/* ============================================================
   开店指南 · 共享设计系统 (Design System)
   基于 index.html 的视觉语言，统一全站多页面风格
   ============================================================ */
:root{
  --bg:#f8f9fb;--bg2:#f1f3f6;--card:#fff;--ink:#111318;--muted:#6b7280;--line:#e5e7eb;
  --blue:#2563eb;--blue-soft:#eff6ff;--blue-mid:#bfdbfe;--blue-bg:#eff6ff;
  --red:#dc2626;--red-bg:#fef2f2;
  --yellow:#ca8a04;--yellow-bg:#fefce8;
  --green:#16a34a;--green-bg:#f0fdf4;
  --purple:#7c3aed;--purple-bg:#f5f3ff;
  --cyan:#0891b2;--cyan-bg:#ecfeff;
  --shadow-sm:0 1px 2px rgba(0,0,0,.04);
  --shadow:0 1px 3px rgba(0,0,0,.04),0 6px 16px rgba(0,0,0,.05);
  --shadow-lg:0 2px 4px rgba(0,0,0,.03),0 8px 24px rgba(0,0,0,.07);
  --radius:14px;--radius-lg:18px;--ease:cubic-bezier(.16,1,.3,1);
  --maxw:1160px;
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased;
  font-size:15px;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{width:min(var(--maxw),calc(100% - 32px));margin:0 auto}
.kicker{color:var(--blue);font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin:0 0 8px}
h1,h2,h3,h4{letter-spacing:-.02em;line-height:1.15}
h2{font-size:clamp(22px,3vw,32px);line-height:1.1;font-weight:900;margin:0 0 6px}
h3{font-size:18px;font-weight:800;margin:0 0 6px}
h2 small{font-size:.48em;font-weight:600;color:var(--muted);display:block;margin-top:4px;letter-spacing:0}
p{margin:0 0 12px}
.muted{color:var(--muted)}
.center{text-align:center}
.sec{margin:40px 0}
.sec-sm{margin:24px 0}

/* ---------- 按钮 ---------- */
.btn{border:0;cursor:pointer;border-radius:10px;padding:11px 20px;font-weight:700;font-size:13px;
  transition:all .2s var(--ease);display:inline-flex;align-items:center;gap:6px;letter-spacing:-.01em;font-family:inherit}
.btn:active{transform:scale(.97)}
.btn-primary{color:#fff;background:var(--blue);box-shadow:0 4px 12px rgba(37,99,235,.22)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(37,99,235,.28)}
.btn-ghost{color:var(--ink);background:var(--card);border:1px solid var(--line)}
.btn-ghost:hover{border-color:#cbd5e1;box-shadow:var(--shadow-sm)}
.btn-sm{padding:8px 14px;font-size:12px}
.btn-xs{padding:6px 10px;font-size:11px;border-radius:8px;font-weight:700}

/* ---------- 顶部导航 ---------- */
.site-nav{position:sticky;top:0;z-index:50;background:rgba(248,249,251,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.site-nav .wrap{height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:15px;letter-spacing:-.01em;white-space:nowrap}
.brand .mark{width:30px;height:30px;border-radius:9px;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:900;flex-shrink:0}
.nav-links{display:flex;gap:4px;font-size:13px;font-weight:600;color:var(--muted);align-items:center}
.nav-links a{padding:8px 12px;border-radius:9px;transition:all .15s}
.nav-links a:hover{color:var(--ink);background:var(--bg2)}
.nav-links a.active{color:var(--blue);background:var(--blue-soft)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:9px;width:40px;height:38px;cursor:pointer;font-size:18px;color:var(--ink)}
@media(max-width:860px){
  .nav-links{display:none;position:absolute;top:56px;left:0;right:0;background:var(--card);border-bottom:1px solid var(--line);flex-direction:column;padding:8px 16px;gap:2px;box-shadow:var(--shadow)}
  .nav-links.show{display:flex}
  .nav-links a{padding:11px 10px;border-radius:8px}
  .nav-toggle{display:grid;place-items:center}
}

/* ---------- 页脚 ---------- */
.site-foot{margin-top:56px;padding:32px 0;background:var(--ink);color:#9ca3af;font-size:13px}
.site-foot .wrap{display:grid;gap:18px}
.site-foot a{color:#cbd5e1}
.site-foot strong{color:#f3f4f6}
.site-foot .foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:24px}
.site-foot .foot-col h4{color:#f3f4f6;font-size:13px;margin:0 0 10px}
.site-foot .foot-col a{display:block;margin:6px 0;font-size:13px}
.site-foot .foot-note{font-size:12px;line-height:1.7;color:#7b8190;border-top:1px solid rgba(255,255,255,.08);padding-top:16px}
@media(max-width:720px){.site-foot .foot-grid{grid-template-columns:1fr}}

/* ---------- 卡片 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.card-lg{padding:28px}
.card-hov{transition:all .2s var(--ease)}
.card-hov:hover{border-color:var(--blue-mid);box-shadow:var(--shadow-lg);transform:translateY(-2px)}

/* ---------- Hero ---------- */
.page-hero{padding:56px 0 36px}
.page-hero h1{font-size:clamp(30px,5vw,50px);line-height:1.05;font-weight:900;letter-spacing:-.04em;margin:0 0 14px}
.page-hero .sub{font-size:18px;font-weight:700;color:#374151;margin:0 0 14px;max-width:680px}
.page-hero .desc{font-size:15px;color:var(--muted);max-width:640px}
.hero-ctas{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}

/* ---------- 网格工具 ---------- */
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-auto{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
@media(max-width:860px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* ---------- 徽章 ---------- */
.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 9px;border-radius:99px;font-size:11px;font-weight:800;white-space:nowrap}
.badge-red{color:#991b1b;background:var(--red-bg)}
.badge-yellow{color:#92400e;background:var(--yellow-bg)}
.badge-green{color:#166534;background:var(--green-bg)}
.badge-blue{color:#1e40af;background:var(--blue-soft)}
.badge-purple{color:#5b21b6;background:var(--purple-bg)}
.badge-cyan{color:#155e75;background:var(--cyan-bg)}
.badge-gray{color:#374151;background:var(--bg2)}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block}
.dot-red{background:var(--red)}.dot-yellow{background:var(--yellow)}.dot-green{background:var(--green)}.dot-blue{background:var(--blue)}

/* ---------- 统计数字 ---------- */
.stat{display:grid;gap:2px}
.stat b{font-size:30px;font-weight:900;letter-spacing:-.04em;line-height:1}
.stat span{font-size:12px;color:var(--muted);font-weight:700}

/* ---------- 表格 ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
table.tbl{width:100%;border-collapse:collapse;font-size:13px;min-width:520px}
table.tbl th{text-align:left;padding:11px 14px;background:var(--bg2);font-weight:800;color:var(--ink);border-bottom:1px solid var(--line);white-space:nowrap}
table.tbl td{padding:10px 14px;border-bottom:1px solid var(--line);color:var(--muted)}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tbody tr:hover{background:var(--bg)}
table.tbl td b{color:var(--ink)}

/* ---------- 进度/评分条 ---------- */
.bar{height:8px;background:#eef0f3;border-radius:99px;overflow:hidden}
.bar .fill{height:100%;border-radius:inherit;background:var(--blue);transition:width .5s var(--ease)}
.bar .fill.red{background:var(--red)}.bar .fill.yellow{background:var(--yellow)}.bar .fill.green{background:var(--green)}

/* ---------- 标签/筛选 ---------- */
.chip{padding:8px 14px;border-radius:10px;background:var(--bg);border:1px solid var(--line);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;font-family:inherit}
.chip:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.chip.active{background:var(--blue);color:#fff;border-color:var(--blue)}
select,input[type=text],input[type=search],input[type=number],textarea{
  font-family:inherit;font-size:14px;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);outline:none;transition:border-color .15s;width:100%
}
select:focus,input:focus,textarea:focus{border-color:var(--blue)}
label.fld{display:grid;gap:5px;font-size:12px;font-weight:800;color:var(--muted)}

/* ---------- 提示框 ---------- */
.callout{padding:14px 16px;border-radius:12px;font-size:13px;line-height:1.6}
.callout-blue{background:var(--blue-soft);border:1px solid rgba(37,99,235,.18);color:#1e40af}
.callout-yellow{background:var(--yellow-bg);border:1px solid #fde68a;color:#92400e}
.callout-red{background:var(--red-bg);border:1px solid #fecaca;color:#991b1b}
.callout-green{background:var(--green-bg);border:1px solid #bbf7d0;color:#166534}

/* ---------- 步骤条 ---------- */
.steps{display:grid;gap:12px;counter-reset:step}
.step{display:grid;grid-template-columns:36px 1fr;gap:14px;padding:16px;border-radius:12px;background:var(--card);border:1px solid var(--line)}
.step .num{width:36px;height:36px;border-radius:10px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900;font-size:14px}
.step h4{margin:0 0 4px;font-size:14px}
.step p{margin:0;font-size:13px;color:var(--muted)}

/* ---------- 模型卡 / 维度卡 ---------- */
.dim{display:grid;gap:10px;padding:18px;border-radius:var(--radius);background:var(--card);border:1px solid var(--line)}
.dim .dim-hd{display:flex;align-items:center;justify-content:space-between;gap:8px}
.dim .w{font-size:11px;font-weight:800;padding:3px 8px;border-radius:99px;background:var(--blue-soft);color:var(--blue)}
.dim .desc{font-size:13px;color:var(--muted)}

/* ---------- 折叠问答 ---------- */
details.faq{padding:16px 18px;border-radius:12px;background:var(--card);border:1px solid var(--line);margin-bottom:10px}
details.faq summary{cursor:pointer;font-weight:800;font-size:14px;list-style:none;display:flex;justify-content:space-between;align-items:center}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";font-size:18px;color:var(--muted);font-weight:700}
details.faq[open] summary::after{content:"−"}
details.faq p{margin:10px 0 0;font-size:13px;color:var(--muted)}

/* ---------- 工具类 ---------- */
.gap-sm{gap:8px}.gap-md{gap:14px}.gap-lg{gap:22px}
.mt-0{margin-top:0}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mt-4{margin-top:36px}
.mb-0{margin-bottom:0}.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}
.flex{display:flex}.flex-wrap{flex-wrap:wrap}.items-center{align-items:center}.justify-between{justify-content:space-between}
.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}
.text-sm{font-size:13px}.text-xs{font-size:12px}.fw-800{font-weight:800}
.lead{font-size:16px;color:#374151}
.divider{height:1px;background:var(--line);margin:24px 0}
.pill-row{display:flex;flex-wrap:wrap;gap:8px}