:root {
  --ink: #1f2933;
  --paper: #f7f5f0;
  --line: #d8d2c4;
  --accent: #b45309;
  --accent-soft: #fef3e2;
  --white: #ffffff;
  --ok: #166534;
  --ng: #b91c1c;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.site-header .logo {
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  color: var(--ink);
}

.site-header nav {
  display: flex;
  gap: 14px;
  font-size: 13px;
  flex-wrap: wrap;
}

.site-header nav a { color: var(--ink); text-decoration: none; }
.site-header nav a:hover { color: var(--accent); }

.hero {
  min-height: 130px;
  padding: clamp(16px, 2vw, 32px) clamp(16px, 4vw, 40px);
  background: var(--accent-soft);
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.4;
}

.hero p {
  margin: 0;
  max-width: 640px;
  font-size: 14px;
  color: #4b5563;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px clamp(16px, 4vw, 40px) 80px;
}

.wide main { max-width: 960px; }

h2 { font-size: 19px; margin-top: 40px; }
h3 { font-size: 16px; }

.card {
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 6px;
  padding: 16px 20px;
  margin-bottom: 16px;
}

table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 16px 0; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
th { background: var(--accent-soft); }

.qual-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 20px 0; }
.qual-card { border: 1px solid var(--line); background: var(--white); border-radius: 6px; padding: 16px; }
.qual-card h3 { margin-top: 0; }
.badge { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); margin-bottom: 8px; }
.badge.pending { background: #eee; color: #666; }

.source-note { font-size: 12px; color: #6b7280; margin-top: 4px; }

.quiz-question { border: 1px solid var(--line); background: var(--white); border-radius: 6px; padding: 18px; margin-bottom: 16px; }
.quiz-question p.q-text { font-weight: 600; margin: 0 0 10px; }
.quiz-question .choices { display: flex; flex-direction: column; gap: 6px; }
.quiz-question label { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; cursor: pointer; }
.quiz-question .explanation { display: none; margin-top: 10px; padding: 10px 12px; background: var(--accent-soft); border-radius: 4px; font-size: 13px; }
.quiz-question .explanation a { word-break: break-all; }
.quiz-question.answered .explanation { display: block; }
.quiz-question.correct { border-color: var(--ok); }
.quiz-question.incorrect { border-color: var(--ng); }

#quiz-summary { font-weight: 700; margin: 20px 0; padding: 14px; background: var(--white); border: 1px solid var(--line); border-radius: 6px; }

footer {
  border-top: 1px solid var(--line);
  padding: 20px clamp(16px, 4vw, 40px);
  font-size: 12px;
  color: #6b7280;
}

.disclaimer {
  font-size: 12px;
  color: #6b7280;
  border-left: 3px solid var(--line);
  padding-left: 12px;
  margin: 20px 0;
}