/* 数学站（/math）样式：练习卷配置 + 卷面预览。
   卷面部分按 A4 宽度设计，屏幕上是预览，打印时和 PDF 版式接近。 */

body.math {
  --m-accent: #e07a2f;
  --m-accent-soft: #fdf1e5;
}

.math .brand { color: var(--m-accent); }

/* ---- 首页 ---- */
.math-cta {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  background: var(--m-accent-soft); border-color: var(--m-accent);
}
.math-cta h2 { margin: 0 0 4px; }
.math-cta p { margin: 0; }
.cta-btn {
  padding: 10px 22px; border-radius: 8px; font-size: 16px;
  background: var(--m-accent); color: #fff; white-space: nowrap;
}
.cta-btn:hover { text-decoration: none; opacity: .9; }

.kind-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.kind-cell {
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--paper); color: var(--ink); text-align: center;
}
.kind-cell:hover { text-decoration: none; border-color: var(--m-accent); color: var(--m-accent); }
.kind-label { font-size: 15px; }

.grade { padding: 12px 0; border-bottom: 1px dashed var(--line); }
.grade:last-child { border-bottom: 0; }
.grade-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
.grade-title { font-weight: 600; font-size: 16px; }
.grade-sub { color: var(--ink-3); font-size: 13px; }

.howto { margin: 0; padding-left: 1.3em; }
.howto li { padding: 4px 0; }

/* ---- 配置表单 ---- */
.paper-form {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px; align-items: end;
}
.paper-form .field { display: flex; flex-direction: column; gap: 4px; }
.paper-form .field.grow { grid-column: span 2; }
.paper-form label { font-size: 14px; color: var(--ink-2); }
.paper-form select, .paper-form input[type="text"] {
  padding: 8px 10px; font-size: 15px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--paper); color: var(--ink);
}
.paper-form .hint { font-size: 12px; color: var(--ink-3); }
.paper-form .actions { grid-column: 1 / -1; display: flex; gap: 10px; }

.btn, .btn-primary {
  display: inline-block; padding: 8px 18px; border-radius: 6px; font-size: 15px;
  border: 1px solid var(--m-accent); cursor: pointer;
}
.btn { background: var(--card); color: var(--m-accent); }
.btn-primary { background: var(--m-accent); color: #fff; }
.btn:hover, .btn-primary:hover { text-decoration: none; opacity: .9; }

.paper-actions {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 18px 0 10px;
}
.paper-actions .muted { font-size: 14px; }

/* ---- 卷面 ---- */
.paper-sheet {
  background: #fff; color: #1a1a1a;
  max-width: 210mm; margin: 18px auto; padding: 16mm 12mm;
  border: 1px solid var(--line); border-radius: 4px;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  font-family: "SimSun", "Songti SC", serif;
}
.paper-head { border-bottom: 1.5px solid #333; padding-bottom: 8px; margin-bottom: 14px; }
.paper-head h2 { text-align: center; font-size: 20px; margin: 0 0 8px; letter-spacing: .06em; }
.paper-meta {
  display: flex; justify-content: space-between; gap: 10px;
  font-size: 13px; color: #444; flex-wrap: wrap;
}

.paper-items {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 10px 14px; font-size: 15px; line-height: 1.6;
}
.paper-items.cols-1 { grid-template-columns: 1fr; }
.paper-items.cols-2 { grid-template-columns: repeat(2, 1fr); }
.paper-items.cols-3 { grid-template-columns: repeat(3, 1fr); }
.paper-items.cols-4 { grid-template-columns: repeat(4, 1fr); }
.paper-items li { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.paper-items.answers li { white-space: normal; }

.answer-sheet { margin-top: 24px; }
.answer-sheet h3 { margin: 0 0 12px; font-size: 17px; }

/* ---- 打印 ---- */
@media print {
  body.math { background: #fff; }
  .site-header, .site-footer, .page-title, .page-sub,
  .paper-form, .paper-actions, .answer-sheet { display: none; }
  main.container { padding: 0; max-width: none; }
  .paper-sheet {
    border: 0; box-shadow: none; margin: 0; padding: 0;
    max-width: none; page-break-after: always;
  }
  .paper-items { font-size: 14px; }
}

@media (max-width: 720px) {
  .paper-sheet { padding: 8mm 5mm; }
  .paper-items.cols-3, .paper-items.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .paper-form .field.grow { grid-column: 1 / -1; }
}