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

/* ================================
   CSS Variables - Design System
   ================================ */
:root {
    /* Colors - Primary Gradient */
    --color-primary: #667eea;
    --color-primary-2: #764ba2;
    --color-primary-dark: #5568d3;
    --color-primary-light: #7c94ff;
    
    /* Colors - Accent */
    --color-accent-purple: #c471ed;
    --color-accent-pink: #fa709a;
    --color-accent-teal: #38f9d7;
    --color-accent-green: #43e97b;
    --color-accent-orange: #f5af19;
    --color-accent-blue: #4facfe;
    
    /* Colors - Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Colors - Semantic */
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-info: #3b82f6;
    --color-info-light: #dbeafe;
    
    /* Spacing Scale */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.3);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;
    --font-size-4xl: 36px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 600ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Z-Index */
    --z-dropdown: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
    --z-sidebar: 100;
    --z-bottom-nav: 200;
}

/* ================================
   Global Styles
   ================================ */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-gray-800);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ================================
   Layout Primitives
   ================================ */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.grid {
    display: grid;
    gap: var(--space-4);
}

.flex {
    display: flex;
}

.flex-col {
    display: flex;
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.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-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }

/* ================================
   Card Component
   ================================ */
.card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-5);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-2));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover::before {
    opacity: 1;
}

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

.card-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-2) 100%);
    color: var(--color-white);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: inherit;
}

.card-primary .card-title {
    color: var(--color-white);
}

.card-icon {
    font-size: var(--font-size-2xl);
    opacity: 0.8;
}

.card-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.card-link:hover {
    color: var(--color-primary-dark);
    transform: translateX(2px);
}

.card-body {
    position: relative;
}

/* ================================
   Metric Components
   ================================ */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-4);
}

.metric-tile {
    text-align: center;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.card:not(.card-primary) .metric-tile {
    background: var(--color-gray-50);
}

.metric-tile:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.15);
}

.card:not(.card-primary) .metric-tile:hover {
    background: var(--color-gray-100);
}

.metric-label {
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.8;
    margin-bottom: var(--space-2);
    font-weight: var(--font-weight-semibold);
}

.metric-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
}

.card:not(.card-primary) .metric-value {
    color: var(--color-primary);
}

/* ================================
   Stat Badges
   ================================ */
.stat-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-purple {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-2));
    color: var(--color-white);
}

.badge-gray {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

.badge-green {
    background: var(--color-success-light);
    color: var(--color-success);
}

.badge-orange {
    background: var(--color-warning-light);
    color: var(--color-warning);
}

/* ================================
   Trend Pills
   ================================ */
.trend-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.trend-up {
    background: var(--color-success-light);
    color: var(--color-success);
}

.trend-down {
    background: var(--color-error-light);
    color: var(--color-error);
}

.trend-neutral {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

/* ================================
   Loading Skeletons
   ================================ */
@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes skeleton-shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.skeleton-text {
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.1) 25%,
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0.1) 75%
    );
    background-size: 1000px 100%;
    animation: skeleton-shimmer 2s infinite;
    border-radius: var(--radius-sm);
    color: transparent !important;
    cursor: wait;
}

.card:not(.card-primary) .skeleton-text {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 25%,
        var(--color-gray-300) 50%,
        var(--color-gray-200) 75%
    );
    background-size: 1000px 100%;
}

.skeleton-circle {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 25%,
        var(--color-gray-300) 50%,
        var(--color-gray-200) 75%
    );
    background-size: 1000px 100%;
    animation: skeleton-shimmer 2s infinite;
    border-radius: var(--radius-full);
}

.skeleton-item {
    pointer-events: none;
    animation: skeleton-pulse 2s infinite;
}

/* ================================
   Buttons
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-2));
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

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

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    background: var(--color-white);
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.btn-icon:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.btn-icon:active {
    transform: scale(0.95);
}

/* ================================
   Pulse Animation
   ================================ */
@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
    }
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-success);
    animation: pulse-glow 2s infinite;
}

/* ================================
   Glassmorphism Effect
   ================================ */
.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.glass-dark {
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ================================
   Gradient Text
   ================================ */
.gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ================================
   Responsive Breakpoints
   ================================ */
/* Mobile first approach */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
    .container {
        padding: 0 var(--space-5);
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    :root {
        --font-size-xs: 13px;
        --font-size-sm: 15px;
        --font-size-base: 16px;
        --font-size-lg: 19px;
        --font-size-xl: 22px;
        --font-size-2xl: 26px;
        --font-size-3xl: 32px;
        --font-size-4xl: 40px;
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .container {
        padding: 0 var(--space-6);
    }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        padding: 0 var(--space-8);
    }
}

/* ================================
   Utility Classes
   ================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.hidden { display: none !important; }

/* ================================
   Scrollbar Styling
   ================================ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-400);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-500);
}