/* AI Gateway — design system (light, professional) */
:root {
  --color-bg: #f0f2f5;
  --color-surface: #ffffff;
  --color-border: #e4e7ec;
  --color-text: #101828;
  --color-text-secondary: #475467;
  --color-text-muted: #667085;
  --color-primary: #155eef;
  --color-primary-hover: #1248cc;
  --color-success: #067647;
  --color-danger: #d92d20;
  --color-warning: #dc6803;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08);
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --topbar-h: 56px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}
a:hover {
  text-decoration: underline;
  color: var(--color-primary-hover);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: #f2f4f7;
  padding: 2px 6px;
  border-radius: 4px;
}

/* —— Top bar —— */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
  text-decoration: none;
}
.topbar__brand:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.topbar__start {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 0;
}

.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  color: var(--color-text);
}

.mobile-nav-toggle:hover {
  background: #f2f4f7;
}

.mobile-nav-toggle__bar {
  display: block;
  height: 2px;
  width: 20px;
  border-radius: 1px;
  background: currentColor;
  margin: 0 auto;
}

.dashboard-page .mobile-nav-toggle {
  display: none;
}

@media (max-width: 900px) {
  .dashboard-page .mobile-nav-toggle {
    display: inline-flex;
  }

  .dashboard-page .topbar {
    z-index: 100;
  }
}

.topbar__logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary), #7c3aed);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
}

.topbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.topbar__nav a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}
.topbar__nav a:hover {
  color: var(--color-primary);
}

.topbar__nav a.is-active {
  color: var(--color-primary);
}

/* —— Layout —— */
.main {
  padding: var(--space-lg) var(--space-md) var(--space-xl);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
}

.container--narrow {
  max-width: 440px;
}

.page-title {
  margin: 0 0 var(--space-sm);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-subtitle {
  margin: 0 0 var(--space-lg);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.footer {
  text-align: center;
  padding: var(--space-lg);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

/* —— Cards —— */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-sm);
}

.card__title {
  margin: 0 0 var(--space-md);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
}

.card__desc {
  margin: calc(-1 * var(--space-sm)) 0 var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* —— Forms —— */
.field {
  margin-bottom: var(--space-md);
}

.field label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.field .hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 0.9375rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(21, 94, 239, 0.12);
}

textarea {
  min-height: 120px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.45;
}

/* —— Buttons —— */
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

button:disabled,
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: #fff;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover:not(:disabled) {
  background: #f9fafb;
  border-color: #d0d5dd;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}
.btn-ghost:hover:not(:disabled) {
  background: #f2f4f7;
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}
.btn-danger:hover:not(:disabled) {
  filter: brightness(0.95);
}

.btn-block {
  width: 100%;
}

/* —— Alerts —— */
.alert {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
  display: none;
}
.alert.is-visible {
  display: block;
}
.alert--error {
  background: #fef3f2;
  border: 1px solid #fecdca;
  color: #b42318;
}
.alert--success {
  background: #ecfdf3;
  border: 1px solid #abefc6;
  color: var(--color-success);
}
.alert--info {
  background: #eff8ff;
  border: 1px solid #b2ddff;
  color: #175cd3;
}

/* —— Metrics —— */
.metric-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.metric {
  background: #f9fafb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}
.metric__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.metric__value {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--space-xs);
}

/* —— Tables —— */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-top: var(--space-sm);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background: #f9fafb;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover {
  background: #fcfcfd;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
}
.badge--ok {
  background: #ecfdf3;
  color: var(--color-success);
}
.badge--fail {
  background: #fef3f2;
  color: var(--color-danger);
}
.badge--muted {
  background: #f2f4f7;
  color: var(--color-text-muted);
}

/* —— Code / JSON —— */
.code-block {
  margin-top: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.code-block__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: #f9fafb;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.code-block pre {
  margin: 0;
  padding: var(--space-md);
  background: #0c111d;
  color: #e4e7ec;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  overflow: auto;
  max-height: 320px;
}

.empty-state {
  padding: var(--space-lg);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.empty-state--rich {
  padding: var(--space-xl) var(--space-lg);
  max-width: 400px;
  margin: 0 auto;
}

.empty-state__icon {
  font-size: 2.5rem;
  line-height: 1;
  margin-bottom: var(--space-md);
  filter: grayscale(0.15);
}

.empty-state__title {
  margin: 0 0 var(--space-sm);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

.empty-state__hint {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* —— Landing —— */
.hero {
  text-align: center;
  padding: var(--space-xl) 0;
  max-width: 640px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 1.875rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-md);
}

.hero p {
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-lg);
  font-size: 1rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.feature {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.feature h3 {
  margin: 0 0 var(--space-sm);
  font-size: 1rem;
}

.feature p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  margin-top: var(--space-lg);
}

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    height: auto;
    padding: var(--space-md);
    gap: var(--space-sm);
    align-items: flex-start;
  }
}

/* —— App shell (dashboard) —— */
.app-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 0;
  max-width: 1400px;
  margin: 0 auto;
  min-height: calc(100vh - var(--topbar-h) - 48px);
  align-items: start;
}

.sidebar {
  position: sticky;
  top: var(--topbar-h);
  align-self: start;
  padding: var(--space-lg) var(--space-md);
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  min-height: calc(100vh - var(--topbar-h) - 32px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-md);
}

.sidebar__label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #94a3b8;
  margin: 0 0 var(--space-sm) var(--space-sm);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar__nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: #cbd5e1;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.sidebar__nav a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  text-decoration: none;
}

.sidebar__nav a.is-active {
  background: rgba(21, 94, 239, 0.35);
  color: #fff;
}

.sidebar__icon {
  width: 1.25rem;
  text-align: center;
  opacity: 0.9;
  font-size: 1rem;
}

.app-shell__main {
  padding: var(--space-lg) var(--space-lg) var(--space-xl);
  min-width: 0;
}

.page-head {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.page-head__breadcrumb {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 var(--space-xs);
}

.page-head__title {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.page-head__meta {
  margin: var(--space-sm) 0 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
}

.user-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 8px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-sm);
}

.user-pill__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 3px rgba(6, 118, 71, 0.2);
}

.user-pill #userEmail {
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section-anchor {
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.stat-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.stat-card--a::before {
  background: linear-gradient(90deg, #155eef, #7c3aed);
}
.stat-card--b::before {
  background: linear-gradient(90deg, #067647, #14b8a6);
}
.stat-card--c::before {
  background: linear-gradient(90deg, #dc6803, #f97316);
}
.stat-card--d::before {
  background: linear-gradient(90deg, #475467, #667085);
}

.stat-card--balance::before {
  background: linear-gradient(90deg, #059669, #14b8a6);
}

.stat-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-card__value {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: var(--space-sm);
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.stat-card__hint {
  margin-top: var(--space-xs);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.card--section {
  margin-bottom: var(--space-lg);
}

.card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.card__head .card__title {
  margin: 0;
}

/* —— Landing upgrade —— */
.landing-bg {
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(21, 94, 239, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(124, 58, 237, 0.08), transparent),
    var(--color-bg);
}

.landing-hero {
  padding: var(--space-xl) 0 var(--space-xl);
}

.landing-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(21, 94, 239, 0.08);
  border: 1px solid rgba(21, 94, 239, 0.2);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #175cd3;
  margin-bottom: var(--space-md);
}

.landing-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
  max-width: 720px;
}

.landing-hero .lead {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 0 var(--space-lg);
  line-height: 1.6;
}

.feature--rich {
  position: relative;
  padding-top: var(--space-xl);
}

.feature__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, rgba(21, 94, 239, 0.12), rgba(124, 58, 237, 0.08));
  border: 1px solid var(--color-border);
}

/* —— Auth layout —— */
.auth-layout {
  display: grid;
  grid-template-columns: 1fr minmax(320px, 420px) 1fr;
  align-items: start;
  padding: var(--space-xl) var(--space-md);
  min-height: calc(100vh - var(--topbar-h) - 80px);
}

.auth-panel {
  grid-column: 2;
}

.auth-aside {
  display: none;
}

@media (max-width: 959px) {
  .auth-layout {
    grid-template-columns: 1fr;
    padding: var(--space-md);
    min-height: auto;
  }
  .auth-panel {
    grid-column: 1;
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
  }
}

@media (min-width: 960px) {
  .auth-layout {
    grid-template-columns: minmax(280px, 1fr) minmax(360px, 440px) minmax(0, 1fr);
    max-width: 1200px;
    margin: 0 auto;
    gap: var(--space-xl);
    align-items: stretch;
  }
  .auth-panel {
    grid-column: 2;
  }
  .auth-aside {
    display: flex;
    grid-column: 1;
    grid-row: 1;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-xl);
    background: linear-gradient(145deg, #0f172a 0%, #1e3a5f 50%, #312e81 100%);
    border-radius: var(--radius-lg);
    color: #e2e8f0;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-md);
  }
  .auth-aside h2 {
    margin: 0 0 var(--space-md);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #fff;
  }
  .auth-aside p {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.65;
    color: #94a3b8;
  }
  .auth-aside__dots {
    display: flex;
    gap: 8px;
    margin-top: var(--space-lg);
  }
  .auth-aside__dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
  }
  .auth-aside__dots span:first-child {
    background: #60a5fa;
  }
}

/* —— Loading —— */
.btn.is-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn.is-loading::after {
  content: "";
  position: absolute;
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.btn-secondary.is-loading::after {
  border-color: rgba(16, 24, 40, 0.2);
  border-top-color: var(--color-primary);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.skeleton {
  background: linear-gradient(90deg, #f2f4f7 25%, #e4e7ec 50%, #f2f4f7 75%);
  background-size: 200% 100%;
  animation: shimmer 1.2s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .dashboard-page .sidebar {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    bottom: 0;
    width: min(288px, 88vw);
    max-width: 100%;
    margin: 0;
    padding: var(--space-md) var(--space-md) var(--space-lg);
    border-radius: 0;
    z-index: 60;
    transform: translateX(-105%);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.2);
    min-height: calc(100vh - var(--topbar-h));
    max-height: calc(100vh - var(--topbar-h));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .dashboard-page .app-shell--nav-open .sidebar {
    transform: translateX(0);
  }

  .dashboard-page .sidebar__nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .dashboard-page .sidebar__label {
    width: auto;
  }

  .app-shell__main {
    padding: var(--space-md);
  }
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  top: var(--topbar-h);
  z-index: 55;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.sidebar-backdrop--visible {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
}

/* —— Theme toggle —— */
.theme-toggle {
  font-size: 0.8125rem !important;
  padding: 6px 10px !important;
}

/* —— API endpoint copy rows —— */
.endpoint-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.endpoint-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: #f9fafb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.endpoint-row__label {
  flex: 0 0 88px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.endpoint-row__code {
  flex: 1 1 200px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  word-break: break-all;
  color: var(--color-text);
}

.btn--sm,
.btn-sm {
  padding: 6px 12px !important;
  font-size: 0.8125rem !important;
}

.toast {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  z-index: 1000;
  padding: 10px 20px;
  background: var(--color-text);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
  pointer-events: none;
}

.toast.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* —— Dark theme —— */
[data-theme="dark"] {
  --color-bg: #0c111d;
  --color-surface: #141c2c;
  --color-border: #2d3a4f;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-primary: #5b8cff;
  --color-primary-hover: #7c9fff;
  --color-success: #34d399;
  --color-danger: #f87171;
  --color-warning: #fbbf24;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
}

[data-theme="dark"] body.landing-bg {
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(91, 140, 255, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(124, 58, 237, 0.06), transparent),
    var(--color-bg);
}

[data-theme="dark"] .topbar {
  background: var(--color-surface);
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .user-pill {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] select,
[data-theme="dark"] textarea {
  background: #0f172a;
  border-color: var(--color-border);
  color: var(--color-text);
}

[data-theme="dark"] .card,
[data-theme="dark"] .feature,
[data-theme="dark"] .metric,
[data-theme="dark"] .stat-card {
  background: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .data-table th {
  background: #1a2336;
}

[data-theme="dark"] .data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

[data-theme="dark"] .code-block pre {
  background: #070b12;
  border-top-color: var(--color-border);
}

[data-theme="dark"] .code-block__head {
  background: #1a2336;
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .endpoint-row {
  background: #1a2336;
  border-color: var(--color-border);
}

[data-theme="dark"] code {
  background: #1a2336;
  color: #e2e8f0;
}

[data-theme="dark"] .skeleton {
  background: linear-gradient(90deg, #1a2336 25%, #243045 50%, #1a2336 75%);
  background-size: 200% 100%;
}

[data-theme="dark"] .alert--error {
  background: rgba(248, 113, 113, 0.12);
  border-color: rgba(248, 113, 113, 0.35);
  color: #fecaca;
}

[data-theme="dark"] .alert--success {
  background: rgba(52, 211, 153, 0.12);
  border-color: rgba(52, 211, 153, 0.35);
  color: #a7f3d0;
}

[data-theme="dark"] .alert--info {
  background: rgba(91, 140, 255, 0.12);
  border-color: rgba(91, 140, 255, 0.35);
  color: #bfdbfe;
}

[data-theme="dark"] .btn-secondary {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

[data-theme="dark"] .btn-secondary:hover:not(:disabled) {
  background: #1e293b;
}

[data-theme="dark"] .btn-ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .sidebar {
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .page-head {
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .footer {
  border-top-color: var(--color-border);
  color: var(--color-text-muted);
}

[data-theme="dark"] .toast {
  background: #e2e8f0;
  color: #0f172a;
}

[data-theme="dark"] .mobile-nav-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .sidebar-backdrop {
  background: rgba(0, 0, 0, 0.55);
}

/* —— Playground (在线调试) —— */
.playground-grid {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-sm);
}

@media (min-width: 900px) {
  .playground-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .playground-col--response {
    position: sticky;
    top: calc(var(--topbar-h) + var(--space-md));
  }
}

.playground-model-select {
  max-width: 100%;
}

.playground-model-summary {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  background: #f8fafc;
  border: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

[data-theme="dark"] .playground-model-summary {
  background: rgba(15, 23, 42, 0.55);
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

.playground-model-summary[hidden] {
  display: none !important;
}

.playground-model-summary__fallback {
  margin: 0;
  line-height: 1.55;
}

.playground-model-summary__fallback code {
  font-size: 0.8em;
}

.playground-model-summary__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.playground-model-summary__row:last-child {
  margin-bottom: 0;
}

.playground-chip {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: #e0e7ff;
  color: #3730a3;
}

[data-theme="dark"] .playground-chip {
  background: rgba(99, 102, 241, 0.25);
  color: #c7d2fe;
}

.playground-chip--muted {
  background: #f2f4f7;
  color: var(--color-text-secondary);
  font-weight: 500;
}

[data-theme="dark"] .playground-chip--muted {
  background: rgba(148, 163, 184, 0.15);
  color: #cbd5e1;
}

.playground-chip--ok {
  background: #d1fadf;
  color: var(--color-success);
}

[data-theme="dark"] .playground-chip--ok {
  background: rgba(6, 118, 71, 0.25);
  color: #86efac;
}

.playground-pricing {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  align-items: baseline;
}

.playground-pricing dt {
  margin: 0;
  font-weight: 500;
  color: var(--color-text-muted);
}

.playground-pricing dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text);
}

.playground-capbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  align-items: center;
}

.playground-capbar__btn {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 8px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}

.playground-capbar__btn:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
}

.playground-capbar__btn.is-active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

[data-theme="dark"] .playground-capbar__btn {
  background: rgba(15, 23, 42, 0.8);
  border-color: var(--color-border);
  color: var(--color-text-muted);
}

[data-theme="dark"] .playground-capbar__btn:hover {
  color: #e2e8f0;
}

[data-theme="dark"] .playground-capbar__btn.is-active {
  background: #3b82f6;
  border-color: #3b82f6;
  color: #fff;
}

.playground-mode {
  display: inline-flex;
  padding: 3px;
  margin-bottom: var(--space-md);
  border-radius: var(--radius-md);
  background: #f2f4f7;
  border: 1px solid var(--color-border);
  gap: 2px;
}

[data-theme="dark"] .playground-mode {
  background: rgba(15, 23, 42, 0.6);
  border-color: var(--color-border);
}

.playground-mode__btn {
  border: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}

.playground-mode__btn:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.65);
}

[data-theme="dark"] .playground-mode__btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #e2e8f0;
}

.playground-mode__btn.is-active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .playground-mode__btn.is-active {
  background: #1e293b;
  color: #93c5fd;
  box-shadow: none;
}

.playground-chat-input {
  min-height: 120px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.55;
}

.playground-advanced-fields {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px dashed var(--color-border);
}

.playground-advanced-fields__label {
  margin: 0 0 var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: none;
  letter-spacing: 0;
}

.playground-inline-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (max-width: 520px) {
  .playground-inline-fields {
    grid-template-columns: 1fr;
  }
}

.playground-inline-fields .field {
  margin-bottom: 0;
}

.playground-inline-fields .field label {
  font-size: 0.75rem;
}

.playground-response-head {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.playground-response-body {
  min-height: 200px;
  max-height: min(52vh, 520px);
  overflow: auto;
  margin: 0;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: #1a1d24;
  color: #e8eaed;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  border: 1px solid #2d3139;
  white-space: pre-wrap;
  word-break: break-word;
}

.playground-response-body--empty {
  color: #9aa0ae;
}

[data-theme="dark"] .playground-response-body {
  background: #0b0d11;
  border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .playground-response-body--empty {
  color: #64748b;
}

.playground-image-preview {
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid #2d3139;
  background: #1a1d24;
}

.playground-image-preview img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

[data-theme="dark"] .playground-image-preview {
  background: #0b0d11;
  border-color: rgba(255, 255, 255, 0.08);
}