/* ============================================
   CSS VARIABLES - Theme Management System
   Why: Centralized design tokens for easy customization
   ============================================ */
:root {
    /* Color Palette - High contrast dark theme */
    --color-bg-primary: #0a0e27;
    --color-bg-secondary: #131829;
    --color-bg-tertiary: #1a1f3a;
    --color-accent-primary: #00d9ff;
    --color-accent-secondary: #7c3aed;
    --color-accent-gradient: linear-gradient(135deg, #00d9ff 0%, #7c3aed 100%);
    --color-text-primary: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    
    /* Typography */
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing System */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Layout */
    --container-max: 1200px;
    --border-radius: 8px;
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

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

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

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 217, 255, 0.1);
}

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

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
}

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

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

.nav-menu {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-speed);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-gradient);
    transition: width var(--transition-speed);
}

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

.nav-link-cta {
    padding: 0.5rem 1rem;
    background: var(--color-accent-gradient);
    border-radius: var(--border-radius);
    color: white;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-accent-primary);
    transition: all var(--transition-speed);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 217, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 217, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

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

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.5rem 1rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--color-accent-primary);
    margin-bottom: var(--space-lg);
    font-family: var(--font-mono);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
    font-family: var(--font-mono);
    line-height: 1.2;
}

.typewriter {
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

@keyframes blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.roi-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.roi-card {
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: var(--border-radius);
    transition: transform var(--transition-speed), border-color var(--transition-speed);
}

.roi-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
}

.roi-number {
    display: inline-block;
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-accent-primary);
}

.roi-suffix {
    display: inline-block;
    font-size: 2rem;
    color: var(--color-accent-secondary);
    margin-left: 0.2rem;
}

.roi-label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-speed);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent-primary);
    border: 2px solid var(--color-accent-primary);
}

.btn-secondary:hover {
    background: rgba(0, 217, 255, 0.1);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.scroll-arrow {
    width: 20px;
    height: 30px;
    border: 2px solid var(--color-accent-primary);
    border-radius: 15px;
    margin: 0.5rem auto;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-accent-primary);
    border-radius: 2px;
    animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
    0% { top: 5px; opacity: 1; }
    100% { top: 15px; opacity: 0; }
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-label {
    font-family: var(--font-mono);
    color: var(--color-accent-primary);
    font-size: 0.9rem;
    display: block;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: var(--space-md);
    font-weight: 700;
}

.section-description {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   PHILOSOPHY SECTION
   ============================================ */
.philosophy {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-secondary);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-3xl);
}

.pillar-card {
    padding: var(--space-xl);
    background: var(--color-bg-primary);
    border: 1px solid rgba(0, 217, 255, 0.1);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
}

.pillar-card:hover {
    transform: translateY(-10px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 20px 40px rgba(0, 217, 255, 0.1);
}

.pillar-card-highlight {
    border-color: var(--color-accent-primary);
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05), rgba(124, 58, 237, 0.05));
}

.pillar-icon {
    width: 50px;
    height: 50px;
    margin-bottom: var(--space-md);
    color: var(--color-accent-primary);
}

.pillar-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.pillar-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

.pillar-features {
    list-style: none;
}

.pillar-features li {
    padding: 0.5rem 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.pillar-features li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
}

.process-section {
    margin-top: var(--space-3xl);
    padding: var(--space-xl);
    background: var(--color-bg-primary);
    border-radius: var(--border-radius);
}

.process-title {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: var(--space-xl);
}

.process-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-md);
    align-items: center;
}

.process-step {
    text-align: center;
}

.process-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent-primary);
    margin-bottom: var(--space-sm);
}

.process-step h4 {
    font-size: 1.2rem;
    margin-bottom: var(--space-xs);
}

.process-step p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.process-connector {
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
    display: none;
}

/* ============================================
   VAULT (CASE STUDIES)
   ============================================ */
.vault {
    padding: var(--space-3xl) 0;
}

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

.vault-card {
    padding: var(--space-xl);
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 217, 255, 0.1);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
    cursor: pointer;
}

.vault-card:hover {
    transform: translateY(-10px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 20px 40px rgba(0, 217, 255, 0.2);
}

.vault-header {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.vault-tag {
    padding: 0.3rem 0.8rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
}

.vault-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.vault-excerpt {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.vault-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.metric {
    text-align: center;
    padding: var(--space-md);
    background: var(--color-bg-primary);
    border-radius: var(--border-radius);
}

.metric-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-accent-primary);
}

.metric-label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 0.3rem;
}

.vault-btn {
    width: 100%;
    padding: 0.8rem;
    background: transparent;
    border: 2px solid var(--color-accent-primary);
    color: var(--color-accent-primary);
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-family: var(--font-mono);
}

.vault-btn:hover {
    background: rgba(0, 217, 255, 0.1);
}

/* ============================================
   MODAL
   ============================================ */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: var(--border-radius);
    padding: var(--space-2xl);
    margin: var(--space-lg);
    z-index: 1;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-accent-primary);
    border-radius: 50%;
    color: var(--color-accent-primary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.modal-close:hover {
    background: var(--color-accent-primary);
    color: white;
    transform: rotate(90deg);
}

.modal-header h2 {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

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

.modal-section h3 {
    color: var(--color-accent-primary);
    font-size: 1.3rem;
    margin-bottom: var(--space-md);
    font-family: var(--font-mono);
}

.modal-section p, .modal-section ul {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.modal-section ul {
    list-style: none;
    padding-left: 0;
}

.modal-section li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.modal-section li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
}

.tech-stack-modal {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.tech-badge {
    padding: 0.5rem 1rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.impact-item {
    padding: var(--space-md);
    background: var(--color-bg-primary);
    border-radius: var(--border-radius);
    text-align: center;
}

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

.impact-label {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: 0.5rem;
}

/* ============================================
   TECH STACK
   ============================================ */
.stack {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-secondary);
}

.stack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.stack-category {
    padding: var(--space-xl);
    background: var(--color-bg-primary);
    border: 1px solid rgba(0, 217, 255, 0.1);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
}

.stack-category:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-5px);
}

.stack-category-title {
    font-size: 1.3rem;
    margin-bottom: var(--space-md);
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
}

.stack-list {
    list-style: none;
}

.stack-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(0, 217, 255, 0.1);
}

.stack-item:last-child {
    border-bottom: none;
}

.stack-name {
    color: var(--color-text-primary);
    font-weight: 500;
}

.stack-level {
    font-size: 0.75rem;
    padding: 0.3rem 0.8rem;
    background: rgba(0, 217, 255, 0.1);
    border-radius: 4px;
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    padding: var(--space-3xl) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-2xl);
    align-items: center;
}

.contact-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

.contact-benefits {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--color-text-secondary);
}

.benefit-item svg {
    width: 24px;
    height: 24px;
    color: var(--color-success);
    flex-shrink: 0;
}

.terminal {
    background: var(--color-bg-primary);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.terminal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-tertiary);
    border-bottom: 1px solid rgba(0, 217, 255, 0.2);
}

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

.terminal-controls {
    display: flex;
    gap: 0.5rem;
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-text-muted);
}

.terminal-form {
    padding: var(--space-lg);
}

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

.terminal-line-full {
    align-items: flex-start;
}

.terminal-prompt {
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
    font-weight: 700;
}

.terminal-line input,
.terminal-line textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    outline: none;
}

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

.terminal-line textarea {
    resize: vertical;
    min-height: 80px;
}

.terminal-submit {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-accent-gradient);
    border: none;
    border-radius: var(--border-radius);
    color: white;
    font-family: var(--font-mono);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.terminal-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.3);
}

.terminal-output {
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: rgba(0, 217, 255, 0.05);
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-success);
    display: none;
}

.terminal-output.show {
    display: block;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid rgba(0, 217, 255, 0.1);
}

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

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
}

.footer-tagline {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

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

.footer-right p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.footer-note {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

/* ============================================
   RESPONSIVE DESIGN
   Why: Mobile-first approach for accessibility
   ============================================ */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .roi-stats {
        grid-template-columns: 1fr;
    }
    
    .pillars-grid,
    .vault-grid,
    .stack-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .process-timeline {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-right {
        text-align: center;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.fade-in {
    animation: fadeIn 0.6s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Smooth scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-secondary);
}