/* 题目详情页：伪静态 /q/{id}.html */
.qd-page { max-width: 1200px; padding-top: 16px; padding-bottom: 48px; }
.qd-layout { display: grid; grid-template-columns: 1fr 320px; gap: 32px; align-items: start; }

/* ── 主内容卡 ── */
.qd-card { padding: 28px 32px; }
.qd-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.qd-tags .tag { padding: 4px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.tag-subject { background: var(--primary-light); color: var(--primary); }
.tag-grade { background: #FEF3C7; color: #B45309; }
.tag-type { background: #EDE9FE; color: #6D28D9; }
.tag-premium { background: #FEF9C3; color: #A16207; border: 1px solid #FDE68A; }
.tag-diff.diff-1, .tag-diff.diff-2 { background: #DCFCE7; color: #15803D; }
.tag-diff.diff-3 { background: var(--primary-light); color: var(--primary); }
.tag-diff.diff-4, .tag-diff.diff-5 { background: #FEE2E2; color: #B91C1C; }

.qd-title { font-size: 22px; font-weight: 700; color: var(--text); margin: 0 0 8px; line-height: 1.4; }
.qd-meta { display: flex; gap: 18px; flex-wrap: wrap; font-size: 13px; color: var(--text-sub); margin: 0 0 20px; }
.qd-meta i { margin-right: 4px; }

.qd-body { border-top: 1px solid var(--border); padding-top: 20px; }
.qd-label { font-size: 14px; font-weight: 700; color: var(--text); margin: 16px 0 8px; display: flex; align-items: center; gap: 6px; }
.qd-label i { color: var(--primary); font-size: 17px; }
.qd-ans-label i { color: var(--success); }

.qd-stem { font-size: 15.5px; line-height: 1.8; color: var(--text); background: #F8FAFD; padding: 18px 20px; border-radius: 12px; border: 1px solid #E2E8F0; white-space: pre-wrap; }

.qd-answer { display: flex; align-items: center; gap: 12px; background: #F0FDF4; border: 1px solid #BBF7D0; padding: 14px 18px; border-radius: 12px; }
.qd-answer-text { flex: 1; font-size: 15px; font-weight: 600; color: #15803D; }
.btn-copy { display: inline-flex; align-items: center; gap: 4px; padding: 6px 14px; border: 1px solid var(--border); border-radius: 8px; background: #fff; font-size: 12.5px; color: var(--text-sub); cursor: pointer; transition: all .15s ease; white-space: nowrap; }
.btn-copy:hover { border-color: var(--primary); color: var(--primary); }

.qd-analysis { margin-top: 16px; }
.qd-analysis summary { cursor: pointer; font-size: 14px; font-weight: 700; color: var(--text); padding: 12px 16px; background: #FFFBEB; border: 1px solid #FDE68A; border-radius: 10px; display: flex; align-items: center; gap: 6px; list-style: none; }
.qd-analysis summary::-webkit-details-marker { display: none; }
.qd-analysis summary i { color: #B45309; font-size: 16px; }
.qd-analysis-body { padding: 14px 18px; font-size: 14.5px; line-height: 1.75; color: var(--text); background: #FFFEF5; border: 1px solid #FDE68A; border-top: none; border-radius: 0 0 10px 10-radius; border-radius: 0 0 10px 10px; }

.qd-login-hint { display: flex; align-items: center; gap: 8px; padding: 16px 20px; background: #F8FAFD; border: 1px dashed var(--border); border-radius: 12px; font-size: 14px; }
.qd-login-hint a { color: var(--primary); font-weight: 600; }

.qd-actions { display: flex; gap: 12px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }

/* ── 相关题 ── */
.qd-related { margin-top: 28px; }
.qd-related h3 { font-size: 17px; font-weight: 700; display: flex; align-items: center; gap: 6px; margin: 0 0 14px; }
.qd-related h3 i { color: var(--primary); }
.qd-rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.qd-rel-card { padding: 16px 18px; text-decoration: none; transition: all .15s ease; border: 1px solid var(--border); }
.qd-rel-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(37,99,235,.08); }
.qd-rel-tags { display: flex; gap: 6px; margin-bottom: 8px; }
.tag-sm { padding: 2px 8px; border-radius: 999px; font-size: 11px; background: var(--primary-light); color: var(--primary); font-weight: 600; }
.qd-rel-stem { font-size: 13.5px; line-height: 1.5; color: var(--text); margin: 0 0 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.qd-rel-point { font-size: 12px; color: var(--text-sub); display: flex; align-items: center; gap: 4px; }
.qd-rel-point i { font-size: 13px; }

/* ── 侧栏 ── */
.qd-side { position: sticky; top: 80px; }
.qd-side-card { padding: 18px 20px; margin-bottom: 16px; }
.qd-side-card h4 { font-size: 15px; font-weight: 700; display: flex; align-items: center; gap: 6px; margin: 0 0 12px; }
.qd-side-card h4 i { color: var(--primary); }
.qd-info-list { display: grid; grid-template-columns: auto 1fr; gap: 8px 14px; font-size: 13.5px; }
.qd-info-list dt { color: var(--text-sub); font-weight: 500; }
.qd-info-list dd { color: var(--text); margin: 0; font-weight: 500; }
.qd-side-cta p { font-size: 13px; color: var(--text-sub); margin: 0 0 12px; }
.btn-block { display: block; width: 100%; text-align: center; }

/* KaTeX 公式排版修复 */
.qd-stem .katex-display, .qd-answer-text .katex-display, .qd-analysis-body .katex-display {
  overflow-x: auto; overflow-y: hidden; padding: 4px 0;
}

/* ── 响应式 ── */
@media (max-width: 992px) {
  .qd-layout { grid-template-columns: 1fr; }
  .qd-side { position: static; }
  .qd-card { padding: 20px 16px; }
  .qd-title { font-size: 19px; }
  .qd-actions { flex-direction: column; }
  .qd-rel-grid { grid-template-columns: 1fr; }
}

/* ── 题库分页条（伪静态链接） ── */
.bank-pager { display: flex; align-items: center; gap: 8px; justify-content: center; margin-top: 28px; }
.bank-pager a { padding: 8px 16px; border-radius: 8px; border: 1px solid var(--border); font-size: 14px; color: var(--text); text-decoration: none; transition: all .15s ease; background: #fff; }
.bank-pager a:hover { border-color: var(--primary); color: var(--primary); }
.bank-pager a.on { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.bank-pager a.off { opacity: .4; pointer-events: none; }
.bank-pager .page-info { font-size: 13px; color: var(--text-sub); margin: 0 8px; }