:root {
  color-scheme: light;

  /* Formal color tokens. Product components must reference these tokens instead of raw colors. */
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-surface-muted: #f5f7fa;
  --color-surface-subtle: #eef2f7;

  --color-border: #e5e8ef;
  --color-border-strong: #b9ddff;

  --color-text: #1f2329;
  --color-text-muted: #646a73;
  --color-text-subtle: #8a9099;
  --color-text-inverse: #ffffff;

  --color-primary: #2f8cff;
  --color-primary-hover: #1677e8;
  --color-primary-soft: #eaf4ff;

  --color-success: #22a06b;
  --color-success-soft: #e9f7ef;
  --color-success-border: #b8e6cb;
  --color-warning: #d97706;
  --color-warning-soft: #fff4df;
  --color-warning-border: #ffd89a;
  --color-danger: #d92d20;
  --color-danger-soft: #fff0ed;
  --color-danger-border: #ffc4bc;
  --color-info: #2f8cff;
  --color-info-soft: #eaf4ff;
  --color-info-border: #badfff;
  --color-neutral: #646a73;
  --color-neutral-soft: #f1f3f6;
  --color-neutral-border: #dde2ea;

  /* System-specific tokens may be added only as semantic solid/soft pairs. */

  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", "Noto Sans CJK TC", Arial, sans-serif;

  --font-size-caption: 12px;
  --font-size-label: 13px;
  --font-size-body: 14px;
  --font-size-section: 16px;
  --font-size-title: 24px;

  --line-height-caption: 16px;
  --line-height-label: 18px;
  --line-height-body: 22px;
  --line-height-section: 24px;
  --line-height-title: 32px;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 650;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;

  --radius-control: 6px;
  --radius-card: 8px;
  --radius-detail-panel: 16px;

  --shadow-subtle: 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-detail: 0 24px 64px color-mix(in srgb, var(--color-text) 22%, transparent);

  --control-height-small: 32px;
  --control-height-default: 38px;
  --control-height-large: 44px;

  --icon-size-support: 14px;
  --icon-size-compact: 16px;
  --icon-size-default: 18px;
  --icon-size-emphasis: 20px;
  --icon-size-display: 24px;

  --shell-sidebar-width: 208px;
  --shell-sidebar-collapsed-width: 80px;
  --shell-topbar-height: 56px;
  --shell-inspector-width: 340px;
  --shell-navigation-drawer-width: 320px;
  --command-palette-width: 520px;
  --workbench-rail-width: 220px;
  --workbench-inspector-width: 320px;

  --detail-compact-max-width: 620px;
  --detail-default-max-width: 960px;
  --detail-wide-max-width: 1120px;
  --detail-expanded-max-width: 1640px;
  --detail-expanded-max-height: 860px;
  --detail-expanded-gutter-x: 24px;
  --detail-expanded-gutter-y: 16px;
  --detail-activity-rail-width: 280px;

  --motion-fast: 120ms;
  --motion-normal: 180ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
}

html {
  font-family: var(--font-sans);
  letter-spacing: 0;
  background: var(--color-bg);
  color: var(--color-text);
}

* {
  box-sizing: border-box;
}

.status-tag {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-control);
  font-size: var(--font-size-caption);
  line-height: var(--line-height-caption);
  font-weight: var(--font-weight-medium);
  border: 1px solid transparent;
}

.status-tag[data-tone="info"] {
  color: var(--color-info);
  border-color: var(--color-info-border);
  background: var(--color-info-soft);
}

.status-tag[data-tone="success"] {
  color: var(--color-success);
  border-color: var(--color-success-border);
  background: var(--color-success-soft);
}

.status-tag[data-tone="warning"] {
  color: var(--color-warning);
  border-color: var(--color-warning-border);
  background: var(--color-warning-soft);
}

.status-tag[data-tone="danger"] {
  color: var(--color-danger);
  border-color: var(--color-danger-border);
  background: var(--color-danger-soft);
}

.status-tag[data-tone="neutral"] {
  color: var(--color-text-muted);
  border-color: var(--color-neutral-border);
  background: var(--color-neutral-soft);
}

.standard-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}

.standard-card[data-selected="true"] {
  border-color: var(--color-border-strong);
  box-shadow: 0 0 0 1px var(--color-border-strong);
}

.focus-ring:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}