/* ==================== MODERN CODEHUB STYLES ==================== */

/* CSS Variables for consistent theming */
:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #8b5cf6;
    --secondary-color: #f59e0b;
    --accent-color: #06b6d4;
    
    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ==================== RESET & BASE STYLES ==================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

/* ==================== UTILITY CLASSES ==================== */

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

.hidden {
    display: none !important;
}

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

/* ==================== NAVIGATION ==================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition-normal);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--gray-900);
    font-weight: 700;
    font-size: 1.25rem;
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.auth-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.auth-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--gray-200);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
}

.user-name {
    font-weight: 500;
    color: var(--gray-700);
}

.logout-btn {
    padding: var(--space-sm);
    background: none;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.logout-btn:hover {
    background: var(--gray-100);
    color: var(--error);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 1px;
    transition: var(--transition-fast);
}

/* ==================== HERO SECTION ==================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: grid-move 20s linear infinite;
}

.hero-particles {
    position: absolute;
    inset: 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="1" fill="rgba(255,255,255,0.3)"/><circle cx="80" cy="40" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="40" cy="80" r="1" fill="rgba(255,255,255,0.4)"/><circle cx="70" cy="70" r="0.5" fill="rgba(255,255,255,0.3)"/></svg>');
    background-size: 200px 200px;
    animation: particles-float 15s ease-in-out infinite;
}

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

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

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-text {
    color: white;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-3xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-xl);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
}

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

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

.btn-secondary {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.hero-stats {
    display: flex;
    gap: var(--space-2xl);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ==================== CODE EDITOR VISUAL ==================== */

.hero-visual {
    position: relative;
}

.code-editor {
    background: var(--gray-900);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: var(--transition-slow);
}

.code-editor:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.editor-header {
    background: var(--gray-800);
    padding: var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.editor-controls {
    display: flex;
    gap: var(--space-sm);
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.control.close { background: #ff5f56; }
.control.minimize { background: #ffbd2e; }
.control.maximize { background: #27ca3f; }

.editor-title {
    color: var(--gray-400);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.editor-content {
    display: flex;
    padding: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.line-numbers {
    color: var(--gray-500);
    margin-right: var(--space-lg);
    text-align: right;
    user-select: none;
}

.line-numbers span {
    display: block;
}

.code-content {
    flex: 1;
    color: var(--gray-300);
}

.code-line {
    margin-bottom: 2px;
}

.comment { color: #6a9955; }
.keyword { color: #569cd6; }
.variable { color: #9cdcfe; }
.operator { color: #d4d4d4; }
.string { color: #ce9178; }
.method { color: #dcdcaa; }
.bracket { color: #ffd700; }
.punctuation { color: #d4d4d4; }

.cursor {
    color: white;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* ==================== SEARCH SECTION ==================== */

.search-section {
    padding: var(--space-3xl) 0;
    background: var(--gray-50);
}

.search-container {
    max-width: 800px;
    margin: 0 auto;
}

.search-box {
    position: relative;
    margin-bottom: var(--space-2xl);
}

.search-input {
    width: 100%;
    padding: var(--space-lg) var(--space-lg) var(--space-lg) 3.5rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    font-size: 1.125rem;
    background: white;
    transition: var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-icon {
    position: absolute;
    left: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 1.25rem;
}

.filter-tabs {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.filter-tab {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    color: var(--gray-600);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* ==================== SECTION STYLES ==================== */

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--space-md);
    color: var(--gray-900);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== LANGUAGES SECTION ==================== */

.languages-section {
    padding: var(--space-3xl) 0;
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.language-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.language-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
}

.language-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.language-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.language-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.language-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
    color: var(--gray-900);
}

.difficulty-badge {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.difficulty-beginner {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.difficulty-intermediate {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.difficulty-advanced {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.language-description {
    color: var(--gray-600);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.language-tags {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.language-tag {
    padding: var(--space-xs) var(--space-md);
    background: var(--gray-100);
    color: var(--gray-700);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
}

.language-features {
    list-style: none;
    margin-bottom: var(--space-lg);
}

.language-features li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    color: var(--gray-600);
}

.language-features li::before {
    content: '✓';
    color: var(--success);
    font-weight: bold;
}

.language-actions {
    display: flex;
    gap: var(--space-md);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-fast);
}

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

/* ==================== COMPARISON SECTION ==================== */

.comparison-section {
    padding: var(--space-3xl) 0;
    background: var(--gray-50);
}

.comparison-container {
    max-width: 1000px;
    margin: 0 auto;
}

.comparison-selectors {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-xl);
    align-items: end;
    margin-bottom: var(--space-2xl);
}

.selector-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.selector-label {
    font-weight: 600;
    color: var(--gray-700);
}

.custom-select {
    position: relative;
}

.custom-select select {
    width: 100%;
    padding: var(--space-lg);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: white;
    font-size: 1rem;
    appearance: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.custom-select select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.select-arrow {
    position: absolute;
    right: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    pointer-events: none;
}

.vs-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.25rem;
}

.comparison-result {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    display: none;
}

.comparison-result.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

.comparison-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.comparison-header h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-xl);
}

.comparison-table th,
.comparison-table td {
    padding: var(--space-lg);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.comparison-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-900);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--space-xs);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-md);
    transition: width 0.5s ease;
}

/* ==================== RESOURCES SECTION ==================== */

.resources-section {
    padding: var(--space-3xl) 0;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
}

.resource-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: var(--transition-normal);
    text-align: center;
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.resource-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    margin: 0 auto var(--space-lg);
}

.resource-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--gray-900);
}

.resource-description {
    color: var(--gray-600);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

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

.resource-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

.resource-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(4px);
}

/* ==================== ABOUT SECTION ==================== */

.about-section {
    padding: var(--space-3xl) 0;
    background: var(--gray-900);
    color: white;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.about-description {
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--space-lg);
    opacity: 0.9;
}

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

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

.feature i {
    color: var(--primary-light);
    font-size: 1.25rem;
}

.stats-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    backdrop-filter: blur(10px);
}

.stat-item {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-light);
    margin-bottom: var(--space-xs);
}

.stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

/* ==================== FOOTER ==================== */

.footer {
    background: var(--gray-900);
    color: white;
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.25rem;
}

.footer-links {
    display: flex;
    gap: var(--space-xl);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition-fast);
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-bottom i {
    color: var(--error);
}

/* ==================== AUTHENTICATION MODAL ==================== */

.auth-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.auth-modal.show {
    display: flex;
}

.auth-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
}

.auth-modal-content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 400px;
}

.auth-container {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-xl);
    position: relative;
}

.auth-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.auth-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.auth-close {
    width: 32px;
    height: 32px;
    background: var(--gray-100);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition-fast);
}

.auth-close:hover {
    background: var(--gray-200);
    color: var(--gray-700);
}

.auth-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--gray-900);
}

.auth-subtitle {
    color: var(--gray-600);
    margin-bottom: var(--space-xl);
}

.auth-message {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    font-weight: 500;
    text-align: center;
    display: none;
}

.auth-message.show {
    display: block;
}

.auth-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.auth-message.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.input-group {
    margin-bottom: var(--space-lg);
}

.input-wrapper {
    position: relative;
}

.auth-input {
    width: 100%;
    padding: var(--space-lg) var(--space-lg) var(--space-lg) 3rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: white;
    transition: var(--transition-fast);
}

.auth-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.auth-input:focus + .input-label,
.auth-input:not(:placeholder-shown) + .input-label {
    transform: translateY(-28px) scale(0.875);
    color: var(--primary-color);
}

.input-label {
    position: absolute;
    left: 3rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-500);
    font-weight: 500;
    pointer-events: none;
    transition: var(--transition-fast);
    background: white;
    padding: 0 var(--space-xs);
}

.input-icon {
    position: absolute;
    left: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
}

.auth-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-700);
}

.checkbox-wrapper input {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--gray-300);
    border-radius: var(--space-xs);
    position: relative;
    transition: var(--transition-fast);
}

.checkbox-wrapper input:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-wrapper input:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.forgot-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

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

.auth-submit {
    width: 100%;
    padding: var(--space-lg);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.auth-submit:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.auth-submit:disabled {
    background: var(--gray-300);
    cursor: not-allowed;
    transform: none;
}

.auth-toggle {
    text-align: center;
    color: var(--gray-600);
}

.auth-toggle a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
}

.auth-toggle a:hover {
    color: var(--primary-dark);
}

/* ==================== ANIMATIONS ==================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ==================== RESPONSIVE DESIGN ==================== */

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .comparison-selectors {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .vs-divider {
        order: -1;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        transition: var(--transition-normal);
        gap: var(--space-md);
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .filter-tabs {
        flex-direction: column;
    }
    
    .languages-grid {
        grid-template-columns: 1fr;
    }
    
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .auth-modal-content {
        margin: var(--space-md);
    }
    
    .auth-container {
        padding: var(--space-lg);
    }
    
    .code-editor {
        transform: none;
    }
    
    .editor-content {
        font-size: 0.75rem;
        padding: var(--space-md);
    }
}

/* ==================== SCROLL ANIMATIONS ==================== */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== CUSTOM SCROLLBAR ==================== */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ==================== PRINT STYLES ==================== */

@media print {
    .navbar,
    .auth-modal,
    .hero-background {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        padding: var(--space-lg) 0;
    }
    
    * {
        box-shadow: none !important;
    }
}
/* ==================== LANGUAGE MODAL ==================== */

.language-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.language-modal.show {
    display: flex;
}

.language-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
}

.language-modal-content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    background: white;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl);
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.modal-header h2 {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 0;
}

.modal-header i {
    color: var(--primary-color);
}

.modal-close {
    width: 40px;
    height: 40px;
    background: var(--gray-200);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-300);
    color: var(--gray-800);
}

.modal-body {
    padding: var(--space-xl);
    overflow-y: auto;
    max-height: calc(90vh - 120px);
}

.modal-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-2xl);
}

.modal-section {
    margin-bottom: var(--space-xl);
}

.modal-section:last-child {
    margin-bottom: 0;
}

.modal-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--gray-900);
}

.modal-section p {
    color: var(--gray-600);
    line-height: 1.6;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    color: var(--gray-600);
}

.feature-list li::before {
    content: '✓';
    color: var(--success);
    font-weight: bold;
}

.use-cases {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.use-case-tag {
    padding: var(--space-sm) var(--space-md);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
}

.code-example {
    background: var(--gray-900);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.code-example pre {
    margin: 0;
    padding: var(--space-lg);
    color: var(--gray-300);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    overflow-x: auto;
}

.modal-sidebar h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--gray-900);
}

.stat-item {
    margin-bottom: var(--space-lg);
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-sm);
}

.stat-value {
    font-weight: 600;
    color: var(--gray-900);
    margin-top: var(--space-sm);
    text-align: right;
}

@media (max-width: 768px) {
    .modal-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .language-modal-content {
        margin: var(--space-md);
        max-height: calc(100vh - 2rem);
    }
    
    .modal-body {
        padding: var(--space-lg);
        max-height: calc(100vh - 140px);
    }
}
/* ==================== COMPARISON USE CASES ==================== */

.comparison-use-cases {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    margin-top: var(--space-2xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--gray-200);
}

.use-case-section h4 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--gray-900);
}

.use-case-section i {
    color: var(--primary-color);
}

.use-case-list {
    list-style: none;
    padding: 0;
}

.use-case-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    color: var(--gray-600);
}

.use-case-list i {
    color: var(--success);
    font-size: 0.875rem;
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

@media (max-width: 768px) {
    .comparison-use-cases {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}