:root {
  --bg: #0b1020;
  --surface: #151b2e;
  --text: #e7eaf3;
  --muted: #9aa3bd;
  --accent: #4f46e5;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  --max: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, rgba(79, 70, 229, 0.25), transparent), var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: var(--max);
  margin: 0 auto;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(11, 16, 32, 0.7);
}

.brand { font-weight: 800; letter-spacing: -0.02em; font-size: 1.15rem; }

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.25rem;
  font-size: 0.95rem;
}

nav a:hover, nav a:focus-visible { color: var(--text); }

main { max-width: var(--max); margin: 0 auto; padding: 0 1.5rem 3rem; }

.hero { padding: 4rem 0 2.5rem; text-align: center; }

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero p { color: var(--muted); max-width: 620px; margin: 0 auto 1.5rem; font-size: 1.1rem; }

.cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, filter 0.15s ease;
}

.cta:hover { filter: brightness(1.1); transform: translateY(-1px); }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  padding: 2rem 0;
}

.card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.card h2 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.builder, .preview {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.field { margin-bottom: 1rem; }

label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
}

input[type="text"], textarea {
  width: 100%;
  background: #0f1526;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 0.65rem 0.8rem;
  color: var(--text);
  font: inherit;
  resize: vertical;
}

input[type="color"] {
  width: 56px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  background: #0f1526;
  cursor: pointer;
}

input:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.actions { display: flex; gap: 0.75rem; margin-top: 0.5rem; }

button {
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 0.6rem 1.1rem;
  background: var(--accent);
  color: #fff;
  transition: filter 0.15s ease;
}

button:hover { filter: brightness(1.1); }

button.ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text);
}

.error { color: #f87171; margin-top: 0.75rem; font-size: 0.9rem; }

.preview-window {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 1rem;
  background: #fff;
  color: #111;
  min-height: 260px;
}

.preview-inner { padding: 2rem; }
.preview-inner h2 { margin: 0 0 0.25rem; font-size: 1.75rem; }
.pv-tagline { color: #555; margin: 0 0 1rem; }
.preview-inner p { margin: 0; }

.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 1.5rem;
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

@media (max-width: 560px) {
  .site-header { padding: 0.75rem 1rem; }
  nav a { margin-left: 0.8rem; font-size: 0.85rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}