/* Dark Theme Styles */
:root {
    --primary-color: #fb923c;
    --primary-dark: #f97316;
    --primary-light: #fed7aa;
    --secondary-color: #fbbf24;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-alt: #f3f4f6;
    --border-color: #e5e7eb;
    --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);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary-color: #fb923c;
    --primary-dark: #f97316;
    --primary-light: #fed7aa;
    --secondary-color: #67e8f9;
    --success-color: #34d399;
    --warning-color: #fbbf24;
    --error-color: #f87171;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-alt: #374151;
    --border-color: #4b5563;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}

/* Theme Toggle Button */
.theme-toggle {
    position: relative;
}

.theme-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    color: white;
    font-size: 1.2rem;
    position: relative;
    overflow: hidden;
}

.theme-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: left 0.5s;
}

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

.theme-btn:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-lg);
}

.theme-btn:active {
    transform: scale(0.95) rotate(-5deg);
}

/* Language Toggle Button */
.lang-toggle {
    margin-left: 1rem;
}

.lang-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 25px;
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.lang-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: left 0.5s;
}

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

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

/* Navigation Controls */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Dark Theme Specific Styles */
[data-theme="dark"] .main-header {
    background: var(--bg-primary);
}

[data-theme="dark"] .nav {
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .hero {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

[data-theme="dark"] .hero:before {
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.05" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,165.3C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
}

[data-theme="dark"] .section-alt {
    background: var(--bg-secondary);
}

[data-theme="dark"] .program-card,
[data-theme="dark"] .about-card,
[data-theme="dark"] .info-card,
[data-theme="dark"] .topic-item,
[data-theme="dark"] .registration-form,
[data-theme="dark"] .curriculum-tabs,
[data-theme="dark"] .faq-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .footer {
    background: linear-gradient(135deg, #0f172a 0%, #020617 100%);
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group select:focus {
    background: var(--bg-primary);
}

/* Enhanced Animations for Theme Toggle */
@keyframes themeRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.theme-btn.switching {
    animation: themeRotate 0.6s ease-in-out;
}

/* Smooth Theme Transition */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Loading Screen Theme */
[data-theme="dark"] .loading-screen {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

[data-theme="dark"] .loading-logo {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

[data-theme="dark"] .loading-text {
    color: var(--text-primary);
}

[data-theme="dark"] .loading-bar {
    background: var(--bg-alt);
}

[data-theme="dark"] .loading-progress {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

/* Modal Theme */
[data-theme="dark"] .modal-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .modal-icon {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

/* Particles.js Dark Theme */
[data-theme="dark"] #particles-js canvas {
    opacity: 0.6;
}

/* Enhanced Button Styles in Dark Theme */
[data-theme="dark"] .btn-secondary {
    background: var(--bg-primary);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] .btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn-outline:hover {
    background: var(--primary-color);
    color: var(--bg-primary);
}

/* Tab Styles Dark Theme */
[data-theme="dark"] .tab-btn {
    color: var(--text-secondary);
}

[data-theme="dark"] .tab-btn.active {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

[data-theme="dark"] .tab-btn.active:after {
    background: var(--primary-color);
}

/* Stats Animation */
.stat-number {
    display: inline-block;
    font-weight: 700;
    transition: var(--transition);
}

.stat-number.counting {
    animation: countUp 2s ease-out;
}

@keyframes countUp {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Floating Icons Enhanced */
.floating-icon {
    position: absolute;
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.8);
    animation: float 6s ease-in-out infinite;
    transition: var(--transition);
}

[data-theme="dark"] .floating-icon {
    color: rgba(129, 140, 248, 0.8);
}

.floating-icon:hover {
    transform: scale(1.2) rotate(10deg);
    color: var(--primary-color);
}

/* Hero Background Animation */
.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, 
        rgba(99, 102, 241, 0.1) 0%, 
        rgba(34, 211, 238, 0.1) 50%, 
        rgba(99, 102, 241, 0.1) 100%);
    animation: gradientShift 8s ease-in-out infinite;
    z-index: 0;
}

@keyframes gradientShift {
    0%, 100% { transform: translateX(0) translateY(0); }
    25% { transform: translateX(-20px) translateY(20px); }
    50% { transform: translateX(20px) translateY(-20px); }
    75% { transform: translateX(-10px) translateY(10px); }
}

[data-theme="dark"] .hero-bg-animation {
    background: linear-gradient(45deg, 
        rgba(129, 140, 248, 0.05) 0%, 
        rgba(103, 232, 249, 0.05) 50%, 
        rgba(129, 140, 248, 0.05) 100%);
}

/* Rotating Ring Animation */
.rotating-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 250px;
    height: 250px;
    border: 3px solid transparent;
    border-top: 3px solid var(--primary-color);
    border-right: 3px solid var(--secondary-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: rotate 10s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

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

[data-theme="dark"] .glass-effect {
    background: rgba(17, 24, 39, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Mobile Menu Theme */
[data-theme="dark"] .nav-menu.active {
    background: var(--bg-primary);
    box-shadow: var(--shadow-xl);
}

/* Responsive Theme Adjustments */
@media (max-width: 768px) {
    .nav-controls {
        gap: 0.25rem;
    }
    
    .theme-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
    }
}

/* Theme Transition Animation */
@keyframes themeTransition {
    0% { opacity: 1; }
    50% { opacity: 0.8; }
    100% { opacity: 1; }
}

body.theme-transitioning {
    animation: themeTransition 0.3s ease-in-out;
}

/* Custom Scrollbar for Dark Theme */
[data-theme="dark"] ::-webkit-scrollbar {
    width: 8px;
}

[data-theme="dark"] ::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}

/* Selection Colors */
::selection {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] ::selection {
    background: var(--primary-dark);
    color: white;
}

/* Focus States */
.btn:focus,
input:focus,
select:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Enhanced Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(-45deg, #f97316, #fb923c, #fed7aa, #fbbf24);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-logo {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, white, rgba(255,255,255,0.8));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--primary-color);
    animation: pulse 2s infinite;
}

.loading-text {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    font-family: 'Poppins', sans-serif;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.loading-progress {
    height: 100%;
    background: linear-gradient(90deg, white, var(--secondary-color));
    border-radius: 2px;
    animation: loadingProgress 2s ease-out forwards;
}

@keyframes loadingProgress {
    0% { width: 0%; }
    100% { width: 100%; }
}