/* 
 * Responsive Design Enhancements for Skilloxy Institute Management System
 * Professional Educational Theme with Modern Responsive Components
 */

/* Enhanced CSS Variables for Responsive Design */
:root {
    /* Educational Theme Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --educational-blue: #1e3a8a;
    --educational-purple: #7c3aed;
    --educational-teal: #0d9488;
    --educational-orange: #ea580c;
    
    /* Professional Spacing */
    --section-spacing: 5rem;
    --component-spacing: 2rem;
    --content-max-width: 1200px;
    
    /* Enhanced Animations */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Typography Enhancements */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 400;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Enhanced Header with Responsive Navigation */
.modern-navbar {
    background: linear-gradient(90deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.95) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition-base);
}

.modern-navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.98);
}

.navbar-brand-enhanced {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-brand-enhanced .brand-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

/* Responsive Navigation Menu */
.nav-menu-responsive {
    display: flex;
    align-items: center;
    gap: 1rem;
}

@media (max-width: 991.98px) {
    .nav-menu-responsive {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
        margin-top: 1rem;
    }
}

.nav-link-enhanced {
    position: relative;
    font-weight: 500;
    color: var(--gray-600) !important;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius);
    transition: var(--transition-base);
}

.nav-link-enhanced:hover {
    color: var(--primary-color) !important;
    background-color: rgba(102, 126, 234, 0.1);
}

.nav-link-enhanced.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

/* Modern Hero Section */
.hero-section {
    background: var(--primary-gradient);
    padding: 8rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.hero-section::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 1000 100" fill="rgba(255,255,255,0.1)"><polygon points="1000,0 1000,100 0,100"/></svg>') no-repeat;
    background-size: cover;
    opacity: 0.1;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

@media (max-width: 768px) {
    .hero-section {
        padding: 6rem 0 4rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
}

/* Enhanced Cards with Animations */
.card-modern {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: var(--transition-base);
    overflow: hidden;
    border: none;
}

.card-modern:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.card-modern .card-header {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    padding: 1.5rem;
}

.card-modern .card-body {
    padding: 1.5rem;
}

/* Course Cards */
.course-card {
    position: relative;
    overflow: hidden;
    border-radius: 1rem;
    background: white;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: var(--transition-base);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.course-card-image {
    height: 200px;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
}

.course-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.course-card:hover .course-card-image img {
    transform: scale(1.1);
}

.course-card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-base);
}

.course-card:hover .course-card-overlay {
    opacity: 1;
}

.course-price-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--success-gradient);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Dashboard Components */
.dashboard-stat-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.dashboard-stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.dashboard-stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.stat-icon.primary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}

.stat-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.stat-icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.stat-icon.info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info-color);
}

/* Modern Tables */
.table-modern {
    background: white;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    border: none;
}

.table-modern thead th {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border: none;
    padding: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.table-modern tbody td {
    padding: 1.25rem;
    vertical-align: middle;
    border: none;
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
}

.table-modern tbody tr:last-child td {
    border-bottom: none;
}

.table-modern tbody tr:hover {
    background-color: rgba(102, 126, 234, 0.05);
}

/* Enhanced Forms */
.form-modern .form-control {
    border: 2px solid rgba(226, 232, 240, 0.8);
    border-radius: 0.75rem;
    padding: 0.875rem 1.25rem;
    font-size: 0.95rem;
    transition: var(--transition-base);
    background-color: rgba(248, 250, 252, 0.5);
}

.form-modern .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    background-color: white;
}

.form-modern .form-label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

/* Enhanced Buttons */
.btn-modern {
    border-radius: 0.75rem;
    padding: 0.875rem 2rem;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-base);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-modern::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: left 0.5s;
}

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

.btn-gradient-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(102, 126, 234, 0.3);
}

.btn-gradient-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(102, 126, 234, 0.4);
}

.btn-gradient-success {
    background: var(--success-gradient);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(79, 172, 254, 0.3);
}

/* Responsive Grid System */
.responsive-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

@media (max-width: 768px) {
    .responsive-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

/* Mobile-First Responsive Utilities */
.mobile-hidden {
    display: block;
}

@media (max-width: 768px) {
    .mobile-hidden {
        display: none !important;
    }
}

.mobile-only {
    display: none;
}

@media (max-width: 768px) {
    .mobile-only {
        display: block !important;
    }
}

/* Enhanced Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-scale {
    animation: fadeInScale 0.5s ease-out;
}

/* Loading States */
.loading-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

/* Enhanced Footer */
.footer-modern {
    background: var(--dark-color);
    color: var(--gray-300);
    padding: 3rem 0 2rem;
    margin-top: var(--section-spacing);
}

.footer-modern .footer-brand {
    font-weight: 700;
    font-size: 1.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.footer-modern .footer-links {
    list-style: none;
    padding: 0;
}

.footer-modern .footer-links li {
    margin-bottom: 0.5rem;
}

.footer-modern .footer-links a {
    color: var(--gray-300);
    transition: var(--transition-base);
}

.footer-modern .footer-links a:hover {
    color: white;
}

/* Print Styles */
@media print {
    .modern-navbar,
    .footer-modern,
    .mobile-only,
    .btn,
    .no-print {
        display: none !important;
    }
    
    .hero-section {
        background: white !important;
        color: black !important;
        padding: 2rem 0 !important;
    }
    
    .card-modern {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
        break-inside: avoid;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000EE;
        --success-color: #008000;
        --danger-color: #FF0000;
        --warning-color: #FF8C00;
    }
    
    .card-modern,
    .dashboard-stat-card,
    .table-modern {
        border: 2px solid #000;
    }
}

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