:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-soft: #f1f5f9;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #2563eb;
  --success: #16a34a;
  --on-accent: #ffffff;
}

body[data-theme="dark"] {
  --bg: #000000;
  --surface: #0a0a0a;
  --surface-soft: #111111;
  --text: #f5f5f5;
  --muted: #a3a3a3;
  --border: rgba(255, 255, 255, 0.1);
  --accent: #ffffff;
  --success: #ffffff;
  --on-accent: #000000;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 24px 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.brand {
  font-size: 26px;
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 14px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.15s ease;
}

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

.actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-soft);
  color: var(--text);
  cursor: pointer;
  line-height: 0;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  background: color-mix(in srgb, var(--accent) 8%, var(--surface-soft));
  color: var(--accent);
}

.theme-icon {
  display: block;
}

main {
  display: grid;
  gap: 14px;
}

.section h2,
.hero h1 {
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.1;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
}

body[data-theme="dark"] .card {
  box-shadow: none;
}

.hero {
  padding: 24px;
}

.badge {
  display: inline-block;
  margin: 0 0 12px;
  padding: 7px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

body[data-theme="dark"] .badge {
  background: #ffffff;
  color: #000000;
}

.muted {
  color: var(--muted);
}

.hero-buttons {
  display: flex;
  gap: 10px;
  margin: 14px 0 0;
}

.grid {
  display: grid;
  gap: 14px;
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.plan h3 {
  margin: 8px 0 6px;
}

.plan ul {
  margin: 0;
}

.price {
  color: var(--accent);
  font-size: 30px;
  font-weight: 700;
  margin: 8px 0;
}

body[data-theme="dark"] .price {
  color: #ffffff;
}

.plan {
  display: flex;
  flex-direction: column;
}

.plan ul {
  padding-left: 18px;
  margin-bottom: 14px;
  color: var(--muted);
  line-height: 1.4;
}

.plan .btn {
  margin-top: auto;
  padding: 8px 14px;
  font-size: 13px;
  width: 100%;
}

.plan-popular {
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

body[data-theme="dark"] .plan-popular {
  background: #111111;
  border-color: rgba(255, 255, 255, 0.22);
}

.faq {
  display: grid;
  gap: 10px;
}

.faq h2 {
  margin-bottom: 4px;
}

.footer {
  margin-top: 14px;
  text-align: center;
  background: var(--surface-soft);
}

body[data-theme="dark"] .footer {
  background: var(--surface-soft);
}

.footer h2 {
  margin: 0 0 10px;
}

.footer-contacts {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px 16px;
  align-items: center;
}

.footer-contacts p {
  margin: 0;
}

.small {
  font-size: 12px;
}

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

.small a:hover {
  text-decoration: underline;
}

body[data-theme="dark"] .small a {
  color: #ffffff;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: 0;
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: opacity 0.12s ease, transform 0.12s ease;
}

.btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.btn-small {
  font-size: 13px;
  padding: 9px 14px;
}

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

body[data-theme="dark"] .btn-primary {
  background: #ffffff;
  color: #000000;
  font-weight: 700;
}

body[data-theme="dark"] .theme-toggle:hover {
  border-color: rgba(255, 255, 255, 0.2);
  background: #161616;
  color: #ffffff;
}

.btn-secondary {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  color: var(--text);
}

@media (max-width: 1024px) {
  .topbar {
    flex-wrap: wrap;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 720px) {
  .page {
    padding: 16px 12px 32px;
  }

  .nav {
    width: 100%;
    order: 3;
    justify-content: flex-start;
  }

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

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

  .hero {
    padding: 18px;
  }

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