/* ========================================
   CSS VARIABLES - DESIGN SYSTEM
   ======================================== */
:root {
    /* Color Palette - Dark Mode Primary */
    --bg-primary: #0b0f14;
    --bg-secondary: #0f172a;
    --bg-tertiary: #1e293b;
    --bg-card: #1a1f2e;
    --bg-hover: #252d3d;
    
    /* Accent Colors */
    --accent-cyan: #06b6d4;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-violet: #8b5cf6;
    --accent-yellow: #eab308;
    --accent-red: #ef4444;
    
    /* Text Colors */
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-muted: #64748b;
    
    /* Border & Dividers */
    --border-primary: #334155;
    --border-secondary: #1e293b;
    --border-glow: rgba(6, 182, 212, 0.3);
    
    /* Typography */
    --font-mono: 'JetBrains Mono', 'Space Mono', 'Courier New', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Effects */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.2);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

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

body.dark-mode {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

/* ========================================
   NAVIGATION SYSTEM
   ======================================== */
.system-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(11, 15, 20, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-primary);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1.1rem;
}

.brand-bracket {
    color: var(--accent-cyan);
    font-weight: 700;
}

.brand-name {
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.system-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-left: var(--spacing-sm);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: all var(--transition-normal);
    position: relative;
}

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

.nav-links a::before {
    content: attr(data-section);
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--accent-cyan);
    opacity: 0;
    transition: opacity var(--transition-fast);
    white-space: nowrap;
}

.nav-links a:hover::before {
    opacity: 1;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* ========================================
   SYSTEM BOOT / HERO SECTION
   ======================================== */
.system-boot {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    background: 
        radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
        var(--bg-primary);
}

.terminal-window {
    background: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
}

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

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

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

.control-dot.red { background: #ef4444; }
.control-dot.yellow { background: #eab308; }
.control-dot.green { background: #10b981; }

.terminal-title {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.terminal-body {
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.8;
}

.terminal-line {
    margin-bottom: var(--spacing-sm);
}

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

.command {
    color: var(--accent-cyan);
    margin-left: var(--spacing-xs);
}

.terminal-output {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.output-line {
    color: var(--text-primary);
    margin: 0.3rem 0;
}

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

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

.quick-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: all var(--transition-normal);
}

.action-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
    transform: translateY(-2px);
}

.action-btn i {
    color: var(--accent-cyan);
}

/* ========================================
   SECTION HEADERS
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.05em;
}

.title-bracket {
    color: var(--accent-cyan);
    font-weight: 700;
}

.section-path {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ========================================
   ENGINEERING PROFILE SECTION
   ======================================== */
.engineering-profile {
    background: var(--bg-secondary);
}

.profile-container {
    margin-bottom: var(--spacing-xl);
}

.profile-image-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.profile-pic {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 3px solid var(--accent-cyan);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.3);
    object-fit: cover;
    transition: all var(--transition-normal);
}

.profile-pic:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.5);
}

.profile-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.profile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: var(--spacing-lg);
}

.config-block {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.config-block:hover {
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.config-block.full-width {
    grid-column: 1 / -1;
}

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

.config-header i {
    color: var(--accent-cyan);
    font-size: 1.1rem;
}

.config-header span {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.config-content {
    padding: var(--spacing-md);
}

.config-line {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.key {
    color: var(--accent-violet);
    min-width: 180px;
}

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

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.metric-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: 6px;
    border: 1px solid var(--border-secondary);
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-cyan);
    font-family: var(--font-mono);
    margin-bottom: var(--spacing-xs);
}

.metric-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ========================================
   TECH STACK SECTION
   ======================================== */
.tech-stack {
    background: var(--bg-primary);
}

.stack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.stack-module {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.stack-module:hover {
    border-color: var(--accent-blue);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
    transform: translateY(-4px);
}

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

.module-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: 6px;
    font-size: 1.3rem;
    color: var(--accent-cyan);
}

.module-header h3 {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    flex: 1;
    color: var(--text-primary);
}

.module-status {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-green);
    background: rgba(16, 185, 129, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    font-family: var(--font-mono);
}

.module-body {
    padding: var(--spacing-md);
}

.tech-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-xs);
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.tech-name {
    font-size: 0.9rem;
    color: var(--text-primary);
    grid-column: 1;
}

.tech-version {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    grid-column: 2;
    text-align: right;
}

.tech-bar {
    grid-column: 1 / -1;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.25rem;
}

.tech-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
    border-radius: 2px;
    transition: width var(--transition-slow);
}

/* ========================================
   FEATURED SYSTEMS SECTION
   ======================================== */
.featured-systems {
    background: var(--bg-secondary);
}

.featured-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.featured-card:hover {
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
}

.featured-image {
    width: 100%;
    height: 300px;
    overflow: hidden;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-primary);
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.featured-card:hover .featured-image img {
    transform: scale(1.05);
}

.featured-header {
    background: var(--bg-tertiary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-primary);
}

.featured-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.featured-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-cyan);
    padding: 0.25rem 0.75rem;
    border-radius: 3px;
}

.featured-status {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
    padding: 0.25rem 0.75rem;
    border-radius: 3px;
}

.featured-header h3 {
    font-size: 1.8rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-weight: 700;
}

.featured-body {
    padding: var(--spacing-lg);
}

.featured-problem,
.featured-solution,
.featured-architecture,
.featured-challenges {
    margin-bottom: var(--spacing-lg);
}

.featured-body h4 {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.featured-problem h4 i { color: var(--accent-red); }
.featured-solution h4 i { color: var(--accent-green); }
.featured-architecture h4 i { color: var(--accent-blue); }
.featured-challenges h4 i { color: var(--accent-yellow); }

.featured-body p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.featured-body ul {
    list-style: none;
    padding-left: var(--spacing-md);
}

.featured-body li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    position: relative;
    padding-left: var(--spacing-md);
}

.featured-body li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
    font-weight: bold;
}

.arch-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    align-items: center;
}

.arch-layer {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 6px;
    border: 1px solid var(--border-primary);
    text-align: center;
}

.layer-title {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.layer-tech {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    line-height: 1.5;
}

.arch-arrow {
    text-align: center;
    color: var(--accent-cyan);
    font-size: 1.5rem;
    font-weight: bold;
}

.featured-tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.tech-badge {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    border: 1px solid var(--border-primary);
}

.featured-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.featured-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: all var(--transition-normal);
}

.featured-link:hover {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
    transform: translateY(-2px);
}

.featured-link i {
    color: var(--accent-cyan);
}

/* ========================================
   ALL SYSTEMS SECTION
   ======================================== */
.all-systems {
    background: var(--bg-primary);
}

.systems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.system-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.system-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.system-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.system-card:hover .system-image img {
    transform: scale(1.1);
}

.system-card > :not(.system-image) {
    padding: 0 var(--spacing-lg);
}

.system-card > .system-status-bar {
    padding: var(--spacing-md) var(--spacing-lg) 0;
}

.system-card > .system-links {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.system-status-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-indicator.running {
    background: var(--accent-green);
    animation: pulse 2s ease-in-out infinite;
}

.system-status-bar .status-text {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-green);
}

.system-name {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.system-desc {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
}

.system-arch {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: 6px;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-secondary);
}

.arch-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

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

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

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

.system-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.sys-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-cyan);
    padding: 0.25rem 0.6rem;
    border-radius: 3px;
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.system-links {
    display: flex;
    gap: var(--spacing-sm);
}

.sys-link {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    transition: all var(--transition-normal);
}

.sys-link:hover {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
}

.sys-link i {
    color: var(--accent-cyan);
}

/* ========================================
   ENGINEERING TIMELINE SECTION
   ======================================== */
.engineering-timeline {
    background: var(--bg-secondary);
}

.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding-left: 50px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-violet));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
}

.timeline-marker {
    position: absolute;
    left: -34px;
    top: 0;
    width: 12px;
    height: 12px;
    background: var(--accent-cyan);
    border: 3px solid var(--bg-secondary);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
    transform: translateX(10px);
}

.timeline-header h3 {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    font-size: 0.95rem;
    color: var(--accent-cyan);
    font-weight: 500;
}

.timeline-period {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: var(--spacing-sm) 0;
}

.timeline-desc p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.timeline-list {
    list-style: none;
    padding-left: 0;
}

.timeline-list li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-md);
    position: relative;
    line-height: 1.6;
}

.timeline-list li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
    font-weight: bold;
}

.timeline-list strong {
    color: var(--text-primary);
}

/* ========================================
   ENDPOINTS SECTION
   ======================================== */
.endpoints {
    background: var(--bg-primary);
}

.endpoints-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.endpoint-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
}

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

.endpoint-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 1.5rem;
    color: var(--accent-cyan);
    flex-shrink: 0;
}

.endpoint-info {
    flex: 1;
}

.endpoint-label {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent-green);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.endpoint-desc {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.endpoint-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.endpoint-link:hover {
    color: var(--accent-cyan);
}

.endpoint-link i {
    color: var(--accent-cyan);
    transition: transform var(--transition-fast);
}

.endpoint-link:hover i {
    transform: translateX(5px);
}

.endpoint-static {
    color: var(--text-secondary);
    cursor: default;
}

.endpoint-static:hover {
    color: var(--text-secondary);
}

/* ========================================
   FOOTER
   ======================================== */
.system-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--spacing-xl) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    align-items: center;
}

.footer-brand {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.footer-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.footer-status .status-dot {
    width: 6px;
    height: 6px;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    transition: color var(--transition-fast);
}

.footer-nav a:hover {
    color: var(--accent-cyan);
}

.footer-right {
    text-align: right;
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 0.25rem;
}

.footer-version {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ========================================
   SCROLL PROGRESS & BACK TO TOP
   ======================================== */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-violet));
    z-index: 9999;
    transition: width var(--transition-fast);
}

#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    color: var(--accent-cyan);
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
    transform: translateY(-5px);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
    .section-title {
        font-size: 2rem;
    }
    
    .profile-grid,
    .stack-grid,
    .systems-grid {
        grid-template-columns: 1fr;
    }
    
    .arch-grid {
        grid-template-columns: 1fr;
    }
    
    .arch-arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        width: 250px;
        padding: var(--spacing-lg);
        border-left: 2px solid var(--border-primary);
        box-shadow: var(--shadow-lg);
        transform: translateX(100%);
        transition: transform var(--transition-normal);
        display: flex;
        gap: var(--spacing-sm);
        z-index: 999;
    }
    
    .nav-links.mobile-active {
        transform: translateX(0);
    }
    
    .nav-links li {
        margin: 0;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .terminal-body {
        font-size: 0.85rem;
        padding: var(--spacing-md);
    }
    
    .quick-actions {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
        justify-content: center;
    }
    
    .profile-grid {
        grid-template-columns: 1fr;
    }
    
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .systems-grid {
        grid-template-columns: 1fr;
    }
    
    .endpoints-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-right {
        text-align: center;
    }
    
    .footer-nav {
        justify-content: center;
    }
    
    .timeline {
        padding-left: 30px;
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-marker {
        left: -24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section-title {
        font-size: 1.3rem;
    }
    
    .metric-value {
        font-size: 2rem;
    }
    
    .system-name {
        font-size: 1.1rem;
    }
    
    .featured-header h3 {
        font-size: 1.3rem;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.fade-in {
    opacity: 0;
    animation: fadeIn var(--transition-slow) forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

.slide-up {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp var(--transition-slow) forwards;
}

@keyframes slideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
/* ========================================
   VIDEO MODAL
   ======================================== */
.video-modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 1200px;
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.8), 
                0 0 50px rgba(6, 182, 212, 0.3);
    animation: slideUp 0.3s ease;
}

.video-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: var(--text-primary);
    font-size: 40px;
    font-weight: 300;
    cursor: pointer;
    z-index: 10001;
    transition: all var(--transition-base);
    line-height: 1;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-close:hover {
    color: var(--accent-red);
    transform: rotate(90deg);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    background: #000;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Mobile responsive for video modal */
@media (max-width: 768px) {
    .video-modal-content {
        width: 95%;
    }
    
    .video-close {
        top: -35px;
        font-size: 35px;
    }
}