/* ============================================================
   FDE Admin DS v1（2026-09-25）— 零依赖企业后台设计系统（手写 CSS，无构建）
   规格与来源：《DESIGN.md》· docs/27「DESIGN.md 先行」五步链 · 试点 A/B
   原则：浅色专业 · 边框而非阴影 · 数字 tabular · 语义色克制 · 密度适中
   ============================================================ */
:root{
  --bg:#f4f6fa; --panel:#fff; --panel-2:#fafbfd;
  --line:#e4e8f0; --line-strong:#d3dae6;
  --text:#1b2430; --dim:#5f6b7c; --faint:#646f85;   /* 2026-09-26 a11y: 对 #f4f6fa 4.67:1 */
  --acc:#2563eb; --acc-hover:#1d4ed8; --acc-soft:#eaf1fe; --acc-ink:#fff;
  --ok:#15803d; --ok-soft:#e8f6ee; --warn:#b45309; --warn-soft:#fdf3e3; --bad:#b91c1c; --bad-soft:#fdecec;
  --r:12px; --r-sm:9px; --r-xs:6px;
  --shadow-sm:0 1px 2px rgba(16,24,40,.05);
  --shadow-pop:0 16px 40px rgba(16,24,40,.14),0 2px 8px rgba(16,24,40,.08);
  --font:system-ui,-apple-system,"Segoe UI","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:14px/1.55 var(--font)}
a{color:var(--acc);text-decoration:none}
.num{font-variant-numeric:tabular-nums}
.mono{font-family:var(--mono);font-size:.92em}
.muted{color:var(--dim)}
.faint{color:var(--faint)}
::selection{background:rgba(37,99,235,.15)}
:focus-visible{outline:2px solid rgba(37,99,235,.5);outline-offset:2px;border-radius:4px}

/* ---------- 应用骨架 ---------- */
.shell{display:flex;min-height:100vh}
.side{width:220px;background:var(--panel);border-right:1px solid var(--line);padding:16px 12px;
  flex-shrink:0;position:sticky;top:0;height:100vh;overflow-y:auto;display:flex;flex-direction:column}
.brand{display:flex;align-items:center;gap:10px;padding:4px 8px 16px;border-bottom:1px solid var(--line);margin-bottom:12px}
.brand .mark{width:30px;height:30px;border-radius:9px;flex-shrink:0;background:linear-gradient(140deg,#3b82f6,#2563eb);
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px}
.brand b{font-size:14.5px;letter-spacing:.01em}
.brand small{display:block;color:var(--faint);font-weight:400;font-size:11px;margin-top:1px}
.nav{flex:1}
.nav a{display:flex;align-items:center;gap:9px;padding:8px 11px;border-radius:var(--r-sm);color:var(--dim);
  margin-bottom:2px;font-size:13.5px;transition:background .12s,color .12s}
.nav a:hover{background:var(--panel-2);color:var(--text)}
.nav a.active{background:var(--acc-soft);color:var(--acc);font-weight:600}
.nav .ghead{color:var(--faint);font-size:11px;letter-spacing:.08em;padding:10px 11px 4px}
.side .foot{border-top:1px solid var(--line);padding:10px 8px 2px;font-size:12.5px;color:var(--dim)}
.main{flex:1;min-width:0;padding:0 26px 48px;max-width:1280px;margin-inline:auto;width:100%}
.topbar{display:flex;align-items:center;gap:12px;padding:18px 0 14px;flex-wrap:wrap}
.topbar h1{font-size:19px;font-weight:700;margin:0;letter-spacing:.01em}
.topbar .sub{color:var(--faint);font-size:12.5px}
.topbar .sp{flex:1}

/* ---------- 卡片 / KPI ---------- */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow-sm)}
.card h2{font-size:14px;font-weight:600;margin:0 0 12px;color:var(--text)}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin-bottom:14px}
.kpi .lbl{font-size:12px;color:var(--dim);margin-bottom:6px}
.kpi .val{font-size:26px;font-weight:700;letter-spacing:-.01em}
.kpi .val .unit{font-size:12.5px;font-weight:500;color:var(--faint);margin-left:3px}
.kpi .sub{font-size:11.5px;color:var(--faint);margin-top:4px}

/* ---------- 工具条 / 按钮 / 表单 ---------- */
.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.toolbar .sp{flex:1}
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line-strong);background:var(--panel);
  color:var(--text);border-radius:var(--r-sm);padding:7px 14px;font-size:13px;font-weight:600;cursor:pointer;
  transition:background .12s,border-color .12s,opacity .12s}
.btn:hover{border-color:#b9c3d3;background:var(--panel-2)}
.btn.primary{background:var(--acc);border-color:var(--acc);color:var(--acc-ink)}
.btn.primary:hover{background:var(--acc-hover)}
.btn.danger{color:var(--bad);border-color:#e7b6b6}
.btn.danger:hover{background:var(--bad-soft)}
.btn.ghost{border-color:transparent;background:transparent;color:var(--dim)}
.btn.ghost:hover{background:var(--panel-2);color:var(--text)}
.btn.sm{padding:4px 10px;font-size:12px}
.btn:disabled{opacity:.5;cursor:not-allowed}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-size:12.5px;color:var(--dim)}
.field label b{color:var(--bad);font-weight:600;margin-left:2px}
input,select,textarea{border:1px solid var(--line-strong);background:var(--panel);border-radius:var(--r-sm);
  padding:8px 11px;font:inherit;color:var(--text);outline:none;transition:border-color .12s,box-shadow .12s}
input:focus,select:focus,textarea:focus{border-color:var(--acc);box-shadow:0 0 0 3px var(--acc-soft)}
input::placeholder{color:var(--faint)}
.search{position:relative;min-width:240px}
.search input{width:100%;padding-left:30px}
.search::before{content:"⌕";position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--faint);font-size:14px}

/* ---------- 表格 ---------- */
.tbl-wrap{overflow-x:auto}
table.tbl{width:100%;border-collapse:collapse}
.tbl th{font-size:12px;color:var(--dim);font-weight:600;text-align:left;padding:9px 12px;
  border-bottom:1px solid var(--line-strong);background:var(--panel-2);white-space:nowrap}
.tbl td{padding:10px 12px;border-bottom:1px solid var(--line);font-size:13.5px;vertical-align:middle}
.tbl tbody tr:hover{background:var(--panel-2)}
.tbl .r{text-align:right}
.tbl .actions{white-space:nowrap;text-align:right}

/* ---------- 徽标 / 状态 ---------- */
.badge{display:inline-flex;align-items:center;gap:4px;border-radius:999px;padding:2px 9px;font-size:11.5px;
  font-weight:600;border:1px solid transparent;white-space:nowrap}
.badge.ok{color:var(--ok);background:var(--ok-soft);border-color:#cde9d8}
.badge.warn{color:var(--warn);background:var(--warn-soft);border-color:#f3ddba}
.badge.bad{color:var(--bad);background:var(--bad-soft);border-color:#f0c8c8}
.badge.dim{color:var(--dim);background:var(--panel-2);border-color:var(--line)}

/* ---------- 空态 / 加载 / 提示 ---------- */
.empty{text-align:center;padding:44px 10px;color:var(--faint)}
.empty .big{font-size:34px;margin-bottom:8px}
.skel{height:14px;border-radius:6px;background:linear-gradient(90deg,#eef1f6 25%,#f7f9fc 50%,#eef1f6 75%);
  background-size:200% 100%;animation:sk 1.2s infinite}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}
#toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);z-index:99;display:flex;
  flex-direction:column;gap:8px;align-items:center}
.toast{background:#111826;color:#eef2f9;border-radius:var(--r-sm);padding:9px 16px;font-size:13px;
  box-shadow:var(--shadow-pop);opacity:0;transform:translateY(8px);transition:opacity .18s,transform .18s}
.toast.show{opacity:1;transform:none}
.toast.ok{background:#14532d}.toast.err{background:#7f1d1d}

/* ---------- 弹层（模态） ---------- */
.overlay{position:fixed;inset:0;background:rgba(16,24,40,.45);z-index:90;display:flex;align-items:center;
  justify-content:center;padding:18px;opacity:0;pointer-events:none;transition:opacity .16s}
.overlay.show{opacity:1;pointer-events:auto}
.dialog{background:var(--panel);border-radius:var(--r);width:100%;max-width:440px;box-shadow:var(--shadow-pop);
  transform:translateY(8px) scale(.99);transition:transform .16s}
.overlay.show .dialog{transform:none}
.dialog header{display:flex;align-items:center;padding:16px 18px 0}
.dialog header b{font-size:15px}
.dialog header .x{margin-left:auto;cursor:pointer;color:var(--faint);font-size:18px;line-height:1;padding:4px}
.dialog .body{padding:14px 18px;display:flex;flex-direction:column;gap:12px}
.dialog footer{display:flex;justify-content:flex-end;gap:10px;padding:0 18px 18px}
.err-text{color:var(--bad);font-size:12.5px;min-height:16px}

/* ---------- 登录页 ---------- */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;
  background:radial-gradient(900px 420px at 20% -10%,rgba(37,99,235,.10),transparent 60%),
             radial-gradient(700px 380px at 100% 110%,rgba(21,128,61,.07),transparent 55%),var(--bg)}
.login-card{width:100%;max-width:860px;display:grid;grid-template-columns:1.1fr 1fr;background:var(--panel);
  border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-pop)}
.login-hero{padding:38px 34px;background:linear-gradient(150deg,#1e3a8a,#2563eb 55%,#3b82f6);color:#fff;
  display:flex;flex-direction:column;justify-content:space-between}
.login-hero .mark{width:44px;height:44px;border-radius:12px;background:rgba(255,255,255,.16);display:flex;
  align-items:center;justify-content:center;font-weight:900;font-size:20px}
.login-hero h1{font-size:24px;margin:26px 0 8px;letter-spacing:.01em}
.login-hero p{color:rgba(255,255,255,.78);font-size:13px;line-height:1.7;margin:0}
.login-hero .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.login-hero .tags span{font-size:11.5px;border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:3px 10px}
.login-form{padding:38px 34px;display:flex;flex-direction:column;justify-content:center;gap:14px}
.login-form h2{font-size:17px;margin:0}
@media(max-width:760px){.login-card{grid-template-columns:1fr}.login-hero{display:none}
  .side{display:none}.main{padding:0 14px 40px}}