/*
 * UI Design Contract — Design Tokens (Task #54)
 *
 * IMPORTANT:
 * - This file defines ONLY visual tokens (colors/typography/spacing/radius/shadows).
 * - Domain math and formatting rules are NOT duplicated here.
 *   Sources of truth:
 *   - FORMAT_POLICY_V1: app/core/format_policy.py
 *   - METRICS_REGISTRY: app/core/metrics_registry.py
 */

:root {
  /* =========================
   * Surfaces / Backgrounds
   * ========================= */
  --color-bg-body: #f5f7fa;
  --color-bg-card: #ffffff;
  --color-bg-hover: #f7fafc;
  --color-bg-disabled: #f1f5f9;
  --color-bg-section: #f8fafc;
  --color-bg-hover-strong: #edf2f7;       /* legacy hover for table headers */

  /* =========================
   * Text
   * ========================= */
  --color-text-primary: #2c3e50;
  --color-text-secondary: #718096;
  --color-text-muted: #94a3b8;
  --color-text-disabled: #cbd5e0;
  --color-text-heading: #1a202c;          /* legacy headings */
  --color-text-heading-2: #1f2937;        /* legacy headings (chart titles) */
  --color-text-strong: #0f172a;           /* strong/dense text (legacy) */
  --color-text-gray-800: #2d3748;         /* legacy gray-800-ish */
  --color-text-slate: #334155;            /* slate-700-ish (legacy) */
  --color-text-muted-2: #64748b;          /* slate-500-ish (legacy) */
  --color-text-slate-600: #475569;        /* slate-600-ish (legacy) */

  /* =========================
   * Accents (surfaces/buttons)
   * ========================= */
  --color-primary: #4299e1;
  --color-primary-hover: #3182ce;
  --color-secondary: #e2e8f0;
  --color-secondary-hover: #cbd5e0;
  --color-on-primary: #ffffff;

  /* =========================
   * Links / Action text (text-level accents)
   * ========================= */
  --color-link: #2b6cb0;              /* WCAG AA on white */
  --color-link-hover: #2c5282;
  --color-link-visited: #553c9a;
  --color-link-subtle: #4a5568;       /* tables/panels */
  --color-action-text: #2b6cb0;       /* text buttons: reset/edit */

  /* =========================
   * Semantic colors
   * ========================= */
  --color-success: #48bb78;
  --color-warning: #f6ad55;
  --color-error: #f56565;
  --color-info: #4299e1;

  --color-success-bg: #f0fdf4;
  --color-success-border: #86efac;
  --color-success-text: #166534;
  --color-success-hover: #38a169;
  --color-success-bg-soft: #ecfdf5;       /* legacy pill background */
  --color-success-border-soft: #bbf7d0;   /* legacy pill border */

  --color-error-bg: #fef2f2;
  --color-error-border: #fca5a5;
  --color-error-text: #991b1b;
  --color-error-hover: #c53030;
  --color-error-border-soft: #fecaca;     /* legacy pill border */

  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;
  --color-warning-text: #92400e;
  --color-warning-hover: #d97706;
  --color-warning-border-strong: #fcd34d; /* legacy border (compare warnings) */

  --color-info-bg: #eff6ff;
  --color-info-border: #bfdbfe;
  --color-info-text: #1e40af;
  --color-info-hover: #3b82f6;

  /* Legacy "danger" accents (share revoke buttons) */
  --color-danger-bg: #fff1f2;
  --color-danger-border: #fecdd3;
  --color-danger-text: #be123c;

  /* Legacy "error message" block colors */
  --color-alert-error-bg: #fed7d7;
  --color-alert-error-text: #c53030;

  /* Strong delta colors (legacy) */
  --color-success-strong: #16a34a;
  --color-error-strong: #dc2626;

  /* Date-range selection accents (legacy indigo) */
  --color-accent-indigo-50: #eef2ff;
  --color-accent-indigo-100: #e0e7ff;
  --color-accent-indigo-500: #6366f1;
  --color-accent-blue-50: #ebf8ff;        /* legacy accent background (multiselect count) */

  /* =========================
   * Borders
   * ========================= */
  --color-border-light: #e2e8f0;
  --color-border-medium: #cbd5e0;
  --color-border-dark: #a0aec0;
  --color-border-subtle: #eef2f7;         /* very light separators (legacy) */

  /* =========================
   * Typography
   * ========================= */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  --font-size-h1: 32px;
  --font-size-h2: 20px;
  --font-size-h3: 18px;
  --font-size-base: 13px;
  --font-size-small: 12px;
  --font-size-tiny: 11px;
  --font-size-micro: 10px;
  --font-size-control-lg: 14px;          /* legacy controls / subtitles */
  --font-size-subtitle: 16px;            /* legacy subtitle */

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;
  --line-height-loose: 1.8;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* =========================
   * Spacing (4px base)
   * ========================= */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-8: 32px;

  /* =========================
   * Radius
   * ========================= */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 10px;                    /* legacy popovers/banners */
  --radius-full: 999px;

  /* =========================
   * Shadows
   * ========================= */
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-normal: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 4px 10px rgba(0, 0, 0, 0.10);
  --shadow-large: 0 8px 20px rgba(0, 0, 0, 0.12);
  --shadow-popover-strong: 0 10px 28px rgba(0, 0, 0, 0.14); /* legacy share popover */
  --shadow-dropdown: 0 4px 6px rgba(0, 0, 0, 0.10);         /* legacy dropdowns */

  /* =========================
   * Focus ring
   * ========================= */
  --focus-ring-color: rgba(66, 153, 225, 0.6);
  --focus-ring-width: 2px;
  --focus-ring-offset: 2px;
  --focus-shadow-sm: 0 0 0 2px rgba(66, 153, 225, 0.10);
  --focus-shadow-md: 0 0 0 2px rgba(66, 153, 225, 0.12);
  --focus-shadow-lg: 0 0 0 3px rgba(66, 153, 225, 0.10);

  /* =========================
   * Controls + Overlays (Next UI contract v1)
   * ========================= */
  /* Controls (fields/buttons) */
  --control-height: 30px;          /* Next canon (do not change without SPEC) */
  --control-radius: var(--radius-md);
  --control-padding-x: 10px;
  --control-gap-inline: 6px;
  /* Optical vertical centering for control text (see SPEC_ui_design_contract.md).
   * Applied via `.dbn-control-text { transform: translateY(var(--control-optical-y)); }`
   * Default is a small universal nudge; can be overridden per ui-size if needed.
   */
  --control-optical-y: -0.5px;
  --caret-size: 12px;
  --caret-optical-y: -0.5px;
  --icon-size-sm: 14px;
  --icon-size-md: 16px;
  --icon-size-lg: 18px;
  --icon-optical-y: -0.5px;
  --label-gap: 6px;               /* label → control gap */
  --filter-row-gap: 10px;         /* FilterBar row gap */
  --filter-col-gap: 12px;         /* FilterBar col gap */
  /* Filter controls sizing (Next rules, Feb 2026):
   * - object filter control: 250px (may shrink on narrow screens)
   * - other controls: content-based, but capped by max-width = 300px
   */
  --filter-control-max-width: 200px;
  --filter-object-control-width: 250px;
  --filter-object-overlay-width: 360px;
  --option-row-padding-y: 6px;
  --option-row-padding-x: 10px;
  --option-row-radius: var(--radius-sm);
  --option-row-gap: 4px;
  --option-row-font-size: var(--font-size-base);

  /* Overlays (dropdown / popover / panel) */
  --overlay-viewport-padding: 12px;
  --overlay-max-width: 720px;
  --overlay-max-height: 520px;
  --popover-padding: 10px;
  --popover-radius: var(--radius-lg);
  --popover-title-size: var(--font-size-base);
  --popover-title-gap: 8px;
  --popover-body-size: var(--font-size-base);
  --popover-body-line-height: var(--line-height-normal);
  --popover-body-gap: 8px;
  --popover-anchor-gap: 6px;
  /* Chrome padding budgets (SoT):
   * - select: paddings + caret, no checkbox
   * - panel: checkbox/icons + paddings + scrollbar
   */
  /* select menu chrome budget:
   * popover padding (6*2) + option padding (10*2) + border + scrollbar (when present)
   * must be large enough to avoid ellipsis when overlayW is computed by text width.
   */
  --overlay-chrome-padding-select: 56px;
  --overlay-chrome-padding-panel: 76px;
  --overlay-chrome-padding: var(--overlay-chrome-padding-panel); /* backward-compat alias */

  /* Overlay width steps (SoT) */
  --overlay-step-240: 240px;
  --overlay-step-280: 280px;
  --overlay-step-360: 360px;
  --overlay-step-480: 480px;
  --overlay-step-560: 560px;
  /* Unified kebab menu width (longest current item fit: "Сохранить XLSX"). */
  --overlay-menu-width: 160px;
  --calendar-nav-button-size: var(--control-height);
  --calendar-nav-icon-size: var(--icon-size-md);
  --calendar-nav-icon-optical-y: -0.5px;
  --calendar-weekday-font-size: 11px;
  --calendar-grid-gap: 2px;
  --calendar-day-radius: 10px;
  --table-toolbar-gap: 8px;
  --table-search-width: 280px;
  --table-scope-width: 180px;
  --table-wrap-max-height: 520px;
  --chart-min-height: 320px;
  --widget-menu-icon-size: 18px;
  --widget-menu-offset-y: 34px;

  /* =========================
   * Skeleton
   * ========================= */
  --skeleton-base: #f0f0f0;
  --skeleton-highlight: #e0e0e0;
}

/* UI Size Variant A (SoT, Next `/charts`):
 * - md = default (no attribute)
 * - xs/sm/lg enabled only via `:root[data-ui-size="..."]`
 * - the active scale is still applied ONLY server-side on <html>
 */
:root[data-ui-size='xs'] {
  --font-size-base: 11px;
  --font-size-small: 10px;
  --control-height: 26px;
  --control-padding-x: 6px;
  --control-gap-inline: 4px;
  --control-optical-y: -0.5px;
  --caret-size: 10px;
  --option-row-padding-y: 5px;
  --option-row-padding-x: 8px;
  --option-row-gap: 3px;
  --popover-padding: 8px;
  --filter-row-gap: 6px;
  --filter-col-gap: 8px;
  --calendar-nav-icon-size: 14px;
  --calendar-weekday-font-size: 10px;
  --widget-menu-icon-size: 16px;
}

:root[data-ui-size='sm'] {
  --font-size-base: 12px;
  --font-size-small: 11px;
  --control-height: 28px;
  --control-padding-x: 8px;
  --control-gap-inline: 5px;
  --control-optical-y: -0.5px;
  --caret-size: 11px;
  --option-row-padding-y: 5px;
  --option-row-padding-x: 9px;
  --popover-padding: 9px;
  --filter-row-gap: 8px;
  --filter-col-gap: 10px;
  --calendar-nav-icon-size: 15px;
  --calendar-weekday-font-size: 10px;
  --widget-menu-icon-size: 17px;
}

:root[data-ui-size='lg'] {
  --font-size-base: 14px;
  --font-size-small: 13px;
  --control-height: 32px;
  --control-padding-x: 12px;
  --control-gap-inline: 6px;
  --control-optical-y: -0.5px;
  --caret-size: 13px;
  --option-row-padding-y: 7px;
  --option-row-padding-x: 12px;
  --option-row-radius: var(--radius-md);
  --popover-padding: 12px;
  --filter-row-gap: 12px;
  --filter-col-gap: 14px;
  --calendar-nav-icon-size: 18px;
  --calendar-weekday-font-size: 12px;
  --widget-menu-icon-size: 20px;
}