/* Gnopping - Mathematical Games CSS */

:root {
    /* Fun Gaming Color Palette */
    --primary: #ff6b6b;
    --secondary: #4ecdc4;
    --accent: #ffe66d;
    --tertiary: #a8e6cf;
    --quaternary: #ffd3a5;
    --dark: #2d3436;
    --light: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #e9ecef;
    --gray-200: #dee2e6;
    --gray-300: #ced4da;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;

    /* Gaming Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Typography */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 4rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-glow: 0 0 20px rgba(255, 107, 107, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.gnop-logo {
    position: relative;
    width: 40px;
    height: 40px;
}

.gnop-body {
    width: 32px;
    height: 28px;
    background: var(--primary);
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
    position: relative;
    margin: 0 auto;
}

.gnop-eye {
    position: absolute;
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
    top: 8px;
}

.left-eye {
    left: 8px;
}

.right-eye {
    right: 8px;
}

.gnop-mouth {
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 4px;
    background: white;
    border-radius: 0 0 4px 4px;
}

.gnop-antenna {
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 8px;
    background: var(--primary);
    border-radius: 1px 1px 0 0;
}

.brand-text {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    gap: var(--space-6);
}

.nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -25px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    gap: var(--space-3);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--space-3);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #ff5252);
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover .btn-glow {
    left: 100%;
}

/* Hero Section */
.hero {
    padding: var(--space-24) 0 var(--space-16) 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::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 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="80" r="1.5" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.1;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--space-6);
    margin-bottom: var(--space-4);
    backdrop-filter: blur(10px);
}

.badge-text {
    font-size: var(--text-sm);
    font-weight: 600;
    color: white;
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: 800;
    margin-bottom: var(--space-4);
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--quaternary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-lg);
    margin-bottom: var(--space-6);
    opacity: 0.9;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: var(--text-3xl);
    font-weight: 800;
    color: var(--accent);
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--text-sm);
    opacity: 0.8;
}

.hero-visual {
    position: relative;
}

.game-showcase {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

.floating-game {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--space-4);
    padding: var(--space-4);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.floating-game:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.2);
}

.game-icon {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-2);
    display: block;
}

.game-title {
    font-size: var(--text-sm);
    font-weight: 600;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--space-3);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* Games Section */
.games {
    padding: var(--space-20) 0;
    background: white;
}

.games-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--gray-100);
    border-radius: var(--space-3);
    padding: var(--space-2);
    min-width: 300px;
}

.search-box input {
    border: none;
    background: transparent;
    padding: var(--space-2);
    flex: 1;
    font-size: var(--text-sm);
}

.search-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--space-2);
    cursor: pointer;
}

.filter-buttons {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.filter-btn {
    background: white;
    border: 2px solid var(--gray-300);
    color: var(--gray-700);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--space-6);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-10);
}

.game-card {
    background: white;
    border-radius: var(--space-4);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

.game-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.game-card.not-implemented {
    opacity: 0.6;
    filter: grayscale(50%);
    cursor: not-allowed;
}

.game-card.not-implemented:hover {
    transform: none;
    box-shadow: var(--shadow);
    border-color: transparent;
}

.game-image {
    height: 160px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-4xl);
    color: white;
}

.game-info {
    padding: var(--space-4);
}

.game-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--space-2);
}

.game-description {
    color: var(--gray-600);
    font-size: var(--text-sm);
    margin-bottom: var(--space-3);
    line-height: 1.5;
}

.game-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--text-xs);
    color: var(--gray-500);
}

.game-category {
    background: var(--gray-100);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--space-2);
    font-weight: 500;
}

.game-rating {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

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

/* Categories Section */
.categories {
    padding: var(--space-20) 0;
    background: var(--gray-50);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

.category-card {
    background: white;
    border-radius: var(--space-4);
    padding: var(--space-6);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.category-icon {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-3);
}

.category-card h3 {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--space-3);
}

.category-card p {
    color: var(--gray-600);
    margin-bottom: var(--space-4);
    line-height: 1.5;
}

.category-count {
    background: var(--primary);
    color: white;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--space-4);
    font-size: var(--text-sm);
    font-weight: 600;
    display: inline-block;
}

/* Leaderboard Section */
.leaderboard {
    padding: var(--space-20) 0;
    background: white;
}

.leaderboard-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
}

.tab-btn {
    background: white;
    border: 2px solid var(--gray-300);
    color: var(--gray-700);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--space-3);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.leaderboard-list {
    max-width: 600px;
    margin: 0 auto;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    background: var(--gray-50);
    border-radius: var(--space-3);
    margin-bottom: var(--space-2);
}

.leaderboard-item.top-3 {
    background: linear-gradient(135deg, var(--accent), var(--quaternary));
    color: var(--dark);
}

.leaderboard-rank {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--primary);
    min-width: 30px;
}

.leaderboard-player {
    flex: 1;
    font-weight: 500;
}

.leaderboard-score {
    font-weight: 600;
    color: var(--secondary);
}

/* About Section */
.about {
    padding: var(--space-20) 0;
    background: var(--gray-50);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
}

.about-text {
    font-size: var(--text-lg);
    line-height: 1.7;
}

.about-text p {
    margin-bottom: var(--space-4);
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    margin-top: var(--space-6);
}

.feature {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 500;
}

.feature-icon {
    font-size: var(--text-lg);
}

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

.math-symbols {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.symbol {
    font-size: var(--text-4xl);
    color: var(--primary);
    animation: float 3s ease-in-out infinite;
}

.symbol:nth-child(2) { animation-delay: 0.5s; }
.symbol:nth-child(3) { animation-delay: 1s; }
.symbol:nth-child(4) { animation-delay: 1.5s; }
.symbol:nth-child(5) { animation-delay: 2s; }
.symbol:nth-child(6) { animation-delay: 2.5s; }
.symbol:nth-child(7) { animation-delay: 3s; }
.symbol:nth-child(8) { animation-delay: 3.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* Footer */
.footer {
    background: var(--dark);
    color: white;
    padding: var(--space-12) 0 var(--space-6) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer-links a {
    color: var(--gray-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-social {
    display: flex;
    gap: var(--space-4);
}

.social-link {
    color: var(--gray-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.social-link:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-700);
    color: var(--gray-400);
    font-size: var(--text-sm);
}

/* Game Modal */
.game-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--space-4);
}

.game-modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--space-4);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-5);
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--dark);
}

.close-btn {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    cursor: pointer;
    color: var(--gray-500);
    padding: var(--space-1);
    border-radius: var(--space-2);
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--gray-100);
    color: var(--dark);
}

.modal-body {
    padding: var(--space-5);
    max-height: 70vh;
    overflow-y: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: var(--space-4) 0;
    }

    .nav-menu {
        margin: var(--space-4) 0;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }

    .hero-title {
        font-size: var(--text-4xl);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .games-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        min-width: auto;
    }

    .filter-buttons {
        justify-content: center;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-6);
    }

    .math-symbols {
        grid-template-columns: repeat(2, 1fr);
    }
}