:root {
  --bg: #0a0d14;
  --bg-soft: #111726;
  --text: #eaf0ff;
  --muted: #a9b4d0;
  --pink: #ff4fbf;
  --blue: #4fa3ff;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

body.light {
  --bg: #f5f8ff;
  --bg-soft: #ffffff;
  --text: #111933;
  --muted: #4f5f86;
  --pink: #e61ea4;
  --blue: #1568e9;
  --card: rgba(19, 36, 77, 0.04);
  --border: rgba(19, 36, 77, 0.14);
  --shadow: 0 18px 40px rgba(20, 33, 70, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: radial-gradient(circle at 10% 0%, rgba(79, 163, 255, 0.18), transparent 35%),
    radial-gradient(circle at 90% 0%, rgba(255, 79, 191, 0.18), transparent 40%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.15;
  pointer-events: none;
  z-index: -1;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
  z-index: 20;
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  text-decoration: none;
  font-weight: 800;
  font-size: 1.15rem;
}

.logo-cool {
  color: var(--pink);
}

.logo-kids,
.logo-dev {
  color: var(--blue);
}

.nav-links {
  display: flex;
  gap: 1.1rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}

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

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: 999px;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.hero {
  padding: 5.5rem 0 2.5rem;
}

.badge,
.mono {
  font-family: "JetBrains Mono", monospace;
}

.badge {
  display: inline-block;
  border: 1px solid var(--border);
  background: var(--card);
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  color: var(--muted);
  margin-bottom: 1.2rem;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.8rem);
  max-width: 14ch;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.3rem);
  margin-bottom: 1rem;
}

.hero-copy {
  max-width: 65ch;
  color: var(--muted);
}

.accent-pink {
  color: var(--pink);
}

.accent-blue {
  color: var(--blue);
}

.hero-cta {
  margin-top: 1.3rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn {
  text-decoration: none;
  border-radius: 12px;
  font-weight: 700;
  padding: 0.78rem 1.05rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(90deg, var(--pink), var(--blue));
  box-shadow: var(--shadow);
}

.btn-secondary {
  color: var(--text);
  border-color: var(--border);
  background: var(--card);
}

.section {
  padding: 2.5rem 0;
}

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

.card,
.steps > div,
.chips span,
.contact-form {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 16px;
}

.card {
  padding: 1rem;
}

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

.steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.steps > div {
  padding: 0.9rem;
}

.steps span {
  font-family: "JetBrains Mono", monospace;
  color: var(--blue);
  margin-right: 0.3rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.chips span {
  padding: 0.45rem 0.75rem;
  font-weight: 600;
}

.contact-section p {
  color: var(--muted);
}

.contact-form {
  margin-top: 1rem;
  padding: 1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.7rem;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 0.35rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  padding: 0.75rem 0.85rem;
  font: inherit;
}

textarea {
  resize: vertical;
}

.form-btn {
  margin-top: 0.35rem;
  width: 100%;
  border: 0;
  cursor: pointer;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 1rem 0 2rem;
}

.footer-content p {
  margin: 0;
  color: var(--muted);
}

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

@media (max-width: 880px) {
  .cards,
  .steps,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding-top: 4.3rem;
  }
}