:root {
  --ob-color-canvas: #f4f6f8;
  --ob-color-surface: #ffffff;
  --ob-color-surface-muted: #edf1f5;
  --ob-color-border: #d8e0ea;
  --ob-color-text: #17202b;
  --ob-color-muted: #657386;
  --ob-color-accent: #2563eb;
  --ob-color-accent-soft: #dbe8ff;
  --ob-color-success: #16865a;
  --ob-color-warning: #b7791f;
  --ob-color-danger: #c2413a;
  --ob-color-info: #0f7ea8;
  --ob-color-action-primary: #17202b;
  --ob-color-on-action-primary: #ffffff;
  --ob-color-status-success: #16865a;
  --ob-color-status-warning: #b7791f;
  --ob-color-status-danger: #c2413a;
  --ob-status-success-bg: #e6f6ef;
  --ob-status-success-fg: #16865a;
  --ob-status-warning-bg: #fff3d8;
  --ob-status-warning-fg: #b7791f;
  --ob-status-danger-bg: #fde8e7;
  --ob-status-danger-fg: #c2413a;
  --ob-font-ui: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --ob-font-mono: "SFMono-Regular", "Fira Code", Consolas, monospace;
  --ob-space-xs: 4px;
  --ob-space-sm: 8px;
  --ob-space-md: 12px;
  --ob-space-lg: 16px;
  --ob-space-xl: 24px;
  --ob-space-xxl: 36px;
  --ob-radius-control: 6px;
  --ob-radius-card: 8px;
  --ob-radius-panel: 8px;
  --ob-radius-pill: 999px;
  --ob-shadow-panel: 0 12px 30px rgba(23, 32, 43, 0.08);
}

.ob-theme-dark,
[data-ob-theme="dark"] {
  --ob-color-canvas: #070b12;
  --ob-color-surface: #101722;
  --ob-color-surface-muted: #172232;
  --ob-color-border: #263244;
  --ob-color-text: #edf4fb;
  --ob-color-muted: #9aa8ba;
  --ob-color-accent: #75a7ff;
  --ob-color-accent-soft: #132544;
  --ob-color-action-primary: #75a7ff;
  --ob-color-on-action-primary: #06101d;
  --ob-color-status-success: #5ed6a3;
  --ob-color-status-warning: #f6c667;
  --ob-color-status-danger: #f08a84;
  --ob-status-success-bg: #0d2c22;
  --ob-status-success-fg: #5ed6a3;
  --ob-status-warning-bg: #31230a;
  --ob-status-warning-fg: #f6c667;
  --ob-status-danger-bg: #351719;
  --ob-status-danger-fg: #f08a84;
  --ob-shadow-panel: 0 18px 42px rgba(0, 0, 0, 0.28);
}

.ob-app {
  min-height: 100vh;
  margin: 0;
  background: var(--ob-color-canvas);
  color: var(--ob-color-text);
  font-family: var(--ob-font-ui);
  letter-spacing: 0;
  line-height: 1.5;
}

.ob-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: var(--ob-space-xxl) 0;
}

.ob-page-hero {
  display: grid;
  gap: var(--ob-space-lg);
  padding: var(--ob-space-xxl) 0 var(--ob-space-xl);
}

.ob-page-hero h1 {
  max-width: 860px;
  margin: 0;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.03;
  letter-spacing: 0;
}

.ob-page-hero p {
  max-width: 720px;
  margin: 0;
  color: var(--ob-color-muted);
  font-size: 17px;
}

.ob-eyebrow {
  margin: 0;
  color: var(--ob-color-accent);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.ob-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--ob-space-lg);
}

.ob-card {
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius-card);
  background: var(--ob-color-surface);
  box-shadow: var(--ob-shadow-panel);
  padding: var(--ob-space-xl);
}

.ob-card h2,
.ob-card h3 {
  margin: 0 0 var(--ob-space-sm);
  line-height: 1.2;
  letter-spacing: 0;
}

.ob-card p {
  margin: 0;
  color: var(--ob-color-muted);
}

.ob-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--ob-space-lg);
}

.ob-stat-card {
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius-card);
  background: var(--ob-color-surface);
  box-shadow: var(--ob-shadow-panel);
  padding: var(--ob-space-lg);
}

.ob-stat-label,
.ob-stat-help {
  color: var(--ob-color-muted);
  font-size: 13px;
}

.ob-stat-value {
  display: block;
  margin: 6px 0;
  color: var(--ob-color-text);
  font-size: 26px;
  font-weight: 850;
  line-height: 1.1;
}

.ob-button {
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius-control);
  background: var(--ob-color-surface);
  color: var(--ob-color-text);
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: var(--ob-space-sm);
  padding: 7px 13px;
  font: inherit;
  font-weight: 800;
  letter-spacing: 0;
  text-decoration: none;
  cursor: pointer;
}

.ob-button-primary {
  border-color: var(--ob-color-action-primary);
  background: var(--ob-color-action-primary);
  color: var(--ob-color-on-action-primary);
}

.ob-preference-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--ob-space-sm);
}

.ob-theme-switch,
.ob-language-switch {
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius-control);
  background: var(--ob-color-surface);
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: 2px;
  padding: 3px;
}

.ob-theme-switch button,
.ob-language-switch button,
.ob-theme-switch select,
.ob-language-switch select {
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--ob-color-muted);
  min-height: 30px;
  padding: 4px 9px;
  font: inherit;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0;
}

.ob-theme-switch button,
.ob-language-switch button {
  cursor: pointer;
}

.ob-theme-switch [aria-pressed="true"],
.ob-language-switch [aria-pressed="true"] {
  background: var(--ob-color-accent-soft);
  color: var(--ob-color-accent);
}

.ob-status {
  border-radius: var(--ob-radius-pill);
  background: var(--ob-color-surface-muted);
  color: var(--ob-color-muted);
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0;
}

.ob-status-success {
  background: var(--ob-status-success-bg);
  color: var(--ob-status-success-fg);
}

.ob-status-warning {
  background: var(--ob-status-warning-bg);
  color: var(--ob-status-warning-fg);
}

.ob-status-danger {
  background: var(--ob-status-danger-bg);
  color: var(--ob-status-danger-fg);
}

.ob-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--ob-color-surface);
}

.ob-table th,
.ob-table td {
  border-bottom: 1px solid var(--ob-color-border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.ob-table th {
  background: var(--ob-color-surface-muted);
  color: var(--ob-color-text);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.ob-code {
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius-control);
  background: var(--ob-color-surface-muted);
  color: var(--ob-color-text);
  font-family: var(--ob-font-mono);
  padding: 2px 6px;
}

@media (max-width: 760px) {
  .ob-shell {
    width: min(100% - 24px, 1180px);
    padding: var(--ob-space-xl) 0;
  }

  .ob-grid {
    grid-template-columns: 1fr;
  }

  .ob-stat-grid {
    grid-template-columns: 1fr;
  }
}