/* 口算生成器：表单区 + A4 打印版式 */
.ks-page { max-width: 860px; padding-top: 22px; padding-bottom: 40px; }
.ks-form h1 { font-size: 22px; margin: 0 0 6px; }
.ks-form .hero-sub { margin: 0 0 2px; }
.ks-actions { display: flex; gap: 10px; align-items: flex-end; }

.ks-sheet { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 26px 30px; margin-top: 18px; }
.ks-sheet-head h2 { font-size: 17px; margin: 0; text-align: center; }
.ks-sheet-head p { text-align: center; font-size: 12.5px; color: var(--text-sub); margin: 6px 0 4px; }
.ks-list { list-style: none; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px 18px; counter-reset: ks; }
.ks-list li { display: flex; align-items: baseline; gap: 4px; counter-increment: ks; font-size: 15px; }
.ks-list li::before { content: counter(ks) "."; color: var(--text-sub); min-width: 24px; }
.ks-list li span { white-space: nowrap; }
.ks-list li i { flex: 1; border-bottom: 1px solid #CBD5E1; min-width: 24px; align-self: flex-end; margin-bottom: 3px; }
.ks-list-ans li i { display: none; }
.ks-sheet-foot { text-align: center; font-size: 11px; color: var(--text-sub); margin-top: 18px; }

@media (max-width: 768px) {
  .ks-list { grid-template-columns: repeat(2, 1fr); }
  .ks-sheet { padding: 18px 14px; }
}

/* 打印：仅试卷版（答案页手动选择打印） */
@media print {
  .no-print, .site-header, .m-tabbar, .site-footer, .ks-answers, .task-panel { display: none !important; }
  .ks-page { max-width: none; padding: 0; }
  .ks-sheet { border: none; margin: 0; padding: 0; }
  body { padding-bottom: 0 !important; }
  .ks-list { grid-template-columns: repeat(4, 1fr); }
}

/* ===== 参数条件区：下拉紧凑网格 + 运算符 chips 一行 ===== */
.ks-ctl { margin-top: 12px; }
.ks-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px;
}
.ks-field { display: flex; align-items: center; gap: 8px; }
.ks-field > span { font-size: 13px; color: var(--text-sub); flex-shrink: 0; }
.ks-field select {
  flex: 1; min-width: 0; min-height: 38px;
  padding: 7px 30px 7px 12px;
  border: 1px solid var(--border); border-radius: 8px; background: #fff;
  font-size: 13.5px; color: var(--text); cursor: pointer;
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%2364748B' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 11px center;
  transition: border-color .14s ease;
}
.ks-field select:focus { outline: none; border-color: var(--primary); }
.ks-field select:hover { border-color: #B9C6DB; }

/* 运算符多选 chips 一行（白底胶囊，选中蓝底投影） */
.ks-field-op { margin-top: 10px; }
.ks-chips { display: inline-flex; gap: 7px; flex-wrap: wrap; }
.ks-chips a {
  padding: 6px 14px; min-height: 34px; min-width: 46px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: 999px;
  background: #fff; font-size: 15px; font-weight: 600; color: var(--text);
  text-decoration: none; line-height: 1; cursor: pointer;
  transition: all .14s ease;
  -webkit-user-select: none; user-select: none;
}
.ks-chips a:hover { border-color: var(--primary); color: var(--primary); }
.ks-chips a:active { transform: scale(.94); }
.ks-chips a.on {
  background: var(--primary); border-color: var(--primary); color: #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, .28);
}

.ks-btns { display: flex; gap: 10px; margin-top: 14px; justify-content: flex-end; }
.ks-btns .btn { min-width: 132px; }

@media (max-width: 768px) {
  .ks-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .ks-field > span { min-width: 34px; }
  .ks-field select { width: 100%; }
  /* 按钮不变形：等宽三列，文字可省略图标保字号 */
  .ks-btns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .ks-btns .btn { min-width: 0; padding-left: 6px; padding-right: 6px; white-space: nowrap; font-size: 13.5px; }
}

@media (max-width: 768px) {
  .ks-line { padding: 10px 12px; gap: 10px; }
  .ks-label { min-width: 100%; }             /* 移动端标签独占一行，chips 换行铺开 */
  .ks-btns .btn { flex: 1; min-width: 0; }
}

/* 在线答题面板 */
.ks-answer-mode { max-width: 640px; margin-left: auto; margin-right: auto; }
.ks-ans-head { display: flex; gap: 18px; font-size: 13.5px; color: var(--text-sub); padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.ks-ans-q { font-size: 34px; font-weight: 700; text-align: center; padding: 34px 0 26px; letter-spacing: 2px; }
.ks-ans-row { display: flex; gap: 10px; }
#ks-input { flex: 1; font-size: 20px; padding: 12px 16px; border: 2px solid var(--border); border-radius: 10px; text-align: center; }
#ks-input:focus { outline: none; border-color: var(--primary); }
.ks-ans-done h3 { text-align: center; font-size: 18px; }
.ks-ans-again { display: flex; gap: 10px; justify-content: center; margin-top: 14px; }
.ks-records { margin-top: 16px; font-size: 13px; }
.ks-records summary { cursor: pointer; color: var(--text-sub); }
.ks-records ul { list-style: none; padding: 8px 0 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.ks-records li { display: flex; justify-content: space-between; gap: 10px; border-bottom: 1px dashed var(--border); padding-bottom: 5px; }

/* 答题模式隐藏打印区（避免同屏混乱） */
@media print {
  .ks-answer-mode { display: none !important; }
}