/**
 * ManaVault Design System v1.0.0
 * (c) 2024-2026 BTCin Corporate s.r.o.
 *
 * Complete CSS Design System — pure CSS, no preprocessor, no build tools.
 * Drop-in alongside existing stylesheets. Maintains backward compatibility.
 *
 * TABLE OF CONTENTS:
 * 1.  Design Tokens (CSS Variables)
 * 2.  Reset & Base
 * 3.  Typography
 * 4.  Layout System (Grid, Flex, Container)
 * 5.  Buttons
 * 6.  Forms
 * 7.  Cards
 * 8.  Tables
 * 9.  Modals
 * 10. Badges & Tags
 * 11. Stat Cards
 * 12. Navigation
 * 13. Alerts & Toasts
 * 14. Tooltips
 * 15. Loading States
 * 16. Spacing Utilities
 * 17. Display & Visibility Utilities
 * 18. Dark Mode (default) / Light Mode Toggle
 * 19. Animations
 * 20. Print Styles
 * 21. Responsive Breakpoints
 */


/* ============================================================================
   1. DESIGN TOKENS (CSS Variables)
   ============================================================================ */

:root {
    /* ---- Color Palette ---- */

    /* Primary brand */
    --ds-primary-50:  #E8F8FB;
    --ds-primary-100: #B8ECF4;
    --ds-primary-200: #88DFED;
    --ds-primary-300: #58D3E6;
    --ds-primary-400: #28C6DF;
    --ds-primary-500: #0891B2; /* Main accent */
    --ds-primary-600: #067A96;
    --ds-primary-700: #05637A;
    --ds-primary-800: #034C5E;
    --ds-primary-900: #023542;

    /* Neutral scale (slate) */
    --ds-neutral-0:   #FFFFFF;
    --ds-neutral-50:  #F8FAFC;
    --ds-neutral-100: #F1F5F9;
    --ds-neutral-200: #E2E8F0;
    --ds-neutral-300: #CBD5E1;
    --ds-neutral-400: #94A3B8;
    --ds-neutral-500: #64748B;
    --ds-neutral-600: #475569;
    --ds-neutral-700: #334155;
    --ds-neutral-800: #1E293B;
    --ds-neutral-900: #0F172A;
    --ds-neutral-950: #0A0E1A;

    /* Semantic colors */
    --ds-success-50:  #ECFDF5;
    --ds-success-100: #D1FAE5;
    --ds-success-200: #A7F3D0;
    --ds-success-300: #6EE7B7;
    --ds-success-400: #34D399;
    --ds-success-500: #10B981;
    --ds-success-600: #059669;
    --ds-success-700: #047857;

    --ds-warning-50:  #FFFBEB;
    --ds-warning-100: #FEF3C7;
    --ds-warning-200: #FDE68A;
    --ds-warning-300: #FCD34D;
    --ds-warning-400: #FBBF24;
    --ds-warning-500: #F59E0B;
    --ds-warning-600: #D97706;
    --ds-warning-700: #B45309;

    --ds-danger-50:   #FEF2F2;
    --ds-danger-100:  #FEE2E2;
    --ds-danger-200:  #FECACA;
    --ds-danger-300:  #FCA5A5;
    --ds-danger-400:  #F87171;
    --ds-danger-500:  #EF4444;
    --ds-danger-600:  #DC2626;
    --ds-danger-700:  #B91C1C;

    --ds-info-50:     #EFF6FF;
    --ds-info-100:    #DBEAFE;
    --ds-info-200:    #BFDBFE;
    --ds-info-300:    #93C5FD;
    --ds-info-400:    #60A5FA;
    --ds-info-500:    #3B82F6;
    --ds-info-600:    #2563EB;
    --ds-info-700:    #1D4ED8;

    /* Purple (for special actions like bag btn) */
    --ds-purple-500:  #8B5CF6;
    --ds-purple-600:  #7C3AED;

    /* ---- Semantic Mappings (Dark Theme - Default) ---- */
    --color-bg:             var(--ds-neutral-950);
    --color-surface:        var(--ds-neutral-900);
    --color-surface-raised: #1A1F2E;
    --color-surface-overlay: var(--ds-neutral-800);
    --color-border:         var(--ds-neutral-700);
    --color-border-subtle:  rgba(255, 255, 255, 0.06);

    --color-text:           var(--ds-neutral-50);
    --color-text-secondary: var(--ds-neutral-400);
    --color-text-muted:     var(--ds-neutral-500);
    --color-text-inverse:   var(--ds-neutral-900);

    --color-accent:         var(--ds-primary-500);
    --color-accent-hover:   var(--ds-primary-400);
    --color-accent-subtle:  rgba(8, 145, 178, 0.15);

    --color-success:        var(--ds-success-500);
    --color-success-subtle: rgba(16, 185, 129, 0.15);
    --color-warning:        var(--ds-warning-500);
    --color-warning-subtle: rgba(245, 158, 11, 0.15);
    --color-danger:         var(--ds-danger-500);
    --color-danger-subtle:  rgba(239, 68, 68, 0.15);
    --color-info:           var(--ds-info-500);
    --color-info-subtle:    rgba(59, 130, 246, 0.15);

    /* Backward compatibility aliases (map old vars to new) */
    --primary:        var(--ds-neutral-900);
    --secondary:      var(--ds-neutral-800);
    --accent:         var(--ds-primary-500);
    --success:        var(--ds-success-500);
    --warning:        var(--ds-warning-500);
    --danger:         var(--ds-danger-500);
    --info:           var(--ds-info-500);
    --text:           var(--ds-neutral-50);
    --text-muted:     var(--ds-neutral-400);
    --border:         var(--ds-neutral-700);
    --bg:             var(--ds-neutral-950);
    --card:           #1A1F2E;
    --sidebar:        #2D3748;
    --sidebar-active: var(--ds-neutral-800);

    /* ---- Typography ---- */
    --font-sans:  'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono:  'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    /* Type scale (1.25 ratio - Major Third) */
    --text-xs:    0.75rem;    /* 12px */
    --text-sm:    0.875rem;   /* 14px */
    --text-base:  1rem;       /* 16px */
    --text-md:    1.125rem;   /* 18px */
    --text-lg:    1.25rem;    /* 20px */
    --text-xl:    1.5rem;     /* 24px */
    --text-2xl:   1.75rem;    /* 28px */
    --text-3xl:   2rem;       /* 32px */
    --text-4xl:   2.5rem;     /* 40px */

    /* Font weights */
    --font-normal:    400;
    --font-medium:    500;
    --font-semibold:  600;
    --font-bold:      700;

    /* Line heights */
    --leading-tight:   1.25;
    --leading-normal:  1.5;
    --leading-relaxed: 1.625;
    --leading-loose:   1.75;

    /* Letter spacing */
    --tracking-tight:  -0.02em;
    --tracking-normal: 0;
    --tracking-wide:   0.05em;
    --tracking-wider:  0.1em;

    /* ---- Spacing Scale (4px base) ---- */
    --space-0:   0;
    --space-1:   0.25rem;  /*  4px */
    --space-2:   0.5rem;   /*  8px */
    --space-3:   0.75rem;  /* 12px */
    --space-4:   1rem;     /* 16px */
    --space-5:   1.25rem;  /* 20px */
    --space-6:   1.5rem;   /* 24px */
    --space-8:   2rem;     /* 32px */
    --space-10:  2.5rem;   /* 40px */
    --space-12:  3rem;     /* 48px */
    --space-16:  4rem;     /* 64px */
    --space-20:  5rem;     /* 80px */

    /* ---- Border Radius ---- */
    --radius-none: 0;
    --radius-sm:   4px;
    --radius-md:   6px;
    --radius-lg:   8px;
    --radius-xl:   12px;
    --radius-2xl:  16px;
    --radius-full: 9999px;

    /* ---- Shadows ---- */
    --shadow-xs:   0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm:   0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md:   0 4px 8px rgba(0, 0, 0, 0.25);
    --shadow-lg:   0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-xl:   0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-2xl:  0 12px 48px rgba(0, 0, 0, 0.4);
    --shadow-accent: 0 4px 16px rgba(8, 145, 178, 0.3);
    --shadow-success: 0 4px 16px rgba(16, 185, 129, 0.3);
    --shadow-danger: 0 4px 16px rgba(239, 68, 68, 0.3);

    /* ---- Transitions ---- */
    --transition-fast:    0.15s ease;
    --transition-base:    0.2s ease;
    --transition-slow:    0.3s ease;
    --transition-spring:  0.3s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* ---- Z-Index Scale ---- */
    --z-base:      0;
    --z-dropdown:  100;
    --z-sticky:    200;
    --z-overlay:   500;
    --z-modal:     1000;
    --z-toast:     1100;
    --z-tooltip:   1200;

    /* ---- Layout ---- */
    --sidebar-width:     260px;
    --sidebar-width-sm:  200px;
    --header-height:     56px;
    --container-max:     1400px;
    --container-content: 1200px;
}


/* ============================================================================
   2. RESET & BASE (augments existing reset)
   ============================================================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    -moz-tab-size: 4;
    tab-size: 4;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-hover);
}

img, svg, video {
    display: block;
    max-width: 100%;
}

/* Focus-visible for keyboard accessibility */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Selection */
::selection {
    background: var(--color-accent);
    color: white;
}

/* Native select dropdown options — must have explicit bg/color for dark theme */
select,
select option {
    background-color: var(--color-surface, #0F1219);
    color: var(--color-text, #F8FAFC);
}


/* ============================================================================
   3. TYPOGRAPHY
   ============================================================================ */

.ds-heading-1 {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
}

.ds-heading-2 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
}

.ds-heading-3 {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
}

.ds-heading-4 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
}

.ds-heading-5 {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    line-height: var(--leading-normal);
}

.ds-body {
    font-size: var(--text-base);
    line-height: var(--leading-normal);
}

.ds-body-sm {
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
}

.ds-body-xs {
    font-size: var(--text-xs);
    line-height: var(--leading-normal);
}

.ds-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-secondary);
}

.ds-mono {
    font-family: var(--font-mono);
}

.ds-text-muted {
    color: var(--color-text-secondary);
}

.ds-text-success { color: var(--color-success); }
.ds-text-warning { color: var(--color-warning); }
.ds-text-danger  { color: var(--color-danger); }
.ds-text-info    { color: var(--color-info); }
.ds-text-accent  { color: var(--color-accent); }

.ds-text-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ds-text-center { text-align: center; }
.ds-text-right  { text-align: right; }
.ds-text-left   { text-align: left; }


/* ============================================================================
   4. LAYOUT SYSTEM
   ============================================================================ */

/* -- Container -- */
.ds-container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-8);
    padding-right: var(--space-8);
}

.ds-container-sm {
    max-width: var(--container-content);
}

/* -- Grid -- */
.ds-grid {
    display: grid;
    gap: var(--space-4);
}

.ds-grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.ds-grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.ds-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.ds-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.ds-grid-cols-5 { grid-template-columns: repeat(5, 1fr); }
.ds-grid-cols-6 { grid-template-columns: repeat(6, 1fr); }

/* Auto-fit responsive grid */
.ds-grid-auto-sm  { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.ds-grid-auto     { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.ds-grid-auto-md  { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.ds-grid-auto-lg  { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

/* Span */
.ds-col-span-2    { grid-column: span 2; }
.ds-col-span-3    { grid-column: span 3; }
.ds-col-span-full { grid-column: 1 / -1; }

/* -- Flex -- */
.ds-flex          { display: flex; }
.ds-flex-inline   { display: inline-flex; }
.ds-flex-col      { display: flex; flex-direction: column; }
.ds-flex-wrap     { flex-wrap: wrap; }
.ds-flex-nowrap   { flex-wrap: nowrap; }

/* Alignment */
.ds-flex-center   { display: flex; align-items: center; justify-content: center; }
.ds-flex-between  { display: flex; align-items: center; justify-content: space-between; }
.ds-flex-start    { display: flex; align-items: flex-start; }
.ds-flex-end      { display: flex; align-items: flex-end; justify-content: flex-end; }

.ds-items-center  { align-items: center; }
.ds-items-start   { align-items: flex-start; }
.ds-items-end     { align-items: flex-end; }
.ds-items-stretch { align-items: stretch; }

.ds-justify-center  { justify-content: center; }
.ds-justify-between { justify-content: space-between; }
.ds-justify-end     { justify-content: flex-end; }
.ds-justify-start   { justify-content: flex-start; }

.ds-flex-1 { flex: 1; }
.ds-flex-auto { flex: auto; }
.ds-flex-none { flex: none; }
.ds-flex-shrink-0 { flex-shrink: 0; }

/* Gap utilities */
.ds-gap-0  { gap: var(--space-0); }
.ds-gap-1  { gap: var(--space-1); }
.ds-gap-2  { gap: var(--space-2); }
.ds-gap-3  { gap: var(--space-3); }
.ds-gap-4  { gap: var(--space-4); }
.ds-gap-5  { gap: var(--space-5); }
.ds-gap-6  { gap: var(--space-6); }
.ds-gap-8  { gap: var(--space-8); }

/* -- Stack (vertical spacing) -- */
.ds-stack > * + * {
    margin-top: var(--space-4);
}

.ds-stack-sm > * + * {
    margin-top: var(--space-2);
}

.ds-stack-lg > * + * {
    margin-top: var(--space-6);
}


/* ============================================================================
   5. BUTTONS
   ============================================================================ */

/* Base button — all buttons should compose from this */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    line-height: 1;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition:
        background var(--transition-base),
        border-color var(--transition-base),
        color var(--transition-base),
        transform var(--transition-base),
        box-shadow var(--transition-base);
    white-space: nowrap;
    user-select: none;
    text-decoration: none;
}

.ds-btn:disabled,
.ds-btn[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.ds-btn:active:not(:disabled) {
    transform: scale(0.98);
}

/* Variants */
.ds-btn-primary {
    background: linear-gradient(135deg, var(--color-accent), var(--ds-primary-400));
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-accent);
}

.ds-btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(8, 145, 178, 0.4);
}

.ds-btn-secondary {
    background: var(--color-surface-overlay);
    color: var(--color-text);
    border-color: var(--color-border);
}

.ds-btn-secondary:hover:not(:disabled) {
    border-color: var(--color-accent);
    background: var(--color-surface);
}

.ds-btn-danger {
    background: var(--color-danger);
    color: white;
    border-color: transparent;
}

.ds-btn-danger:hover:not(:disabled) {
    background: var(--ds-danger-600);
    box-shadow: var(--shadow-danger);
}

.ds-btn-success {
    background: var(--color-success);
    color: white;
    border-color: transparent;
}

.ds-btn-success:hover:not(:disabled) {
    background: var(--ds-success-600);
    box-shadow: var(--shadow-success);
}

.ds-btn-warning {
    background: var(--color-warning);
    color: var(--ds-neutral-900);
    border-color: transparent;
}

.ds-btn-warning:hover:not(:disabled) {
    filter: brightness(1.1);
}

.ds-btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: transparent;
}

.ds-btn-ghost:hover:not(:disabled) {
    background: var(--color-surface-overlay);
    color: var(--color-text);
}

.ds-btn-outline {
    background: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.ds-btn-outline:hover:not(:disabled) {
    background: var(--color-accent-subtle);
}

/* Sizes */
.ds-btn-xs {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
}

.ds-btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
    border-radius: var(--radius-md);
}

.ds-btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-base);
    border-radius: var(--radius-xl);
}

.ds-btn-xl {
    padding: var(--space-5) var(--space-8);
    font-size: var(--text-md);
    border-radius: var(--radius-xl);
}

/* Icon-only button */
.ds-btn-icon {
    padding: var(--space-2);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-lg);
}

.ds-btn-icon.ds-btn-sm {
    width: 28px;
    height: 28px;
    padding: var(--space-1);
}

.ds-btn-icon.ds-btn-lg {
    width: 44px;
    height: 44px;
    padding: var(--space-3);
}

/* Full width */
.ds-btn-block {
    width: 100%;
}

/* Button group */
.ds-btn-group {
    display: inline-flex;
}

.ds-btn-group > .ds-btn {
    border-radius: 0;
}

.ds-btn-group > .ds-btn:first-child {
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.ds-btn-group > .ds-btn:last-child {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.ds-btn-group > .ds-btn + .ds-btn {
    margin-left: -2px;
}

/* Backward compatibility: ensure existing .btn classes still work
   but gain consistent focus states */
.btn:focus-visible,
.ds-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}


/* ============================================================================
   6. FORMS
   ============================================================================ */

/* Form group */
.ds-form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* Label */
.ds-form-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-secondary);
}

.ds-form-label-required::after {
    content: ' *';
    color: var(--color-danger);
}

/* Input base styles (covers input, select, textarea) */
.ds-form-input,
.ds-form-select,
.ds-form-textarea {
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface-overlay);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    transition:
        border-color var(--transition-base),
        box-shadow var(--transition-base);
    width: 100%;
}

.ds-form-input:focus,
.ds-form-select:focus,
.ds-form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.ds-form-input::placeholder,
.ds-form-textarea::placeholder {
    color: var(--color-text-muted);
}

/* Input sizes */
.ds-form-input-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
}

.ds-form-input-lg {
    padding: var(--space-4) var(--space-5);
    font-size: var(--text-base);
}

/* Select */
.ds-form-select option,
select option {
    background: var(--color-surface);
    color: var(--color-text);
}

.ds-form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2394A3B8' viewBox='0 0 16 16'%3E%3Cpath d='M4.646 5.646a.5.5 0 01.708 0L8 8.293l2.646-2.647a.5.5 0 01.708.708l-3 3a.5.5 0 01-.708 0l-3-3a.5.5 0 010-.708z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    padding-right: var(--space-10);
}

/* Textarea */
.ds-form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* Validation states */
.ds-form-input-error,
.ds-form-input.is-invalid {
    border-color: var(--color-danger);
}

.ds-form-input-error:focus,
.ds-form-input.is-invalid:focus {
    box-shadow: 0 0 0 3px var(--color-danger-subtle);
}

.ds-form-input-success,
.ds-form-input.is-valid {
    border-color: var(--color-success);
}

.ds-form-error {
    font-size: var(--text-xs);
    color: var(--color-danger);
    margin-top: var(--space-1);
}

.ds-form-hint {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* Form row (responsive grid) */
.ds-form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

/* Checkbox / Radio */
.ds-form-check {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
}

.ds-form-check input[type="checkbox"],
.ds-form-check input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-accent);
}

/* Toggle switch */
.ds-toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.ds-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.ds-toggle-track {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--color-border);
    border-radius: var(--radius-full);
    transition: background var(--transition-base);
}

.ds-toggle-track::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-base);
}

.ds-toggle input:checked + .ds-toggle-track {
    background: var(--color-accent);
}

.ds-toggle input:checked + .ds-toggle-track::before {
    transform: translateX(20px);
}

.ds-toggle input:focus-visible + .ds-toggle-track {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}


/* ============================================================================
   7. CARDS
   ============================================================================ */

.ds-card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.ds-card-hover:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.ds-card-interactive {
    cursor: pointer;
}

.ds-card-interactive:hover {
    border-color: var(--color-accent);
}

.ds-card-header {
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.ds-card-body {
    padding: var(--space-6);
}

.ds-card-body-compact {
    padding: var(--space-4);
}

.ds-card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
}

/* Card variants */
.ds-card-flat {
    border: none;
    background: var(--color-surface);
}

.ds-card-outlined {
    background: transparent;
    border: 2px solid var(--color-border);
}

.ds-card-accent {
    border-left: 4px solid var(--color-accent);
}

.ds-card-success {
    border-left: 4px solid var(--color-success);
}

.ds-card-warning {
    border-left: 4px solid var(--color-warning);
}

.ds-card-danger {
    border-left: 4px solid var(--color-danger);
}


/* ============================================================================
   8. TABLES
   ============================================================================ */

.ds-table-wrapper {
    width: 100%;
    background: var(--color-surface-raised);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.ds-table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.ds-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.ds-table thead {
    background: var(--color-surface);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.ds-table th {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.ds-table td {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-border-subtle);
    vertical-align: middle;
}

.ds-table tbody tr {
    transition: background var(--transition-fast);
}

/* Striped */
.ds-table-striped tbody tr:nth-child(even) {
    background: var(--color-surface);
}

/* Hoverable */
.ds-table-hover tbody tr:hover {
    background: var(--color-surface-overlay);
}

/* Compact */
.ds-table-compact th,
.ds-table-compact td {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
}

/* Sortable header */
.ds-table th[data-sortable] {
    cursor: pointer;
    user-select: none;
}

.ds-table th[data-sortable]:hover {
    color: var(--color-text);
}

.ds-table th[data-sortable]::after {
    content: ' \2195';
    opacity: 0.4;
    font-size: 0.75em;
}

.ds-table th[data-sort="asc"]::after {
    content: ' \2191';
    opacity: 1;
    color: var(--color-accent);
}

.ds-table th[data-sort="desc"]::after {
    content: ' \2193';
    opacity: 1;
    color: var(--color-accent);
}


/* ============================================================================
   9. MODALS
   ============================================================================ */

.ds-modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: var(--z-modal);
    animation: ds-fadeIn var(--transition-base);
}

.ds-modal-backdrop.show,
.ds-modal-backdrop[open] {
    display: flex;
    align-items: center;
    justify-content: center;
}

.ds-modal {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: ds-slideUp var(--transition-slow);
}

.ds-modal-sm   { max-width: 400px; }
.ds-modal-lg   { max-width: 700px; }
.ds-modal-xl   { max-width: 900px; }
.ds-modal-full { max-width: 95vw; width: 95vw; }

.ds-modal-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.ds-modal-title {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    flex: 1;
}

.ds-modal-close {
    background: none;
    border: none;
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.ds-modal-close:hover {
    background: var(--color-danger);
    color: white;
}

.ds-modal-body {
    padding: var(--space-6);
    color: var(--color-text);
    line-height: var(--leading-relaxed);
}

.ds-modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border);
}


/* ============================================================================
   10. BADGES & TAGS
   ============================================================================ */

.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0.2rem 0.6rem;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-sm);
    line-height: 1.4;
    white-space: nowrap;
}

/* Solid variants */
.ds-badge-primary {
    background: var(--color-accent);
    color: white;
}

.ds-badge-success {
    background: var(--color-success);
    color: white;
}

.ds-badge-warning {
    background: var(--color-warning);
    color: var(--ds-neutral-900);
}

.ds-badge-danger {
    background: var(--color-danger);
    color: white;
}

.ds-badge-info {
    background: var(--color-info);
    color: white;
}

.ds-badge-neutral {
    background: var(--color-border);
    color: var(--color-text-secondary);
}

/* Subtle/soft variants */
.ds-badge-primary-subtle {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    border: 1px solid rgba(8, 145, 178, 0.3);
}

.ds-badge-success-subtle {
    background: var(--color-success-subtle);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.ds-badge-warning-subtle {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.ds-badge-danger-subtle {
    background: var(--color-danger-subtle);
    color: var(--color-danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.ds-badge-info-subtle {
    background: var(--color-info-subtle);
    color: var(--color-info);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Pill shape */
.ds-badge-pill {
    border-radius: var(--radius-full);
    padding: 0.2rem 0.75rem;
}

/* Counter badge (for menu items) */
.ds-badge-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    font-size: 0.7rem;
    font-weight: var(--font-bold);
    background: var(--color-danger);
    color: white;
    border-radius: var(--radius-full);
}

/* Dot indicator */
.ds-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

.ds-dot-sm { width: 6px; height: 6px; }
.ds-dot-lg { width: 12px; height: 12px; }

.ds-dot-success { background: var(--color-success); }
.ds-dot-warning { background: var(--color-warning); }
.ds-dot-danger  { background: var(--color-danger); }
.ds-dot-info    { background: var(--color-info); }
.ds-dot-accent  { background: var(--color-accent); }
.ds-dot-muted   { background: var(--color-text-muted); }

/* Pulsing dot (for live/active status) */
.ds-dot-pulse {
    position: relative;
}

.ds-dot-pulse::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: inherit;
    opacity: 0.4;
    animation: ds-pulse 2s ease-in-out infinite;
}


/* ============================================================================
   11. STAT CARDS
   ============================================================================ */

.ds-stat-card {
    background: var(--color-surface-raised);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.ds-stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.ds-stat-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.ds-stat-value {
    font-family: var(--font-mono);
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-accent);
    line-height: var(--leading-tight);
}

.ds-stat-value-sm {
    font-size: var(--text-xl);
}

.ds-stat-value-lg {
    font-size: var(--text-3xl);
}

.ds-stat-description {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-2);
}

.ds-stat-change {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    margin-top: var(--space-2);
}

.ds-stat-change-up {
    color: var(--color-success);
}

.ds-stat-change-down {
    color: var(--color-danger);
}

/* KPI Card (horizontal layout) */
.ds-kpi-card {
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.ds-kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.ds-kpi-icon {
    font-size: var(--text-3xl);
    line-height: 1;
    flex-shrink: 0;
}


/* ============================================================================
   12. NAVIGATION
   ============================================================================ */

/* Tab navigation */
.ds-tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--color-border);
}

.ds-tab {
    padding: var(--space-3) var(--space-6);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-secondary);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    transition: all var(--transition-base);
    position: relative;
    white-space: nowrap;
}

.ds-tab:hover {
    color: var(--color-text);
}

.ds-tab.active {
    color: var(--color-text);
    font-weight: var(--font-semibold);
}

.ds-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
}

/* Pill tabs */
.ds-tabs-pills {
    display: flex;
    gap: var(--space-2);
    border-bottom: none;
}

.ds-tabs-pills .ds-tab {
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background: var(--color-surface-overlay);
}

.ds-tabs-pills .ds-tab:hover {
    border-color: var(--color-accent);
}

.ds-tabs-pills .ds-tab.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.ds-tabs-pills .ds-tab.active::after {
    display: none;
}

/* Breadcrumbs */
.ds-breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.ds-breadcrumbs a {
    color: var(--color-text-secondary);
}

.ds-breadcrumbs a:hover {
    color: var(--color-accent);
}

.ds-breadcrumbs-separator {
    color: var(--color-text-muted);
}

.ds-breadcrumbs-current {
    color: var(--color-text);
    font-weight: var(--font-medium);
}

/* Pagination */
.ds-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4);
}

.ds-page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--space-3);
    background: var(--color-surface-overlay);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    transition: all var(--transition-base);
}

.ds-page-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.ds-page-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.ds-page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}


/* ============================================================================
   13. ALERTS & TOASTS
   ============================================================================ */

/* Inline alerts */
.ds-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
}

.ds-alert-icon {
    font-size: var(--text-lg);
    flex-shrink: 0;
    line-height: 1;
}

.ds-alert-content {
    flex: 1;
}

.ds-alert-title {
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-1);
}

.ds-alert-success {
    background: var(--color-success-subtle);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.ds-alert-warning {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.ds-alert-error {
    background: var(--color-danger-subtle);
    color: var(--color-danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.ds-alert-info {
    background: var(--color-info-subtle);
    color: var(--color-info);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Toast notifications */
.ds-toast-container {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-width: 400px;
    pointer-events: none;
}

.ds-toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: ds-slideInRight var(--transition-slow);
    pointer-events: auto;
}

.ds-toast-success { border-left: 4px solid var(--color-success); }
.ds-toast-warning { border-left: 4px solid var(--color-warning); }
.ds-toast-error   { border-left: 4px solid var(--color-danger); }
.ds-toast-info    { border-left: 4px solid var(--color-info); }

.ds-toast-icon {
    font-size: var(--text-lg);
    flex-shrink: 0;
}

.ds-toast-body {
    flex: 1;
    font-size: var(--text-sm);
}

.ds-toast-close {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--space-1);
    font-size: var(--text-lg);
    line-height: 1;
}

.ds-toast-close:hover {
    color: var(--color-text);
}

/* Auto-dismiss animation */
.ds-toast-dismiss {
    animation: ds-slideOutRight var(--transition-slow) forwards;
}


/* ============================================================================
   14. TOOLTIPS
   ============================================================================ */

[data-tooltip] {
    position: relative;
}

[data-tooltip]::before,
[data-tooltip]::after {
    position: absolute;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    z-index: var(--z-tooltip);
}

/* Tooltip text */
[data-tooltip]::after {
    content: attr(data-tooltip);
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    padding: var(--space-2) var(--space-3);
    background: var(--ds-neutral-900);
    color: var(--ds-neutral-50);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border-radius: var(--radius-md);
    white-space: nowrap;
    box-shadow: var(--shadow-lg);
}

/* Tooltip arrow */
[data-tooltip]::before {
    content: '';
    bottom: calc(100% + 2px);
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--ds-neutral-900);
}

[data-tooltip]:hover::before,
[data-tooltip]:hover::after,
[data-tooltip]:focus::before,
[data-tooltip]:focus::after {
    opacity: 1;
}

[data-tooltip]:hover::after {
    transform: translateX(-50%) translateY(0);
}

/* Tooltip positions */
[data-tooltip-pos="bottom"]::after {
    bottom: auto;
    top: calc(100% + 8px);
    transform: translateX(-50%) translateY(-4px);
}

[data-tooltip-pos="bottom"]::before {
    bottom: auto;
    top: calc(100% + 2px);
    border: 6px solid transparent;
    border-bottom-color: var(--ds-neutral-900);
    border-top-color: transparent;
}

[data-tooltip-pos="bottom"]:hover::after {
    transform: translateX(-50%) translateY(0);
}


/* ============================================================================
   15. LOADING STATES
   ============================================================================ */

/* Spinner */
.ds-spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: ds-spin 0.8s linear infinite;
}

.ds-spinner-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

.ds-spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

/* Skeleton loading */
.ds-skeleton {
    background: linear-gradient(
        90deg,
        var(--color-surface-overlay) 0%,
        var(--color-surface) 50%,
        var(--color-surface-overlay) 100%
    );
    background-size: 200% 100%;
    animation: ds-shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

.ds-skeleton-text {
    height: 1em;
    width: 100%;
    margin-bottom: var(--space-2);
}

.ds-skeleton-text:last-child {
    width: 70%;
}

.ds-skeleton-heading {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--space-4);
}

.ds-skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.ds-skeleton-card {
    height: 120px;
}

.ds-skeleton-table-row {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr 1fr;
    gap: var(--space-3);
    padding: var(--space-3) 0;
}

.ds-skeleton-table-row > * {
    height: 1em;
}

/* Full-page loading overlay */
.ds-loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    background: rgba(10, 14, 26, 0.8);
    z-index: var(--z-overlay);
    backdrop-filter: blur(4px);
}

.ds-loading-text {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* Progress bar */
.ds-progress {
    width: 100%;
    height: 8px;
    background: var(--color-surface-overlay);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.ds-progress-bar {
    height: 100%;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.ds-progress-bar-success { background: var(--color-success); }
.ds-progress-bar-warning { background: var(--color-warning); }
.ds-progress-bar-danger  { background: var(--color-danger); }

/* Indeterminate progress */
.ds-progress-indeterminate .ds-progress-bar {
    width: 30%;
    animation: ds-indeterminate 1.5s ease-in-out infinite;
}

/* Empty state */
.ds-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    text-align: center;
    color: var(--color-text-secondary);
}

.ds-empty-state-icon {
    font-size: var(--text-4xl);
    opacity: 0.3;
    margin-bottom: var(--space-4);
}

.ds-empty-state-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
    color: var(--color-text);
}

.ds-empty-state-text {
    font-size: var(--text-sm);
    max-width: 400px;
}


/* ============================================================================
   16. SPACING UTILITIES
   ============================================================================ */

/* Margin */
.ds-m-0  { margin: var(--space-0); }
.ds-m-1  { margin: var(--space-1); }
.ds-m-2  { margin: var(--space-2); }
.ds-m-3  { margin: var(--space-3); }
.ds-m-4  { margin: var(--space-4); }
.ds-m-6  { margin: var(--space-6); }
.ds-m-8  { margin: var(--space-8); }

.ds-mt-0  { margin-top: var(--space-0); }
.ds-mt-1  { margin-top: var(--space-1); }
.ds-mt-2  { margin-top: var(--space-2); }
.ds-mt-3  { margin-top: var(--space-3); }
.ds-mt-4  { margin-top: var(--space-4); }
.ds-mt-6  { margin-top: var(--space-6); }
.ds-mt-8  { margin-top: var(--space-8); }

.ds-mb-0  { margin-bottom: var(--space-0); }
.ds-mb-1  { margin-bottom: var(--space-1); }
.ds-mb-2  { margin-bottom: var(--space-2); }
.ds-mb-3  { margin-bottom: var(--space-3); }
.ds-mb-4  { margin-bottom: var(--space-4); }
.ds-mb-6  { margin-bottom: var(--space-6); }
.ds-mb-8  { margin-bottom: var(--space-8); }

.ds-ml-0  { margin-left: var(--space-0); }
.ds-ml-1  { margin-left: var(--space-1); }
.ds-ml-2  { margin-left: var(--space-2); }
.ds-ml-auto { margin-left: auto; }

.ds-mr-0  { margin-right: var(--space-0); }
.ds-mr-1  { margin-right: var(--space-1); }
.ds-mr-2  { margin-right: var(--space-2); }
.ds-mr-auto { margin-right: auto; }

.ds-mx-auto { margin-left: auto; margin-right: auto; }

/* Padding */
.ds-p-0  { padding: var(--space-0); }
.ds-p-1  { padding: var(--space-1); }
.ds-p-2  { padding: var(--space-2); }
.ds-p-3  { padding: var(--space-3); }
.ds-p-4  { padding: var(--space-4); }
.ds-p-6  { padding: var(--space-6); }
.ds-p-8  { padding: var(--space-8); }

.ds-pt-0  { padding-top: var(--space-0); }
.ds-pt-4  { padding-top: var(--space-4); }
.ds-pt-6  { padding-top: var(--space-6); }
.ds-pt-8  { padding-top: var(--space-8); }

.ds-pb-0  { padding-bottom: var(--space-0); }
.ds-pb-4  { padding-bottom: var(--space-4); }
.ds-pb-6  { padding-bottom: var(--space-6); }
.ds-pb-8  { padding-bottom: var(--space-8); }

.ds-px-0  { padding-left: var(--space-0); padding-right: var(--space-0); }
.ds-px-2  { padding-left: var(--space-2); padding-right: var(--space-2); }
.ds-px-4  { padding-left: var(--space-4); padding-right: var(--space-4); }
.ds-px-6  { padding-left: var(--space-6); padding-right: var(--space-6); }
.ds-px-8  { padding-left: var(--space-8); padding-right: var(--space-8); }

.ds-py-0  { padding-top: var(--space-0); padding-bottom: var(--space-0); }
.ds-py-2  { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.ds-py-4  { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.ds-py-6  { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.ds-py-8  { padding-top: var(--space-8); padding-bottom: var(--space-8); }


/* ============================================================================
   17. DISPLAY & VISIBILITY UTILITIES
   ============================================================================ */

.ds-block        { display: block; }
.ds-inline-block { display: inline-block; }
.ds-inline       { display: inline; }
.ds-hidden       { display: none; }
.ds-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;
}

/* Border utilities */
.ds-border         { border: 1px solid var(--color-border); }
.ds-border-0       { border: 0; }
.ds-border-top     { border-top: 1px solid var(--color-border); }
.ds-border-bottom  { border-bottom: 1px solid var(--color-border); }

/* Border radius */
.ds-rounded-none   { border-radius: var(--radius-none); }
.ds-rounded-sm     { border-radius: var(--radius-sm); }
.ds-rounded        { border-radius: var(--radius-lg); }
.ds-rounded-xl     { border-radius: var(--radius-xl); }
.ds-rounded-2xl    { border-radius: var(--radius-2xl); }
.ds-rounded-full   { border-radius: var(--radius-full); }

/* Overflow */
.ds-overflow-hidden  { overflow: hidden; }
.ds-overflow-auto    { overflow: auto; }
.ds-overflow-x-auto  { overflow-x: auto; }
.ds-overflow-y-auto  { overflow-y: auto; }

/* Width/Height */
.ds-w-full   { width: 100%; }
.ds-h-full   { height: 100%; }
.ds-min-h-0  { min-height: 0; }

/* Position */
.ds-relative { position: relative; }
.ds-absolute { position: absolute; }
.ds-fixed    { position: fixed; }
.ds-sticky   { position: sticky; }

/* Opacity */
.ds-opacity-0   { opacity: 0; }
.ds-opacity-50  { opacity: 0.5; }
.ds-opacity-75  { opacity: 0.75; }
.ds-opacity-100 { opacity: 1; }

/* Cursor */
.ds-cursor-pointer   { cursor: pointer; }
.ds-cursor-default   { cursor: default; }
.ds-cursor-not-allowed { cursor: not-allowed; }

/* Background utilities */
.ds-bg-surface  { background: var(--color-surface); }
.ds-bg-raised   { background: var(--color-surface-raised); }
.ds-bg-overlay  { background: var(--color-surface-overlay); }
.ds-bg-accent   { background: var(--color-accent); }

/* Divider */
.ds-divider {
    height: 1px;
    background: var(--color-border);
    border: none;
    margin: var(--space-4) 0;
}


/* ============================================================================
   18. DARK MODE (DEFAULT) / LIGHT MODE TOGGLE
   ============================================================================ */

/* Light mode via class toggle on <html> or <body> */
.theme-light,
[data-theme="light"] {
    --color-bg:             var(--ds-neutral-100);
    --color-surface:        var(--ds-neutral-0);
    --color-surface-raised: var(--ds-neutral-0);
    --color-surface-overlay: var(--ds-neutral-50);
    --color-border:         var(--ds-neutral-200);
    --color-border-subtle:  var(--ds-neutral-100);

    --color-text:           var(--ds-neutral-900);
    --color-text-secondary: var(--ds-neutral-500);
    --color-text-muted:     var(--ds-neutral-400);
    --color-text-inverse:   var(--ds-neutral-0);

    --color-accent-subtle:  rgba(8, 145, 178, 0.1);
    --color-success-subtle: rgba(16, 185, 129, 0.1);
    --color-warning-subtle: rgba(245, 158, 11, 0.1);
    --color-danger-subtle:  rgba(239, 68, 68, 0.1);
    --color-info-subtle:    rgba(59, 130, 246, 0.1);

    /* Backward compat aliases for light mode */
    --primary:        var(--ds-neutral-0);
    --secondary:      var(--ds-neutral-50);
    --text:           var(--ds-neutral-900);
    --text-muted:     var(--ds-neutral-500);
    --border:         var(--ds-neutral-200);
    --bg:             var(--ds-neutral-100);
    --card:           var(--ds-neutral-0);
    --sidebar:        var(--ds-neutral-0);
    --sidebar-active: var(--ds-neutral-50);

    /* Lighter shadows for light mode */
    --shadow-xs:   0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm:   0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-md:   0 4px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg:   0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-xl:   0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-2xl:  0 12px 48px rgba(0, 0, 0, 0.15);
}

/* System preference (auto) */
@media (prefers-color-scheme: light) {
    [data-theme="auto"] {
        --color-bg:             var(--ds-neutral-100);
        --color-surface:        var(--ds-neutral-0);
        --color-surface-raised: var(--ds-neutral-0);
        --color-surface-overlay: var(--ds-neutral-50);
        --color-border:         var(--ds-neutral-200);
        --color-border-subtle:  var(--ds-neutral-100);
        --color-text:           var(--ds-neutral-900);
        --color-text-secondary: var(--ds-neutral-500);
        --color-text-muted:     var(--ds-neutral-400);
        --color-text-inverse:   var(--ds-neutral-0);
        --primary:        var(--ds-neutral-0);
        --secondary:      var(--ds-neutral-50);
        --text:           var(--ds-neutral-900);
        --text-muted:     var(--ds-neutral-500);
        --border:         var(--ds-neutral-200);
        --bg:             var(--ds-neutral-100);
        --card:           var(--ds-neutral-0);
        --sidebar:        var(--ds-neutral-0);
        --sidebar-active: var(--ds-neutral-50);
    }
}


/* ============================================================================
   19. ANIMATIONS
   ============================================================================ */

@keyframes ds-fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes ds-fadeOut {
    from { opacity: 1; }
    to   { opacity: 0; }
}

@keyframes ds-slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes ds-slideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes ds-slideInRight {
    from { opacity: 0; transform: translateX(100%); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes ds-slideOutRight {
    from { opacity: 1; transform: translateX(0); }
    to   { opacity: 0; transform: translateX(100%); }
}

@keyframes ds-slideInLeft {
    from { opacity: 0; transform: translateX(-20px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes ds-spin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

@keyframes ds-pulse {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50%      { opacity: 0; transform: scale(1.8); }
}

@keyframes ds-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

@keyframes ds-indeterminate {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}

/* Animation utilities */
.ds-animate-fadeIn    { animation: ds-fadeIn var(--transition-base); }
.ds-animate-slideUp   { animation: ds-slideUp var(--transition-slow); }
.ds-animate-slideDown { animation: ds-slideDown var(--transition-slow); }

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}


/* ============================================================================
   20. PRINT STYLES
   ============================================================================ */

@media print {
    body {
        background: white !important;
        color: black !important;
        font-size: 12pt;
    }

    .sidebar,
    .top-header,
    .mobile-menu-toggle,
    .sidebar-overlay,
    .ds-toast-container,
    .ds-modal-backdrop,
    .no-print {
        display: none !important;
    }

    .main-content {
        margin-left: 0 !important;
    }

    .ds-card,
    .ds-stat-card,
    .ds-table-wrapper {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }

    a {
        color: inherit !important;
        text-decoration: underline;
    }

    .ds-btn {
        display: none !important;
    }
}


/* ============================================================================
   21. RESPONSIVE BREAKPOINTS
   ============================================================================ */

/*
   Breakpoints:
   - sm:  640px
   - md:  768px
   - lg:  1024px
   - xl:  1280px
   - 2xl: 1536px
*/

/* ---- Tablet and below (max 1024px) ---- */
@media (max-width: 1024px) {
    .ds-grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .ds-grid-cols-3 { grid-template-columns: repeat(2, 1fr); }

    .ds-hide-lg { display: none; }
}

/* ---- Mobile (max 768px) ---- */
@media (max-width: 768px) {
    :root {
        --space-8: 1.5rem;
    }

    .ds-container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }

    .ds-grid-cols-2,
    .ds-grid-cols-3,
    .ds-grid-cols-4,
    .ds-grid-cols-5,
    .ds-grid-cols-6 {
        grid-template-columns: 1fr;
    }

    .ds-col-span-2,
    .ds-col-span-3 {
        grid-column: auto;
    }

    .ds-form-row {
        grid-template-columns: 1fr;
    }

    .ds-modal {
        width: 95%;
        margin: var(--space-4);
    }

    .ds-modal-footer {
        flex-direction: column;
    }

    .ds-modal-footer .ds-btn {
        width: 100%;
    }

    .ds-toast-container {
        left: var(--space-4);
        max-width: none;
    }

    /* Touch-friendly targets */
    .ds-btn,
    .ds-tab,
    .ds-page-btn {
        min-height: 44px;
        min-width: 44px;
    }

    .ds-hide-md { display: none; }
    .ds-show-md { display: block; }
}

/* ---- Small mobile (max 480px) ---- */
@media (max-width: 480px) {
    .ds-hide-sm { display: none; }

    .ds-stat-value {
        font-size: var(--text-lg);
    }

    .ds-pagination {
        gap: var(--space-1);
    }

    .ds-page-btn {
        min-width: 32px;
        height: 32px;
        padding: 0 var(--space-2);
        font-size: var(--text-xs);
    }
}

/* ---- Show-only helpers ---- */
.ds-show-md,
.ds-show-sm {
    display: none;
}


/* ============================================================================
   APPENDIX: BACKWARD COMPATIBILITY PATCHES
   ============================================================================

   These rules ensure the existing codebase classes continue to work correctly
   while picking up design token improvements. They do NOT override the
   existing style.css / components.css / views.css — they fill gaps.
   ============================================================================ */

/* Ensure --info variable exists (was missing in old :root) */
:root {
    --info: var(--ds-info-500);
}

/* Give existing .form-input the focus ring if it was not defined */
.form-input:focus,
.filter-input:focus,
.filter-select:focus {
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

/* Ensure existing modal-content scrolls on small screens */
.modal-content {
    max-height: 90vh;
    overflow-y: auto;
}

/* Accessibility: existing buttons get focus-visible ring */
button:focus-visible,
[type="button"]:focus-visible,
[type="submit"]:focus-visible,
[type="reset"]:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}