/* ==================== UNIFIED DESIGN SYSTEM ==================== */

/* ========== COLOR PALETTE & CSS VARIABLES ========== */
:root {
    /* Primary Colors - Modern Blue-Teal */
    --primary: #0066cc;
    --primary-dark: #0052a3;
    --primary-light: #1980ff;
    
    /* Secondary Colors - Vibrant Cyan */
    --secondary: #00d9ff;
    --secondary-dark: #00a8cc;
    
    /* Accent Colors */
    --accent: #00d9ff;
    --success: #00d084;
    --warning: #ffb800;
    --error: #ff6b6b;
    --info: #1e90ff;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light-bg: #f5f7ff;
    --light-bg-2: #eef4ff;
    --gray-50: #fafbfc;
    --gray-100: #f3f5f9;
    --gray-200: #e5eaf4;
    --gray-300: #d1d9eb;
    --gray-400: #9ca7bf;
    --gray-500: #6b7494;
    --gray-600: #4b5573;
    --gray-700: #2d3748;
    --gray-800: #1a202c;
    --text-dark: #0f1419;
    --text-light: #555d77;
    --text-lighter: #8a94a8;
    --border-color: #d5dce8;
    
    /* Admin Specific */
    --admin-dark: #0b2e59;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
    --spacing-3xl: 48px;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ========== RESET & GLOBAL STYLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: linear-gradient(135deg, #f8faff 0%, #f0f6ff 50%, #e8f1ff 100%);
    font-family: 'Segoe UI', 'Helvetica Neue', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    letter-spacing: 0.3px;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 48px;
}

h2 {
    font-size: 36px;
}

h3 {
    font-size: 28px;
}

h4 {
    font-size: 22px;
}

h5 {
    font-size: 18px;
}

h6 {
    font-size: 16px;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

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

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

a:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ========== BUTTONS ========== */
button, .btn {
    font-family: inherit;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--radius-md);
    font-weight: 600;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 14px;
}

button:focus, .btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

button:active, .btn:active {
    transform: scale(0.98);
}

/* Primary Button */
.btn-primary, button.primary {
    background: var(--primary);
    color: var(--white);
}

.btn-primary:hover, button.primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 119, 182, 0.3);
}

/* Secondary Button */
.btn-secondary, button.secondary {
    background: var(--secondary);
    color: var(--white);
}

.btn-secondary:hover, button.secondary:hover {
    background: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 180, 216, 0.3);
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-ghost:hover {
    background: var(--light-bg);
    transform: translateY(-2px);
}

/* ========== CARDS ========== */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 2px 8px rgba(6, 102, 204, 0.08);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 24px rgba(6, 102, 204, 0.15);
    border-color: var(--primary-light);
}

.card-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.card-header h2 {
    margin-bottom: 0;
}

.card-body {
    margin-bottom: var(--spacing-lg);
}

.card-footer {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* ========== CONTAINERS ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* ========== FLEX UTILITIES ========== */
.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ========== GRID UTILITIES ========== */
.grid {
    display: grid;
}

.grid-auto-fit {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

/* ========== SPACING UTILITIES ========== */
.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }

.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.ml-lg { margin-left: var(--spacing-lg); }
.mr-lg { margin-right: var(--spacing-lg); }

/* ========== TEXT UTILITIES ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-light { color: var(--text-light); }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-sm { font-size: 14px; }
.text-base { font-size: 16px; }
.text-lg { font-size: 18px; }
.text-xl { font-size: 20px; }
.text-2xl { font-size: 24px; }

/* ========== VISIBILITY ========== */
.hidden { display: none !important; }
.visible { display: block !important; }

/* ========== RESPONSIVE UTILITIES ========== */
@media (max-width: 768px) {
    h1 { font-size: 36px; }
    h2 { font-size: 28px; }
    h3 { font-size: 22px; }
    h4 { font-size: 18px; }
    
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 480px) {
    h1 { font-size: 28px; }
    h2 { font-size: 22px; }
    h3 { font-size: 18px; }
    
    body {
        font-size: 14px;
    }
}