/*
 * Survey design tokens
 * --------------------
 * Centralized, theme-aware tokens for the Survey app. These variables were
 * created to gradually replace hard-coded values across legacy stylesheets and
 * encourage consistent spacing, typography, and color usage.
 */
:root {
  /* Typography */
  --font-heading: "Playfair Display", "Times New Roman", serif;
  --font-body: "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-ui: "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Roboto", monospace;

  --font-size-2xs: 0.75rem;   /* 12px */
  --font-size-xs: 0.8125rem;  /* 13px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-md: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 2rem;      /* 32px */
  --font-size-3xl: 2.5rem;    /* 40px */

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

  --line-height-tight: 1.2;
  --line-height-base: 1.5;
  --line-height-relaxed: 1.8;

  /* Spacing scale (4px baseline, rem-based for zoom friendliness) */
  --space-3xs: 0.25rem;  /* 4px */
  --space-2xs: 0.5rem;   /* 8px */
  --space-xs: 0.75rem;   /* 12px */
  --space-sm: 1rem;      /* 16px */
  --space-md: 1.25rem;   /* 20px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 2.5rem;   /* 40px */
  --space-3xl: 3rem;     /* 48px */
  --space-4xl: 4rem;     /* 64px */

  /* Layout */
  --container-max-width: 75rem; /* 1200px */
  --content-max-width: 45rem;   /* 720px */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 999px;

  --border-width-none: 0;
  --border-width-hairline: 1px;
  --border-width-thin: 1.5px;
  --border-width-regular: 2px;
  --border-width-bold: 3px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.16);

  /* Elevation (shadow + hairline pairing) */
  --elevation-border-width: 1px;
  --elevation-1-shadow: var(--shadow-sm);
  --elevation-1-border: rgba(15, 23, 42, 0.08);
  --elevation-2-shadow: var(--shadow-md);
  --elevation-2-border: rgba(15, 23, 42, 0.06);
  --elevation-3-shadow: var(--shadow-lg);
  --elevation-3-border: rgba(15, 23, 42, 0.04);

  --transition-base: 180ms ease;
  --transition-slow: 320ms ease;

  /* Layering */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 400;
  --z-modal: 600;
  --z-popover: 700;
  --z-toast: 800;
  --z-tooltip: 900;

  /* Color palette */
  --color-primary-50: #f1f5ff;
  --color-primary-100: #dbe6ff;
  --color-primary-200: #b7ceff;
  --color-primary-300: #84adff;
  --color-primary-400: #4c88ff;
  --color-primary-500: #0B459C;
  --color-primary-600: #0B459C;
  --color-primary-700: #063899;
  --color-primary-800: #042768;
  --color-primary-900: #021a44;

  --color-secondary-50: #f3f5fa;
  --color-secondary-100: #e5e8f3;
  --color-secondary-200: #cdd2e6;
  --color-secondary-300: #a9b4d3;
  --color-secondary-400: #7481b1;
  --color-secondary-500: #4a5891;
  --color-secondary-600: #394477;
  --color-secondary-700: #2e375f;
  --color-secondary-800: #222946;
  --color-secondary-900: #171d35;

  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;

  /* Functional colors */
  --color-success-100: #dcfce7;
  --color-success-500: #16a34a;
  --color-success-700: #15803d;

  --color-warning-100: #fef3c7;
  --color-warning-700: #b45309;

  --color-danger-100: #fee2e2;
  --color-danger-500: #ef4444;
  --color-danger-700: #b91c1c;

  /* Semantic roles for quick use */
  --color-text-primary: #1c1c1c;
  --color-text-secondary: #494949;
  --color-text-muted: #757575;
  --color-text-inverse: #ffffff;

  --color-surface: #ffffff;
  --bg-surface: #ffffff;
  --color-surface-subtle: #f5f7fb;
  --color-background: #F5F5F5;
  --color-border: #D9D9D9;
  --color-divider: #D9D9D9;

  --color-link: var(--color-primary-500);
  --color-link-hover: var(--color-primary-400);
  --color-focus-ring: rgba(11, 91, 255, 0.35);
}

/* Dark theme overrides */
.dark-theme {
  /* Brand palette tuned for dark backgrounds */
  --color-primary-50: #e5edff;
  --color-primary-100: #c7d9ff;
  --color-primary-200: #FFFFFF;
  --color-primary-300: #8ab0ff;
  --color-primary-400: #6b9bfd;
  --color-primary-500: #0B459C;
  --color-primary-600: #356ed9;
  --color-primary-700: #2557b3;
  --color-primary-800: #1a3f86;
  --color-primary-900: #112956;

  --color-secondary-50: #edf0ff;
  --color-secondary-100: #d8ddff;
  --color-secondary-200: #c0c7f6;
  --color-secondary-300: #a3acd9;
  --color-secondary-400: #8891bd;
  --color-secondary-500: #6c76a2;
  --color-secondary-600: #535b83;
  --color-secondary-700: #3d4566;
  --color-secondary-800: #29304a;
  --color-secondary-900: #1b2032;

  --color-neutral-50: #f6f7fb;
  --color-neutral-100: #e4e8f2;
  --color-neutral-200: #ccd4e2;
  --color-neutral-300: #b2bed0;
  --color-neutral-400: #97a5ba;
  --color-neutral-500: #7c8ca0;
  --color-neutral-600: #627287;
  --color-neutral-700: #4a596d;
  --color-neutral-800: #334054;
  --color-neutral-900: #1f2836;

  --color-success-100: #c8f7dc;
  --color-success-500: #34d399;
  --color-success-700: #059669;

  --color-warning-100: #fde9c3;
  --color-warning-500: #fbbf24;
  --color-warning-700: #d97706;

  --color-danger-100: #fbc8c8;
  --color-danger-500: #f87171;
  --color-danger-700: #dc2626;

  --elevation-border-width: 1px;
  --elevation-1-border: rgba(148, 163, 184, 0.3);
  --elevation-2-border: rgba(148, 163, 184, 0.2);
  --elevation-3-border: rgba(148, 163, 184, 0.12);

  --color-text-primary: #E0E0E0;
  --color-text-secondary: #B3B3B3;
  --color-text-muted: #757575;

  --color-surface: #434343;
  --bg-surface: #434343;
  --color-surface-subtle: #434343;
  --color-background: #323232;
  --color-border: #757575;
  --color-divider: #757575;

  --color-link: var(--color-primary-400);
  --color-link-hover: var(--color-primary-300);
  --color-focus-ring: rgba(148, 163, 184, 0.45);
}


/* Legacy bridge: map existing theme tokens to the new system to avoid regressions
   while we migrate individual stylesheets. */
:root {
  --bg-surface:#ffffff;
  --bg-card: var(--color-surface);
  --card-highlight: var(--color-primary-50);
  --text-primary: var(--color-text-primary);
  --text-secondary: var(--color-text-secondary);
  --text-body: var(--color-text-primary);
  --text-tertiary: var(--color-text-muted);
  --icon-primary: var(--color-text-primary);
  --icon-secondary: var(--color-text-secondary);
  --border-line: var(--color-border);
  --btn-primary-bg: var(--color-primary-500);
  --btn-secondary-bg: var(--color-primary-400);
  --btn-stroke: var(--color-primary-600);
  --state-success: var(--color-success-500);
  --state-warning: var(--color-warning-500);
  --state-error: var(--color-danger-500);
  --footer-copy: var(--color-text-secondary);
  --side-nav-bg: var(--color-surface);
}

.dark-theme {
  --bg-surface: #434343;
  --bg-card: #323232;
  --card-highlight: rgba(76, 136, 255, 0.2);
  --text-primary: var(--color-text-primary);
  --text-secondary: var(--color-text-secondary);
  --text-body: var(--color-text-primary);
  --text-tertiary: var(--color-text-muted);
  --icon-primary: #f8fafc;
  --icon-secondary: #cbd5f5;
  --border-line: var(--color-border);
  --btn-stroke: var(--color-primary-200);
  --footer-copy: var(--color-text-primary);
  --side-nav-bg: #0f172a;
}