:root{
  --brand:#ff6a3d;
  --brand-d:#e8542a;
  --ink:#1f2430;
  --muted:#6b7280;
  --line:#ececf0;
  --bg:#f7f8fa;
  --card:#fff;
}
*{margin:0;padding:0;box-sizing:border-box}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.btn{
  display:inline-block;padding:12px 26px;border-radius:10px;font-weight:600;
  background:var(--brand);color:#fff;transition:.15s;cursor:pointer;border:none;font-size:15px;
}
.btn:hover{background:var(--brand-d);transform:translateY(-1px)}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn.dark{background:var(--ink);color:#fff}
.btn.dark:hover{background:#000}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:800;font-size:20px;color:var(--brand)}
.nav nav{display:flex;gap:26px;font-size:15px}
.nav nav a:hover{color:var(--brand)}

/* Hero */
.hero{background:linear-gradient(135deg,#ff8a5b 0%,#ff6a3d 60%,#e8542a 100%);color:#fff;padding:80px 0}
.hero h1{font-size:42px;line-height:1.25;margin-bottom:18px;font-weight:800}
.hero p{font-size:18px;opacity:.95;margin-bottom:28px;max-width:640px}
.hero .acts{display:flex;gap:14px;flex-wrap:wrap}
.hero .acts .btn.ghost{background:rgba(255,255,255,.15);color:#fff;border-color:rgba(255,255,255,.6)}

/* 区块 */
.section{padding:64px 0}
.section h2{font-size:30px;text-align:center;margin-bottom:10px}
.section .sub{text-align:center;color:var(--muted);margin-bottom:38px}
.grid{display:grid;gap:20px}
.features{grid-template-columns:repeat(3,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px}
.feature .ic{font-size:28px;margin-bottom:10px}
.feature h3{font-size:18px;margin-bottom:8px}
.feature p{color:var(--muted);font-size:14.5px}

/* 步骤 */
.steps{grid-template-columns:repeat(3,1fr)}
.step .num{width:36px;height:36px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:12px}

/* 价格 */
.pricing{grid-template-columns:repeat(4,1fr);align-items:stretch}
.plan{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px;position:relative}
.plan.hot{border:2px solid var(--brand);box-shadow:0 12px 30px rgba(255,106,61,.18)}
.plan .badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--brand);color:#fff;font-size:12px;padding:4px 12px;border-radius:999px;white-space:nowrap}
.plan .pname{font-size:17px;font-weight:700}
.plan .price{font-size:34px;font-weight:800;margin:12px 0 2px}
.plan .price small{font-size:15px;font-weight:500;color:var(--muted)}
.plan .desc{color:var(--muted);font-size:14px;min-height:40px}
.plan ul{list-style:none;margin:16px 0;flex:1}
.plan li{padding:6px 0 6px 22px;position:relative;font-size:14px;color:#374151}
.plan li:before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}
.plan .btn{width:100%;text-align:center}

/* 合作方式 */
.coop{grid-template-columns:repeat(4,1fr)}
.coop .card{text-align:center}
.coop .ic{font-size:30px;margin-bottom:10px}
.coop h3{font-size:16px;margin-bottom:6px}
.coop p{color:var(--muted);font-size:13.5px}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.faq .q{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:12px}
.faq .q b{display:block;margin-bottom:6px}
.faq .q p{color:var(--muted);font-size:14.5px}

/* 文章列表 */
.article-grid{grid-template-columns:repeat(3,1fr)}
.post{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;display:flex;flex-direction:column}
.post .cover{height:170px;background:linear-gradient(135deg,#ffd3c2,#ffb59a);display:flex;align-items:center;justify-content:center;color:#fff;font-size:22px;font-weight:700}
.post .body{padding:18px}
.post .cat{font-size:12px;color:var(--brand);font-weight:600}
.post h3{font-size:17px;margin:6px 0;line-height:1.4}
.post p{color:var(--muted);font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* 文章详情 */
.article{max-width:780px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:16px;padding:40px}
.article h1{font-size:30px;margin-bottom:14px}
.article .meta{color:var(--muted);font-size:14px;margin-bottom:24px;border-bottom:1px solid var(--line);padding-bottom:14px}
.article .content{font-size:16px;color:#333}
.article .content p{margin-bottom:16px}

/* 表单 / 认证 */
.auth{max-width:420px;margin:60px auto;background:#fff;border:1px solid var(--line);border-radius:16px;padding:34px}
.auth h2{text-align:center;margin-bottom:20px}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;margin-bottom:6px;color:#374151}
.field input,.field textarea,.field select{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand)}
.alert{background:#fff4ef;color:var(--brand-d);border:1px solid #ffd9c9;padding:11px 14px;border-radius:10px;font-size:14px;margin-bottom:16px}
.ok{background:#ecfdf3;color:#067647;border-color:#abefc6}

/* 客户后台 */
.dash{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px}
.stat .big{font-size:30px;font-weight:800;color:var(--brand)}
.banner{background:linear-gradient(135deg,#1f2430,#3a4256);color:#fff;border-radius:14px;padding:24px;margin-bottom:20px}
.banner .btn{margin-top:14px}

/* 后台布局 */
.admin{display:flex;min-height:100vh}
.side{width:220px;background:var(--ink);color:#cfd3dc;padding:20px 14px}
.side .logo{color:#fff;margin-bottom:24px;padding-left:8px}
.side a{display:block;padding:10px 12px;border-radius:8px;margin-bottom:4px;font-size:14.5px}
.side a:hover,.side a.active{background:rgba(255,255,255,.1);color:#fff}
.main{flex:1;padding:28px 34px;overflow:auto}
.main h1{font-size:24px;margin-bottom:18px}
table.t{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
table.t th,table.t td{padding:12px 14px;text-align:left;font-size:14px;border-bottom:1px solid var(--line)}
table.t th{background:#fafafa;color:var(--muted);font-weight:600}
.tag{font-size:12px;padding:2px 9px;border-radius:999px;background:#eef2f7;color:#374151}
.tag.live{background:#ecfdf3;color:#067647}
.tag.trial{background:#fff4ef;color:var(--brand-d)}
.row-actions a{margin-right:10px;color:var(--brand);font-size:13.5px}

/* 页脚 */
.footer{background:var(--ink);color:#aab0bd;padding:40px 0;margin-top:40px}
.footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px}
.footer a{color:#cfd3dc}
.footer .col h4{color:#fff;margin-bottom:10px;font-size:15px}
.footer .col a{display:block;padding:3px 0;font-size:14px}

.muted{color:var(--muted)}
.center{text-align:center}
.mt{margin-top:18px}.mb{margin-bottom:18px}
@media(max-width:860px){
  .features,.pricing,.coop,.steps,.article-grid,.dash{grid-template-columns:1fr 1fr}
  .nav nav{display:none}
}
@media(max-width:560px){
  .features,.pricing,.coop,.steps,.article-grid,.dash{grid-template-columns:1fr}
  .hero h1{font-size:32px}
}