/* ============================================
   SIE - Safety Intelligence Engine
   Apple-Inspired Redesign
   ============================================ */

/* CSS Variables - Apple-Inspired Palette */
:root {
    /* From SIE Logo */
    --primary: #334155;        /* Deep slate blue */
    --primary-light: #475569;  /* Lighter slate */
    --primary-dark: #1e293b;   /* Darker slate */

    /* Accent colors */
    --accent: #0071e3;         /* Apple blue for CTAs */
    --accent-hover: #0077ed;   /* Hover state */

    /* Status colors (keep for safety scores) */
    --safe: #34c759;           /* Apple green */
    --monitor: #007aff;        /* Apple blue */
    --intervene: #ff9500;      /* Apple orange */
    --oos: #ff3b30;            /* Apple red */

    /* Neutrals */
    --background: #ffffff;
    --surface: #f5f5f7;        /* Apple gray */
    --text: #1d1d1f;           /* Apple text */
    --text-secondary: #86868b; /* Apple secondary */
    --border: #d2d2d7;         /* Apple border */
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.65;
    color: var(--text);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 32px;
}

h1, h2, h3, h4 {
    line-height: 1.15;
    font-weight: 600;
    letter-spacing: -0.015em;
}

h1 {
    font-size: 3.5rem;
    font-weight: 600;
}

h2 {
    font-size: 2.5rem;
    font-weight: 600;
}

h3 {
    font-size: 1.75rem;
    font-weight: 600;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    margin-bottom: 1rem;
    font-size: 1.0625rem;
    line-height: 1.7;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-hover);
}

ul {
    list-style: none;
}

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

.navbar {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 48px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 36px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--text);
    opacity: 0.8;
    transition: opacity 0.3s ease;
    text-decoration: none;
    font-weight: 400;
    font-size: 0.875rem;
}

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

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

.hero {
    background: var(--background);
    padding: 104px 32px 96px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 80px;
    min-height: 85vh;
}

.hero-content {
    max-width: 560px;
}

.badge {
    display: inline-block;
    background: var(--surface);
    color: var(--text-secondary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 24px;
    letter-spacing: 0.01em;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 24px;
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--text);
}

.hero-subtitle {
    font-size: 1.3125rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.5;
    font-weight: 400;
}

.cta-button {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 14px 28px;
    border-radius: 980px;
    font-weight: 400;
    font-size: 1.0625rem;
    text-decoration: none;
    transition: background 0.3s ease, transform 0.2s ease;
}

.cta-button:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
    text-decoration: none;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.score-display {
    text-align: center;
}

.score-ring {
    width: 220px;
    height: 220px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.score-ring.safe {
    background: linear-gradient(135deg, var(--safe) 0%, #30b350 100%);
}

.score-number {
    font-size: 5rem;
    font-weight: 600;
    color: white;
    letter-spacing: -0.03em;
}

.score-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--safe);
    letter-spacing: 0.06em;
}

/* ============================================
   Problem Section
   ============================================ */

.problem-section {
    padding: 104px 32px;
    background: var(--surface);
}

.problem-section h2 {
    text-align: center;
    margin-bottom: 64px;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.problem-card {
    padding: 40px 32px;
    background: var(--background);
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.problem-card:hover {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.problem-icon {
    width: 56px;
    height: 56px;
    background: var(--surface);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 24px;
    font-size: 1.5rem;
    font-weight: 500;
}

.problem-card h3 {
    margin-bottom: 16px;
    color: var(--text);
    font-size: 1.5rem;
}

.problem-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
    font-size: 1rem;
    line-height: 1.6;
}

/* ============================================
   Solution Section
   ============================================ */

.solution-section {
    padding: 104px 32px;
    background: var(--primary-dark);
    color: white;
}

.solution-section h2 {
    text-align: center;
    margin-bottom: 8px;
    color: white;
}

.section-subtitle {
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 64px;
    font-size: 1.25rem;
    font-weight: 400;
}

.bridge-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}

.bridge-side {
    background: rgba(255, 255, 255, 0.06);
    padding: 40px 32px;
    border-radius: 16px;
    min-width: 260px;
    backdrop-filter: blur(10px);
}

.bridge-side h4 {
    margin-bottom: 20px;
    color: var(--accent);
    font-size: 1.125rem;
}

.bridge-side ul li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.85);
    font-size: 1rem;
}

.bridge-side ul li:last-child {
    border-bottom: none;
}

.bridge-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.arrow-text {
    background: var(--accent);
    color: white;
    padding: 12px 24px;
    border-radius: 980px;
    font-weight: 600;
    font-size: 1.125rem;
}

.arrow-line {
    width: 2px;
    height: 48px;
    background: var(--accent);
}

/* ============================================
   Engines Section
   ============================================ */

.engines-section {
    padding: 104px 32px;
    background: var(--background);
}

.engines-section h2,
.engines-section .section-subtitle {
    text-align: center;
}

.engines-section .section-subtitle {
    color: var(--text-secondary);
}

.engines-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 64px;
}

.engine-card {
    padding: 32px 28px;
    background: var(--surface);
    border-radius: 16px;
    border: 1px solid transparent;
    transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.engine-card:hover {
    border-color: var(--border);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.engine-card.highlight {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: white;
}

.engine-card.highlight .engine-abbr {
    background: var(--accent);
}

.engine-card.highlight h4 {
    color: white;
}

.engine-card.highlight p {
    color: rgba(255, 255, 255, 0.85);
}

.engine-abbr {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.8125rem;
    margin-bottom: 20px;
    letter-spacing: 0.03em;
}

.engine-card h4 {
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.engine-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* ============================================
   Determination Section
   ============================================ */

.determination-section {
    padding: 104px 32px;
    background: var(--surface);
}

.determination-section h2,
.determination-section .section-subtitle {
    text-align: center;
}

.determination-section .section-subtitle {
    color: var(--text-secondary);
}

.determination-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-top: 64px;
}

.determination-card {
    padding: 40px 32px;
    border-radius: 16px;
    text-align: center;
    color: white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.determination-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.determination-card.safe { background: var(--safe); }
.determination-card.monitor { background: var(--monitor); }
.determination-card.intervene { background: var(--intervene); }
.determination-card.oos { background: var(--oos); }

.det-score {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.determination-card h4 {
    margin-bottom: 8px;
    font-size: 1.3125rem;
}

.determination-card p {
    opacity: 0.95;
    font-size: 0.9375rem;
    line-height: 1.5;
    margin-bottom: 0;
}

/* ============================================
   Defensibility Section
   ============================================ */

.defensibility-section {
    padding: 104px 32px;
    background: var(--background);
}

.defensibility-section h2,
.defensibility-section .section-subtitle {
    text-align: center;
}

.defensibility-section .section-subtitle {
    color: var(--text-secondary);
}

.defensibility-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    margin-top: 64px;
    align-items: center;
}

.defensibility-text ul {
    margin: 24px 0;
    padding-left: 24px;
}

.defensibility-text li {
    list-style: disc;
    margin-bottom: 12px;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.audit-card {
    background: var(--primary-dark);
    border-radius: 16px;
    overflow: hidden;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.875rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.audit-header {
    background: var(--primary);
    color: white;
    padding: 16px 20px;
    font-weight: 600;
}

.audit-line {
    padding: 14px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.8125rem;
}

.audit-line:last-child {
    border-bottom: none;
}

.audit-time {
    color: var(--safe);
    margin-right: 16px;
    font-weight: 500;
}

/* ============================================
   Future Section
   ============================================ */

.future-section {
    padding: 104px 32px;
    background: var(--accent);
    color: white;
}

.future-content {
    display: flex;
    gap: 48px;
    align-items: flex-start;
}

.future-icon {
    flex-shrink: 0;
    width: 72px;
    height: 72px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.future-icon svg {
    width: 36px;
    height: 36px;
}

.future-text h3 {
    margin-bottom: 16px;
    font-size: 2rem;
    font-weight: 600;
}

.future-text p {
    opacity: 0.95;
    line-height: 1.7;
}

.coming-soon {
    margin-top: 32px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.coming-soon span {
    display: block;
    font-weight: 600;
    margin-bottom: 16px;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.coming-soon ul {
    padding-left: 24px;
}

.coming-soon li {
    list-style: disc;
    margin-bottom: 10px;
    opacity: 0.95;
    line-height: 1.6;
}

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

.cta-section {
    padding: 104px 32px;
    background: var(--primary-dark);
    color: white;
    text-align: center;
}

.cta-section h2 {
    margin-bottom: 16px;
    color: white;
}

.cta-section p {
    max-width: 600px;
    margin: 0 auto 32px;
    opacity: 0.9;
    font-size: 1.125rem;
}

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

.footer {
    background: var(--surface);
    color: var(--text);
    padding: 64px 32px 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-logo-img {
    height: 80px;
    width: auto;
    margin-bottom: 16px;
    display: block;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-size: 0.9375rem;
}

.footer-tagline {
    font-size: 0.8125rem;
}

.footer-nav-row {
    display: flex;
    justify-content: center;
    gap: 80px;
    flex-wrap: wrap;
}

.footer h4 {
    margin-bottom: 16px;
    color: var(--text);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}

.footer-links,
.footer-contact {
    text-align: center;
}

.footer ul li {
    margin-bottom: 8px;
}

.footer a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
    font-size: 0.875rem;
}

.footer a:hover {
    color: var(--text);
    text-decoration: none;
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
}

/* ============================================
   About Page
   ============================================ */

.about-hero {
    background: var(--primary-dark);
    color: white;
    padding: 104px 32px;
    text-align: center;
}

.about-hero h1 {
    max-width: 800px;
    margin: 0 auto 24px;
    font-size: 3.5rem;
}

.about-hero .hero-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.origin-section {
    padding: 104px 32px;
    background: var(--background);
}

.origin-text {
    max-width: 700px;
    margin: 0 auto;
}

.origin-text h2 {
    margin-bottom: 32px;
}

.origin-text .quote {
    font-size: 1.75rem;
    font-style: italic;
    color: var(--text-secondary);
    margin: 40px 0;
    padding-left: 24px;
    border-left: 3px solid var(--accent);
    line-height: 1.5;
    font-weight: 400;
}

.build-section {
    padding: 104px 32px;
    background: var(--surface);
}

.build-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.build-text h2 {
    margin-bottom: 24px;
}

.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

.timeline-dot {
    position: absolute;
    left: -32px;
    top: 4px;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    border: 3px solid var(--surface);
}

.timeline-content h4 {
    color: var(--text);
    margin-bottom: 8px;
    font-size: 1.125rem;
}

.timeline-content p {
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.6;
}

.build-text ul {
    margin: 24px 0;
    padding-left: 24px;
}

.build-text li {
    list-style: disc;
    margin-bottom: 16px;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.6;
}

/* Founder Section */
.founder-section {
    padding: 104px 32px;
    background: var(--background);
}

.founder-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.founder-section h2 {
    margin-bottom: 48px;
}

.founder-profile {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.founder-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center 25%;
    border: 4px solid var(--surface);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.founder-name {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text);
    margin: 8px 0 0 0;
}

.founder-title {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin: 0;
}

.founder-bio {
    max-width: 600px;
    color: var(--text-secondary);
    margin-top: 16px;
    line-height: 1.7;
}

.mission-section {
    padding: 104px 32px;
    background: var(--primary-dark);
    color: white;
}

.mission-section h2 {
    text-align: center;
    margin-bottom: 64px;
    color: white;
}

.mission-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.mission-card {
    padding: 40px 32px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.mission-number {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.mission-card h3 {
    margin-bottom: 16px;
    color: white;
}

.mission-card p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 0;
    line-height: 1.6;
}

.small-fleet-section {
    padding: 104px 32px;
    background: var(--background);
}

.small-fleet-content {
    max-width: 800px;
    margin: 0 auto;
}

.small-fleet-content h2 {
    text-align: center;
    margin-bottom: 32px;
}

.comparison {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    margin: 48px 0;
    flex-wrap: wrap;
}

.comparison-side {
    background: var(--surface);
    padding: 32px 28px;
    border-radius: 16px;
    min-width: 220px;
}

.comparison-side h4 {
    color: var(--text);
    margin-bottom: 16px;
}

.comparison-side ul li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

.comparison-side ul li:last-child {
    border-bottom: none;
}

.comparison-arrow {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.emphasis {
    font-size: 1.375rem;
    font-weight: 500;
    color: var(--accent);
    text-align: center;
    margin-top: 48px;
    line-height: 1.5;
}

.status-section {
    padding: 104px 32px;
    background: var(--surface);
}

.status-card {
    max-width: 700px;
    margin: 0 auto;
    background: var(--background);
    padding: 48px 40px;
    border-radius: 24px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.status-badge {
    display: inline-block;
    background: var(--intervene);
    color: white;
    padding: 8px 16px;
    border-radius: 980px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 0.01em;
}

.status-card h2 {
    margin-bottom: 24px;
}

.status-card ul {
    text-align: left;
    max-width: 400px;
    margin: 24px auto;
    padding-left: 24px;
}

.status-card li {
    list-style: disc;
    margin-bottom: 12px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Contact Page
   ============================================ */

.contact-hero {
    background: var(--primary-dark);
    color: white;
    padding: 104px 32px;
    text-align: center;
}

.contact-hero h1 {
    margin-bottom: 16px;
}

.contact-hero .hero-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.contact-section {
    padding: 104px 32px;
    background: var(--surface);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact-info h2 {
    margin-bottom: 32px;
}

.contact-method {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--accent);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-icon svg {
    width: 22px;
    height: 22px;
    color: white;
}

.contact-details h4 {
    margin-bottom: 4px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.contact-details a {
    font-size: 1.375rem;
    font-weight: 500;
    color: var(--accent);
}

.contact-details p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-top: 8px;
    margin-bottom: 0;
    line-height: 1.5;
}

.contact-note {
    background: var(--background);
    padding: 24px;
    border-radius: 16px;
    margin-top: 32px;
}

.contact-note h3 {
    margin-bottom: 16px;
    font-size: 1rem;
    font-weight: 600;
}

.contact-note ul {
    padding-left: 24px;
}

.contact-note li {
    list-style: disc;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.form-card {
    background: var(--background);
    padding: 40px 36px;
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.form-card h2 {
    margin-bottom: 8px;
}

.form-card > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--background);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

.submit-button {
    background: var(--accent);
    color: white;
    padding: 14px 24px;
    border: none;
    border-radius: 980px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
    margin-top: 8px;
}

.submit-button:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

.form-note {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 24px;
    margin-bottom: 0;
}

.faq-section {
    padding: 104px 32px;
    background: var(--background);
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 64px;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.faq-item {
    padding: 32px 28px;
    background: var(--surface);
    border-radius: 16px;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.faq-item:hover {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.faq-item h4 {
    margin-bottom: 12px;
    color: var(--text);
    font-size: 1.125rem;
}

.faq-item p {
    color: var(--text-secondary);
    margin-bottom: 0;
    font-size: 0.9375rem;
    line-height: 1.6;
}

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

@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 80px 24px 72px;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .defensibility-content,
    .build-content,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .bridge-visual {
        flex-direction: column;
    }

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

    .future-content {
        flex-direction: column;
    }
}

@media (max-width: 600px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }

    .hero h1 {
        font-size: 2.5rem;
    }

    .about-hero h1 {
        font-size: 2.25rem;
    }

    .container {
        padding: 0 20px;
    }

    .nav-container {
        padding: 0 20px;
    }

    .nav-links {
        gap: 24px;
        font-size: 0.8125rem;
    }

    .logo-img {
        height: 32px;
    }

    .problem-section,
    .solution-section,
    .engines-section,
    .determination-section,
    .defensibility-section,
    .future-section,
    .cta-section,
    .footer,
    .about-hero,
    .origin-section,
    .build-section,
    .founder-section,
    .mission-section,
    .small-fleet-section,
    .status-section,
    .contact-hero,
    .contact-section,
    .faq-section {
        padding: 72px 20px;
    }

    .comparison {
        flex-direction: column;
        gap: 16px;
    }

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

    .footer-nav-row {
        flex-direction: column;
        gap: 32px;
    }

    .footer-logo-img {
        height: 64px;
    }

    .founder-photo {
        width: 160px;
        height: 160px;
    }
}