* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

:root {
  --bg: #ffffff;
  --surface: #f8fafc;
  --text: #1f2937;
  --muted: #4b5563;
  --header: #111827;
  --header-text: #f9faf8;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --border: #d1d5db;
}

body.dark-mode {
  --bg: #0f172a;
  --surface: #111827;
  --text: #e5e7eb;
  --muted: #cbd5e1;
  --header: #020617;
  --header-text: #f8fafc;
  --accent: #60a5fa;
  --accent-strong: #3b82f6;
  --border: #334155;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

main {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.section {
  padding: 72px 0;
}

.site-header {
  background: var(--header);
  color: var(--header-text);
  padding: 14px min(4vw, 40px);
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 20;
}

.logo {
  color: var(--header-text);
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 700;
}

.site-nav {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.site-nav a {
  color: var(--header-text);
  text-decoration: none;
  opacity: 0.9;
}

.site-nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration: underline;
}

.icon-btn {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: var(--header-text);
  background: transparent;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
}

.menu-toggle {
  display: none;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 24px;
}

.eyebrow {
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 12px;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin-bottom: 12px;
}

h3 {
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--muted);
  margin-bottom: 24px;
}

.hero-image {
  width: 100%;
  max-width: 460px;
  border-radius: 14px;
  justify-self: center;
  border: 1px solid var(--border);
}

.hero-actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  border-radius: 8px;
  text-decoration: none;
  padding: 10px 16px;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-outline {
  color: var(--accent);
  border-color: var(--accent);
  background: transparent;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  border: 2px solid var(--accent);
  margin-bottom: 10px;
}

.quote {
  background: var(--surface);
  border-radius: 14px;
  padding-inline: 24px;
}

.quote blockquote {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-style: italic;
}

.quote-author {
  text-align: right;
  margin-top: 12px;
  font-weight: 700;
}

.cta {
  background: var(--accent);
  color: #fff;
  border-radius: 14px;
  padding-inline: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.cta .btn-outline {
  color: #fff;
  border-color: #fff;
}

.newsletter-form,
.contact-form {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}

.newsletter-form {
  grid-template-columns: 1fr auto;
  max-width: 560px;
}

input,
textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.form-message {
  margin-top: 10px;
  color: var(--muted);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.pricing-card .price {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  margin: 8px 0;
}

.pricing-card.featured {
  border-color: var(--accent);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
}

.back-to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: 0.2s ease;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.site-footer {
  background: var(--header);
  color: var(--header-text);
  text-align: center;
  padding: 28px 12px;
  margin-top: 40px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .grid-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 700px) {
  .site-header {
    grid-template-columns: auto auto auto;
  }

  .menu-toggle {
    display: inline-block;
  }

  .site-nav {
    display: none;
    grid-column: 1 / -1;
    flex-direction: column;
    background: rgba(2, 6, 23, 0.95);
    padding: 12px;
    border-radius: 8px;
  }

  .site-nav.open {
    display: flex;
  }

  .newsletter-form {
    grid-template-columns: 1fr;
  }

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

  .cta {
    flex-direction: column;
    align-items: flex-start;
  }
}