:root {
  color-scheme: light dark;
  --bg: #0b0e14;
  --bg-alt: #131826;
  --fg: #e8ecf4;
  --fg-muted: #9aa4b8;
  --accent: #4f8cff;
  --accent-fg: #ffffff;
  --border: #232a3b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  max-width: 960px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  margin-right: auto;
  color: var(--fg);
  text-decoration: none;
}

.brand-mark { flex-shrink: 0; }

.nav-link {
  color: var(--fg-muted);
  text-decoration: none;
}
.nav-link:hover { color: var(--fg); }

.lang-switcher { display: flex; gap: 0.6rem; margin-left: 0.5rem; }
.lang-switcher a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.lang-switcher a:hover { color: var(--fg); }
.lang-switcher a.lang-current { color: var(--accent); }

.hero {
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-bottom: 1px solid var(--border);
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  text-align: center;
}

h1 {
  font-size: 2.25rem;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.lead {
  color: var(--fg-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  text-decoration: none;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  transition: opacity 0.15s;
}
.cta:hover { opacity: 0.9; }

main { max-width: 960px; margin: 0 auto; padding: 0 2rem; }

.story {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 2rem 0;
  text-align: center;
  font-size: 1.05rem;
  color: var(--fg-muted);
}
.story strong { color: var(--fg); }

.usecases { padding: 4rem 0 1rem; text-align: center; }
.usecases h2 { margin-bottom: 0.5rem; }
.section-lead {
  color: var(--fg-muted);
  max-width: 560px;
  margin: 0 auto 2.5rem;
}

.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  text-align: left;
}

.usecase h3 { margin-bottom: 0.5rem; }
.usecase p { color: var(--fg-muted); margin: 0; }

.how { padding: 3rem 0; text-align: center; }
.how h2 { margin-bottom: 2.5rem; }

.how-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  text-align: left;
  margin-bottom: 2rem;
}

.how-step { display: flex; gap: 1rem; align-items: flex-start; }
.how-number {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 700;
  font-size: 0.9rem;
}
.how-step p { margin: 0; color: var(--fg-muted); }

.how-detail {
  max-width: 640px;
  margin: 0 auto;
  color: var(--fg-muted);
  font-size: 0.9rem;
}
.how pre { max-width: 640px; margin: 1rem auto; }

.pricing { padding: 3rem 0 5rem; text-align: center; }
.pricing h2 { margin-bottom: 2rem; }

.plans {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  max-width: 960px;
  margin: 0 auto;
}

.plan {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  background: var(--bg-alt);
  text-align: left;
  display: flex;
  flex-direction: column;
}

.plan h3 { margin-top: 0; }

.billing-toggle { display: flex; gap: 0.4rem; margin: 0.75rem 0 0; }
.toggle-btn {
  flex: 1;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg-muted);
  border-radius: 6px;
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
}
.toggle-btn.active { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }

.plan .price { font-size: 1.5rem; font-weight: 700; margin: 0.5rem 0 0.25rem; }
.plan .price-detail { color: var(--fg-muted); font-size: 0.9rem; margin: 0 0 1.25rem; }
.plan ul { padding-left: 1.1rem; color: var(--fg-muted); margin-bottom: 1.5rem; flex-grow: 1; }
.plan .cta { display: block; text-align: center; }

.pricing-note {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin-top: 2rem;
}

.contact { text-align: center; padding: 3rem 0 5rem; }
.contact a { color: var(--accent); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
  background: var(--bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}
pre {
  text-align: left;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0;
}
pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.5;
  white-space: pre;
}

footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 2rem;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.success {
  max-width: 560px;
  margin: 0 auto;
  padding: 6rem 2rem;
  text-align: center;
}
.success h1 { font-size: 1.75rem; }
.success p { color: var(--fg-muted); }
.success .cta { margin-top: 1.5rem; }

.page-header {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 2rem 1rem;
  text-align: center;
}
.page-header h1 { font-size: 1.75rem; }

.faq {
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem 2rem 5rem;
}
.faq-item { margin-bottom: 2rem; }
.faq-item h3 { margin-bottom: 0.5rem; }
.faq-item p { color: var(--fg-muted); margin: 0; }