/* ============================================
   Kloak Website Styles
   Modern, Premium Design System
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a24;
    --color-surface: #1e1e28;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    
    --color-text: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-muted: rgba(255, 255, 255, 0.5);
    
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    
    --color-accent: #22d3ee;
    --color-accent-secondary: #a855f7;
    
    --color-success: #22c55e;
    --color-warning: #eab308;
    --color-error: #ef4444;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #22d3ee 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    --gradient-hero: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.2) 0%, transparent 50%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

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

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

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-4) 0;
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.logo-icon {
    font-size: 1.5rem;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    list-style: none;
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-cta:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-border-hover);
}

.github-icon {
    opacity: 0.8;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

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

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-24) 0 var(--space-16);
    overflow: hidden;
}

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

.hero-gradient {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 150%;
    background: var(--gradient-hero);
    opacity: 0.8;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

.hero-container {
    flex: 1;
    max-width: 700px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary-light);
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.6s ease forwards;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: var(--radius-full);
    animation: pulse 2s infinite;
}

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

.hero-title {
    font-size: clamp(var(--font-size-4xl), 6vw, var(--font-size-6xl));
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.6s ease 0.1s forwards;
    opacity: 0;
}

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

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 560px;
    margin-bottom: var(--space-8);
    animation: fadeInUp 0.6s ease 0.2s forwards;
    opacity: 0;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
    animation: fadeInUp 0.6s ease 0.3s forwards;
    opacity: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

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

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    animation: fadeInUp 0.6s ease 0.4s forwards;
    opacity: 0;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

.hero-visual {
    position: absolute;
    right: -5%;
    top: 50%;
    transform: translateY(-50%);
    width: 45%;
    max-width: 550px;
    animation: fadeInRight 0.8s ease 0.5s forwards;
    opacity: 0;
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateY(-50%) translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateY(-50%) translateX(0);
    }
}

/* Terminal */
.terminal {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.terminal-header {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.terminal-buttons {
    display: flex;
    gap: var(--space-2);
}

.terminal-btn {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

.terminal-btn.red { background: #ff5f57; }
.terminal-btn.yellow { background: #ffbd2e; }
.terminal-btn.green { background: #28c840; }

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

.terminal-body {
    padding: var(--space-6);
}

.terminal-body pre {
    margin: 0;
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

.term-comment { color: var(--color-text-muted); }
.term-key { color: var(--color-accent); }
.term-hash { color: var(--color-accent-secondary); }
.term-value { color: var(--color-success); }
.term-success { color: var(--color-success); }

/* ============================================
   Sections Common
   ============================================ */

section {
    padding: var(--space-24) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-16);
}

.section-tag {
    display: inline-block;
    padding: var(--space-1) var(--space-4);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary-light);
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

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

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

.features {
    background: var(--color-bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.feature-card {
    padding: var(--space-8);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

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

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-primary-light);
    margin-bottom: var(--space-5);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.feature-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============================================
   How It Works Section
   ============================================ */

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: var(--space-8);
    padding: var(--space-8);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.step:hover {
    border-color: var(--color-primary);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.1);
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.step-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

.step-description code {
    padding: var(--space-1) var(--space-2);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--color-accent);
}

.step-code {
    padding: var(--space-4);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.step-code pre {
    margin: 0;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.code-key { color: var(--color-accent); }
.code-string { color: var(--color-success); }
.code-comment { color: var(--color-text-muted); }
.code-value { color: var(--color-success); }

/* ============================================
   Architecture Section
   ============================================ */

.architecture {
    background: var(--color-bg-secondary);
}

.arch-diagram {
    max-width: 900px;
    margin: 0 auto var(--space-12);
}

.arch-layer {
    padding: var(--space-6);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}

.arch-layer-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
}

.arch-components {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.arch-component {
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
    min-width: 140px;
}

.arch-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-2);
}

.arch-name {
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-1);
}

.arch-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.arch-arrow {
    color: var(--color-text-muted);
    font-size: var(--font-size-xl);
}

.arch-connector {
    display: flex;
    justify-content: center;
    color: var(--color-text-muted);
}

.arch-pod {
    margin-top: var(--space-4);
    padding: var(--space-6);
    background: var(--color-bg);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
}

.arch-pod-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--space-4);
    color: var(--color-text-secondary);
}

.arch-pod-containers {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
}

.arch-container {
    padding: var(--space-4) var(--space-6);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
}

.arch-container.envoy {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.arch-container-icon {
    font-size: 1.25rem;
    margin-bottom: var(--space-1);
}

.arch-container-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

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

.arch-ebpf {
    margin-top: var(--space-4);
    padding: var(--space-2);
    background: rgba(34, 211, 238, 0.1);
    border: 1px dashed var(--color-accent);
    border-radius: var(--radius-md);
    text-align: center;
}

.arch-ebpf-label {
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    font-weight: 500;
}

.tech-stack {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.tech-item {
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
}

.tech-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* ============================================
   Getting Started Section
   ============================================ */

.getting-started-content {
    max-width: 800px;
    margin: 0 auto;
}

.install-tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.install-tab {
    padding: var(--space-3) var(--space-6);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.install-tab:hover {
    color: var(--color-text);
}

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

.install-panel {
    display: none;
}

.install-panel.active {
    display: block;
}

.install-step {
    margin-bottom: var(--space-6);
}

.install-step-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.install-step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.install-step-title {
    font-weight: 500;
}

.code-block {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.code-block pre {
    margin: 0;
    padding: var(--space-4);
    overflow-x: auto;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.copy-btn {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    padding: var(--space-2);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    opacity: 0;
    transition: all var(--transition-fast);
}

.code-block:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    color: var(--color-text);
    border-color: var(--color-border-hover);
}

.copy-btn.copied {
    color: var(--color-success);
}

/* ============================================
   CTA Section
   ============================================ */

.cta {
    background: var(--gradient-hero);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.cta-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

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

.footer {
    padding: var(--space-12) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.footer-tagline {
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.footer-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-copyright {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

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

@media (max-width: 1024px) {
    .hero-visual {
        display: none;
    }
    
    .hero-container {
        max-width: 100%;
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        justify-content: center;
        gap: var(--space-6);
        background: var(--color-bg);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-cta {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
    
    .step-number {
        margin: 0 auto;
    }
    
    .arch-components {
        flex-direction: column;
    }
    
    .arch-arrow {
        transform: rotate(90deg);
    }
    
    .arch-pod-containers {
        flex-direction: column;
    }
    
    .arch-container-arrow {
        transform: rotate(90deg);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .stat-divider {
        width: 40px;
        height: 1px;
    }
    
    .install-tabs {
        flex-direction: column;
    }
}