/* Modern Layout System - 2025 */
/* ================================= */

:root {
    /* Modern Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Neutral Colors */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Spacing System */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Typography */
    --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* Modern Grid System */
/* ================== */
.modern-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

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

.modern-grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.modern-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.modern-grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Modern Card System */
/* ================== */
.modern-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--gray-200);
}

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

.modern-card-header {
    padding: var(--space-xl);
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.modern-card-body {
    padding: var(--space-xl);
}

.modern-card-footer {
    padding: var(--space-lg) var(--space-xl);
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

/* Modern Hero Section */
/* =================== */
.modern-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    overflow: hidden;
}

.modern-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.modern-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
}

.modern-hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, white 0%, rgba(255,255,255,0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modern-hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    font-weight: 400;
    line-height: 1.6;
    margin-bottom: var(--space-2xl);
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Modern Button System */
/* ==================== */
.modern-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.modern-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition-slow);
}

.modern-btn:hover::before {
    left: 100%;
}

.modern-btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-md);
}

.modern-btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.modern-btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.modern-btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.modern-btn-large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

/* Modern Section System */
/* ===================== */
.modern-section {
    padding: var(--space-4xl) 0;
}

.modern-section-sm {
    padding: var(--space-2xl) 0;
}

.modern-section-lg {
    padding: var(--space-4xl) 0;
}

.modern-section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.modern-section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    color: var(--gray-900);
}

.modern-section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Modern Navigation */
/* ================= */
.modern-nav {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition-normal);
}

.modern-nav.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.modern-nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    max-width: 1280px;
    margin: 0 auto;
}

.modern-nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.modern-nav-links {
    display: flex;
    gap: var(--space-xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.modern-nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.modern-nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-fast);
}

.modern-nav-link:hover {
    color: var(--primary-color);
}

.modern-nav-link:hover::after {
    width: 100%;
}

/* Modern Form Elements */
/* ==================== */
.modern-form-group {
    margin-bottom: var(--space-lg);
}

.modern-form-label {
    display: block;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-sm);
}

.modern-form-input {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: var(--transition-fast);
    background: white;
}

.modern-form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.modern-form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Modern Utilities */
/* ================ */
.modern-text-center { text-align: center; }
.modern-text-left { text-align: left; }
.modern-text-right { text-align: right; }

.modern-mb-0 { margin-bottom: 0; }
.modern-mb-1 { margin-bottom: var(--space-xs); }
.modern-mb-2 { margin-bottom: var(--space-sm); }
.modern-mb-3 { margin-bottom: var(--space-md); }
.modern-mb-4 { margin-bottom: var(--space-lg); }
.modern-mb-5 { margin-bottom: var(--space-xl); }

.modern-mt-0 { margin-top: 0; }
.modern-mt-1 { margin-top: var(--space-xs); }
.modern-mt-2 { margin-top: var(--space-sm); }
.modern-mt-3 { margin-top: var(--space-md); }
.modern-mt-4 { margin-top: var(--space-lg); }
.modern-mt-5 { margin-top: var(--space-xl); }

.modern-p-0 { padding: 0; }
.modern-p-1 { padding: var(--space-xs); }
.modern-p-2 { padding: var(--space-sm); }
.modern-p-3 { padding: var(--space-md); }
.modern-p-4 { padding: var(--space-lg); }
.modern-p-5 { padding: var(--space-xl); }

/* Responsive Design */
/* ================= */
@media (max-width: 768px) {
    .modern-container {
        padding: 0 var(--space-md);
    }
    
    .modern-grid-2,
    .modern-grid-3,
    .modern-grid-4 {
        grid-template-columns: 1fr;
    }
    
    .modern-nav-links {
        display: none;
    }
    
    .modern-hero {
        min-height: 80vh;
    }
    
    .modern-section {
        padding: var(--space-2xl) 0;
    }
    
    .modern-card-body {
        padding: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .modern-hero-title {
        font-size: 2rem;
    }
    
    .modern-hero-subtitle {
        font-size: 1rem;
    }
    
    .modern-btn {
        width: 100%;
        justify-content: center;
    }
}

/* Animation Classes */
/* ================ */
.modern-fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-slow);
}

.modern-fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.modern-slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.modern-slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.modern-slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: var(--transition-slow);
}

.modern-slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Dark Mode Support */
/* ================= */
@media (prefers-color-scheme: dark) {
    :root {
        --gray-50: #0f172a;
        --gray-100: #1e293b;
        --gray-200: #334155;
        --gray-300: #475569;
        --gray-400: #64748b;
        --gray-500: #94a3b8;
        --gray-600: #cbd5e1;
        --gray-700: #e2e8f0;
        --gray-800: #f1f5f9;
        --gray-900: #f8fafc;
    }
    
    .modern-card {
        background: var(--gray-100);
        border-color: var(--gray-200);
    }
    
    .modern-nav {
        background: rgba(15, 23, 42, 0.95);
        border-color: var(--gray-200);
    }
}