/* === AIxSafe Design System — Dark Theme === */

:root {
  --color-bg: #000000;
  --color-bg-alt: #0a0a0a;
  --color-bg-card: #111111;
  --color-bg-elevated: #1a1a1a;
  --color-text: #ffffff;
  --color-text-muted: #a1a1aa;
  --color-text-dim: #71717a;
  --color-primary: #1a56db;
  --color-primary-hover: #1443b0;
  --color-border: #222222;
  --color-border-light: #2a2a2a;
  --color-accent: #1a56db;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --radius: 8px;
}

/* === Reset === */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

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

/* === Typography === */

h1, h2, h3, h4 {
  line-height: 1.15;
  font-weight: 700;
  color: var(--color-text);
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
}

p {
  color: var(--color-text-muted);
}

.hero p,
.section-header p {
  max-width: 640px;
}

/* === Section Label (eyebrow) === */

.section-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 12px;
}

/* === Layout === */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 88px 0;
}

section.alt {
  background: var(--color-bg-alt);
}

/* === Header === */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

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

nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

nav a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 400;
  transition: color 0.15s;
}

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

nav a.active {
  color: var(--color-text);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-text);
}

/* === Buttons === */

.btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-align: center;
  line-height: 1.4;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border-light);
}

.btn-outline:hover {
  background: var(--color-bg-elevated);
  color: var(--color-text);
  text-decoration: none;
}

/* === Hero === */

.hero {
  padding: 120px 0 100px;
  text-align: center;
}

.hero h1 {
  max-width: 800px;
  margin: 0 auto 24px;
}

.hero p {
  font-size: 1.2rem;
  margin: 0 auto 44px;
  max-width: 600px;
  color: var(--color-text-muted);
}

/* === Section Header === */

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header p {
  margin: 14px auto 0;
  font-size: 1.1rem;
}

/* === Grid === */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* === Cards === */

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.card .card-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.card .card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: rgba(79, 70, 229, 0.15);
  color: var(--color-accent);
  margin-bottom: 16px;
}

.card .card-icon svg {
  width: 22px;
  height: 22px;
}

/* === Compliance Banner === */

.compliance-banner {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px;
}

.compliance-banner h3 {
  margin-bottom: 14px;
}

.compliance-banner ul {
  list-style: none;
  padding: 0;
}

.compliance-banner li {
  padding: 6px 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.compliance-banner li::before {
  content: "—";
  color: var(--color-accent);
  font-weight: 600;
  flex-shrink: 0;
}

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

.cta-section {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  padding: 88px 0;
}

.cta-section h2 {
  color: var(--color-text);
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--color-text-muted);
  margin: 0 auto 32px;
}

/* === Forms === */

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  background: var(--color-bg-card);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-dim);
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2371717a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-group .required {
  color: #ef4444;
}

.form-message {
  padding: 14px 20px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  margin-bottom: 20px;
  display: none;
}

.form-message.success {
  background: rgba(34, 197, 94, 0.1);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.2);
  display: block;
}

.form-message.error {
  background: rgba(239, 68, 68, 0.1);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.2);
  display: block;
}

/* === Footer === */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-inner p {
  font-size: 0.85rem;
  color: var(--color-text-dim);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-dim);
}

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

/* === Page Header === */

.page-header {
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  margin-bottom: 14px;
  font-size: 2.75rem;
}

.page-header p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
}

/* === Content Sections === */

.content-block {
  margin-bottom: 48px;
}

.content-block:last-child {
  margin-bottom: 0;
}

.content-block h2 {
  margin-bottom: 16px;
  font-size: 1.75rem;
}

.content-block h3 {
  margin-bottom: 10px;
}

.content-block p {
  margin-bottom: 12px;
}

.content-block ul {
  list-style: none;
  padding: 0;
}

.content-block li {
  padding: 6px 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.content-block li::before {
  content: "—";
  color: var(--color-accent);
  font-weight: 600;
  flex-shrink: 0;
}

/* === Lifecycle Steps === */

.lifecycle {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  position: relative;
}

.lifecycle-step {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.lifecycle-step:last-child {
  border-bottom: none;
}

.lifecycle-step .step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.lifecycle-step h3 {
  margin-bottom: 6px;
}

/* === Disclosure List === */

.disclosure-item {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.disclosure-item h3 {
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.disclosure-item h3 .icon {
  color: var(--color-accent);
  flex-shrink: 0;
}

.disclosure-item p {
  color: var(--color-text-muted);
}

/* === Contact Layout === */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info h3 {
  margin-bottom: 12px;
  margin-top: 28px;
}

.contact-info h3:first-child {
  margin-top: 0;
}

.contact-info p {
  font-size: 0.95rem;
}

/* === Responsive === */

@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  section {
    padding: 56px 0;
  }

  .hero {
    padding: 72px 0 56px;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
  }

  nav.open {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .btn {
    width: 100%;
  }
}