:root {
  --navy: #0f2942;
  --navy-light: #1b3a5c;
  --accent: #0f766e;
  --accent-light: #14b8a6;
  --bg: #f7f9fb;
  --card-bg: #ffffff;
  --text: #1a2733;
  --text-muted: #5b6b78;
  --border: #dde4ea;
  --ok-bg: #ecfdf5;
  --ok-border: #10b981;
  --warn-bg: #fffbeb;
  --warn-border: #f59e0b;
  --no-bg: #fef2f2;
  --no-border: #ef4444;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  background: var(--navy);
  color: #fff;
  padding: 18px 0;
}

.site-header .wrap {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-accent { color: var(--accent-light); }

.tagline {
  font-size: 0.85rem;
  color: #b7c4d1;
}

.intro {
  padding: 36px 0 8px;
}

h1 {
  font-size: 1.6rem;
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--navy);
}

.sub {
  color: var(--text-muted);
  margin: 0;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 24px 0;
  box-shadow: 0 1px 3px rgba(15, 41, 66, 0.06);
}

.card h2 {
  margin-top: 0;
  font-size: 1.15rem;
  color: var(--navy);
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

input[type="date"],
input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  margin-bottom: 6px;
  font-family: inherit;
}

.hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0 0 18px;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0 0 18px;
}

legend {
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0;
  margin-bottom: 8px;
}

.radio {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 400;
  margin-right: 20px;
  cursor: pointer;
}

.radio input { cursor: pointer; }

button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 22px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

button:hover { background: #0d5c56; }

.result {
  margin-top: 20px;
  padding: 16px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #f4f7f9;
}

.result.ok { background: var(--ok-bg); border-color: var(--ok-border); }
.result.warn { background: var(--warn-bg); border-color: var(--warn-border); }
.result.no { background: var(--no-bg); border-color: var(--no-border); }

.result h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.result p { margin: 0 0 8px; }
.result p:last-child { margin-bottom: 0; }

.disclaimer {
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-top: 32px;
}

.disclaimer a { color: var(--accent); }

.site-footer {
  margin-top: 40px;
  padding: 24px 0 40px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

@media (max-width: 480px) {
  h1 { font-size: 1.35rem; }
  .card { padding: 18px; }
  .radio { display: flex; margin-right: 0; margin-bottom: 8px; }
}