:root {
  --brand-700: #1D4ED8;
  --brand-600: #2563EB;
  --brand-50: #EFF6FF;
  --success-600: #059669;
  --success-50: #ECFDF5;
  --commerce-600: #D97706;
  --commerce-50: #FFF7ED;
  --danger-600: #DC2626;
  --ink-950: #0F172A;
  --ink-700: #334155;
  --ink-500: #64748B;
  --surface: #FFFFFF;
  --canvas: #F8FAFC;
  --line: #E2E8F0;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, .10);
  --focus-ring: 0 0 0 3px rgba(37, 99, 235, .32);
  --sidebar-w: 240px;
  --topbar-h: 72px;
  --font: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 20px; --space-6: 24px; --space-7: 32px; --space-8: 40px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink-700);
  background: var(--canvas);
  font-size: 14px;
  line-height: 22px;
}
body.care-mode {
  font-size: 16px;
  line-height: 1.75;
}
body.care-mode .btn, body.care-mode .nav-item, body.care-mode .topic-chip {
  min-height: 48px;
}
a { color: var(--brand-600); text-decoration: none; }
a:hover { color: var(--brand-700); text-decoration: underline; }
img { max-width: 100%; display: block; }
:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--line);
  padding: var(--space-5) var(--space-4);
  position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column; gap: var(--space-2);
  flex-shrink: 0;
}
.brand {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3); margin-bottom: var(--space-4);
  color: var(--ink-950); text-decoration: none; font-weight: 700; font-size: 18px;
}
.brand:hover { text-decoration: none; color: var(--ink-950); }
.brand-mark {
  width: 32px; height: 32px; border-radius: 10px;
  background: linear-gradient(135deg, var(--brand-600), #3B82F6);
  display: grid; place-items: center; color: #fff; font-size: 14px; font-weight: 700;
}
.nav-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: 10px 12px; border-radius: var(--radius-md);
  color: var(--ink-700); text-decoration: none; min-height: 40px;
}
.nav-item:hover { background: var(--canvas); text-decoration: none; color: var(--ink-950); }
.nav-item.active { background: var(--brand-50); color: var(--brand-700); font-weight: 600; }
.nav-item svg { width: 20px; height: 20px; flex-shrink: 0; }
.sidebar-footer { margin-top: auto; padding-top: var(--space-4); border-top: 1px solid var(--line); }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  height: var(--topbar-h);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: var(--space-4);
  padding: 0 var(--space-6);
  position: sticky; top: 0; z-index: 20;
}
.topbar-search {
  flex: 1; max-width: 480px;
  display: flex; align-items: center; gap: var(--space-2);
  background: var(--canvas); border: 1px solid var(--line);
  border-radius: var(--radius-md); padding: 0 12px; height: 40px;
}
.topbar-search input {
  border: 0; background: transparent; width: 100%; font: inherit; color: var(--ink-950);
}
.topbar-search input:focus { outline: none; }
.topbar-actions { display: flex; align-items: center; gap: var(--space-3); margin-left: auto; }
.content { padding: var(--space-6); max-width: 1440px; width: 100%; margin: 0 auto; }

.page-title { font-size: 32px; line-height: 40px; font-weight: 700; color: var(--ink-950); margin: 0 0 var(--space-2); }
.page-sub { color: var(--ink-500); margin: 0 0 var(--space-6); }
.section-title { font-size: 20px; line-height: 28px; font-weight: 650; color: var(--ink-950); margin: 0 0 var(--space-4); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 40px; padding: 0 16px; border-radius: var(--radius-sm);
  border: 1px solid transparent; font: inherit; font-weight: 600; cursor: pointer;
  text-decoration: none; transition: background .15s, border-color .15s, transform .15s;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand-600); color: #fff; }
.btn-primary:hover { background: var(--brand-700); color: #fff; }
.btn-secondary { background: #fff; color: var(--brand-600); border-color: var(--brand-600); }
.btn-secondary:hover { background: var(--brand-50); color: var(--brand-700); }
.btn-ghost { background: transparent; color: var(--ink-700); border-color: var(--line); }
.btn-danger { background: var(--danger-600); color: #fff; }
.btn-sm { min-height: 32px; padding: 0 12px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); padding: var(--space-5);
}
.card-clickable:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; line-height: 18px;
}
.badge-brand { background: var(--brand-50); color: var(--brand-700); }
.badge-success { background: var(--success-50); color: var(--success-600); }
.badge-commerce { background: var(--commerce-50); color: var(--commerce-600); }
.badge-muted { background: #F1F5F9; color: var(--ink-500); }
.badge-danger { background: #FEF2F2; color: var(--danger-600); }

.flash {
  padding: 12px 16px; border-radius: var(--radius-md); margin-bottom: var(--space-4);
  border: 1px solid var(--line);
}
.flash-success { background: var(--success-50); border-color: #A7F3D0; color: #065F46; }
.flash-error { background: #FEF2F2; border-color: #FECACA; color: #991B1B; }
.flash-info { background: var(--brand-50); border-color: #BFDBFE; color: #1E3A8A; }

.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(280px, 1fr)); gap: var(--space-5); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.layout-discover { display: grid; grid-template-columns: 1fr 280px; gap: var(--space-6); }
.layout-campaign { display: grid; grid-template-columns: 5fr 7fr; gap: var(--space-6); }

.topic-bar { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); }
.topic-chip {
  display: inline-flex; align-items: center; min-height: 36px; padding: 0 14px;
  border-radius: 999px; border: 1px solid var(--line); background: #fff;
  color: var(--ink-700); text-decoration: none; font-weight: 500;
}
.topic-chip:hover { background: var(--brand-50); text-decoration: none; }
.topic-chip.active { background: var(--brand-600); color: #fff; border-color: var(--brand-600); }

.content-card { overflow: hidden; padding: 0; display: flex; flex-direction: column; }
.content-card .cover {
  position: relative; aspect-ratio: 16 / 10; background: #E2E8F0; overflow: hidden;
}
.content-card .cover img { width: 100%; height: 100%; object-fit: cover; }
.cover-placeholder {
  width: 100%; height: 100%;
  display: flex; flex-direction: column; justify-content: flex-end; gap: 6px;
  padding: 16px; color: var(--ink-950);
  background:
    linear-gradient(160deg, rgba(37,99,235,.18), rgba(5,150,105,.10)),
    repeating-linear-gradient(-45deg, #F8FAFC, #F8FAFC 12px, #EFF6FF 12px, #EFF6FF 24px);
}
.cover-placeholder strong { font-size: 16px; line-height: 22px; }
.cover-placeholder span { font-size: 12px; color: var(--ink-500); }
.platform-chip {
  position: absolute; left: 12px; top: 12px;
  background: rgba(15,23,42,.72); color: #fff; padding: 4px 8px;
  border-radius: 8px; font-size: 12px; font-weight: 600;
}
.play-icon {
  position: absolute; right: 12px; top: 12px; width: 28px; height: 28px;
  border-radius: 50%; background: rgba(15,23,42,.7); color: #fff;
  display: grid; place-items: center; font-size: 12px;
}
.content-card .body { padding: var(--space-4); display: flex; flex-direction: column; gap: 8px; flex: 1; }
.content-card .title {
  margin: 0; font-size: 16px; line-height: 24px; font-weight: 600; color: var(--ink-950);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.meta-row { display: flex; align-items: center; gap: 8px; color: var(--ink-500); font-size: 12px; flex-wrap: wrap; }
.card-actions { display: flex; gap: 8px; margin-top: auto; padding-top: 8px; }

.metric-card .metric-value {
  font-size: 28px; line-height: 36px; font-weight: 700; color: var(--ink-950);
  font-variant-numeric: tabular-nums;
}
.metric-card .metric-label { color: var(--ink-500); margin-top: 4px; }
.metric-card .metric-hint { font-size: 12px; color: var(--ink-500); margin-top: 8px; }

.form-group { margin-bottom: var(--space-4); }
.form-label { display: block; font-weight: 600; color: var(--ink-950); margin-bottom: 8px; }
.form-hint { font-size: 12px; color: var(--ink-500); margin-top: 6px; }
.input, .select, .textarea {
  width: 100%; min-height: 40px; padding: 8px 12px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: #fff; font: inherit; color: var(--ink-950);
}
.textarea { min-height: 100px; resize: vertical; }
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--brand-600); box-shadow: var(--focus-ring); outline: none;
}
.checkbox-row { display: flex; flex-wrap: wrap; gap: 12px; }
.checkbox-row label { display: inline-flex; align-items: center; gap: 6px; }

.stepper { display: flex; gap: 8px; margin-bottom: var(--space-6); flex-wrap: wrap; }
.step {
  flex: 1; min-width: 120px; padding: 12px; border-radius: var(--radius-md);
  border: 1px solid var(--line); background: #fff; color: var(--ink-500); font-weight: 600;
}
.step.active { border-color: var(--brand-600); background: var(--brand-50); color: var(--brand-700); }
.step.done { border-color: #A7F3D0; background: var(--success-50); color: var(--success-600); }

.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { color: var(--ink-500); font-weight: 600; font-size: 12px; }

.profile-hero {
  position: relative; border-radius: var(--radius-xl); overflow: hidden;
  background: var(--surface); border: 1px solid var(--line); margin-bottom: var(--space-6);
}
.profile-cover { height: 180px; background: linear-gradient(120deg, #DBEAFE, #F0FDFA); }
.profile-cover img { width: 100%; height: 100%; object-fit: cover; }
.profile-body { padding: var(--space-5) var(--space-6) var(--space-6); display: flex; gap: var(--space-5); align-items: flex-end; }
.avatar {
  width: 88px; height: 88px; border-radius: 20px; border: 3px solid #fff;
  margin-top: -52px; object-fit: cover; background: #CBD5E1;
}
.tabs { display: flex; gap: 8px; border-bottom: 1px solid var(--line); margin-bottom: var(--space-5); }
.tab {
  padding: 12px 16px; color: var(--ink-500); text-decoration: none; font-weight: 600;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tab.active { color: var(--brand-700); border-bottom-color: var(--brand-600); }

.mobile-tabbar {
  display: none; position: fixed; left: 0; right: 0; bottom: 0; height: calc(64px + env(safe-area-inset-bottom));
  background: #fff; border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom); z-index: 40;
}
.mobile-tabbar a {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; color: var(--ink-500); text-decoration: none; font-size: 12px; min-height: 44px;
}
.mobile-tabbar a.active { color: var(--brand-600); font-weight: 600; }

.auth-wrap {
  min-height: 100vh; display: grid; place-items: center; padding: 24px;
  background:
    radial-gradient(circle at 20% 20%, rgba(37,99,235,.12), transparent 40%),
    radial-gradient(circle at 80% 0%, rgba(5,150,105,.10), transparent 35%),
    var(--canvas);
}
.auth-card { width: 100%; max-width: 420px; }

.fee-row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); }
.fee-row.total { font-weight: 700; color: var(--commerce-600); border-bottom: 0; font-variant-numeric: tabular-nums; }
.empty { padding: 40px; text-align: center; color: var(--ink-500); }

.commerce-banner {
  background: var(--commerce-50); border: 1px solid #FDBA74; color: #9A3412;
  border-radius: var(--radius-md); padding: 12px 16px; margin-bottom: var(--space-5);
}

@media (max-width: 1279px) {
  .sidebar { width: 72px; padding: var(--space-4) var(--space-2); }
  .sidebar .brand-text, .sidebar .nav-text, .sidebar-footer .user-meta { display: none; }
  .brand { justify-content: center; }
  .nav-item { justify-content: center; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .layout-campaign { grid-template-columns: 1fr; }
}
@media (max-width: 1023px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .layout-discover { grid-template-columns: 1fr; }
  .trend-rail { display: none; }
}
@media (max-width: 767px) {
  .app-shell.with-mobile-nav .sidebar, .app-shell.with-mobile-nav .topbar { display: none; }
  .app-shell.with-mobile-nav .mobile-tabbar { display: flex; }
  .app-shell.with-mobile-nav .content { padding: 16px 16px 96px; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .page-title { font-size: 28px; line-height: 36px; }
  .mobile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .mobile-hero { margin-bottom: 16px; }
  .mobile-hero .cover { aspect-ratio: 16/11; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}