:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f5f7fb;
  --card: #ffffff;
  --border: #dbe2ea;
  --text: #1f2937;
  --muted: #6b7280;
  --danger: #dc2626;
  --success: #16a34a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 { font-size: 18px; margin: 0; }
header nav a { margin-left: 16px; color: var(--primary); text-decoration: none; font-size: 14px; }
main { max-width: 900px; margin: 24px auto; padding: 0 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
h2 { font-size: 16px; margin-top: 0; }
label { display: block; font-size: 14px; margin-bottom: 6px; color: var(--muted); }
select, input[type="text"], input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  margin-bottom: 14px;
}
button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
}
button:hover { background: var(--primary-dark); }
button.secondary { background: #6b7280; }
button.danger { background: var(--danger); }
button:disabled { background: #9ca3af; cursor: not-allowed; }

.checkbox-row { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
.checkbox-row input { width: auto; margin: 0; }
.checkbox-row label { margin: 0; color: var(--text); font-size: 14px; }

.answer-boxes { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.answer-boxes .block-group {
  display: flex;
  gap: 3px;
  padding: 4px;
  border: 1px dashed var(--border);
  border-radius: 6px;
}
.answer-boxes input.box {
  width: 32px;
  height: 36px;
  text-align: center;
  font-size: 16px;
  padding: 0;
  margin: 0;
  text-transform: lowercase;
}
.block-label { font-size: 11px; color: var(--muted); width: 100%; margin-bottom: 2px; }

.result-summary { font-size: 22px; font-weight: bold; margin-bottom: 10px; }
.result-summary .score { color: var(--primary); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
tr.correct td.judge { color: var(--success); }
tr.incorrect td.judge { color: var(--danger); }

.exam-block { border: 1px solid var(--border); border-radius: 8px; padding: 14px; margin-bottom: 16px; }
.subject-block { border: 1px solid var(--border); border-radius: 8px; padding: 12px; margin: 10px 0; background: #fafbfc; }
.answer-row { display: flex; gap: 8px; align-items: center; margin-bottom: 6px; flex-wrap: wrap; }
.answer-row input[type=text] { width: 140px; margin: 0; }
.answer-row input[type=number] { width: 90px; margin: 0; }
.small-btn { padding: 4px 10px; font-size: 12px; }
.muted { color: var(--muted); font-size: 13px; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; background: #eef2ff; color: var(--primary); font-size: 12px; }
#clerk-signin { display: flex; justify-content: center; margin-top: 60px; }
.hidden { display: none !important; }