:root {
  --bg: #f3f5f9;
  --panel: #ffffff;
  --line: #e6eaf0;
  --text: #1f2937;
  --muted: #667085;
  --brand: #1d4ed8;
  --brand-2: #0ea5e9;
  --danger: #e11d48;
  --ok: #059669;
  --shadow: 0 10px 30px rgba(15, 23, 42, .06);
  --radius: 14px;
  --side: 230px;
  font-family: "Segoe UI", "Microsoft YaHei UI", sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: linear-gradient(160deg, #eef4ff 0%, #f7f8fb 40%, #f3f5f9 100%);
  color: var(--text);
}
a { color: var(--brand); text-decoration: none; }
.shell { display: flex; min-height: 100vh; }
.side {
  width: var(--side);
  background: #0f172a;
  color: #e2e8f0;
  padding: 22px 16px;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}
.brand {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .02em;
  margin-bottom: 24px;
  padding: 0 8px;
}
.brand span {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: #94a3b8;
  margin-top: 4px;
}
.side nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.side nav a {
  color: #cbd5e1;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
}
.side nav a:hover, .side nav a.active {
  background: rgba(37, 99, 235, .22);
  color: #fff;
}
.side-foot {
  border-top: 1px solid rgba(148,163,184,.2);
  padding-top: 14px;
  font-size: 13px;
  color: #94a3b8;
  display: flex;
  justify-content: space-between;
  gap: 8px;
}
.main { flex: 1; padding: 24px 28px 40px; min-width: 0; }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.top h1 { margin: 0; font-size: 24px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin-bottom: 16px;
}
.grid-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.stat {
  background: linear-gradient(135deg, #fff, #f8fbff);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}
.stat .n { font-size: 28px; font-weight: 800; color: var(--brand); }
.stat .l { color: var(--muted); font-size: 13px; margin-top: 4px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  border-radius: 10px;
  padding: 9px 14px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  font-size: 13px;
}
.btn:hover { filter: brightness(1.05); }
.btn.ghost {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--line);
}
.btn.danger { background: var(--danger); }
.btn.sm { padding: 6px 10px; font-size: 12px; }
table { width: 100%; border-collapse: collapse; }
th, td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  vertical-align: top;
}
th { color: var(--muted); font-weight: 600; background: #fafbfc; }
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.form-grid .full { grid-column: 1 / -1; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input[type=text], input[type=password], input[type=number], input[type=url], select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}
textarea { min-height: 90px; resize: vertical; }
.checks { display: flex; flex-wrap: wrap; gap: 10px 16px; }
.checks label { display: inline-flex; align-items: center; gap: 6px; color: var(--text); margin: 0; }
.flash {
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 14px;
  font-size: 14px;
}
.flash.ok { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.flash.err { background: #fff1f2; color: #9f1239; border: 1px solid #fecdd3; }
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(420px, 100%);
  background: #fff;
  border-radius: 18px;
  padding: 28px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.login-card h1 { margin: 0 0 6px; font-size: 24px; }
.login-card p { margin: 0 0 20px; color: var(--muted); }
.muted { color: var(--muted); font-size: 13px; }
.row-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.cover-preview {
  width: 120px;
  height: 76px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #eef2ff;
}
.drag-hint { color: var(--muted); font-size: 12px; margin-bottom: 8px; }
.sortable-row { cursor: grab; }
.sortable-row.dragging { opacity: .55; background: #eff6ff; }
.pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 12px;
}
@media (max-width: 980px) {
  .grid-stats, .form-grid { grid-template-columns: 1fr; }
  .shell { flex-direction: column; }
  .side { width: 100%; height: auto; position: relative; }
}