/* Linux Distributions Learning Centre - Design System */
/* Brutalist/Industrial aesthetic with terminal-inspired elements */

:root {
    /* Color Palette - Brutalist Concrete */
    --bg-primary: #0D0D0D;
    --bg-secondary: #1A1A1A;
    --bg-tertiary: #262626;
    --bg-card: #1E1E1E;
    
    --text-primary: #F5F5F5;
    --text-secondary: #A3A3A3;
    --text-muted: #737373;
    
    --accent-primary: #FF6B2B;
    --accent-secondary: #FFB088;
    --accent-glow: rgba(255, 107, 43, 0.3);
    
    --border-color: #404040;
    --border-subtle: #2A2A2A;
    
    --success: #22C55E;
    --warning: #EAB308;
    --error: #EF4444;
    --info: #3B82F6;
    
    /* Ubuntu colors */
    --ubuntu-orange: #E95420;
    --ubuntu-purple: #772953;
    
    /* Debian colors */
    --debian-red: #D70751;
    
    /* Arch colors */
    --arch-blue: #1793D1;
    
    /* Fedora colors */
    --fedora-blue: #294172;
    
    /* openSUSE colors */
    --opensuse-green: #73BA25;
    
    /* Mint colors */
    --mint-green: #87CF3E;
    
    /* Typography */
    --font-display: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', 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;
    --space-4xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-display);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Selection */
::selection {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 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-primary);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-primary);
}

code {
    font-family: var(--font-mono);
    background-color: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-size: 0.875em;
    color: var(--accent-secondary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background-color: rgba(13, 13, 13, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-subtle);
}

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

.logo-icon {
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 1.1em;
}

.logo-text {
    color: var(--text-primary);
}

.logo-accent {
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    background-color: var(--accent-primary);
    color: var(--bg-primary) !important;
    padding: var(--space-sm) var(--space-md);
    border-radius: 4px;
    font-weight: 600;
}

.nav-cta:hover {
    background-color: var(--accent-secondary);
}

.nav-cta::after {
    display: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-base);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: calc(var(--space-4xl) + 60px) var(--space-xl) var(--space-4xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(255, 107, 43, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 176, 136, 0.05) 0%, transparent 40%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-eyebrow {
    display: inline-block;
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    line-height: 1.1;
}

.title-highlight {
    display: block;
    color: var(--accent-primary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: var(--space-xl);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 4px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}

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

.btn-small {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
}

.hero-stats {
    display: flex;
    gap: var(--space-3xl);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Terminal Window */
.hero-visual {
    position: relative;
    z-index: 1;
}

.terminal-window {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.terminal-header {
    background-color: var(--bg-tertiary);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

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

.dot-red { background-color: #FF5F56; }
.dot-yellow { background-color: #FFBD2E; }
.dot-green { background-color: #27C93F; }

.terminal-title {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-muted);
    flex: 1;
    text-align: center;
}

.terminal-body {
    padding: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.terminal-line {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.prompt {
    color: var(--accent-primary);
    font-weight: 600;
}

.command {
    color: var(--text-primary);
}

.command-output {
    color: var(--text-secondary);
}

.typing {
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.cursor {
    animation: blink 1s step-end infinite;
    color: var(--accent-primary);
}

.terminal-output {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

.ascii-art {
    color: var(--accent-secondary);
    font-size: 0.75rem;
    line-height: 1.4;
    white-space: pre;
}

.dir {
    color: var(--accent-primary);
    margin-right: var(--space-md);
}

/* Hero Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent-primary), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* Section Styles */
section {
    padding: var(--space-4xl) var(--space-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-3xl);
}

.section-eyebrow {
    display: inline-block;
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

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

.section-description {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Distributions Section */
.distributions {
    background-color: var(--bg-secondary);
    position: relative;
}

.distributions::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.distro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.distro-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: var(--space-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.distro-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

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

.distro-card:hover::before {
    transform: scaleX(1);
}

.distro-card.featured {
    grid-column: span 2;
}

.distro-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
}

.distro-icon {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: white;
}

.ubuntu-icon { background: linear-gradient(135deg, var(--ubuntu-orange), var(--ubuntu-purple)); }
.debian-icon { background: linear-gradient(135deg, var(--debian-red), #A80030); }
.arch-icon { background: linear-gradient(135deg, var(--arch-blue), #0D4A6A); }
.fedora-icon { background: linear-gradient(135deg, var(--fedora-blue), #3C6EB4); }
.opensuse-icon { background: linear-gradient(135deg, var(--opensuse-green), #35B9AB); }
.mint-icon { background: linear-gradient(135deg, var(--mint-green), #5A9E3D); }

.distro-badge {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.distro-badge-alt {
    background-color: var(--arch-blue);
    color: white;
}

.distro-name {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
}

.distro-tagline {
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.distro-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.distro-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.meta-item {
    color: var(--text-muted);
    font-size: 0.8125rem;
    font-family: var(--font-mono);
}

.distro-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.difficulty {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
}

.difficulty.easy {
    background-color: rgba(34, 197, 94, 0.2);
    color: var(--success);
}

.difficulty.medium {
    background-color: rgba(234, 179, 8, 0.2);
    color: var(--warning);
}

.difficulty.hard {
    background-color: rgba(239, 68, 68, 0.2);
    color: var(--error);
}

/* Compare Section */
.compare {
    background-color: var(--bg-primary);
}

.compare-table-container {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border-subtle);
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

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

.compare-table th {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.compare-table tr:hover {
    background-color: var(--bg-secondary);
}

.distro-cell {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-weight: 600;
}

.table-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    color: white;
}

.difficulty-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* Interactive Terminal Section */
.interactive-terminal {
    background-color: var(--bg-secondary);
    position: relative;
}

.interactive-terminal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.terminal-demo {
    max-width: 900px;
    margin: 0 auto;
}

.terminal-large {
    min-height: 400px;
}

.terminal-large .terminal-body {
    min-height: 350px;
    display: flex;
    flex-direction: column;
}

.terminal-history {
    flex: 1;
    overflow-y: auto;
}

.terminal-input-line {
    display: flex;
    gap: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-subtle);
    margin-top: auto;
}

.terminal-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    outline: none;
}

.terminal-input::placeholder {
    color: var(--text-muted);
}

.command-suggestions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    flex-wrap: wrap;
}

.suggestion-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.command-chip {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: var(--space-sm) var(--space-md);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.command-chip:hover {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    border-color: var(--accent-primary);
}

/* Resources Section */
.resources {
    background-color: var(--bg-primary);
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-xl);
}

.resource-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: var(--space-xl);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.resource-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.resource-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.resource-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-lg);
    flex: 1;
}

.resource-link {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.resource-card:hover .resource-link {
    color: var(--accent-secondary);
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-4xl) var(--space-xl) var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--space-4xl);
    max-width: 1400px;
    margin: 0 auto var(--space-3xl);
}

.footer-brand {
    max-width: 300px;
}

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

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-xl);
}

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

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-family: 'Font Awesome 6 Brands', sans-serif;
    font-size: 1.125rem;
    transition: all var(--transition-fast);
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.footer-column h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--space-sm);
}

.footer-column a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-subtle);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-license {
    margin-top: var(--space-sm);
    font-size: 0.8125rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--space-3xl);
    }
    
    .hero-visual {
        order: -1;
    }
    
    .distro-card.featured {
        grid-column: span 1;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-3xl);
    }
    
    .footer-brand {
        max-width: 100%;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .distro-grid {
        grid-template-columns: 1fr;
    }
    
    .compare-table-container {
        font-size: 0.875rem;
    }
    
    .compare-table th,
    .compare-table td {
        padding: var(--space-sm) var(--space-md);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .command-suggestions {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    :root {
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
        --space-3xl: 2.5rem;
        --space-4xl: 3rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* Terminal output styling */
.terminal-response {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    padding-left: var(--space-lg);
}

.terminal-error {
    color: var(--error);
}

.terminal-success {
    color: var(--success);
}

.terminal-info {
    color: var(--info);
}