/**
 * DCM Design Tokens & Global Style Standard
 * 
 * Provides unified semantic tokens for colors, typography, spacing, shadows,
 * radius, z-index layers, and dark-mode adaptations across frontend and admin.
 *
 * Conforms to WCAG AA contrast standards and the 60-30-10 color balance rule.
 */

:root {
    /* ==========================================================================
       1. BRAND & ACCENT PALETTE
       ========================================================================== */
    --dcm-brand-primary: #3b82f6;
    --dcm-brand-primary-hover: #2563eb;
    --dcm-brand-primary-active: #1d4ed8;
    --dcm-brand-primary-subtle: #eff6ff;
    --dcm-brand-primary-border: #bfdbfe;
    
    --dcm-brand-secondary: #113d5a;
    --dcm-brand-secondary-hover: #0d2e44;
    --dcm-brand-secondary-subtle: #f0f6fa;
    
    --dcm-brand-accent: #f59113;
    --dcm-brand-accent-hover: #d47810;
    --dcm-brand-accent-active: #b96609;
    --dcm-brand-accent-subtle: #fffbeb;

    /* ==========================================================================
       2. NEUTRALS & GRAY SCALE (Tailwind/Radix compatible)
       ========================================================================== */
    --dcm-gray-50:  #f8fafc;
    --dcm-gray-100: #f1f5f9;
    --dcm-gray-200: #e2e8f0;
    --dcm-gray-300: #cbd5e1;
    --dcm-gray-400: #94a3b8;
    --dcm-gray-500: #64748b;
    --dcm-gray-600: #475569;
    --dcm-gray-700: #334155;
    --dcm-gray-800: #1e293b;
    --dcm-gray-900: #0f172a;
    --dcm-gray-950: #020617;

    /* ==========================================================================
       3. SEMANTIC SURFACES & BACKGROUNDS
       ========================================================================== */
    --dcm-surface-0: #f8fafc;         /* Page Canvas / App background */
    --dcm-surface-1: #ffffff;         /* Main Cards, Tables, Shells */
    --dcm-surface-2: #f1f5f9;         /* Sub-sections, Well areas, Table Headers */
    --dcm-surface-3: #e2e8f0;         /* Hover states, Active items */
    --dcm-surface-card: #ffffff;      /* Standard card background */
    --dcm-surface-elevated: #ffffff;  /* Modals, Popovers, Dropdowns */
    --dcm-surface-overlay: rgba(15, 23, 42, 0.65); /* Modal Backdrops */

    /* ==========================================================================
       4. TYPOGRAPHY & TEXT COLORS
       ========================================================================== */
    --dcm-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --dcm-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --dcm-font-heading: var(--dcm-font-sans);

    --dcm-text-primary: #0f172a;      /* Primary headings and main text */
    --dcm-text-secondary: #334155;    /* Body text, labels */
    --dcm-text-muted: #64748b;        /* Helper text, secondary timestamps */
    --dcm-text-subtle: #94a3b8;       /* Placeholders, disabled text */
    --dcm-text-inverse: #ffffff;      /* Text on dark/primary backgrounds */

    --dcm-text-xs: 0.75rem;           /* 12px */
    --dcm-text-sm: 0.875rem;          /* 14px */
    --dcm-text-base: 1rem;            /* 16px */
    --dcm-text-lg: 1.125rem;          /* 18px */
    --dcm-text-xl: 1.25rem;           /* 20px */
    --dcm-text-2xl: 1.5rem;           /* 24px */
    --dcm-text-3xl: 1.875rem;         /* 30px */
    --dcm-text-4xl: 2.25rem;          /* 36px */

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

    --dcm-leading-tight: 1.25;
    --dcm-leading-normal: 1.5;
    --dcm-leading-relaxed: 1.625;

    /* ==========================================================================
       5. BORDERS & DIVIDERS
       ========================================================================== */
    --dcm-border-subtle: #f1f5f9;
    --dcm-border-default: #e2e8f0;
    --dcm-border-strong: #cbd5e1;
    --dcm-border-focus: #3b82f6;
    --dcm-ring-focus: rgba(59, 130, 246, 0.35);

    /* ==========================================================================
       6. STATUS & FEEDBACK COLORS
       ========================================================================== */
    /* Success */
    --dcm-success: #10b981;
    --dcm-success-hover: #059669;
    --dcm-success-light: #ecfdf5;
    --dcm-success-border: #a7f3d0;
    --dcm-success-text: #065f46;

    /* Warning */
    --dcm-warning: #f59e0b;
    --dcm-warning-hover: #d97706;
    --dcm-warning-light: #fffbeb;
    --dcm-warning-border: #fde68a;
    --dcm-warning-text: #92400e;

    /* Danger / Error */
    --dcm-danger: #ef4444;
    --dcm-danger-hover: #dc2626;
    --dcm-danger-light: #fef2f2;
    --dcm-danger-border: #fecaca;
    --dcm-danger-text: #991b1b;

    /* Info */
    --dcm-info: #3b82f6;
    --dcm-info-hover: #2563eb;
    --dcm-info-light: #eff6ff;
    --dcm-info-border: #bfdbfe;
    --dcm-info-text: #1e40af;

    /* ==========================================================================
       7. SPACING SCALE
       ========================================================================== */
    --dcm-space-0: 0;
    --dcm-space-1: 0.25rem;   /* 4px */
    --dcm-space-2: 0.5rem;    /* 8px */
    --dcm-space-3: 0.75rem;   /* 12px */
    --dcm-space-4: 1rem;      /* 16px */
    --dcm-space-5: 1.25rem;   /* 20px */
    --dcm-space-6: 1.5rem;    /* 24px */
    --dcm-space-8: 2rem;      /* 32px */
    --dcm-space-10: 2.5rem;   /* 40px */
    --dcm-space-12: 3rem;     /* 48px */
    --dcm-space-16: 4rem;     /* 64px */
    --dcm-space-20: 5rem;     /* 80px */
    --dcm-space-24: 6rem;     /* 96px */

    /* ==========================================================================
       8. BORDER RADIUS
       ========================================================================== */
    --dcm-radius-none: 0px;
    --dcm-radius-sm: 0.25rem; /* 4px */
    --dcm-radius-md: 0.375rem;/* 6px */
    --dcm-radius-lg: 0.5rem;  /* 8px */
    --dcm-radius-xl: 0.75rem; /* 12px */
    --dcm-radius-2xl: 1rem;   /* 16px */
    --dcm-radius-3xl: 1.5rem; /* 24px */
    --dcm-radius-full: 9999px;

    /* ==========================================================================
       9. SHADOWS & ELEVATION
       ========================================================================== */
    --dcm-shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --dcm-shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -2px rgba(15, 23, 42, 0.1);
    --dcm-shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.1);
    --dcm-shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);
    --dcm-shadow-2xl: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
    --dcm-shadow-inner: inset 0 2px 4px 0 rgba(15, 23, 42, 0.06);
    --dcm-shadow-focus: 0 0 0 3px var(--dcm-ring-focus);

    /* ==========================================================================
       10. Z-INDEX LAYERING (Overlay stack contract)
       ========================================================================== */
    --dcm-z-base: 0;
    --dcm-z-dropdown: 1000;
    --dcm-z-sticky: 1020;
    --dcm-z-fixed: 1030;
    --dcm-z-drawer-backdrop: 1035;
    --dcm-z-drawer: 1040;
    --dcm-z-backdrop: 1045;
    --dcm-z-modal: 1050;
    --dcm-z-popover: 1060;
    --dcm-z-tooltip: 1070;
    --dcm-z-toast: 1080;
    --dcm-z-banner: 10900;
    --dcm-z-dialog-root: 11000;
    --dcm-z-toast-root: 11300;

    /* ==========================================================================
       11. TRANSITIONS & TIMING
       ========================================================================== */
    --dcm-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --dcm-transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --dcm-transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

    /* ==========================================================================
       12. RESPONSIVE BREAKPOINTS (reference only)
       ========================================================================== */
    --dcm-bp-sm: 640px;
    --dcm-bp-md: 768px;
    --dcm-bp-lg: 1024px;
    --dcm-bp-xl: 1280px;
    --dcm-bp-2xl: 1536px;
}

/* ==========================================================================
   DARK THEME OVERRIDES
   ========================================================================== */
[data-theme="dark"],
body.admin-shell.admin-theme-dark,
.dark {
    color-scheme: dark;

    /* Surfaces */
    --dcm-surface-0: #0b1120;
    --dcm-surface-1: #111827;
    --dcm-surface-2: #0f172a;
    --dcm-surface-3: #1f2937;
    --dcm-surface-card: #111827;
    --dcm-surface-elevated: #1e293b;
    --dcm-surface-overlay: rgba(2, 6, 23, 0.82);

    /* Neutrals */
    --dcm-gray-50:  #0f172a;
    --dcm-gray-100: #1e293b;
    --dcm-gray-200: #334155;
    --dcm-gray-300: #475569;
    --dcm-gray-400: #64748b;
    --dcm-gray-500: #94a3b8;
    --dcm-gray-600: #cbd5e1;
    --dcm-gray-700: #e2e8f0;
    --dcm-gray-800: #f1f5f9;
    --dcm-gray-900: #f8fafc;
    --dcm-gray-950: #ffffff;

    /* Text */
    --dcm-text-primary: #f8fafc;
    --dcm-text-secondary: #cbd5e1;
    --dcm-text-muted: #94a3b8;
    --dcm-text-subtle: #64748b;
    --dcm-text-inverse: #0f172a;

    /* Borders */
    --dcm-border-subtle: #1e293b;
    --dcm-border-default: #334155;
    --dcm-border-strong: #475569;
    --dcm-border-focus: #60a5fa;
    --dcm-ring-focus: rgba(96, 165, 250, 0.4);

    /* Status adaptations */
    --dcm-success-light: rgba(16, 185, 129, 0.15);
    --dcm-success-border: rgba(16, 185, 129, 0.35);
    --dcm-success-text: #6ee7b7;

    --dcm-warning-light: rgba(245, 158, 11, 0.15);
    --dcm-warning-border: rgba(245, 158, 11, 0.35);
    --dcm-warning-text: #fcd34d;

    --dcm-danger-light: rgba(239, 68, 68, 0.15);
    --dcm-danger-border: rgba(239, 68, 68, 0.35);
    --dcm-danger-text: #fca5a5;

    --dcm-info-light: rgba(59, 130, 246, 0.15);
    --dcm-info-border: rgba(59, 130, 246, 0.35);
    --dcm-info-text: #93c5fd;

    /* Shadows */
    --dcm-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.35);
    --dcm-shadow-md: 0 4px 8px -1px rgba(0, 0, 0, 0.45);
    --dcm-shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.55);
    --dcm-shadow-xl: 0 20px 30px -5px rgba(0, 0, 0, 0.65);
}

/* ==========================================================================
   COMPATIBILITY BRIDGING (seamless interoperability with existing CMS CSS)
   ========================================================================== */
:root {
    --dcm-primary: var(--dcm-brand-primary);
    --dcm-primary-hover: var(--dcm-brand-primary-hover);
    --dcm-primary-active: var(--dcm-brand-primary-active);
    --dcm-secondary: var(--dcm-brand-secondary);
    --dcm-accent: var(--dcm-brand-accent);

    --brand-primary: var(--dcm-brand-primary);
    --brand-primary-dark: var(--dcm-brand-primary-hover);
    --brand-primary-darker: var(--dcm-brand-primary-active);
    --brand-secondary: var(--dcm-brand-secondary);
    --brand-orange: var(--dcm-brand-accent);
    --color-success: var(--dcm-success);
    --color-warning: var(--dcm-warning);
    --color-danger: var(--dcm-danger);
    --color-info: var(--dcm-info);
}

/* ==========================================================================
   GLOBAL UTILITY CLASSES
   ========================================================================== */
.dcm-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.dcm-text-primary   { color: var(--dcm-text-primary); }
.dcm-text-secondary { color: var(--dcm-text-secondary); }
.dcm-text-muted     { color: var(--dcm-text-muted); }
.dcm-text-success   { color: var(--dcm-success); }
.dcm-text-warning   { color: var(--dcm-warning); }
.dcm-text-danger    { color: var(--dcm-danger); }
.dcm-text-info      { color: var(--dcm-info); }

.dcm-bg-surface   { background-color: var(--dcm-surface-0); }
.dcm-bg-card      { background-color: var(--dcm-surface-card); }
.dcm-bg-elevated  { background-color: var(--dcm-surface-elevated); }

.dcm-border         { border: 1px solid var(--dcm-border-default); }
.dcm-border-subtle  { border: 1px solid var(--dcm-border-subtle); }
.dcm-border-strong  { border: 1px solid var(--dcm-border-strong); }

.dcm-rounded-sm   { border-radius: var(--dcm-radius-sm); }
.dcm-rounded-md   { border-radius: var(--dcm-radius-md); }
.dcm-rounded-lg   { border-radius: var(--dcm-radius-lg); }
.dcm-rounded-xl   { border-radius: var(--dcm-radius-xl); }
.dcm-rounded-full { border-radius: var(--dcm-radius-full); }

.dcm-shadow-sm    { box-shadow: var(--dcm-shadow-sm); }
.dcm-shadow-md    { box-shadow: var(--dcm-shadow-md); }
.dcm-shadow-lg    { box-shadow: var(--dcm-shadow-lg); }
.dcm-shadow-xl    { box-shadow: var(--dcm-shadow-xl); }

/* Shimmer animation for skeletons */
@keyframes dcm-shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.dcm-skeleton-shimmer {
    background: linear-gradient(90deg, var(--dcm-surface-2) 25%, var(--dcm-surface-3) 50%, var(--dcm-surface-2) 75%);
    background-size: 200% 100%;
    animation: dcm-shimmer 1.75s infinite;
}