:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface2: #1a1a1a;
  --border: #2a2a2a;
  --text: #e5e5e5;
  --text-muted: #888;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  z-index: 100;
}

.logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo:hover { text-decoration: none; }

nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
nav a { color: var(--text-muted); font-size: 0.9rem; transition: color 0.2s; }
nav a:hover { color: var(--text); text-decoration: none; }

.lang-switch {
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

/* Main */
main { flex: 1; }

/* Hero */
.hero {
  text-align: center;
  padding: 6rem 2rem 5rem;
  max-width: 760px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: var(--accent);
  font-size: 0.8rem;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.03em;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.2rem;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 2.5rem;
}

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  text-decoration: none;
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: #222; text-decoration: none; }

.hero-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

/* Features */
.features {
  padding: 5rem 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.section-label {
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.section-title {
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Converter list */
.converter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.tag {
  font-size: 0.72rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  color: var(--text-muted);
}

/* Purchase */
.purchase {
  padding: 5rem 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.purchase-card {
  max-width: 420px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
}

.price {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 0.25rem;
}
.price span { font-size: 1.2rem; font-weight: 400; color: var(--text-muted); }

.price-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.purchase-btn {
  width: 100%;
  padding: 0.9rem;
  font-size: 1rem;
}

.purchase-details {
  margin-top: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.purchase-details span::before { content: "✓  "; color: var(--accent); }

/* Requirements */
.requirements {
  padding: 4rem 2rem;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.req-grid {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.req-item {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.req-item strong {
  display: block;
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer a { color: var(--text-muted); }
footer a:hover { color: var(--text); }

footer div {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* Legal pages */
.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.legal h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.legal-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
}

.legal h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.legal p, .legal li {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.legal ul, .legal ol {
  padding-left: 1.5rem;
  margin-top: 0.5rem;
}

.legal li { margin-bottom: 0.4rem; }

.legal table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.88rem;
}

.legal th, .legal td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  text-align: left;
  color: var(--text-muted);
}

.legal th { background: var(--surface); color: var(--text); font-weight: 600; }

/* Contact */
.contact {
  max-width: 560px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.contact h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.contact-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 2.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  color: var(--text);
  font-size: 0.92rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-group textarea { min-height: 140px; resize: vertical; }

.form-status {
  margin-top: 1rem;
  font-size: 0.88rem;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  display: none;
}
.form-status.success { background: rgba(34,197,94,0.1); color: #4ade80; border: 1px solid rgba(34,197,94,0.2); display: block; }
.form-status.error { background: rgba(239,68,68,0.1); color: #f87171; border: 1px solid rgba(239,68,68,0.2); display: block; }

/* Success page */
.success-page {
  max-width: 520px;
  margin: 0 auto;
  padding: 6rem 2rem;
  text-align: center;
}

.success-icon { font-size: 3rem; margin-bottom: 1.5rem; }

.success-page h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.success-page p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 600px) {
  header { padding: 1rem; }
  .hero { padding: 4rem 1rem 3rem; }
  .features, .requirements, .purchase { padding: 3rem 1rem; }
  footer { flex-direction: column; align-items: flex-start; }
}