/* ===== 拼好卷 · 数学二刷题 · 样式 ===== */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #1f2328;
  background: #f5f7fa;
  line-height: 1.5;
}
.hidden { display: none !important; }
.subtle { color: #6b7280; font-weight: normal; font-size: 0.92em; }

/* ===== 视图切换 ===== */
.view { display: none; min-height: 100vh; }
.view.active { display: flex; flex-direction: column; }

/* ===== 设置页 ===== */
.topbar {
  padding: 18px 24px;
  background: linear-gradient(135deg, #2b6cb0, #4299e1);
  color: #fff;
  display: flex;
  align-items: baseline;
  gap: 14px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}
.topbar h1 { margin: 0; font-size: 22px; }
.topbar .subtle { color: rgba(255, 255, 255, 0.85); }

.setup-body {
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
fieldset {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 16px 18px 18px;
  margin: 0;
}
legend {
  padding: 0 8px;
  font-weight: 600;
  color: #2d3748;
}

.modes {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 10px;
}
.modes label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }

/* ===== 题源分配 ===== */
.src-block { border: 1px solid #edf2f7; border-radius: 8px; padding: 10px 12px; margin-bottom: 10px; background: #fcfdff; }
.src-block:last-child { margin-bottom: 0; }
.src-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.src-name { font-weight: 600; color: #2c5282; }
.src-count input { width: 64px; padding: 4px 6px; }
.src-sub { margin-top: 8px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.src-sub input[type="number"] { width: 64px; padding: 4px 6px; }
.src-sub.dim { opacity: 0.45; }
.src-preview { margin-top: 8px; color: #4a5568; font-size: 0.92em; }

/* ===== 章节复选树 ===== */
.book-tree { display: flex; flex-direction: column; gap: 12px; max-height: 380px; overflow-y: auto; padding-right: 6px; }
.book-block { border: 1px solid #edf2f7; border-radius: 8px; padding: 10px 12px; background: #fcfdff; }
.book-head { display: flex; align-items: center; gap: 8px; }
.book-head .book-name { font-weight: 600; color: #2c5282; }
.book-head .book-meta { color: #718096; font-size: 0.85em; margin-left: auto; }
.chapter-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 4px 12px;
  padding: 8px 4px 0 24px;
}
.chapter-list label { display: flex; align-items: center; gap: 4px; font-size: 0.95em; cursor: pointer; }
.untyped-warn { font-size: 0.85em; color: #b7791f; margin-left: 8px; }

.actions-row { display: flex; gap: 8px; margin-top: 10px; }

/* ===== 倒计时 ===== */
.timer-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.timer-row input { width: 90px; padding: 6px 8px; font-size: 1.05em; }
.quick { display: flex; gap: 6px; }
.quick button { padding: 6px 14px; }

/* ===== 按钮 ===== */
button {
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
  transition: background-color 0.12s, border-color 0.12s, color 0.12s;
}
.btn-primary {
  background: #2b6cb0;
  color: #fff;
  padding: 10px 22px;
  font-size: 1.02em;
  font-weight: 600;
}
.btn-primary:hover { background: #2c5282; }
.btn-primary:disabled { background: #a0aec0; cursor: not-allowed; }
.btn-secondary {
  background: #edf2f7;
  color: #2d3748;
  padding: 8px 16px;
  border-color: #cbd5e0;
}
.btn-secondary:hover { background: #e2e8f0; }
.btn-ghost {
  background: transparent;
  color: #4a5568;
  padding: 6px 12px;
  border-color: #cbd5e0;
}
.btn-ghost:hover { background: #f1f5f9; }

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* ===== 考试页 ===== */
.exam-topbar {
  display: grid;
  grid-template-columns: auto 1fr auto auto auto;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  background: #1a202c;
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
.exam-topbar .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.3); }
.exam-topbar .btn-ghost:hover { background: rgba(255, 255, 255, 0.1); }
.exam-title { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 1.05em; overflow: hidden; }
.exam-title > span:first-child {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 50vw;
}
.exam-nav-top { color: #cbd5e0; font-size: 0.95em; }
#exam-time {
  font-variant-numeric: tabular-nums;
  font-size: 1.4em;
  font-weight: 700;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  min-width: 96px;
  text-align: center;
}
#exam-time.warn { color: #fbd38d; background: rgba(251, 191, 36, 0.12); }
#exam-time.danger { color: #fc8181; background: rgba(245, 101, 101, 0.16); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }
#exam-time.hidden { display: none; }

.exam-body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 14px;
  padding: 14px;
  min-height: 0;
}
.exam-main { min-width: 0; display: flex; flex-direction: column; gap: 12px; }
.qcard {
  background: #fff;
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.qhead { display: flex; align-items: center; gap: 12px; padding-bottom: 10px; border-bottom: 1px solid #edf2f7; }
.badge {
  font-size: 0.78em;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
  background: #ebf4ff;
  color: #2c5282;
}
.badge.choice { background: #ebf4ff; color: #2c5282; }
.badge.fill { background: #fef5e7; color: #b7791f; }
.badge.big { background: #f0fff4; color: #276749; }
.badge.mixed { background: #faf5ff; color: #6b46c1; }
.badge.mode-tag { background: #edf2f7; color: #2d3748; }

.qpane {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: #f8fafc;
  border-radius: 6px;
  margin-top: 10px;
  overflow: hidden;
}
.qpane-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  background: #fff;
  border-bottom: 1px solid #edf2f7;
  font-size: 0.92em;
}
.qpane-toolbar .btn-ghost { padding: 2px 10px; }
.qpane-spacer { flex: 1; }
.qpane-stage {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  user-select: none;
  touch-action: none;
}
.qpane-stage.dragging { cursor: grabbing; }
.qpane-stage canvas {
  display: block;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transform-origin: center center;
  transition: transform 0.05s linear;
  will-change: transform;
}
.qpane-hint {
  padding: 4px 10px;
  font-size: 0.82em;
  color: #64748b;
  background: #fff;
  border-top: 1px solid #edf2f7;
  text-align: center;
}
.pdf-loading {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: #6b7280;
}

.qanswer {
  padding: 14px 4px 4px;
  border-top: 1px solid #edf2f7;
  margin-top: 10px;
  min-height: 64px;
}
.qanswer.hidden { display: none; }
.choice-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
}
.choice-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: #f7fafc;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.12s;
}
.choice-row label:hover { border-color: #4299e1; }
.choice-row label.checked {
  background: #ebf4ff;
  border-color: #4299e1;
  color: #2c5282;
  font-weight: 600;
}
.fill-row input, .big-row textarea {
  width: 100%;
  padding: 8px 10px;
  font: inherit;
  border: 1px solid #cbd5e0;
  border-radius: 6px;
  background: #f7fafc;
}
.big-row textarea { min-height: 80px; resize: vertical; }

.qnav { display: flex; justify-content: space-between; }

.exam-side {
  background: #fff;
  border-radius: 10px;
  padding: 14px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  height: fit-content;
  position: sticky;
  top: 70px;
  transition: max-height 0.2s;
}
.exam-side h3 { margin: 0 0 10px; font-size: 1em; }
.answer-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}
.answer-grid button {
  position: relative;
  padding: 8px 0 6px;
  background: #f7fafc;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  color: #2d3748;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.answer-grid button .grid-num { font-weight: 600; }
.answer-grid button .grid-sub {
  font-size: 0.7em;
  color: #2f855a;
  font-weight: 500;
  line-height: 1;
}
.answer-grid button.answered { background: #c6f6d5; border-color: #68d391; }
.answer-grid button.current { background: #2b6cb0; color: #fff; border-color: #2b6cb0; }
.answer-grid button.current .grid-sub { color: #c6f6d5; }
.exam-side.collapsed { padding-bottom: 8px; }
.exam-side.collapsed .answer-grid { display: none; }
.side-toggle { margin-top: 10px; width: 100%; }
.qnav { display: flex; gap: 8px; margin-top: 10px; }
.qnav button { flex: 1; }

/* ===== 结果页 ===== */
.result-body {
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.result-summary {
  background: #fff;
  border-radius: 10px;
  padding: 16px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
.summary-item { display: flex; flex-direction: column; gap: 4px; }
.summary-item .num { font-size: 1.6em; font-weight: 700; color: #2b6cb0; }
.summary-item .lbl { color: #6b7280; font-size: 0.9em; }

.result-list { display: flex; flex-direction: column; gap: 8px; }
.result-row {
  background: #fff;
  border-radius: 8px;
  padding: 10px 14px;
  display: grid;
  grid-template-columns: 120px 1fr auto;
  align-items: center;
  gap: 12px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
.result-row .meta { color: #4a5568; font-size: 0.92em; }
.result-row .meta strong { color: #1f2328; }
.result-row .self-eval { display: flex; align-items: center; gap: 6px; }
.result-row .self-eval.correct { color: #276749; }
.result-row .self-eval.wrong { color: #9b2c2c; }
.result-row .self-eval textarea {
  width: 80px;
  height: 28px;
  padding: 2px 6px;
  font: inherit;
  border: 1px solid #cbd5e0;
  border-radius: 4px;
  text-align: center;
}
.result-row .toggle-btn {
  background: #edf2f7;
  border: 1px solid #cbd5e0;
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
}
.result-row .toggle-btn.on { background: #c6f6d5; border-color: #68d391; color: #276749; }
.result-row .toggle-btn.wrong { background: #fed7d7; border-color: #fc8181; color: #9b2c2c; }

/* ===== 难度标记（题源 badge 与成绩单 tag 共用） ===== */
.diff-tag, .badge.sec-jichu, .badge.sec-zonghe, .badge.sec-tuozhan, .badge.sec-none {
  font-size: .8em;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 6px;
  white-space: nowrap;
}
.sec-jichu { background: #e6fffa; color: #234e52; border: 1px solid #99e6e0; }  /* 基础 绿 */
.sec-zonghe { background: #ebf4ff; color: #2a4365; border: 1px solid #90cdf4; }  /* 综合 蓝 */
.sec-tuozhan { background: #faf5ff; color: #553c9a; border: 1px solid #d6bcfa; }  /* 拓展 紫 */
.sec-none { background: #f7fafc; color: #718096; border: 1px solid #e2e8f0; }  /* 未标 灰 */

/* ===== 弹窗 ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal-card {
  background: #fff;
  border-radius: 12px;
  padding: 24px 26px;
  max-width: 92vw;
  width: 380px;
  position: relative;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.modal-card.narrow { width: 320px; align-items: stretch; }
.modal-card h2, .modal-card h3 { margin: 0; text-align: center; }
.modal-card p { margin: 0; text-align: center; }
.modal-close {
  position: absolute;
  top: 8px; right: 12px;
  background: none;
  border: none;
  font-size: 1.6em;
  color: #a0aec0;
  cursor: pointer;
  line-height: 1;
}
.modal-close:hover { color: #4a5568; }
#pay-qr-img {
  width: 220px;
  height: auto;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
}
.pay-note { text-align: center; font-size: 0.9em; }
.pay-price { text-align: center; font-size: 1.1em; font-weight: 600; color: #1f7a3a; margin: 6px 0 0; }
#btn-paid[disabled] { background: #94a3b8; cursor: not-allowed; opacity: 0.7; }
#btn-paid[disabled]:hover { background: #94a3b8; }

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 30px; left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.82);
  color: #fff;
  padding: 10px 20px;
  border-radius: 6px;
  z-index: 200;
  font-size: 0.95em;
  animation: toast-in 0.2s ease;
}
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 10px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ===== 移动端 ===== */
@media (max-width: 760px) {
  .exam-body { grid-template-columns: 1fr; }
  .exam-side { position: static; }
  .exam-topbar { grid-template-columns: 1fr auto auto; padding: 8px 10px; }
  .exam-topbar > button:first-child { grid-column: 1; grid-row: 1; }
  .exam-topbar > .exam-title { grid-column: 2 / span 2; grid-row: 1; }
  .exam-topbar > .exam-nav-top { grid-column: 1 / span 3; grid-row: 2; }
  .exam-topbar > .exam-time-wrap { grid-column: 1; grid-row: 3; }
  .exam-topbar > .btn-primary { grid-column: 2 / span 2; grid-row: 3; justify-self: end; }
  .chapter-list { grid-template-columns: 1fr; }
}