/* ==========================================================================
   CSS Variables & Reset
   ========================================================================== */

:root {
    /* Colors */
    --bg-base: #121212;
    --bg-surface: #1a1a1a;
    --bg-surface-hover: #222222;
    --bg-surface-border: #2a2a2a;
    
    --accent-lime: #B6FF00;
    --accent-lime-hover: #9ad600;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    
    --rarity-rare: #00BFFF;
    --rarity-epic: #9D00FF;
    --rarity-legendary: #FFB800;

    /* Typography */
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;
    
    /* Spacing & Layout */
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Radii */
    --radius-sm: 4px;
    --radius-md: 8px;
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 2px solid var(--accent-lime);
    outline-offset: 4px;
}

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

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
}

h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn-primary, .btn-secondary, .btn-primary-small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-lime);
    color: #000000;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
}

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

.btn-primary-small {
    background-color: var(--accent-lime);
    color: #000000;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--bg-surface-border);
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
}

.btn-secondary:hover {
    background-color: var(--bg-surface);
    border-color: var(--text-muted);
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(18, 18, 18, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--bg-surface-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.nav-logo a {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.1em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a:not(.btn-primary-small) {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.nav-links a:not(.btn-primary-small):hover {
    color: var(--text-primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 101;
}

.hamburger, .hamburger::before, .hamburger::after {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
}

.hamburger::before {
    transform: translateY(-8px);
}

.hamburger::after {
    transform: translateY(8px);
}

.nav-toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    padding: var(--spacing-xl) var(--spacing-md);
    border-bottom: 1px solid var(--bg-surface-border);
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-content {
    max-width: 540px;
}

.subtitle {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* ==========================================================================
   Stat Card (Hero Visual)
   ========================================================================== */

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.stat-card {
    font-family: var(--font-mono);
    background-color: var(--bg-base);
    color: var(--text-primary);
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-card-border {
    color: var(--text-muted);
    user-select: none;
    letter-spacing: -2px;
    overflow: hidden;
    white-space: nowrap;
}

.stat-card-header {
    text-align: center;
}

.stat-card-header h2 {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    letter-spacing: 0.1em;
}

.stat-card-header .tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.car-image-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 150px;
}

.car-image {
    max-width: 100%;
    height: auto;
    max-height: 100%;
    filter: drop-shadow(0 4px 20px rgba(0,0,0,0.5));
    object-fit: contain;
}

.stat-details {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-height: 120px;
}

.stat-row {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    font-size: 0.875rem;
}

.stat-row.title-row {
    justify-content: center;
    margin-bottom: 0.5rem;
    gap: 0.5rem;
}

.bracket {
    color: var(--text-muted);
}

.car-name {
    color: var(--accent-lime);
    font-weight: 700;
}

.stat-label {
    color: var(--text-secondary);
    width: 80px;
}

.stat-value {
    color: var(--text-primary);
    font-weight: 500;
}

.rarity-rare {
    color: var(--rarity-rare);
}
.rarity-epic {
    color: var(--rarity-epic);
}
.rarity-legendary {
    color: var(--rarity-legendary);
}

/* Animations */
.fade-transition {
    transition: opacity 0.3s ease;
    opacity: 1;
}

.fade-out {
    opacity: 0;
}

/* ==========================================================================
   Features Section
   ========================================================================== */

.features {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--bg-surface-border);
}

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    max-width: 600px;
    margin-bottom: var(--spacing-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background-color: var(--bg-base);
    border: 1px solid var(--bg-surface-border);
    padding: 2rem;
    border-radius: var(--radius-sm);
    transition: border-color 0.2s ease;
}

.feature-card:hover {
    border-color: var(--text-muted);
}

.feature-card h3 {
    margin-bottom: 1rem;
}

.feature-card p {
    margin-bottom: 0;
    font-size: 0.9375rem;
}

/* ==========================================================================
   About / Generic Page Section
   ========================================================================== */

.about, .generic-page {
    padding: var(--spacing-xl) var(--spacing-md);
}

.about-content, .page-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content h2, .page-content h1 {
    margin-bottom: var(--spacing-md);
}

.about-content p, .page-content p {
    font-size: 1.125rem;
}

.page-content h2 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.page-content ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
    color: var(--text-secondary);
}

.page-content li {
    margin-bottom: 0.5rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    padding: var(--spacing-lg) var(--spacing-md);
    border-top: 1px solid var(--bg-surface-border);
    background-color: var(--bg-base);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.footer-logo {
    font-family: var(--font-mono);
    font-weight: 700;
    letter-spacing: 0.1em;
}

.copyright {
    font-size: 0.875rem;
    margin-bottom: 0;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 900px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .stat-row {
        justify-content: center;
    }

    .stat-label {
        width: auto;
        margin-right: 0.5rem;
    }
}

@media (max-width: 600px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-surface);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--bg-surface-border);
        
        /* Animation states */
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    }
    
    .nav-links.nav-active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}