/**
 * KonRail-Intern design tokens
 * @see docs/ui-redesign/design-system.md
 */
:root {
  /* Brand */
  --color-brand: #c0392b;
  --color-brand-hover: #9e2016;
  --color-brand-muted: #fdecea;
  --color-brand-on: #ffffff;

  /* Sidebar */
  --color-sidebar-bg: #0f172a;
  --color-sidebar-text: #94a3b8;
  --color-sidebar-text-active: #ffffff;
  --color-sidebar-active-bg: #1e293b;
  --color-sidebar-rail: var(--color-brand);
  --sidebar-width: 300px;
  --sidebar-nav-font-size: 1.5rem;
  --sidebar-subnav-font-size: 1.2rem;
  --sidebar-subnav-nested-font-size: 1.1rem;
  --sidebar-nav-icon-size: 1.375rem;
  --sidebar-nav-item-min-height: 3.25rem;
  --sidebar-subnav-item-min-height: 2.875rem;
  --sidebar-subnav-indent: calc(var(--space-3) + var(--sidebar-nav-icon-size) + var(--space-3));

  /* Surfaces */
  --color-surface-page: #f1f5f9;
  --color-surface-page-alt: #f0f4f8;
  --color-surface-card: #ffffff;
  --color-surface-zebra: #f8fafc;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  /* Text */
  --color-text-primary: #0f172a;
  --color-text-secondary: #64748b;
  --color-link: #1d4ed8;
  --color-focus: #2563eb;

  /* Semantic */
  --color-success: #166534;
  --color-success-bg: #dcfce7;
  --color-warning: #92400e;
  --color-warning-bg: #fef3c7;
  --color-danger: #b91c1c;
  --color-danger-bg: #fee2e2;
  --color-info: #1d4ed8;
  --color-info-bg: #dbeafe;
  --color-neutral: #334155;
  --color-neutral-bg: #f1f5f9;
  --color-muted: #64748b;
  --color-muted-bg: #f8fafc;

  /* Typography (+12.5% app-wide; calendar grid excluded via orders.css) */
  --font-family-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-family-mono: 'JetBrains Mono', ui-monospace, monospace;
  /* Schedule / timetable figures — slab serif for stronger presence */
  --font-family-schedule: 'Bitter', 'Georgia', 'Times New Roman', serif;
  --font-size-xs: 0.844rem;
  --font-size-sm: 1.055rem;
  --font-size-base: 1.125rem;
  --font-size-md: 1.266rem;
  --font-size-lg: 1.406rem;
  --font-size-xl: 1.688rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.25;
  --line-height-compact: 1.29;
  --line-height-base: 1.4;

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-10: 2.5rem;

  /* Layout */
  --layout-page-margin: var(--space-6);
  --layout-section-gap: var(--space-2);
  --layout-header-gap: var(--space-4);
  --topbar-height: 3.75rem;
  --table-row-height: 2.75rem;
  --z-sidebar: 1000;
  --z-topbar: 900;
  --z-overlay: 1100;
  --z-modal: 1200;

  /* Radii */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-none: none;
  --shadow-overlay: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-modal: 0 8px 24px rgba(15, 23, 42, 0.12);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms var(--ease-out);

  /* Form controls (foundation — aligns with design-system.md) */
  --form-control-height: 2.75rem;
  --form-control-padding-y: 0.375rem;
  --form-control-padding-x: 0.75rem;
  --form-control-font-size: var(--font-size-base);
  --form-control-line-height: var(--line-height-base);
  --form-control-border-color: var(--color-border);
  --form-control-border-radius: var(--radius-sm);
  --form-control-color: var(--color-text-primary);
  --form-control-bg: var(--color-surface-card);
  --form-control-focus-border-color: var(--color-text-primary);
  --form-control-focus-shadow: 0 0 0 2px rgba(37, 99, 235, 0.25);
  --form-control-textarea-min-height: 5rem;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
  }
}