/* CSS Variables for Theme System */
:root {
    /* Light Theme Colors */
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --accent-color: #333333;
    --text-primary: #000000;
    --text-secondary: #666666;
    --text-muted: #999999;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --footer-bg: #000000;
    --footer-text: #ffffff;
    --btn-primary-bg: #000000;
    --btn-primary-text: #ffffff;
    --btn-outline-border: #000000;
    --btn-outline-text: #000000;
    --feature-card-bg: #ffffff;
    --hero-gradient: linear-gradient(135deg, #000000 0%, #333333 100%);
    --text-gradient: linear-gradient(135deg, #000000 0%, #333333 100%);
}

[data-theme="dark"] {
    /* Dark Theme Colors */
    --primary-color: #ffffff;
    --secondary-color: #000000;
    --accent-color: #cccccc;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;
    --bg-primary: #000000;
    --bg-secondary: #111111;
    --bg-tertiary: #222222;
    --border-color: #333333;
    --shadow-color: rgba(255, 255, 255, 0.1);
    --card-bg: #111111;
    --navbar-bg: rgba(0, 0, 0, 0.95);
    --footer-bg: #ffffff;
    --footer-text: #000000;
    --btn-primary-bg: #ffffff;
    --btn-primary-text: #000000;
    --btn-outline-border: #ffffff;
    --btn-outline-text: #ffffff;
    --feature-card-bg: #111111;
    --hero-gradient: linear-gradient(135deg, #ffffff 0%, #cccccc 100%);
    --text-gradient: linear-gradient(135deg, #ffffff 0%, #cccccc 100%);
}

/* Global Styles */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background-color: var(--navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-brand {
    color: var(--text-primary) !important;
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar-nav .nav-link {
    color: var(--text-primary) !important;
    font-weight: 500;
    margin: 0 0.5rem;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover {
    color: var(--accent-color) !important;
}

.navbar-toggler {
    border-color: var(--border-color);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 0, 0, 0.55)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

[data-theme="dark"] .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.55)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Buttons */
.btn-primary {
    background-color: var(--btn-primary-bg);
    border-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.btn-outline-primary {
    border-color: var(--btn-outline-border);
    color: var(--btn-outline-text);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background-color: var(--btn-outline-border);
    color: var(--btn-primary-text);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

/* Hero Section */
.hero-section {
    background: var(--bg-secondary);
    padding-top: 100px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--hero-gradient);
    opacity: 0.05;
    z-index: 1;
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

.text-gradient {
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-image {
    font-size: 15rem;
    color: var(--primary-color);
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Features Section */
.feature-card {
    background-color: var(--feature-card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    transition: all 0.3s ease;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow-color);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--hero-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 2rem;
    color: var(--btn-primary-text);
}

.feature-card h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Competition Cards */
.competition-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
    height: 100%;
    position: relative;
    overflow: hidden;
}

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

.competition-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow-color);
}

.competition-card h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.competition-info {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.competition-info i {
    color: var(--primary-color);
    margin-right: 0.5rem;
}

/* Contact Section */
.contact-info {
    color: var(--text-secondary);
}

.contact-info i {
    color: var(--primary-color);
    font-size: 1.2rem;
    width: 20px;
}

.contact-form .form-control {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
}

.contact-form .form-control:focus {
    background-color: var(--bg-secondary);
    border-color: var(--primary-color);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(0, 0, 0, 0.1);
}

.contact-form .form-control::placeholder {
    color: var(--text-muted);
}

/* Footer */
.footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    border-top: 1px solid var(--border-color);
}

.social-links a {
    color: var(--footer-text);
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-color);
}

/* Theme Toggle Button */
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: rotate(180deg);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding-top: 80px;
    }
    
    .hero-image {
        font-size: 8rem;
    }
    
    .display-3 {
        font-size: 2.5rem;
    }
    
    .display-5 {
        font-size: 2rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}