/* ============================================================================
   CONTENTCRAFTER AI - ENTERPRISE DESIGN SYSTEM
   ============================================================================
   A comprehensive, scalable design system for enterprise-level UI consistency

   Structure:
   1. Design Tokens (Colors, Typography, Spacing, Shadows, etc.)
   2. Base Styles (Reset, Typography, Layout)
   3. Component Library (Buttons, Cards, Forms, Navigation, etc.)
   4. Utility Classes (Spacing, Display, Flexbox, etc.)
   5. Page Layouts (Dashboard, Forms, Detail Views)
   ============================================================================ */


/* ============================================================================
   1. DESIGN TOKENS
   ============================================================================ */

:root {
    /* ===== DARK MODE DESIGN SYSTEM ===== */

    /* Background Colors - Using original color scheme */
    --bg-primary: #0B1929;
    --bg-secondary: #101E36;
    --bg-tertiary: #232936;
    --bg-card: #1A2341;
    --bg-hover: #232936;
    --bg-main: #0B1929;

    /* Border Colors */
    --border-color: #2F3C5E;
    --border-subtle: #1A202C;
    --border: #2F3C5E;

    /* Text Colors */
    --text-primary: #E3EAF5;
    --text-secondary: #A1B0CC;
    --text-tertiary: #8492A8;
    --text-inverse: #F7FAFC;

    /* Primary Brand - Modern Vibrant Gradient */
    --color-primary-50: #F0F9FF;
    --color-primary-100: #E0F2FE;
    --color-primary-200: #C7D2FE;
    --color-primary-300: #A5B4FC;
    --color-primary-400: #818CF8;
    --color-primary-500: #6366F1;  /* Main brand color - vibrant indigo */
    --color-primary-600: #4F46E5;
    --color-primary-700: #4338CA;
    --color-primary-800: #3730A3;
    --color-primary-900: #312E81;

    /* Accent - Vibrant Cyan/Teal */
    --color-accent-400: #22D3EE;
    --color-accent-500: #06B6D4;
    --color-accent-600: #0891B2;

    /* Semantic Colors - More Vibrant */
    --color-success-50: #F0FDF4;
    --color-success-200: #86EFAC;
    --color-success-500: #22C55E;  /* Brighter green */
    --color-success-600: #16A34A;

    --color-warning-50: #FFFBEB;
    --color-warning-200: #FED7AA;
    --color-warning-500: #FB923C;  /* Warmer orange */
    --color-warning-600: #EA580C;

    --color-error-50: #FEF2F2;
    --color-error-200: #FCA5A5;
    --color-error-500: #F43F5E;  /* More vibrant red-pink */
    --color-error-600: #E11D48;

    --color-info-50: #EFF6FF;
    --color-info-200: #BFDBFE;
    --color-info-500: #3B82F6;
    --color-info-600: #2563EB;

    /* Interactive Colors for Dark Mode */
    --interactive-primary: var(--color-primary-500);
    --interactive-primary-hover: var(--color-primary-600);
    --interactive-secondary: var(--bg-tertiary);
    --interactive-secondary-hover: #2D3748;

    /* ===== TYPOGRAPHY ===== */

    /* Font Families */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */

    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* ===== SPACING SCALE ===== */
    /* Based on 4px grid (0.25rem) */
    --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 */
    --space-24: 6rem;     /* 96px */

    /* ===== BORDER RADIUS ===== */
    --radius-none: 0;
    --radius-sm: 0.25rem;   /* 4px */
    --radius-base: 0.5rem;  /* 8px */
    --radius-md: 0.625rem;  /* 10px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */
    --radius-2xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;

    /* ===== ELEVATION (SHADOWS) ===== */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-base: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

    /* ===== TRANSITIONS ===== */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* ===== Z-INDEX SCALE ===== */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;

    /* ===== BREAKPOINTS ===== */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;


    /* Focus */
    --focus-ring: 0 0 0 3px var(--color-primary-200);
    --focus-ring-error: 0 0 0 3px var(--color-error-200);
}

/* Dark Mode Overrides */
[data-theme="dark"] {
    --bg-primary: var(--color-dark-bg);
    --bg-secondary: var(--color-dark-bg-secondary);
    --bg-tertiary: var(--color-dark-bg-tertiary);
    --bg-card: var(--color-dark-bg-secondary);
    --bg-elevated: var(--color-dark-bg-tertiary);

    --border-color: var(--color-dark-border);
    --border-color-light: rgba(255, 255, 255, 0.05);
    --border-color-strong: rgba(255, 255, 255, 0.15);

    --text-primary: var(--color-dark-text);
    --text-secondary: var(--color-dark-text-secondary);
    --text-tertiary: var(--color-gray-500);
    --text-disabled: var(--color-gray-600);

    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.3);
    --shadow-base: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.5);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.6);
}


/* ============================================================================
   2. BASE STYLES
   ============================================================================ */

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

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

a:hover {
    color: var(--interactive-primary-hover);
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--bg-secondary);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
}


/* ============================================================================
   3. COMPONENT LIBRARY
   ============================================================================ */

/* ===== BUTTONS ===== */

.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: var(--leading-none);
    white-space: nowrap;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    user-select: none;
    outline: none;
}

.ds-btn:focus-visible {
    box-shadow: var(--focus-ring);
}

.ds-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Button Sizes */
.ds-btn-xs {
    height: 1.75rem;
    padding: 0 var(--space-3);
    font-size: var(--text-xs);
}

.ds-btn-sm {
    height: 2rem;
    padding: 0 var(--space-3);
    font-size: var(--text-sm);
}

.ds-btn-md {
    height: 2.5rem;
    padding: 0 var(--space-4);
    font-size: var(--text-sm);
}

.ds-btn-lg {
    height: 3rem;
    padding: 0 var(--space-6);
    font-size: var(--text-base);
}

/* Button Variants */
.ds-btn-primary {
    background: var(--interactive-primary);
    color: var(--text-inverse);
    border-color: var(--interactive-primary);
}

.ds-btn-primary:hover:not(:disabled) {
    background: var(--interactive-primary-hover);
    border-color: var(--interactive-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.ds-btn-primary:active:not(:disabled) {
    background: var(--interactive-primary-active);
    transform: translateY(0);
}

.ds-btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
}

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

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

.ds-btn-ghost:hover:not(:disabled) {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.ds-btn-danger {
    background: var(--color-error-500);
    color: var(--text-inverse);
    border-color: var(--color-error-500);
}

.ds-btn-danger:hover:not(:disabled) {
    background: var(--color-error-700);
    border-color: var(--color-error-700);
}

.ds-btn-success {
    background: var(--color-success-500);
    color: var(--text-inverse);
    border-color: var(--color-success-500);
}

.ds-btn-success:hover:not(:disabled) {
    background: var(--color-success-700);
    border-color: var(--color-success-700);
}

/* ===== CARDS ===== */

.ds-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.ds-card-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-color);
}

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

.ds-card-footer {
    padding: var(--space-6);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.ds-card-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin: 0;
}

.ds-card-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-top: var(--space-2);
}

/* Card Variants */
.ds-card-elevated {
    box-shadow: var(--shadow-md);
}

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

.ds-card-interactive:hover {
    border-color: var(--interactive-primary);
    box-shadow: var(--shadow-lg);
}

/* ===== FORMS ===== */

.ds-form-group {
    margin-bottom: var(--space-6);
}

.ds-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.ds-label-required::after {
    content: " *";
    color: var(--color-error-500);
}

.ds-input {
    display: block;
    width: 100%;
    height: 2.5rem;
    padding: 0 var(--space-3);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.ds-input:hover {
    border-color: var(--border-color-strong);
}

.ds-input:focus {
    border-color: var(--interactive-primary);
    box-shadow: var(--focus-ring);
}

.ds-input::placeholder {
    color: var(--text-disabled);
}

.ds-input:disabled {
    background: var(--bg-secondary);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Input Sizes */
.ds-input-sm {
    height: 2rem;
    font-size: var(--text-xs);
}

.ds-input-lg {
    height: 3rem;
    font-size: var(--text-base);
}

/* Textarea */
.ds-textarea {
    min-height: 5rem;
    padding: var(--space-3);
    resize: vertical;
}

/* Select */
.ds-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    background-size: 12px;
    padding-right: var(--space-8);
}

/* Checkbox & Radio */
.ds-checkbox,
.ds-radio {
    width: 1rem;
    height: 1rem;
    accent-color: var(--interactive-primary);
    cursor: pointer;
}

/* Helper Text */
.ds-helper-text {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-2);
}

/* Error State */
.ds-input-error {
    border-color: var(--color-error-500);
}

.ds-input-error:focus {
    box-shadow: var(--focus-ring-error);
}

.ds-error-text {
    font-size: var(--text-xs);
    color: var(--color-error-500);
    margin-top: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

/* ===== BADGES ===== */

.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    line-height: var(--leading-none);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.ds-badge-primary {
    background: rgba(139, 92, 246, 0.15);
    color: var(--color-primary-400);
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.ds-badge-secondary {
    background: rgba(156, 163, 175, 0.15);
    color: var(--color-gray-400);
    border: 1px solid rgba(156, 163, 175, 0.3);
}

.ds-badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: #34D399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.ds-badge-warning {
    background: rgba(245, 158, 11, 0.15);
    color: #FBBF24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.ds-badge-error {
    background: rgba(239, 68, 68, 0.15);
    color: #F87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.ds-badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: #60A5FA;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* ===== ALERTS ===== */

.ds-alert {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border-left: 4px solid;
    display: flex;
    gap: var(--space-3);
}

.ds-alert-success {
    background: var(--color-success-50);
    border-color: var(--color-success-500);
    color: var(--color-success-700);
}

.ds-alert-warning {
    background: var(--color-warning-50);
    border-color: var(--color-warning-500);
    color: var(--color-warning-700);
}

.ds-alert-error {
    background: var(--color-error-50);
    border-color: var(--color-error-500);
    color: var(--color-error-700);
}

.ds-alert-info {
    background: var(--color-info-50);
    border-color: var(--color-info-500);
    color: var(--color-info-700);
}

/* ===== MODALS ===== */

.ds-modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: none;
    align-items: center;
    justify-content: center;
}

.ds-modal.active {
    display: flex;
}

.ds-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    animation: fadeIn var(--transition-fast);
}

.ds-modal-content {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 90vw;
    max-height: 90vh;
    overflow: auto;
    animation: slideUp var(--transition-base);
    z-index: calc(var(--z-modal) + 1);
}

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

.ds-modal-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
    margin: 0;
}

.ds-modal-close {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-base);
    transition: all var(--transition-fast);
}

.ds-modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

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

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

/* Modal Sizes */
.ds-modal-sm { width: 400px; }
.ds-modal-md { width: 600px; }
.ds-modal-lg { width: 800px; }
.ds-modal-xl { width: 1000px; }

/* ===== NAVIGATION ===== */

.ds-tabs {
    display: flex;
    gap: var(--space-1);
    border-bottom: 1px solid var(--border-color);
}

.ds-tab {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.ds-tab:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
    border-radius: var(--radius-base) var(--radius-base) 0 0;
}

.ds-tab-active {
    color: var(--interactive-primary);
    border-bottom-color: var(--interactive-primary);
}

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

.ds-breadcrumb-separator {
    color: var(--text-tertiary);
}

.ds-breadcrumb-link {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.ds-breadcrumb-link:hover {
    color: var(--interactive-primary);
}

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

/* ===== EMPTY STATES ===== */

.ds-empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.ds-empty-state-icon {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

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

.ds-empty-state-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

/* ===== AVATARS ===== */

.ds-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--color-primary-100);
    color: var(--color-primary-700);
    font-weight: var(--font-medium);
    overflow: hidden;
}

.ds-avatar-xs { width: 1.5rem; height: 1.5rem; font-size: var(--text-xs); }
.ds-avatar-sm { width: 2rem; height: 2rem; font-size: var(--text-sm); }
.ds-avatar-md { width: 2.5rem; height: 2.5rem; font-size: var(--text-base); }
.ds-avatar-lg { width: 3rem; height: 3rem; font-size: var(--text-lg); }
.ds-avatar-xl { width: 4rem; height: 4rem; font-size: var(--text-xl); }

.ds-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ===== DIVIDERS ===== */

.ds-divider {
    height: 1px;
    background: var(--border-color);
    border: none;
    margin: var(--space-6) 0;
}

.ds-divider-vertical {
    width: 1px;
    height: auto;
    background: var(--border-color);
    margin: 0 var(--space-4);
}


/* ============================================================================
   4. UTILITY CLASSES
   ============================================================================ */

/* ===== SPACING UTILITIES ===== */

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

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

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

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

/* ===== DISPLAY UTILITIES ===== */

.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-grid { display: grid; }

/* ===== FLEXBOX UTILITIES ===== */

.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }

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

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

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ===== TEXT UTILITIES ===== */

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

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }

.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

/* ===== ANIMATIONS ===== */

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

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

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

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

@keyframes spin {
    to { transform: rotate(360deg); }
}

.animate-fade-in { animation: fadeIn var(--transition-base); }
.animate-slide-up { animation: slideUp var(--transition-base); }
.animate-slide-down { animation: slideDown var(--transition-base); }
.animate-spin { animation: spin 1s linear infinite; }


/* ============================================================================
   5. PAGE LAYOUTS
   ============================================================================ */

/* Container */
.ds-container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.ds-container-fluid {
    width: 100%;
    padding: 0 var(--space-6);
}

/* Page Header */
.ds-page-header {
    padding: var(--space-8) 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-8);
}

.ds-page-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
}

.ds-page-description {
    font-size: var(--text-lg);
    color: var(--text-secondary);
}

/* Grid System */
.ds-grid {
    display: grid;
    gap: var(--space-6);
}

.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); }

/* Responsive Grid */
@media (max-width: 768px) {
    .ds-grid-cols-2,
    .ds-grid-cols-3,
    .ds-grid-cols-4 {
        grid-template-columns: 1fr;
    }
}

/* Two Column Layout (Sidebar + Main) */
.ds-layout-sidebar {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--space-8);
    min-height: 100vh;
}

.ds-sidebar {
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    padding: var(--space-6);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.ds-main-content {
    padding: var(--space-8);
}

/* Split View */
.ds-split-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    height: 100vh;
}

.ds-split-panel {
    overflow-y: auto;
    padding: var(--space-6);
}


/* ============================================================================
   6. RESPONSIVE UTILITIES
   ============================================================================ */

/* Mobile First Approach */
@media (min-width: 640px) {
    .sm\:d-block { display: block; }
    .sm\:d-flex { display: flex; }
    .sm\:d-grid { display: grid; }
}

@media (min-width: 768px) {
    .md\:d-block { display: block; }
    .md\:d-flex { display: flex; }
    .md\:d-grid { display: grid; }
}

@media (min-width: 1024px) {
    .lg\:d-block { display: block; }
    .lg\:d-flex { display: flex; }
    .lg\:d-grid { display: grid; }
}