr}
  .hero-inner{grid-template-columns:1fr}
  .top3 .card.feature img{height:200px}
}
@media (max-width:640px){
  .top3,.values,.platform-grid,.tutorial-grid,.steps,.download-matrix,.about-grid{grid-template-columns:1fr}
  .article-card{grid-template-columns:1fr}
  .article-card .thumb{height:160px}
  h1{font-size:22px}
  .hero{padding:24px}
  .footer-grid{grid-template-columns:1fr 1fr}
}