/* ================================
   CSS Reset & Base Styles
   ================================ */

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #1f2937;
    background-color: #ffffff;
    overflow-x: hidden;
}

/* ================================
   CSS Variables / Design System
   ================================ */

:root {
    /* Colors */
    --primary-blue: #1e3a8a;
    --primary-blue-light: #1e40af;
    --accent-red: #dc2626;
    --accent-gold: #fbbf24;
    --dark-tech: #0f172a;
    --purple-accent: #7c3aed;
    --success-green: #16a34a;
    --danger-red: #dc2626;
    --warning-orange: #f59e0b;

    /* Grays */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Breakpoints */
    --breakpoint-mobile: 768px;
    --breakpoint-tablet: 1024px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ================================
   Typography
   ================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.2rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
}

p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--gray-700);
}

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

/* ================================
   Layout Utilities
   ================================ */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-700);
    line-height: 1.7;
}

/* ================================
   Buttons
   ================================ */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    transition: var(--transition-base);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(30, 58, 138, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(30, 58, 138, 0.4);
}

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

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

.btn-lg {
    padding: 1.25rem 2.5rem;
    font-size: 1.2rem;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition-base);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1rem var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-blue);
}

.brand-icon {
    font-size: 2rem;
}

.brand-tagline {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-left: 0.5rem;
    padding-left: 0.5rem;
    border-left: 2px solid var(--gray-300);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--gray-700);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-base);
}

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

.nav-link.btn-primary-nav {
    background: var(--primary-blue);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
}

.nav-link.btn-primary-nav:hover {
    background: var(--primary-blue-light);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 3px;
    transition: var(--transition-base);
}

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
    color: white;
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255, 255, 255, 0.03) 2px, rgba(255, 255, 255, 0.03) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(255, 255, 255, 0.03) 2px, rgba(255, 255, 255, 0.03) 4px);
    opacity: 0.5;
}

.hero-flag {
    position: absolute;
    font-size: 300px;
    opacity: 0.05;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    user-select: none;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.hero-eyebrow {
    display: inline-block;
    background: rgba(251, 191, 36, 0.2);
    color: var(--accent-gold);
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    border: 2px solid rgba(251, 191, 36, 0.3);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.2rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.text-gradient {
    background: linear-gradient(135deg, #fbbf24 0%, #dc2626 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.4rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.9);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-disclaimer {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    font-style: italic;
    margin-bottom: var(--spacing-2xl);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--accent-gold);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: white;
}

.stat-source {
    display: block;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: underline;
    margin-top: 0.5rem;
}

.stat-source:hover {
    color: var(--accent-gold);
}

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

/* ================================
   Badges Bar
   ================================ */

.badges-bar {
    background: var(--gray-900);
    padding: var(--spacing-lg) 0;
}

.badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.badge {
    background: linear-gradient(135deg, var(--accent-red) 0%, var(--primary-blue) 100%);
    color: white;
    padding: 1rem 2rem;
    border-radius: 2rem;
    font-weight: 800;
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    box-shadow: 0 4px 14px rgba(220, 38, 38, 0.3);
}

/* ================================
   American Advantage Section
   ================================ */

.american-advantage {
    background: var(--gray-50);
}

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

.advantage-card {
    background: white;
    border-radius: 1rem;
    padding: var(--spacing-xl);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition-base);
    border: 3px solid transparent;
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-blue);
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.advantage-card h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.advantage-card p {
    color: var(--gray-700);
    line-height: 1.7;
}

/* ================================
   Timezone Section
   ================================ */

.timezone-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #3730a3 100%);
    color: white;
}

.timezone-section .section-title,
.timezone-section .section-subtitle {
    color: white;
}

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

.timezone-column {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.column-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid;
}

.column-title.danger {
    color: #fca5a5;
    border-color: var(--accent-red);
}

.column-title.success {
    color: #86efac;
    border-color: var(--success-green);
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.timeline-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.time {
    font-weight: 700;
    color: var(--accent-gold);
    min-width: 80px;
    font-size: 1.1rem;
}

.event {
    flex: 1;
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0.5rem;
    border-left: 4px solid rgba(255, 255, 255, 0.3);
}

/* ================================
   AI Revolution Section
   ================================ */

.ai-revolution {
    background: var(--dark-tech);
    color: white;
}

.ai-revolution .section-title,
.ai-revolution .section-subtitle {
    color: white;
}

.comparison-table-wrapper {
    overflow-x: auto;
    border-radius: 1rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

.comparison-table th,
.comparison-table td {
    padding: 1.5rem;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-table thead th {
    background: rgba(255, 255, 255, 0.1);
    font-weight: 800;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.col-danger {
    background: rgba(220, 38, 38, 0.15);
    color: #fca5a5;
}

.col-warning {
    background: rgba(245, 158, 11, 0.15);
    color: #fcd34d;
}

.col-success {
    background: rgba(22, 163, 74, 0.15);
    color: #86efac;
}

.metric-name {
    font-weight: 700;
    color: white;
}

/* ================================
   AI Applications Section
   ================================ */

.ai-applications {
    background: var(--gray-50);
}

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

.ai-card {
    background: white;
    border-radius: 1rem;
    padding: var(--spacing-xl);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition-base);
    border: 3px solid transparent;
    position: relative;
    overflow: hidden;
}

.ai-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--purple-accent) 100%);
    transform: scaleX(0);
    transition: var(--transition-base);
}

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

.ai-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

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

.ai-card h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    font-size: 1.3rem;
}

.ai-card p {
    color: var(--gray-700);
    line-height: 1.6;
}

/* ================================
   Cost Section
   ================================ */

.cost-section {
    background: linear-gradient(135deg, #6b21a8 0%, #7c3aed 50%, #8b5cf6 100%);
    color: white;
}

.cost-section .section-title,
.cost-section .section-subtitle {
    color: white;
}

.cost-breakdown {
    max-width: 1000px;
    margin: 0 auto;
}

.cost-table-wrapper {
    overflow-x: auto;
    border-radius: 1rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    margin-bottom: var(--spacing-xl);
}

.cost-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.95);
}

.cost-table th,
.cost-table td {
    padding: 1.5rem;
    text-align: left;
    color: var(--gray-900);
    border-bottom: 1px solid var(--gray-200);
}

.cost-table thead th {
    background: var(--gray-900);
    color: white;
    font-weight: 800;
    font-size: 1.1rem;
}

.cost-table small {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-top: 0.25rem;
}

.cost-table .col-danger {
    background: rgba(220, 38, 38, 0.1);
    color: var(--accent-red);
    font-weight: 700;
    font-size: 1.1rem;
}

.cost-table .col-success {
    background: rgba(22, 163, 74, 0.1);
    color: var(--success-green);
    font-weight: 700;
    font-size: 1.1rem;
}

.success-text {
    font-weight: 700;
}

.total-row {
    border-top: 3px solid var(--gray-900);
}

.total-row td {
    font-size: 1.3rem;
    font-weight: 900;
    padding: 2rem 1.5rem;
}

.savings-banner {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: 0 8px 24px rgba(251, 191, 36, 0.4);
}

.savings-amount {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--gray-900);
    line-height: 1;
}

.savings-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-top: var(--spacing-sm);
}

/* ================================
   Transparency Section
   ================================ */

.transparency-section {
    background: var(--gray-50);
}

.transparency-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.transparency-stat {
    background: white;
    border-radius: 1rem;
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 3px solid var(--accent-red);
}

.stat-big {
    font-size: 4rem;
    font-weight: 900;
    color: var(--accent-red);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.fraud-patterns {
    max-width: 1200px;
    margin: 0 auto;
}

.patterns-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-xl);
    color: var(--gray-900);
}

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

.pattern-card {
    background: white;
    border-radius: 1rem;
    padding: var(--spacing-lg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-left: 6px solid var(--accent-red);
    transition: var(--transition-base);
}

.pattern-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.pattern-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: var(--accent-red);
    color: white;
    border-radius: 50%;
    font-weight: 900;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.pattern-card h4 {
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.pattern-card p {
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.pattern-source {
    font-size: 0.85rem;
    color: var(--primary-blue);
    text-decoration: underline;
}

.pattern-source:hover {
    color: var(--accent-red);
}

.case-study-callout {
    max-width: 900px;
    margin: var(--spacing-3xl) auto 0;
    background: linear-gradient(135deg, rgba(220, 38, 38, 0.1) 0%, rgba(239, 68, 68, 0.1) 100%);
    border: 3px solid var(--accent-red);
    border-radius: 1rem;
    padding: var(--spacing-xl);
}

.case-study-callout h3 {
    color: var(--accent-red);
    margin-bottom: var(--spacing-md);
    font-size: 1.8rem;
}

.case-study-callout p {
    color: var(--gray-800);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.case-study-callout ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-md);
}

.case-study-callout li {
    color: var(--gray-800);
    line-height: 1.6;
    padding-left: var(--spacing-md);
    border-left: 4px solid var(--accent-red);
    background: rgba(255, 255, 255, 0.5);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0.25rem;
}

.case-study-callout li strong {
    color: var(--accent-red);
}

.callout-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--accent-red);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
}

.callout-footer em {
    color: var(--accent-red);
}

/* ================================
   Protection Section
   ================================ */

.protection-section {
    background: white;
}

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

.protection-card {
    background: var(--gray-50);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    border: 3px solid var(--success-green);
    transition: var(--transition-base);
}

.protection-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(22, 163, 74, 0.2);
    background: white;
}

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

.protection-card h3 {
    color: var(--success-green);
    margin-bottom: var(--spacing-sm);
    font-size: 1.3rem;
}

.protection-card p {
    color: var(--gray-700);
    line-height: 1.6;
}

/* ================================
   Engineer Signup Section
   ================================ */

.engineer-signup-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
    color: white;
}

.engineer-signup-section .section-title,
.engineer-signup-section .section-subtitle {
    color: white;
}

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

.engineer-group-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    transition: var(--transition-base);
}

.engineer-group-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-gold);
}

.group-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.engineer-group-card h3 {
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.engineer-group-card p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.group-stats {
    background: rgba(251, 191, 36, 0.15);
    border-left: 4px solid var(--accent-gold);
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.95);
}

.group-stats strong {
    color: var(--accent-gold);
    display: block;
    margin-bottom: 0.25rem;
}

.engineer-signup-form-wrapper {
    max-width: 900px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    padding: var(--spacing-2xl);
    border: 2px solid rgba(255, 255, 255, 0.15);
}

.signup-form-title {
    text-align: center;
    color: white;
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.signup-form-subtitle {
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xl);
}

.engineer-signup-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.engineer-signup-form input,
.engineer-signup-form textarea,
.engineer-signup-form select {
    padding: 1rem 1.5rem;
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-radius: 0.5rem;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.95);
    color: var(--gray-900);
    font-family: var(--font-primary);
    transition: var(--transition-base);
}

.engineer-signup-form input:focus,
.engineer-signup-form textarea:focus,
.engineer-signup-form select:focus {
    outline: none;
    border-color: var(--accent-gold);
    background: white;
    box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.1);
}

.engineer-signup-form select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23374151' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 3rem;
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.5rem;
}

.form-checkbox label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

.form-checkbox input[type="checkbox"] {
    margin-top: 0.25rem;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.form-note {
    text-align: center;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(251, 191, 36, 0.1);
    border-radius: 0.5rem;
    border: 1px solid rgba(251, 191, 36, 0.3);
}

.form-disclaimer {
    text-align: center;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: var(--spacing-sm);
    font-style: italic;
    line-height: 1.5;
}

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

.cta-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #dc2626 50%, #1e3a8a 100%);
    color: white;
}

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

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
    color: white;
}

.cta-subtitle {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

.cta-form-wrapper {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

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

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

.cta-form input,
.cta-form textarea {
    padding: 1rem 1.5rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 0.5rem;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.95);
    color: var(--gray-900);
    font-family: var(--font-primary);
    transition: var(--transition-base);
}

.cta-form input:focus,
.cta-form textarea:focus {
    outline: none;
    border-color: var(--accent-gold);
    background: white;
}

.cta-form textarea {
    resize: vertical;
    min-height: 120px;
}

.cta-form button {
    width: 100%;
}

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

.cta-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    font-weight: 700;
    font-size: 0.95rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

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

.footer {
    background: var(--gray-900);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-xl);
}

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

.footer-brand .brand-name {
    font-size: 1.8rem;
    font-weight: 800;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
}

.footer-column h4 {
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-base);
}

.footer-column a:hover {
    color: white;
    padding-left: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

.footer-note {
    margin-top: var(--spacing-sm);
    font-weight: 600;
    color: var(--accent-gold);
}

.footer-disclaimer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.75rem;
    line-height: 1.6;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* ================================
   How the AI Agent Model Works Section
   ================================ */

.how-it-works-section {
    background: linear-gradient(135deg, #f9fafb 0%, #e5e7eb 100%);
}

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

.phase-card {
    background: white;
    border-radius: 1rem;
    padding: var(--spacing-xl);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition-base);
    border: 3px solid transparent;
    text-align: center;
}

.phase-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.phase-card:nth-child(1) {
    border-color: #fbbf24;
}

.phase-card:nth-child(2) {
    border-color: #3730a3;
}

.phase-card:nth-child(3) {
    border-color: #f59e0b;
}

.phase-card:nth-child(1):hover {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.05) 0%, rgba(251, 191, 36, 0.02) 100%);
}

.phase-card:nth-child(2):hover {
    background: linear-gradient(135deg, rgba(55, 48, 163, 0.05) 0%, rgba(55, 48, 163, 0.02) 100%);
}

.phase-card:nth-child(3):hover {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05) 0%, rgba(245, 158, 11, 0.02) 100%);
}

.phase-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.phase-time {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.phase-card h3 {
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.phase-list {
    list-style: none;
    text-align: left;
    padding-left: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.phase-list li {
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--gray-700);
    line-height: 1.6;
}

.phase-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: 900;
}

/* ================================
   Benefits Grid (AI Agents Advantage)
   ================================ */

.benefits-grid {
    margin-top: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.benefits-title {
    text-align: center;
    color: white;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
}

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

.benefit-item {
    background: rgba(22, 163, 74, 0.15);
    color: #86efac;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    border-left: 4px solid var(--success-green);
    transition: var(--transition-base);
}

.benefit-item:hover {
    background: rgba(22, 163, 74, 0.25);
    transform: translateX(5px);
}

/* ================================
   Card Highlights (Advantage Cards)
   ================================ */

.card-highlight {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.1) 0%, rgba(30, 64, 175, 0.1) 100%);
    border-left: 4px solid var(--primary-blue);
    border-radius: 0.5rem;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--primary-blue);
    font-style: italic;
}

/* ================================
   Protection Grid - 8 Cards Layout
   ================================ */

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

/* ================================
   The 5 C's Section
   ================================ */

.five-cs-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
    color: white;
}

.five-cs-section .section-title,
.five-cs-section .section-subtitle {
    color: white;
}

.five-cs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.cs-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.cs-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-gold);
    box-shadow: 0 12px 24px rgba(251, 191, 36, 0.3);
}

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

.cs-letter {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 4rem;
    font-weight: 900;
    color: rgba(251, 191, 36, 0.1);
    line-height: 1;
}

.cs-card h3 {
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.cs-card p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.cs-impact {
    background: rgba(251, 191, 36, 0.15);
    border-left: 4px solid var(--accent-gold);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 0.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.95);
    font-style: italic;
}

.five-cs-callout {
    background: rgba(251, 191, 36, 0.1);
    border: 3px solid var(--accent-gold);
    border-radius: 1rem;
    padding: var(--spacing-xl);
    text-align: center;
}

.five-cs-callout h3 {
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    font-size: 1.8rem;
}

.five-cs-callout p {
    color: white;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.five-cs-callout p:last-child {
    margin-bottom: 0;
}

.cs-myth-buster {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 2px solid rgba(251, 191, 36, 0.3);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--accent-gold);
}

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

@media (max-width: 768px) {
    /* Navigation */
    .nav-toggle {
        display: flex;
    }

    .brand-tagline {
        display: none;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition-base);
    }

    .nav-menu.active {
        max-height: 500px;
    }

    /* Hero */
    .hero {
        min-height: auto;
        padding: var(--spacing-3xl) 0;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

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

    .btn-lg {
        width: 100%;
    }

    /* Badges */
    .badges {
        gap: var(--spacing-sm);
    }

    .badge {
        font-size: 0.9rem;
        padding: 0.75rem 1.5rem;
    }

    /* Grid layouts */
    .advantage-grid,
    .ai-grid,
    .protection-grid {
        grid-template-columns: 1fr;
    }

    .timezone-comparison {
        grid-template-columns: 1fr;
    }

    .pattern-grid {
        grid-template-columns: 1fr;
    }

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    /* Form */
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .advantage-grid,
    .ai-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pattern-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ================================
   Animations & Utilities
   ================================ */

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

.fade-in {
    animation: fadeIn 0.8s ease-out;
}

.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ================================
   Print Styles
   ================================ */

@media print {
    .navbar,
    .nav-toggle,
    .cta-form,
    .btn {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }
}