:root {
  --bg: #0b1020;
  --surface: #121932;
  --surface-border: rgba(255, 255, 255, 0.1);
  --text: #f3f6ff;
  --muted: #9aa7c7;
  --accent: #4f7cff;
  --accent-hover: #6b91ff;
  --success: #2dd4bf;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(circle at top right, #1b2852 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--success));
  color: #08101f;
  font-weight: 800;
}

.nav-link {
  color: var(--text);
  text-decoration: none;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--surface-border);
  font-size: 0.92rem;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.25);
}

.hero {
  padding: 64px 0 48px;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(45, 212, 191, 0.12);
  border: 1px solid rgba(45, 212, 191, 0.35);
  color: var(--success);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  max-width: 780px;
  margin: 0 auto 20px;
}

.hero p {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 620px;
  margin: 0 auto 32px;
}

.actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease, background-color 0.2s ease;
}

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

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

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

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

.preview-panel {
  margin: 24px auto 48px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  padding: 24px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.tab-btn {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--surface-border);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
}

.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.tab-content h2 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

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

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-bottom: 64px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 14px;
  padding: 22px;
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.card p {
  color: var(--muted);
  font-size: 0.94rem;
}

.site-footer {
  border-top: 1px solid var(--surface-border);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}