/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    /* Colors - Modern Enterprise Palette */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary: #64748b;
    --secondary-dark: #475569;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Neutrals */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.875rem;
}

h4 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

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

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

code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background-color: var(--gray-100);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
}

pre {
    background-color: var(--gray-900);
    color: var(--gray-100);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: 1rem 0;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
}

strong {
    font-weight: 600;
    color: var(--gray-900);
}

/* ============================================
   Layout
   ============================================ */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

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

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing-md);
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-menu a {
    color: var(--gray-700);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--primary);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-top: 72px;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    color: white;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
}

.hero-description strong {
    color: white;
    font-weight: 700;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    color: white;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

/* ============================================
   Platform Overview
   ============================================ */
.platform-overview {
    padding: var(--spacing-2xl) 0;
    background-color: white;
}

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

.feature-card {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.feature-card p {
    color: var(--gray-600);
    margin: 0;
}

/* ============================================
   Architecture Patterns
   ============================================ */
.architecture {
    padding: var(--spacing-2xl) 0;
    background-color: var(--gray-50);
}

.ha-diagram-container {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
}

.ha-diagram-container svg {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

.pattern-block {
    background-color: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.pattern-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.pattern-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 50%;
    flex-shrink: 0;
}

.pattern-header h3 {
    font-size: 1.75rem;
    margin: 0;
}

.pattern-content {
    display: grid;
    gap: var(--spacing-lg);
}

.pattern-description {
    color: var(--gray-700);
}

.pattern-description strong {
    color: var(--gray-900);
}

.code-block {
    background-color: var(--gray-900);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.code-block pre {
    margin: 0;
}

.pattern-benefits {
    background-color: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--success);
}

.pattern-benefits h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.pattern-benefits ul {
    list-style: none;
    display: grid;
    gap: var(--spacing-xs);
}

.pattern-benefits li {
    color: var(--gray-700);
    font-weight: 500;
}

/* Saga Flow */
.saga-flow {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    overflow-x: auto;
}

.saga-step {
    flex: 1;
    min-width: 180px;
}

.saga-step-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.saga-step-content h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.saga-step-content p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin: 0;
}

.saga-arrow {
    font-size: 1.5rem;
    color: var(--primary);
    flex-shrink: 0;
}

/* Locking Types */
.locking-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.locking-card {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 2px solid var(--gray-200);
}

.locking-card h4 {
    font-size: 1.125rem;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.locking-use-case {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Fault Tolerance */
.fault-tolerance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.ft-card {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 2px solid var(--gray-200);
}

.ft-card h4 {
    font-size: 1.125rem;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.ft-detail {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-top: var(--spacing-sm);
    font-family: var(--font-mono);
}

.circuit-states {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
}

.state {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.state-closed {
    background-color: var(--success);
    color: white;
}

.state-open {
    background-color: var(--danger);
    color: white;
}

.state-half-open {
    background-color: var(--warning);
    color: white;
}

.state-arrow {
    color: var(--gray-400);
}

/* ============================================
   Performance Section
   ============================================ */
.performance {
    padding: var(--spacing-2xl) 0;
    background-color: white;
}

.performance-reasons {
    margin-bottom: var(--spacing-2xl);
}

.performance-reasons h3 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

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

.reason-card {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
}

.reason-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.reason-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.reason-card p {
    color: var(--gray-600);
    margin: 0;
}

.performance-metrics {
    margin-bottom: var(--spacing-2xl);
}

.performance-metrics h3 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.metrics-table {
    overflow-x: auto;
}

.metrics-table table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.metrics-table th,
.metrics-table td {
    padding: 1rem;
    text-align: left;
}

.metrics-table th {
    background-color: var(--primary);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

.metrics-table tr:nth-child(even) {
    background-color: var(--gray-50);
}

.metric-highlight {
    color: var(--success);
    font-weight: 700;
}

.scaling-info {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
}

.scaling-info h3 {
    margin-bottom: var(--spacing-sm);
}

.scaling-description {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

.scaling-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    max-width: 900px;
    margin: 0 auto;
}

.scaling-feature {
    padding: 0.75rem;
    background-color: white;
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--gray-700);
}

/* ============================================
   Security Section
   ============================================ */
.security {
    padding: var(--spacing-2xl) 0;
    background-color: var(--gray-50);
}

.security-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.comparison-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.comparison-bad {
    background-color: #fef2f2;
    border: 2px solid var(--danger);
}

.comparison-good {
    background-color: #f0fdf4;
    border: 2px solid var(--success);
}

.comparison-card h3 {
    margin-bottom: var(--spacing-md);
}

.comparison-card ul {
    list-style: none;
}

.comparison-card li {
    padding: 0.5rem 0;
    color: var(--gray-700);
}

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

.security-feature {
    padding: var(--spacing-lg);
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.security-feature h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.security-feature p {
    color: var(--gray-600);
    margin: 0;
}

/* ============================================
   Compliance Section
   ============================================ */
.compliance {
    padding: var(--spacing-2xl) 0;
    background-color: white;
}

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

.compliance-card {
    padding: var(--spacing-xl);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.compliance-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.compliance-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.compliance-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    color: var(--primary);
}

.compliance-subtitle {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.compliance-card ul {
    list-style: none;
}

.compliance-card li {
    padding: 0.5rem 0;
    color: var(--gray-700);
    position: relative;
    padding-left: 1.5rem;
}

.compliance-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 700;
}

/* ============================================
   Services Overview
   ============================================ */
.services-overview {
    padding: var(--spacing-2xl) 0;
    background-color: var(--gray-50);
}

.services-categories {
    display: grid;
    gap: var(--spacing-lg);
}

.service-category {
    padding: var(--spacing-xl);
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.service-category h3 {
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--primary);
}

.service-list {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
}

.service-list li {
    padding: 0.75rem;
    background-color: var(--gray-50);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.service-list li:hover {
    background-color: var(--gray-100);
    transform: translateX(4px);
}

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

/* ============================================
   Use Cases Section
   ============================================ */
.use-cases {
    padding: var(--spacing-2xl) 0;
    background-color: white;
}

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

.use-case-card {
    padding: var(--spacing-xl);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.use-case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.use-case-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.use-case-card ul {
    list-style: none;
}

.use-case-card li {
    padding: 0.5rem 0;
    color: var(--gray-700);
    position: relative;
    padding-left: 1.5rem;
}

.use-case-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

.cta-content h2 {
    font-size: 2.5rem;
    color: white;
    margin-bottom: var(--spacing-sm);
}

.cta-content > p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

.cta-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.cta-option {
    padding: var(--spacing-xl);
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.cta-option h3 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.cta-option p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

.cta-option .btn {
    width: 100%;
}

/* ============================================
   Demo Login Section
   ============================================ */
.demo-login-section {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
    max-width: 450px;
    margin: 0 auto;
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-header h2 {
    font-size: 2rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.login-header p {
    color: var(--gray-600);
    font-size: 1rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input {
    padding: var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'JetBrains Mono', monospace;
    background-color: var(--gray-50);
    color: var(--gray-900);
    transition: all var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    background-color: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input[readonly] {
    cursor: default;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-large:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background-color: var(--gray-900);
    color: var(--gray-400);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    color: white;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--gray-400);
}

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

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-800);
    text-align: center;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero {
        padding: 6rem 0 3rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .features-grid,
    .reasons-grid,
    .locking-types,
    .fault-tolerance-grid,
    .security-comparison,
    .security-features,
    .compliance-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .saga-flow {
        flex-direction: column;
    }

    .saga-arrow {
        transform: rotate(90deg);
    }

    .nav-menu {
        display: none;
    }
}

/* ============================================
   Utilities
   ============================================ */
.text-center {
    text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* ============================================
   Detailed Service Cards
   ============================================ */
.services-overview {
    padding: var(--spacing-2xl) 0;
    background-color: var(--gray-50);
}

.service-detailed-card {
    display: flex;
    gap: var(--spacing-lg);
    background-color: white;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--primary);
    transition: all var(--transition-base);
}

.service-detailed-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-xl);
}

.service-number {
    flex-shrink: 0;
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 800;
}

.service-content {
    flex: 1;
}

.service-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.service-badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background-color: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.service-description {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-700);
    font-size: 1rem;
}

.service-description strong {
    color: var(--primary);
}

.service-tech-detail {
    margin-bottom: var(--spacing-md);
    color: var(--gray-600);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.service-tech-detail strong {
    color: var(--gray-900);
    font-weight: 600;
}

.service-tech-detail code {
    background-color: var(--gray-100);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.service-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: var(--spacing-md);
}

.feature-tag {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background-color: var(--gray-100);
    color: var(--gray-700);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 500;
    border: 1px solid var(--gray-200);
}

/* Category Colors */
.category-pki {
    border-left-color: #2563eb; /* Blue */
}

.category-pki .service-number {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
}

.category-pki .service-badge {
    background-color: #2563eb;
}

.category-signing {
    border-left-color: #8b5cf6; /* Purple */
}

.category-signing .service-number {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa);
}

.category-signing .service-badge {
    background-color: #8b5cf6;
}

.category-infrastructure {
    border-left-color: #64748b; /* Gray */
}

.category-infrastructure .service-number {
    background: linear-gradient(135deg, #64748b, #94a3b8);
}

.category-infrastructure .service-badge {
    background-color: #64748b;
}

.category-security {
    border-left-color: #dc2626; /* Red */
}

.category-security .service-number {
    background: linear-gradient(135deg, #dc2626, #ef4444);
}

.category-security .service-badge {
    background-color: #dc2626;
}

.category-business {
    border-left-color: #059669; /* Green */
}

.category-business .service-number {
    background: linear-gradient(135deg, #059669, #10b981);
}

.category-business .service-badge {
    background-color: #059669;
}

.category-trust {
    border-left-color: #d97706; /* Orange */
}

.category-trust .service-number {
    background: linear-gradient(135deg, #d97706, #f59e0b);
}

.category-trust .service-badge {
    background-color: #d97706;
}

.category-compliance {
    border-left-color: #7c3aed; /* Violet */
}

.category-compliance .service-number {
    background: linear-gradient(135deg, #7c3aed, #8b5cf6);
}

.category-compliance .service-badge {
    background-color: #7c3aed;
}

/* ============================================
   Simplified Footer
   ============================================ */
.footer-content-simple {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.footer-info h3 {
    color: white;
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
}

.footer-info p {
    color: var(--gray-400);
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.footer-info a {
    color: var(--gray-300);
    transition: color var(--transition-fast);
}

.footer-info a:hover {
    color: white;
}

.footer-info strong {
    color: var(--gray-300);
    font-weight: 600;
}

/* Responsive Design for Service Cards */
@media (max-width: 768px) {
    .service-detailed-card {
        flex-direction: column;
    }

    .service-number {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .service-content h3 {
        font-size: 1.25rem;
    }

    .service-tech-detail {
        font-size: 0.875rem;
    }
}

/* ============================================
   Concept Cards (Fogalom magyarázatok)
   ============================================ */
.concept-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

.concept-card {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 2px solid var(--gray-300);
    margin: 0.5rem;
    transition: all var(--transition-fast);
}

.concept-card:hover {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.concept-title {
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--primary);
    margin-bottom: 0.375rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.concept-title::before {
    content: "💡";
    font-size: 1rem;
}

.concept-description {
    font-size: 0.8125rem;
    color: var(--gray-700);
    line-height: 1.5;
    margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .concept-cards {
        grid-template-columns: 1fr;
    }
}