:root {
  --bg: #f5f6fa;
  --card: #ffffff;
  --text: #1f2329;
  --muted: #8a919f;
  --border: #e4e7ed;
  --primary: #3478f6;
  --primary-hover: #2b66d9;
  --danger: #e5484d;
  --sidebar: #1e222a;
  --sidebar-text: #aab2c0;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --card: #1f232b;
    --text: #e8eaef;
    --muted: #8a919f;
    --border: #2c313a;
    --sidebar: #111318;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font: 14px/1.6 "Segoe UI", "Microsoft YaHei", -apple-system, "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 13px; }
code { background: rgba(128,128,128,.15); padding: 1px 5px; border-radius: 4px; }

/* ── 登录页 ── */
.login-wrap { display: flex; align-items: center; justify-content: center; height: 100vh; }
.login-card {
  width: 360px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; box-shadow: 0 8px 30px rgba(0,0,0,.08);
}
.login-card h1 { margin: 0 0 4px; font-size: 20px; }
.login-card p { margin: 0 0 20px; }

/* ── 布局 ── */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; flex-shrink: 0; background: var(--sidebar); color: var(--sidebar-text);
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
}
.brand { padding: 22px 20px 16px; font-size: 17px; font-weight: 700; color: #fff; letter-spacing: .5px; }
.brand span { display: block; font-size: 12px; font-weight: 400; color: var(--sidebar-text); }
nav { flex: 1; padding: 8px; }
.nav-item {
  display: block; padding: 10px 14px; margin: 2px 0; border-radius: 8px;
  color: var(--sidebar-text); text-decoration: none; transition: background .15s, color .15s;
}
.nav-item:hover { background: rgba(255,255,255,.06); color: #fff; }
.nav-item.active { background: var(--primary); color: #fff; }
.sidebar-footer { padding: 16px; border-top: 1px solid rgba(255,255,255,.08); }
.sidebar-footer .muted { margin-bottom: 8px; }

.content { flex: 1; padding: 28px 36px; max-width: 980px; }
.page h2 { margin: 0 0 16px; font-size: 20px; }
.page h3 { margin: 12px 0 8px; font-size: 15px; }

/* ── 卡片与表单 ── */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 24px; margin-bottom: 16px;
}
.card.narrow { max-width: 420px; }
label { display: block; margin: 12px 0; font-weight: 500; }
input[type=text], input[type=password], input[type=number], input[type=date],
input:not([type]), textarea {
  width: 100%; margin-top: 6px; padding: 9px 12px; font: inherit;
  color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; outline: none; transition: border-color .15s;
}
input:focus, textarea:focus { border-color: var(--primary); }
textarea { resize: vertical; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
@media (max-width: 720px) { .grid-2 { grid-template-columns: 1fr; } }

/* ── 开关行 ── */
.switch-row {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 10px 0; border-bottom: 1px dashed var(--border);
}
.switch-row:last-child { border-bottom: none; }
.switch-row small { display: block; font-weight: 400; color: var(--muted); }
.switch { appearance: none; width: 44px; height: 24px; flex-shrink: 0; cursor: pointer;
  background: var(--border); border-radius: 12px; position: relative; transition: background .2s; margin: 0; }
.switch::after { content: ""; position: absolute; top: 2px; left: 2px; width: 20px; height: 20px;
  background: #fff; border-radius: 50%; transition: left .2s; box-shadow: 0 1px 3px rgba(0,0,0,.25); }
.switch:checked { background: var(--primary); }
.switch:checked::after { left: 22px; }

/* ── 按钮 ── */
.btn {
  padding: 9px 20px; font: inherit; font-weight: 500; cursor: pointer;
  color: var(--text); background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; transition: background .15s, opacity .15s;
}
.btn:hover { background: var(--bg); }
.btn.primary { color: #fff; background: var(--primary); border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-hover); }
.btn.ghost { width: 100%; color: var(--sidebar-text); background: transparent; border-color: rgba(255,255,255,.15); }
.btn.ghost:hover { color: #fff; background: rgba(255,255,255,.06); }
.btn.block { width: 100%; margin-top: 8px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.actions { margin: 4px 0 24px; }
.actions.inline { margin: 8px 0 0; }

/* ── 统计 ── */
.stats-query { display: flex; align-items: end; gap: 12px; margin-bottom: 16px; }
.stats-query label { margin: 0; }
.stats-query input { width: 180px; }
.stats-cards { display: flex; gap: 16px; margin-bottom: 8px; }
.stat-card { flex: 1; text-align: center; padding: 14px; background: var(--bg); border-radius: 8px; }
.stat-num { font-size: 28px; font-weight: 700; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.table th { color: var(--muted); font-weight: 500; font-size: 13px; }

/* ── 其它 ── */
.upload-row { display: flex; gap: 12px; align-items: center; margin: 12px 0; }
.error { color: var(--danger); margin: 8px 0; font-size: 13px; }
.toast {
  position: fixed; top: 20px; right: 24px; z-index: 99;
  padding: 11px 18px; border-radius: 8px; color: #fff; background: #2f9e44;
  box-shadow: 0 4px 16px rgba(0,0,0,.2); animation: fadein .2s;
}
.toast.err { background: var(--danger); }
@keyframes fadein { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; } }