:root {
  --blue: #2563eb;
  --blue-dark: #1e40af;
  --ink: #0f172a;
  --muted: #64748b;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; text-decoration: none; color: var(--ink); font-size: 1.1rem; }
.nav-right { display: flex; align-items: center; gap: 0.5rem; }
.lang-label { color: var(--muted); font-size: 0.9rem; }
.lang-select {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-size: 0.95rem;
}
.hero {
  max-width: 800px;
  margin: 2.5rem auto 1.5rem;
  padding: 0 1.5rem;
  text-align: center;
}
.hero h1 { font-size: 2rem; margin: 0 0 0.75rem; line-height: 1.2; }
.hero .sub { color: var(--muted); font-size: 1.05rem; max-width: 640px; margin: 0 auto 1.25rem; }
.hero-pills { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; }
.pill {
  background: #eff6ff;
  color: var(--blue-dark);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
}
.wrap { max-width: 800px; margin: 0 auto 3rem; padding: 0 1.5rem; }
.tool {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}
.tool h2 { margin: 0 0 0.25rem; font-size: 1.25rem; }
.muted { color: var(--muted); font-size: 0.95rem; margin: 0 0 1rem; }
textarea, .input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
}
.input { margin-bottom: 0.5rem; }
textarea:focus, .input:focus {
  outline: 2px solid var(--blue);
  outline-offset: 1px;
  border-color: var(--blue);
}
.btn {
  display: inline-block;
  padding: 0.65rem 1.25rem;
  border: 0;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.75rem;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-primary:disabled { background: #93c5fd; cursor: not-allowed; }
.output {
  margin-top: 1rem;
  padding: 1rem;
  background: #f1f5f9;
  border-radius: 8px;
  white-space: pre-wrap;
  font-size: 0.98rem;
  min-height: 1px;
}
.output:empty { display: none; }
.output.error { background: #fee2e2; color: #991b1b; }
.info {
  background: #eff6ff;
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  color: #1e3a8a;
}
.info h3 { margin: 0 0 0.5rem; }
.info ol { margin: 0 0 0.75rem; padding-left: 1.25rem; }
.disclaimer { color: #475569; font-size: 0.9rem; margin: 0.5rem 0 0; }
.foot {
  display: flex;
  gap: 1rem;
  justify-content: center;
  padding: 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  background: #fff;
}
.foot a { color: var(--muted); }