/* ==================== VARIABLES ==================== */
:root {
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-alt: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --accent-primary: #0066cc;
    --accent-secondary: #0052a3;
    --border-color: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-alt: #242424;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --accent-primary: #4da3ff;
    --accent-secondary: #3385ff;
    --border-color: #404040;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

/* ==================== CONTAINER ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* ==================== NAVIGATION ==================== */
.navbar {
    background-color: var(--bg-secondary);
    padding: var(--spacing-sm) 0;
    box-shadow: 0 2px 10px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo h2 {
    color: var(--accent-primary);
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.nav-links a:hover {
    background-color: var(--bg-alt);
    color: var(--accent-primary);
}

.nav-controls {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.btn-icon, .btn-lang {
    background-color: var(--accent-primary);
    color: white;
    border: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

.btn-icon:hover, .btn-lang:hover {
    background-color: var(--accent-secondary);
}

/* ==================== HERO SECTIONS ==================== */
.hero {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
}

.hero-small {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: var(--spacing-md) 0;
    text-align: center;
}

.hero-small h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

/* ==================== SECTIONS ==================== */
.section {
    padding: var(--spacing-lg) 0;
}

.section.bg-alt {
    background-color: var(--bg-alt);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
    color: var(--accent-primary);
}

.text-center {
    text-align: center;
}

/* ==================== TEAM CONTENT ==================== */
.team-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

/* ==================== GALLERY ==================== */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.gallery-item {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px var(--shadow);
    transition: transform 0.3s ease;
}

.gallery-item:hover {
    transform: translateY(-5px);
}

.gallery-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

/* ==================== COMPETITION CARD ==================== */
.competition-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.competition-info h3 {
    color: var(--accent-primary);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}

.competition-date, .competition-location {
    font-size: 1.125rem;
    margin: var(--spacing-xs) 0;
}

/* ==================== SOCIAL LINKS ==================== */
.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 10px;
    font-weight: 600;
    font-size: 1.125rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    color: white;
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px var(--shadow);
}

.social-btn.instagram {
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
}

.social-btn.youtube {
    background: #facbcb;
}

.social-btn.linkedin {
    background: #8496afbe;
}

/* ==================== PARTNERS PAGE ==================== */
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background-color: var(--accent-primary);
    color: white;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.partner-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 4px 15px var(--shadow);
    transition: transform 0.3s ease;
}

.partner-card:hover {
    transform: translateY(-5px);
}

.partner-card.featured {
    border: 3px solid var(--accent-primary);
}

.partner-logo {
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.partner-logo img {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
}

.partner-card h3 {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

.btn-small {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--accent-primary);
    color: white;
    border-radius: 5px;
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
}

.btn-small:hover {
    background-color: var(--accent-secondary);
}

/* ==================== ROBOT PAGE ==================== */
.robot-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    align-items: center;
}

.robot-image {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px var(--shadow);
}

.robot-description p {
    font-size: 1.125rem;
    line-height: 1.8;
}

.build-stage {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--shadow);
}

.stage-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-primary);
    min-width: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stage-content {
    flex: 1;
}

.stage-content h3 {
    color: var(--accent-primary);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}

.stage-content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.stage-images {
    margin-top: var(--spacing-sm);
    border-radius: 8px;
    overflow: hidden;
}

.stage-images img {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
}

.tech-stack {
    background-color: var(--bg-alt);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-md) 0;
}

.tech-stack h4 {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
}

.tech-stack ul {
    list-style: none;
    padding-left: 0;
}

.tech-stack li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-color);
}

.tech-stack li:last-child {
    border-bottom: none;
}

.github-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

/* ==================== FOOTER ==================== */
.footer {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-link {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 1.25rem;
    display: inline-block;
    margin: var(--spacing-xs) 0;
}

.footer-link:hover {
    text-decoration: underline;
}

.copyright {
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-links {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .robot-content {
        grid-template-columns: 1fr;
    }
    
    .build-stage {
        flex-direction: column;
    }
    
    .stage-number {
        min-width: auto;
    }
    
    .gallery {
        grid-template-columns: 1fr;
    }
}