/* ============================================
   COMPLETE CSS MASTER FILE - ALL WEBSITE SECTIONS
   Optimized, Cleaned & Organized
   ============================================ */

/* ====================
   CSS VARIABLES (DESIGN TOKENS)
   ==================== */
:root {
    /* Primary Colors */
    --primary: #2c3e50;
    --primary-dark: #1a252f;
    --primary-light: #34495e;
    
    /* Secondary Colors */
    --secondary: #3498db;
    --secondary-dark: #2980b9;
    --secondary-light: #5dade2;
    
    /* Accent Colors */
    --accent: #e74c3c;
    --accent-dark: #c0392b;
    --accent-light: #ec7063;
    
    /* Status Colors */
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
    --info: #3498db;
    
    /* Neutral Colors */
    --light: #ecf0f1;
    --dark: #2c3e50;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Text Colors */
    --text: #333333;
    --text-light: #7f8c8d;
    --text-dark: #2c3e50;
    
    /* Effects */
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 6px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    --transition-slow: all 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-circle: 50%;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Typography */
    --font-family-base: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-family-heading: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --line-height-base: 1.6;
    --line-height-heading: 1.3;
}

/* ====================
   RESET & BASE STYLES
   ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-base);
    line-height: var(--line-height-base);
    color: var(--text);
    background-color: var(--white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

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

a:hover {
    color: var(--secondary-dark);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ====================
   LAYOUT & CONTAINERS
   ==================== */
.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container { max-width: 540px; }
}

@media (min-width: 768px) {
    .container { max-width: 720px; }
}

@media (min-width: 992px) {
    .container { max-width: 960px; }
}

@media (min-width: 1200px) {
    .container { max-width: 1140px; }
}

.section {
    padding: var(--spacing-xxl) 0;
}

.section-sm {
    padding: var(--spacing-xl) 0;
}

.section-lg {
    padding: 4rem 0;
}

/* ====================
   HEADER & NAVIGATION
   ==================== */
.top-bar {
    background: var(--primary);
    color: var(--white);
    padding: 8px 0;
    font-size: 0.9rem;
}

.navbar {
    padding: var(--spacing-md) 0;
    transition: var(--transition);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand span {
    color: var(--secondary);
}

.navbar-brand:hover {
    color: var(--primary);
}

/* Navigation Styles */
.navbar-nav .nav-item {
    position: relative;
    margin: 0 var(--spacing-xs);
}

.navbar-nav .nav-link {
    position: relative;
    padding: 0.5rem 1rem !important;
    font-weight: 500;
    color: var(--text) !important;
    transition: var(--transition);
    z-index: 1;
    border-radius: var(--radius-sm);
}

.navbar-nav .nav-link:hover {
    color: var(--text) !important;
    background-color: rgba(52, 152, 219, 0.1);
}

/* Hover Effect - High Underline */
.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 3px;
    background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
    border-radius: var(--radius-sm);
    transform: translateX(-50%);
    transition: var(--transition);
    opacity: 0;
}

.navbar-nav .nav-link:hover::after {
    width: 80%;
    opacity: 1;
}

/* Active State */
.navbar-nav .nav-link.active {
    color: var(--secondary) !important;
    font-weight: 600;
}

.navbar-nav .nav-link.active::after {
    width: 80%;
    opacity: 1;
    background: var(--secondary);
}

/* Click Effect */
.navbar-nav .nav-link:focus {
    animation: navPulse 0.4s ease;
    outline: none;
}

@keyframes navPulse {
    0% { box-shadow: 0 0 0 0 rgba(52, 152, 219, 0.3); }
    70% { box-shadow: 0 0 0 6px rgba(52, 152, 219, 0); }
    100% { box-shadow: 0 0 0 0 rgba(52, 152, 219, 0); }
}

/* Alternative Navigation Styles */
.navbar-nav .nav-link.thin-underline::after {
    height: 2px;
    background: var(--secondary);
}

.navbar-nav .nav-link.thick-underline::after {
    height: 6px;
    bottom: -4px;
    background: linear-gradient(90deg, var(--secondary), #4ecdc4);
}

/* Navigation CTA Button */
.nav-cta-btn {
    font-size: 1rem !important;
    font-weight: 500 !important;
    padding: 0.5rem 1.5rem !important;
    border-radius: var(--radius-md) !important;
    border: 2px solid var(--secondary) !important;
    background: transparent !important;
    color: var(--secondary) !important;
    position: relative !important;
    transition: var(--transition) !important;
    height: auto !important;
    white-space: nowrap !important;
    margin-left: var(--spacing-md) !important;
}

.nav-cta-btn:hover {
    background: var(--secondary) !important;
    color: var(--white) !important;
    transform: translateY(-2px);
}

.nav-cta-btn::after {
    display: none !important;
}

/* Mobile Navigation */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background: var(--white);
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        margin-top: var(--spacing-md);
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem !important;
        margin: 0;
    }
    
    .navbar-nav .nav-link::after {
        bottom: 8px;
        height: 2px;
    }
    
    .navbar-nav .nav-link:hover::after,
    .navbar-nav .nav-link.active::after {
        width: 90%;
    }
    
    .nav-cta-btn {
        margin: var(--spacing-md) 0 0 0 !important;
        width: 100%;
        text-align: center;
    }
}

/* ====================
   HERO SECTION
   ==================== */
.hero {
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.9), rgba(44, 62, 80, 0.8)), url("../img/background.jpg");
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--white);
    padding: 180px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, rgba(52, 152, 219, 0.1));
    pointer-events: none;
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ====================
   COMMON COMPONENTS
   ==================== */
/* Section Titles */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    position: relative;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-md);
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    border-radius: 2px;
}

.section-title p {
    color: var(--text-light);
    max-width: 700px;
    margin: var(--spacing-md) auto 0;
    font-size: 1.1rem;
    line-height: 1.7;
}

.section-subtitle {
    font-size: 1.8rem;
    color: var(--primary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    font-weight: 600;
}

.section-subtitle::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--secondary);
    margin: var(--spacing-sm) auto;
    border-radius: var(--radius-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    color: var(--white);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--secondary-dark), var(--secondary));
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--primary);
    color: var(--white);
    border: none;
}

.btn-secondary:hover {
    background: var(--primary-dark);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline-primary:hover {
    background: var(--secondary);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

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

.btn-outline-secondary:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
}

.btn-accent {
    background: var(--accent);
    color: var(--white);
    border: none;
}

.btn-accent:hover {
    background: var(--accent-dark);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-icon {
    padding: 0.5rem;
    width: 40px;
    height: 40px;
}

/* Cards */
.card {
    border: none;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    background: var(--white);
    position: relative;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

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

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

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

.card-footer {
    background: transparent;
    border-top: 1px solid var(--gray-200);
    padding: var(--spacing-md) var(--spacing-lg);
}

/* ====================
   SPECIFIC COMPONENTS
   ==================== */
/* Category Cards */
.category-card {
    padding: var(--spacing-xl);
    text-align: center;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    background: var(--white);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    height: 100%;
    border: 1px solid var(--gray-200);
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.category-card:hover::before {
    transform: scaleX(1);
}

.category-card:hover {
    transform: translateY(-10px);
    border-color: var(--secondary-light);
}

.category-icon {
    font-size: 3rem;
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
    transition: var(--transition);
}

.category-card:hover .category-icon {
    transform: scale(1.1);
    color: var(--accent);
}

/* Course Cards */
.course-card {
    border: none;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    background: var(--white);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.course-image {
    height: 200px;
    overflow: hidden;
    position: relative;
}

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

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

.course-level {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--secondary);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    z-index: 2;
}

.course-level.beginner { background: var(--success); }
.course-level.intermediate { background: var(--warning); }
.course-level.advanced { background: var(--danger); }

.course-details {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
    padding-top: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.course-detail {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
    min-width: 70px;
}

.course-detail i {
    color: var(--secondary);
    margin-bottom: 0.25rem;
    font-size: 1.2rem;
}

.course-detail span {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 500;
}

/* Testimonials */
.testimonials-section {
    background: var(--light);
    position: relative;
}

.testimonial-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
    position: relative;
    border: 1px solid var(--gray-200);
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 4rem;
    color: var(--secondary-light);
    opacity: 0.3;
    font-family: Georgia, serif;
    line-height: 1;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--secondary-light);
}

.testimonial-text {
    font-style: italic;
    margin-bottom: var(--spacing-lg);
    color: var(--text-light);
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-circle);
    overflow: hidden;
    border: 3px solid var(--secondary-light);
}

.testimonial-info h4 {
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.testimonial-info p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin: 0;
}

/* Gallery */
.gallery-section {
    background: var(--white);
}

.gallery-card {
    transition: var(--transition);
    overflow: hidden;
    border-radius: var(--radius-md);
    position: relative;
    height: 300px;
}

.gallery-thumbnail {
    width: 80px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    transition: var(--transition);
    cursor: pointer;
}

.gallery-thumbnail:hover,
.gallery-thumbnail.active {
    border-color: var(--secondary);
    transform: scale(1.05);
}

.gallery-image {
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: relative;
}

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

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(transparent, rgba(44, 62, 80, 0.9));
    opacity: 0;
    transition: var(--transition);
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-lg);
    color: var(--white);
}

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

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

#gallery-filters .btn {
    border-radius: 20px;
    padding: 0.5rem 1.5rem;
    margin: 0 0.25rem 0.5rem;
    border: 1px solid var(--gray-300);
    color: var(--text-light);
    background: transparent;
}

#gallery-filters .btn:hover,
#gallery-filters .btn.active {
    background: var(--secondary);
    color: var(--white);
    border-color: var(--secondary);
    transform: translateY(-2px);
}

.gallery-item {
    display: block;
    transition: var(--transition);
}

.gallery-item.hidden {
    display: none;
}

/* Team Section */
.team-card {
    transition: var(--transition);
    border: none;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    background: var(--white);
}

.team-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.team-image {
    height: 250px;
    overflow: hidden;
    position: relative;
}

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

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

.team-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(52, 152, 219, 0.9));
    opacity: 0;
    transition: var(--transition);
    padding: var(--spacing-lg);
    color: var(--white);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

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

.team-overlay p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    color: rgba(255, 255, 255, 0.9);
}

.team-overlay .social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.team-overlay .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-circle);
    color: var(--white);
    transition: var(--transition);
}

.team-overlay .social-links a:hover {
    background: var(--white);
    color: var(--secondary);
    transform: translateY(-3px);
}

/* Course Tabs */
.course-tabs {
    border-bottom: 1px solid var(--gray-300);
    margin-bottom: var(--spacing-xl);
}

.course-tabs .nav-link {
    color: var(--text-light);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
    background: transparent;
    position: relative;
    margin-bottom: -1px;
}

.course-tabs .nav-link:hover {
    color: var(--secondary);
    background: rgba(52, 152, 219, 0.1);
}

.course-tabs .nav-link.active {
    color: var(--secondary);
    background: transparent;
    border-bottom: 3px solid var(--secondary);
}

/* ====================
   FOOTER
   ==================== */
footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: var(--spacing-xxl) 0 var(--spacing-md);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
}

.footer-column {
    margin-bottom: var(--spacing-xl);
}

.footer-column h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-sm);
    color: var(--white);
}

.footer-column h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 3px;
    background: var(--secondary);
    border-radius: var(--radius-sm);
}

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

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-links a:hover {
    color: var(--secondary);
    padding-left: 5px;
}

.footer-links a i {
    width: 20px;
    text-align: center;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-circle);
    color: var(--white);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--secondary);
    transform: translateY(-3px);
    color: var(--white);
}

.contact-info {
    list-style: none;
    padding: 0;
    margin: 0;
}

.contact-info li {
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.contact-info i {
    color: var(--secondary);
    margin-top: 0.25rem;
    min-width: 20px;
}

.contact-info span {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

/* ====================
   UTILITY CLASSES
   ==================== */
/* Empty States */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--gray-300);
}

.empty-state i {
    font-size: 4rem;
    color: var(--gray-500);
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    color: var(--gray-600);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--gray-600);
    max-width: 500px;
    margin: 0 auto;
}

.placeholder-image {
    width: 100%;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    color: var(--gray-500);
    font-size: 3rem;
}

/* Backgrounds */
.bg-light { background-color: var(--light) !important; }
.bg-dark { background-color: var(--dark) !important; color: var(--white); }
.bg-primary { background-color: var(--primary) !important; color: var(--white); }
.bg-secondary { background-color: var(--secondary) !important; color: var(--white); }
.bg-accent { background-color: var(--accent) !important; color: var(--white); }

/* Text Colors */
.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--secondary) !important; }
.text-accent { color: var(--accent) !important; }
.text-light { color: var(--text-light) !important; }
.text-white { color: var(--white) !important; }

/* Spacing Utilities */
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-1 { margin-top: var(--spacing-sm) !important; }
.mb-1 { margin-bottom: var(--spacing-sm) !important; }
.mt-2 { margin-top: var(--spacing-md) !important; }
.mb-2 { margin-bottom: var(--spacing-md) !important; }
.mt-3 { margin-top: var(--spacing-lg) !important; }
.mb-3 { margin-bottom: var(--spacing-lg) !important; }
.mt-4 { margin-top: var(--spacing-xl) !important; }
.mb-4 { margin-bottom: var(--spacing-xl) !important; }
.mt-5 { margin-top: var(--spacing-xxl) !important; }
.mb-5 { margin-bottom: var(--spacing-xxl) !important; }

.pt-0 { padding-top: 0 !important; }
.pb-0 { padding-bottom: 0 !important; }
.pt-1 { padding-top: var(--spacing-sm) !important; }
.pb-1 { padding-bottom: var(--spacing-sm) !important; }
.pt-2 { padding-top: var(--spacing-md) !important; }
.pb-2 { padding-bottom: var(--spacing-md) !important; }
.pt-3 { padding-top: var(--spacing-lg) !important; }
.pb-3 { padding-bottom: var(--spacing-lg) !important; }
.pt-4 { padding-top: var(--spacing-xl) !important; }
.pb-4 { padding-bottom: var(--spacing-xl) !important; }
.pt-5 { padding-top: var(--spacing-xxl) !important; }
.pb-5 { padding-bottom: var(--spacing-xxl) !important; }

/* Animations */
@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(calc(-150px * 10)); }
}

.floating {
    animation: floating 3s ease-in-out infinite;
}

@keyframes floating {
    0% { transform: translate(0, 0px); }
    50% { transform: translate(0, 15px); }
    100% { transform: translate(0, -0px); }
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.bounce-in {
    animation: bounceIn 1s;
}

@keyframes bounceIn {
    0% { transform: scale(0.1); opacity: 0; }
    60% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); }
}

.fade-in {
    animation: fadeIn 0.8s ease-out;
}

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

.slide-in-left {
    animation: slideInLeft 0.8s ease-out;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

.slide-in-right {
    animation: slideInRight 0.8s ease-out;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Custom Hover Effects */
.hover-lift {
    transition: var(--transition);
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.hover-glow:hover {
    box-shadow: 0 0 15px rgba(52, 152, 219, 0.5);
}

.hover-rotate:hover {
    transform: rotate(5deg);
}

.hover-scale:hover {
    transform: scale(1.05);
}

.hover-shadow:hover {
    box-shadow: var(--shadow-lg);
}

/* Modal Styling */
.modal-content {
    border-radius: var(--radius-lg);
    border: none;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border-bottom: none;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--spacing-lg);
}

.modal-title {
    color: var(--white);
    font-weight: 600;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    border-top: 1px solid var(--gray-200);
    padding: var(--spacing-lg);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* Form Styling */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-dark);
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--white);
    background-clip: padding-box;
    border: 1px solid var(--gray-400);
    border-radius: var(--radius-md);
    transition: var(--transition);
    appearance: none;
}

.form-control:focus {
    color: var(--text);
    background-color: var(--white);
    border-color: var(--secondary);
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(52, 152, 219, 0.25);
}

.form-control::placeholder {
    color: var(--gray-500);
    opacity: 1;
}

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

.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-check-input {
    width: 1.2em;
    height: 1.2em;
    margin: 0;
}

.form-check-label {
    margin-bottom: 0;
    cursor: pointer;
}

/* ====================
   RESPONSIVE DESIGN
   ==================== */
@media (max-width: 767.98px) {
    /* Typography */
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.25rem; }
    
    .hero h1 { font-size: 2.5rem; }
    .section-title h2 { font-size: 2rem; }
    
    /* Layout */
    .section { padding: var(--spacing-xl) 0; }
    .section-lg { padding: 3rem 0; }
    
    /* Hero */
    .hero {
        padding: 120px 0 60px;
        background-attachment: scroll;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
        margin-bottom: var(--spacing-sm);
    }
    
    /* Cards */
    .course-details {
        justify-content: center;
        gap: var(--spacing-md);
    }
    
    .course-detail {
        min-width: 100px;
    }
    
    /* Navigation */
    .navbar-nav .nav-link {
        text-align: center;
    }
    
    /* Footer */
    footer {
        padding: var(--spacing-xl) 0 var(--spacing-md);
    }
    
    .footer-column {
        text-align: center;
    }
    
    .footer-column h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .footer-links a:hover {
        padding-left: 0;
        transform: translateX(5px);
    }
    
    .social-links {
        justify-content: center;
    }
    
    .contact-info li {
        justify-content: center;
        text-align: center;
    }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    .hero h1 { font-size: 3rem; }
    .section-title h2 { font-size: 2.25rem; }
    
    .course-detail {
        min-width: 80px;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-buttons,
    .social-links,
    .footer-bottom,
    .btn,
    .modal,
    .course-tabs {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .container {
        max-width: 100% !important;
        padding: 0 !important;
    }
    
    .card,
    .course-card,
    .testimonial-card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
    
    a {
        color: #000 !important;
        text-decoration: underline !important;
    }
    
    a[href]:after {
        content: " (" attr(href) ")";
        font-size: 0.9em;
        font-weight: normal;
    }
}