:root {
  --background: #f8fafc;
  --foreground: #0f172a;
  --card: #ffffff;
  --muted: #64748b;
  --muted-bg: #f1f5f9;
  --border: #e2e8f0;
  --primary: #111827;
  --primary-foreground: #ffffff;
  --accent: #0f766e;
  --destructive: #dc2626;
  --warning: #b45309;
  --success: #15803d;
  --ring: rgba(15, 23, 42, .12);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--foreground);
  background: var(--background);
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--border);
  background: var(--card);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px 12px;
  border-bottom: 1px solid var(--border);
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: var(--primary-foreground);
  background: var(--primary);
  font-weight: 800;
}
.brand-title { font-weight: 700; line-height: 1.2; }
.brand-subtitle { color: var(--muted); font-size: 12px; margin-top: 2px; }
.nav { display: flex; flex-direction: column; gap: 6px; }
.nav button {
  width: 100%;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #334155;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  text-align: left;
}
.nav button:hover, .nav button.active { background: var(--muted-bg); color: var(--foreground); }
.sidebar-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 14px 8px 0;
  color: var(--muted);
  font-size: 12px;
}
.main {
  min-width: 0;
  padding: 22px 28px 40px;
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}
.page-title h1 { margin: 0; font-size: 24px; letter-spacing: 0; }
.page-title p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.btn {
  min-height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--foreground);
  padding: 8px 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 500;
  text-decoration: none;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-foreground); }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.danger { color: var(--destructive); }
.btn:focus-visible, .field input:focus, .field select:focus, .field textarea:focus {
  outline: 3px solid var(--ring);
  border-color: #94a3b8;
}
.grid { display: grid; gap: 16px; }
.grid.cards { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.two { grid-template-columns: 1.2fr .8fr; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
}
.card-header {
  padding: 16px 18px 8px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.card-title { margin: 0; font-size: 15px; font-weight: 650; }
.card-description { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
.card-content { padding: 14px 18px 18px; }
.metric { color: var(--muted); font-size: 13px; }
.metric strong {
  display: block;
  color: var(--foreground);
  font-size: 28px;
  margin-top: 8px;
  letter-spacing: 0;
}
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--border);
  padding: 3px 8px;
  font-size: 12px;
  color: #334155;
  background: #f8fafc;
  white-space: nowrap;
}
.badge.active { color: var(--success); background: #f0fdf4; border-color: #bbf7d0; }
.badge.paused, .badge.draft { color: var(--warning); background: #fffbeb; border-color: #fde68a; }
.badge.rejected { color: var(--destructive); background: #fef2f2; border-color: #fecaca; }
.table-wrap { overflow: auto; }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; font-size: 13px; vertical-align: middle; }
th { color: var(--muted); font-weight: 600; background: #fbfdff; }
tr:last-child td { border-bottom: 0; }
.ad-cell { display: flex; align-items: center; gap: 10px; min-width: 220px; }
.ad-thumb { width: 58px; height: 38px; border-radius: 6px; object-fit: cover; background: var(--muted-bg); border: 1px solid var(--border); }
.muted { color: var(--muted); }
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.field-group { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 13px; font-weight: 600; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  min-height: 38px;
  padding: 8px 10px;
  color: var(--foreground);
}
.field textarea { min-height: 76px; resize: vertical; }
.login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at top left, rgba(20, 184, 166, .12), transparent 34%),
    radial-gradient(circle at bottom right, rgba(15, 23, 42, .08), transparent 32%),
    var(--background);
}
.login-card { width: min(420px, 100%); }
.notice {
  border: 1px solid var(--border);
  background: var(--muted-bg);
  border-radius: 8px;
  padding: 12px;
  color: #334155;
  font-size: 13px;
}
.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  background: var(--primary);
  color: var(--primary-foreground);
  border-radius: 8px;
  padding: 12px 14px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, .22);
  z-index: 20;
}
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .45);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 10;
}
.modal { width: min(760px, 100%); max-height: 90vh; overflow: auto; }
.chart-bars { display: flex; flex-direction: column; gap: 10px; }
.bar-row { display: grid; grid-template-columns: 120px 1fr 70px; align-items: center; gap: 10px; font-size: 13px; }
.bar { height: 10px; background: var(--muted-bg); border-radius: 999px; overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--accent); border-radius: inherit; }
.empty { padding: 30px; text-align: center; color: var(--muted); }
.mobile-menu { display: none; }

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .main { padding: 18px; }
  .grid.cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.two { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .grid.cards, .field-group { grid-template-columns: 1fr; }
  .nav { grid-template-columns: 1fr; }
  .metric strong { font-size: 24px; }
}