/* Set-B · 企业仪表盘 · 深色商务 + 侧边栏 */
* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --bg:#0f172a; --panel:#1e293b; --panel-2:#273449;
  --line:#334155; --text:#e2e8f0; --sub:#94a3b8;
  --accent:#38bdf8; --accent-2:#22d3ee; --accent-warm:#f59e0b;
  --success:#10b981; --danger:#ef4444;
  --radius:10px;
}
html,body {
  background:var(--bg); color:var(--text);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height:1.6;
}
a { color:var(--accent); text-decoration:none; }
img { max-width:100%; display:block; }

/* 顶栏 */
.topbar {
  height:56px; background:#0b1220; border-bottom:1px solid var(--line);
  display:flex; align-items:center; padding:0 24px;
  position:sticky; top:0; z-index:10;
}
.topbar .logo {
  display:flex; align-items:center; gap:10px; font-weight:700; color:#fff;
}
.topbar .logo img { width:30px; height:30px; border-radius:6px; }
.topbar .crumbs { margin-left:24px; color:var(--sub); font-size:13px; }
.topbar .crumbs span { color:#fff; }
.topbar .user { margin-left:auto; color:var(--sub); font-size:13px; }

/* 主布局 */
.layout { display:grid; grid-template-columns:240px 1fr; min-height:calc(100vh - 56px); }

/* 侧边栏 */
aside.side {
  background:#0b1220; border-right:1px solid var(--line);
  padding:24px 16px;
}
.side h4 {
  color:var(--sub); font-size:11px; text-transform:uppercase;
  letter-spacing:1.5px; padding:0 8px; margin:18px 0 8px;
}
.side a {
  display:flex; align-items:center; gap:10px;
  padding:9px 12px; border-radius:8px;
  color:var(--sub); font-size:14px; font-weight:500;
}
.side a:hover { background:var(--panel); color:#fff; }
.side a.active {
  background: linear-gradient(90deg, rgba(56,189,248,.18), transparent);
  color:#fff; border-left:3px solid var(--accent); padding-left:9px;
}
.side .ico { width:18px; text-align:center; opacity:.8; }

/* 内容区 */
main.con { padding:32px; }
.page-head { display:flex; justify-content:space-between; align-items:flex-end; margin-bottom:24px; flex-wrap:wrap; gap:16px; }
.page-head h1 { font-size:26px; font-weight:700; color:#fff; }
.page-head h1 .pill { background:var(--accent); color:#0f172a; font-size:12px; padding:3px 10px; border-radius:999px; margin-left:8px; vertical-align:middle; }
.page-head .sub { color:var(--sub); font-size:14px; margin-top:6px; }

/* 数据卡 */
.kpi { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin-bottom:28px; }
.kpi .card {
  background:var(--panel); border:1px solid var(--line);
  border-radius:var(--radius); padding:18px;
}
.kpi .card .label { color:var(--sub); font-size:12px; text-transform:uppercase; letter-spacing:1px; }
.kpi .card .value { font-size:28px; font-weight:700; color:#fff; margin-top:4px; }
.kpi .card .delta { font-size:12px; margin-top:6px; }
.kpi .card .delta.up { color:var(--success); }
.kpi .card .delta.down { color:var(--danger); }
.kpi .card .spark { color:var(--accent-warm); font-size:11px; }

/* 面板 */
.panel {
  background:var(--panel); border:1px solid var(--line);
  border-radius:var(--radius); padding:20px; margin-bottom:20px;
}
.panel h3 { font-size:16px; color:#fff; margin-bottom:12px; display:flex; align-items:center; gap:8px; }
.panel h3::before { content:""; width:4px; height:16px; background:var(--accent); border-radius:2px; }

/* 表格 */
table.dash { width:100%; border-collapse:collapse; font-size:13px; }
table.dash th, table.dash td { padding:12px 10px; text-align:left; border-bottom:1px solid var(--line); }
table.dash th { color:var(--sub); font-weight:500; text-transform:uppercase; font-size:11px; letter-spacing:.5px; }
table.dash td .tag {
  display:inline-block; padding:2px 8px; border-radius:4px; font-size:11px;
}
.tag.ok { background:rgba(16,185,129,.15); color:#34d399; }
.tag.warn { background:rgba(245,158,11,.15); color:#fbbf24; }
.tag.info { background:rgba(56,189,248,.15); color:#38bdf8; }

/* 按钮 */
.btn-b {
  display:inline-flex; align-items:center; gap:6px;
  padding:9px 18px; border-radius:6px; font-size:13px; font-weight:600;
  background:var(--accent); color:#0f172a; border:0; cursor:pointer;
  transition:.2s;
}
.btn-b:hover { background:var(--accent-2); }
.btn-b.ghost { background:transparent; color:var(--accent); border:1px solid var(--accent); }
.btn-b.ghost:hover { background:rgba(56,189,248,.1); }
.btn-b.warm { background:var(--accent-warm); color:#0f172a; }

/* 下载卡（dashboard 风格） */
.dl-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.dl-tile {
  background:var(--panel); border:1px solid var(--line);
  border-radius:var(--radius); overflow:hidden;
  display:flex; flex-direction:column;
}
.dl-tile .thumb { aspect-ratio:16/9; object-fit:cover; width:100%; border-bottom:1px solid var(--line); }
.dl-tile .body { padding:18px; flex:1; display:flex; flex-direction:column; }
.dl-tile h3 { font-size:16px; color:#fff; margin-bottom:6px; }
.dl-tile .ver { color:var(--sub); font-size:12px; margin-bottom:10px; }
.dl-tile p { color:var(--sub); font-size:13px; flex:1; margin-bottom:14px; }
.dl-tile .row { display:flex; justify-content:space-between; align-items:center; padding-top:10px; border-top:1px dashed var(--line); margin-top:auto; }
.dl-tile .row .stat { font-size:11px; color:var(--sub); }

/* 系统要求 */
.req-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.req-b {
  background:var(--panel); border:1px solid var(--line);
  border-radius:var(--radius); padding:20px;
}
.req-b h3 { color:#fff; font-size:16px; margin-bottom:10px; display:flex; align-items:center; gap:8px; }
.req-b h3 .badge {
  background:rgba(56,189,248,.15); color:var(--accent);
  font-size:11px; padding:2px 8px; border-radius:4px; font-weight:600;
}
.req-b ul { list-style:none; }
.req-b li { padding:7px 0; border-bottom:1px dashed var(--line); color:var(--sub); font-size:13px; display:flex; }
.req-b li strong { color:#fff; min-width:80px; }

/* 步骤 */
.steps-b { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; }
.step-b {
  background:var(--panel); border:1px solid var(--line);
  border-left:3px solid var(--accent);
  border-radius:var(--radius); padding:16px;
  position:relative;
}
.step-b .num { font-size:24px; font-weight:800; color:var(--accent); }
.step-b h4 { color:#fff; font-size:15px; margin:4px 0 6px; }
.step-b p { color:var(--sub); font-size:12px; }
.step-b .plat { display:inline-block; margin-top:8px; background:var(--bg); color:var(--accent-warm); font-size:10px; padding:2px 8px; border-radius:4px; font-weight:600; }

/* FAQ */
.faq-b details {
  background:var(--panel); border:1px solid var(--line);
  border-radius:var(--radius); padding:14px 18px; margin-bottom:8px;
}
.faq-b summary { cursor:pointer; color:#fff; font-weight:600; font-size:14px; list-style:none; display:flex; justify-content:space-between; }
.faq-b summary::after { content:"▾"; color:var(--accent); }
.faq-b details[open] summary::after { content:"▴"; }
.faq-b p { color:var(--sub); font-size:13px; margin-top:8px; }

/* 404 */
.err-b {
  background:var(--panel); border:1px solid var(--line);
  border-radius:var(--radius); padding:60px 30px; text-align:center;
}
.err-b .code { font-size:120px; font-weight:800; color:var(--accent); line-height:1; }
.err-b h1 { color:#fff; font-size:24px; margin:8px 0 12px; }
.err-b p { color:var(--sub); margin-bottom:24px; }

/* 页脚 */
.foot-b { background:#0b1220; border-top:1px solid var(--line); padding:18px; text-align:center; color:var(--sub); font-size:12px; }
.foot-b a { color:var(--accent); }

@media (max-width: 900px) {
  .layout { grid-template-columns:1fr; }
  aside.side { display:none; }
  .kpi { grid-template-columns:repeat(2,1fr); }
  .dl-grid, .req-grid, .steps-b { grid-template-columns:1fr; }
}