/* ============================================================
 * components.css —— 卡片 / 按钮 / 表单 / 表格 / 标签树 /
 *                  题目卡片 / 图表容器 / 弹层 / 状态
 * ============================================================ */

/* ---------------- 卡片 ---------------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s, border-color .2s;
}
.card.hoverable:hover { box-shadow: var(--shadow); transform: translateY(-2px); border-color: var(--blue-200); }
.card.flat { box-shadow: none; }
.card-tint { background: linear-gradient(160deg, var(--blue-50), #fff 62%); }
.card-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 14px; flex-wrap: wrap;
}
.card-title { font-size: 1.06em; font-weight: 800; color: var(--ink); margin: 0; display: flex; align-items: center; gap: 8px; }
.card-sub { color: var(--muted); font-size: .88em; margin: 2px 0 0; }
.card.pad-sm { padding: 16px; border-radius: var(--r-md); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 10px 20px;
  border-radius: var(--r-full);
  border: 1.5px solid transparent;
  font-weight: 700;
  font-size: .95em;
  line-height: 1.3;
  transition: transform .14s, box-shadow .18s, background .18s, color .18s, border-color .18s;
  white-space: nowrap;
  user-select: none;
}
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; }
.btn-primary { background: linear-gradient(135deg, var(--blue-500), var(--blue-600)); color: #fff; box-shadow: 0 6px 18px rgba(37, 99, 235, .3); }
.btn-primary:hover { box-shadow: 0 10px 26px rgba(37, 99, 235, .4); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--ink-2); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--blue-300); color: var(--blue-700); background: var(--blue-50); }
.btn-success { background: linear-gradient(135deg, var(--green-500), var(--green-600)); color: #fff; box-shadow: 0 6px 18px rgba(22, 163, 74, .28); }
.btn-danger { background: #fff; color: var(--red-600); border-color: #fecaca; }
.btn-danger:hover { background: var(--red-100); }
.btn-warm { background: linear-gradient(135deg, #fbbf24, var(--amber-500)); color: #7c2d12; box-shadow: 0 6px 18px rgba(245, 158, 11, .3); }
.btn-sm { padding: 7px 14px; font-size: .88em; }
.btn-lg { padding: 13px 28px; font-size: 1.02em; }
.btn-block { width: 100%; }
.btn-icon {
  width: 38px; height: 38px; display: inline-grid; place-items: center;
  border-radius: var(--r-full);
  border: 1.5px solid var(--line);
  background: #fff;
  color: var(--ink-3);
  font-size: 1.02em;
  transition: all .16s;
}
.btn-icon:hover { border-color: var(--blue-300); color: var(--blue-600); background: var(--blue-50); }
.btn-icon.on, .btn-icon.active { background: var(--blue-500); border-color: var(--blue-500); color: #fff; }
.btn-group { display: inline-flex; gap: 8px; flex-wrap: wrap; }

/* ---------------- 徽章 / 标签 ---------------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 11px;
  border-radius: var(--r-full);
  font-size: .8em;
  font-weight: 700;
  background: var(--blue-50);
  color: var(--blue-700);
  border: 1px solid var(--blue-100);
  white-space: nowrap;
}
.badge-type { background: #eef2ff; color: #4338ca; border-color: #e0e7ff; }
.badge-manual { background: var(--amber-100); color: #92400e; border-color: #fde68a; }
.badge-pt { background: color-mix(in srgb, var(--c, #64748b) 12%, #fff); color: var(--c, #475569); border-color: color-mix(in srgb, var(--c, #64748b) 26%, #fff); }
.badge-diff-1 { background: var(--green-100); color: var(--green-700); border-color: #bbf7d0; }
.badge-diff-2 { background: var(--amber-100); color: #92400e; border-color: #fde68a; }
.badge-diff-3 { background: var(--red-100); color: #991b1b; border-color: #fecaca; }
.badge-solid { background: var(--blue-500); color: #fff; border-color: var(--blue-500); }

.tag {
  display: inline-flex; align-items: center;
  padding: 2px 10px;
  border-radius: var(--r-full);
  font-size: .78em;
  background: var(--bg-2);
  color: var(--ink-3);
  border: 1px solid var(--line);
  white-space: nowrap;
}
.tag-0 { background: var(--blue-50); color: var(--blue-700); border-color: var(--blue-100); }
.tag-1 { background: var(--green-100); color: var(--green-700); border-color: #bbf7d0; }
.tag-2 { background: var(--amber-100); color: #92400e; border-color: #fde68a; }
.tag-3 { background: var(--purple-100); color: #6b21a8; border-color: #e9d5ff; }
.chip {
  display: inline-flex; align-items: center; padding: 4px 12px;
  border-radius: var(--r-full); font-size: .84em; font-weight: 700;
  background: var(--blue-50); color: var(--blue-700); border: 1px solid var(--blue-100);
}
.chip-0 { background: var(--blue-50); color: var(--blue-700); border-color: var(--blue-100); }
.chip-1 { background: var(--green-100); color: var(--green-700); border-color: #bbf7d0; }
.chip-2 { background: var(--amber-100); color: #92400e; border-color: #fde68a; }
.chip-3 { background: var(--pink-100); color: #9d174d; border-color: #fbcfe8; }

/* ---------------- 表单 ---------------- */
.field { margin-bottom: 14px; }
.field > label, .label {
  display: block; font-weight: 700; font-size: .88em;
  color: var(--ink-3); margin-bottom: 6px;
}
.input, .select, .textarea,
input[type="text"], input[type="number"], select, textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--r-sm);
  background: #fff;
  color: var(--ink-2);
  transition: border-color .16s, box-shadow .16s;
  outline: none;
}
input[type="text"]:focus, input[type="number"]:focus, select:focus, textarea:focus, .input:focus, .select:focus, .textarea:focus {
  border-color: var(--blue-400);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, .14);
}
.input.is-ok { border-color: var(--green-500); box-shadow: 0 0 0 4px rgba(34, 197, 94, .14); }
.input.is-err { border-color: var(--red-500); box-shadow: 0 0 0 4px rgba(239, 68, 68, .13); }
textarea { resize: vertical; min-height: 76px; line-height: 1.7; }
.select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, #94a3b8 50%), linear-gradient(135deg, #94a3b8 50%, transparent 50%); background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 34px; }
.hint { color: var(--muted); font-size: .84em; margin: 6px 0 0; }

.switch-row {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 11px 0; border-bottom: 1px dashed var(--line-2);
  font-weight: 600; color: var(--ink-3); font-size: .94em;
  cursor: pointer;
}
.switch-row input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--blue-500); flex: 0 0 auto; cursor: pointer; }

.check-list { display: flex; flex-wrap: wrap; gap: 8px; }
.check-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: var(--r-full);
  border: 1.5px solid var(--line); background: #fff;
  font-size: .88em; font-weight: 600; color: var(--ink-3);
  cursor: pointer; transition: all .15s; user-select: none;
}
.check-pill:hover { border-color: var(--blue-300); color: var(--blue-700); }
.check-pill input { display: none; }
.check-pill.on { background: var(--blue-50); border-color: var(--blue-400); color: var(--blue-700); box-shadow: 0 2px 10px rgba(59, 130, 246, .16); }

.btn-seg { display: inline-flex; background: var(--bg-2); border-radius: var(--r-full); padding: 4px; gap: 3px; }
.btn-seg button {
  border: 0; background: transparent; border-radius: var(--r-full);
  padding: 7px 16px; font-weight: 700; font-size: .88em; color: var(--ink-3);
  transition: all .16s;
}
.btn-seg button.on { background: #fff; color: var(--blue-700); box-shadow: var(--shadow-sm); }

/* ---------------- 表格 ---------------- */
.data-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: .92em; }
.data-table th, .data-table td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--line-2); }
.data-table th { background: var(--bg-2); color: var(--ink-3); font-weight: 700; font-size: .9em; }
.data-table th:first-child { border-radius: var(--r-sm) 0 0 0; }
.data-table th:last-child { border-radius: 0 var(--r-sm) 0 0; }
.data-table tbody tr:hover { background: var(--blue-50); }
.data-table td.num { font-family: var(--font-num); }

/* ---------------- 统计卡片 ---------------- */
.stat-card {
  position: relative; overflow: hidden;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}
.stat-card .stat-ico {
  position: absolute; right: 14px; top: 12px; font-size: 2.1em; opacity: .16;
}
.stat-card .stat-label { color: var(--muted); font-size: .86em; font-weight: 600; }
.stat-card .stat-value { font-size: 1.86em; font-weight: 800; color: var(--ink); line-height: 1.24; letter-spacing: -.02em; }
.stat-card .stat-value small { font-size: .5em; font-weight: 700; color: var(--muted); margin-left: 4px; }
.stat-card .stat-foot { color: var(--muted); font-size: .82em; margin-top: 3px; }
.stat-card.accent { background: linear-gradient(150deg, var(--blue-500), #0ea5e9); border-color: transparent; color: #fff; }
.stat-card.accent .stat-label, .stat-card.accent .stat-foot { color: rgba(255, 255, 255, .86); }
.stat-card.accent .stat-value { color: #fff; }
.stat-card.accent .stat-value small { color: rgba(255, 255, 255, .8); }

/* ---------------- 进度条 / 圆环 ---------------- */
.bar { height: 10px; border-radius: 999px; background: var(--bg-2); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--blue-500), #22d3ee); transition: width .5s; }
.bar.green > i { background: linear-gradient(90deg, var(--green-500), #86efac); }
.bar.amber > i { background: linear-gradient(90deg, var(--amber-500), #fcd34d); }
.bar.red > i { background: linear-gradient(90deg, var(--red-500), #fca5a5); }

.ring { position: relative; width: 132px; height: 132px; }
.ring svg { transform: rotate(-90deg); }
.ring .ring-bg { fill: none; stroke: var(--bg-2); stroke-width: 12; }
.ring .ring-fg { fill: none; stroke: url(#ringGrad); stroke-width: 12; stroke-linecap: round; transition: stroke-dashoffset .8s ease; }
.ring .ring-text {
  position: absolute; inset: 0; display: grid; place-items: center; text-align: center; line-height: 1.2;
}
.ring .ring-text b { font-size: 1.72em; color: var(--ink); display: block; }
.ring .ring-text span { font-size: .78em; color: var(--muted); }

/* ---------------- 标签树 ---------------- */
.tree { font-size: .93em; }
.tree-toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 10px; flex-wrap: wrap; }
.tree-body { max-height: 560px; overflow: auto; padding-right: 6px; }
.tree-group { margin-bottom: 4px; }
.tree-node {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px; border-radius: var(--r-xs);
  cursor: pointer; user-select: none;
  transition: background .14s;
  border: 1px solid transparent;
}
.tree-node:hover { background: var(--blue-50); }
.tree-node.sel { background: var(--blue-50); border-color: var(--blue-200); }
.tree-node .tw {
  width: 18px; height: 18px; flex: 0 0 auto;
  display: grid; place-items: center;
  font-size: .78em; color: var(--muted);
  transition: transform .18s;
}
.tree-node.open .tw { transform: rotate(90deg); }
.tree-node .tname { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-node .tcount { font-size: .78em; color: var(--muted-2); font-family: var(--font-num); }
.tree-node.lv-book { font-weight: 800; color: var(--ink); }
.tree-node.lv-know { font-weight: 600; color: var(--ink-3); padding-left: 22px; }
.tree-node.lv-point { padding-left: 44px; font-weight: 500; color: var(--ink-3); font-size: .95em; }
.tree-node.lv-point .badge { transform: scale(.86); transform-origin: right center; }
.tree-children { display: none; }
.tree-children.open { display: block; animation: mx-fade-up .18s ease; }
.tree-node .tcheck { flex: 0 0 auto; width: 17px; height: 17px; accent-color: var(--blue-500); }

/* ---------------- 题目卡片 ---------------- */
.q-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 20px 22px 16px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 18px;
  animation: mx-fade-up .22s ease;
}
.q-card.big-font { font-size: 1.14em; }
.q-card.locked { background: var(--card-2); }
.q-card.graded.correct { border-color: #bbf7d0; box-shadow: 0 0 0 3px rgba(34, 197, 94, .1); }
.q-card.graded.wrong { border-color: #fecaca; box-shadow: 0 0 0 3px rgba(239, 68, 68, .1); }
.q-card.graded.manual { border-color: #fde68a; box-shadow: 0 0 0 3px rgba(245, 158, 11, .1); }
.q-card.flagged::before {
  content: ''; position: absolute; left: 0; top: 18px; bottom: 18px; width: 4px;
  border-radius: 4px; background: var(--amber-500);
}
.q-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.q-index {
  width: 30px; height: 30px; border-radius: 50%;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
  color: #fff; font-weight: 800; font-size: .9em;
  box-shadow: 0 4px 12px rgba(37, 99, 235, .3);
  flex: 0 0 auto;
}
.q-diff { color: var(--amber-500); font-size: .92em; letter-spacing: 1px; }
.q-score { font-size: .84em; color: var(--muted); font-weight: 700; }
.q-head-spacer { flex: 1 1 auto; }
.q-flag { width: 32px; height: 32px; font-size: .92em; }
.q-flag.active { background: var(--amber-500); border-color: var(--amber-500); color: #fff; }
.q-result { margin-left: auto; font-weight: 800; font-size: .84em; padding: 3px 12px; border-radius: var(--r-full); }
.q-result.correct { background: var(--green-100); color: var(--green-700); }
.q-result.wrong { background: var(--red-100); color: #991b1b; }
.q-result.manual { background: var(--amber-100); color: #92400e; }

.q-stem { font-size: 1.04em; color: var(--ink); line-height: 1.85; margin-bottom: 12px; }
.q-stem .katex { font-size: 1.1em; }
.q-tags-row { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.q-media { margin: 10px 0 16px; display: flex; justify-content: center; }
.media {
  background: linear-gradient(180deg, #fbfdff, #f6faff);
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  padding: 14px;
  max-width: 100%;
  overflow: auto;
}
.media svg { display: block; margin: 0 auto; }
.media-caption { text-align: center; color: var(--muted); font-size: .86em; margin-top: 8px; }
.media-interactive-canvas { position: relative; }
.media-unknown { color: var(--muted); font-size: .88em; }

.q-body { margin-top: 6px; }

/* 选项 */
.opts { display: grid; gap: 10px; }
.opts-multi { gap: 8px; }
.opt {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 16px;
  border: 1.5px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  cursor: pointer;
  transition: all .16s;
}
.opt:hover { border-color: var(--blue-300); background: var(--blue-50); }
.opt input { position: absolute; opacity: 0; pointer-events: none; }
.opt-mark {
  width: 28px; height: 28px; flex: 0 0 auto;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--bg-2); color: var(--ink-3);
  font-weight: 800; font-size: .86em;
  transition: all .16s;
}
.opt-text { flex: 1 1 auto; min-width: 0; padding-top: 2px; }
.opt.picked { border-color: var(--blue-500); background: var(--blue-50); box-shadow: 0 4px 14px rgba(59, 130, 246, .16); }
.opt.picked .opt-mark { background: var(--blue-500); color: #fff; }
.q-card.locked .opt { cursor: default; }

/* 判断题 */
.judge-opts { display: flex; gap: 14px; flex-wrap: wrap; }
.judge-btn {
  flex: 1 1 150px;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 16px 18px;
  border: 1.5px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
  transition: all .16s;
}
.judge-btn span { font-size: 1.8em; line-height: 1.1; }
.judge-btn em { font-style: normal; font-size: .84em; color: var(--muted); font-weight: 700; }
.judge-correct span { color: var(--green-600); }
.judge-wrong span { color: var(--red-500); }
.judge-btn:hover { border-color: var(--blue-300); transform: translateY(-1px); }
.judge-btn.picked { border-color: var(--blue-500); background: var(--blue-50); box-shadow: 0 6px 18px rgba(59, 130, 246, .18); }

/* 填空 */
.blanks { display: grid; gap: 10px; }
.blanks.inline { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.blank-row { display: flex; align-items: center; gap: 10px; }
.blank-label { font-size: .86em; color: var(--muted); font-weight: 700; white-space: nowrap; }
.blank-input {
  flex: 1 1 auto; min-width: 90px;
  padding: 10px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--r-sm);
  background: #fff;
  font-size: 1.02em;
  font-family: var(--font-num);
  outline: none;
  transition: all .16s;
}
.blank-input:focus { border-color: var(--blue-400); box-shadow: 0 0 0 4px rgba(59, 130, 246, .14); }
.blank-input.blank-correct, .blank-input.is-ok { border-color: var(--green-500); background: var(--green-100); }
.blank-input.blank-wrong, .blank-input.is-err { border-color: var(--red-500); background: var(--red-100); }
.blank-unit { color: var(--muted); font-size: .9em; white-space: nowrap; }

/* 阅读理解 */
.reading-sub {
  border: 1px dashed var(--line);
  border-radius: var(--r-md);
  padding: 12px 14px;
  margin-bottom: 10px;
  background: var(--card-2);
}
.reading-line { display: flex; gap: 10px; margin-bottom: 8px; align-items: baseline; }
.reading-label { font-weight: 800; color: var(--blue-600); flex: 0 0 auto; }
.reading-text { flex: 1 1 auto; }
.reading-sub.blank-correct { border-color: var(--green-500); background: var(--green-100); }
.reading-sub.blank-wrong { border-color: var(--red-400); background: var(--red-100); }

/* 交互图形题 */
.region-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; min-height: 30px; align-items: center; }

/* 作图题 */
.draw-wrap { border: 1px solid var(--line); border-radius: var(--r-md); padding: 12px; background: var(--card-2); }
.draw-toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.draw-tools { display: inline-flex; gap: 4px; }
.draw-tools .btn-icon { width: 32px; height: 32px; font-size: 1em; }
.draw-width { display: inline-flex; align-items: center; gap: 8px; font-size: .84em; color: var(--muted); }
.draw-width input { width: 96px; accent-color: var(--blue-500); }
.draw-canvas-box {
  position: relative; border: 2px dashed var(--blue-200); border-radius: var(--r-md);
  background:
    linear-gradient(90deg, rgba(59,130,246,.07) 1px, transparent 1px) 0 0/28px 28px,
    linear-gradient(0deg, rgba(59,130,246,.07) 1px, transparent 1px) 0 0/28px 28px,
    #fff;
  overflow: hidden;
}
.draw-canvas { display: block; touch-action: none; cursor: crosshair; }
.draw-hint { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted-2); font-size: .92em; pointer-events: none; }
.draw-note-label { display: block; font-size: .84em; color: var(--muted); font-weight: 700; margin: 10px 0 4px; }

/* 解析 */
.q-analysis {
  margin-top: 14px; padding: 14px 16px;
  background: linear-gradient(160deg, #f0fdf4, #f8fffb);
  border: 1px solid #bbf7d0;
  border-radius: var(--r-md);
  animation: mx-pop .2s ease;
}
.analysis-title { font-weight: 800; color: var(--green-700); margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.analysis-title::before { content: '💡'; }
.analysis-answer { margin-bottom: 8px; font-size: .96em; }
.analysis-answer .label { color: var(--muted); font-weight: 700; }
.analysis-answer .value { color: var(--green-700); font-weight: 800; }
.analysis-body { color: var(--ink-3); font-size: .95em; line-height: 1.9; }
.q-toggle-analysis { margin-top: 12px; }

/* ---------------- 图表 ---------------- */
.chart { width: 100%; min-height: 240px; }
.chart-tall { min-height: 320px; }
.chart-fallback { padding: 12px; background: var(--amber-100); border-radius: var(--r-md); }

/* ---------------- 弹层 / 抽屉 / 提示 ---------------- */
.modal-mask, .drawer-mask {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(15, 23, 42, .42);
  backdrop-filter: blur(3px);
  display: grid; place-items: center;
  opacity: 0; transition: opacity .2s;
}
.modal-mask.in, .drawer-mask.in { opacity: 1; }
.modal {
  width: min(560px, calc(100vw - 32px));
  background: #fff; border-radius: var(--r-xl);
  padding: 24px; box-shadow: var(--shadow-lg);
  transform: translateY(10px); transition: transform .2s;
}
.modal-mask.in .modal { transform: none; }
.modal-title { margin-bottom: 10px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

.drawer-mask { place-items: stretch end; }
.drawer {
  width: min(420px, 100vw); height: 100%;
  background: #fff; box-shadow: -12px 0 40px rgba(15, 23, 42, .16);
  display: flex; flex-direction: column;
  transform: translateX(16px); transition: transform .24s;
}
.drawer-mask.in .drawer { transform: none; }
.drawer-head { display: flex; align-items: center; justify-content: space-between; padding: 18px 22px; border-bottom: 1px solid var(--line); }
.drawer-head h3 { margin: 0; }
.drawer-body { padding: 18px 22px 40px; overflow: auto; }
.drawer-sub { margin: 6px 0 10px; color: var(--ink-3); }
.drawer-btns { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }

.toast-root {
  position: fixed; z-index: 300; top: 18px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; gap: 8px; align-items: center;
  pointer-events: none;
}
.toast {
  display: flex; align-items: center; gap: 9px;
  padding: 11px 20px; border-radius: var(--r-full);
  background: #fff; box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
  font-weight: 700; font-size: .92em;
  opacity: 0; transform: translateY(-10px); transition: all .24s;
  max-width: min(88vw, 560px);
}
.toast.in { opacity: 1; transform: none; }
.toast-ico { width: 20px; height: 20px; display: grid; place-items: center; border-radius: 50%; font-size: .8em; color: #fff; flex: 0 0 auto; }
.toast-info .toast-ico { background: var(--blue-500); }
.toast-ok .toast-ico { background: var(--green-500); }
.toast-warn .toast-ico { background: var(--amber-500); }
.toast-err .toast-ico { background: var(--red-500); }

/* ---------------- 状态：空 / 加载 ---------------- */
.empty { text-align: center; padding: 52px 22px; color: var(--muted); }
.empty-ico { font-size: 3.2em; margin-bottom: 10px; opacity: .6; }
.empty h3 { color: var(--ink-3); margin-bottom: 6px; }

.loading-mask {
  position: fixed; inset: 0; z-index: 400;
  background: rgba(255, 255, 255, .74);
  backdrop-filter: blur(2px);
  display: grid; place-items: center;
}
.loading-box {
  display: flex; align-items: center; gap: 12px;
  background: #fff; padding: 16px 26px; border-radius: var(--r-full);
  box-shadow: var(--shadow-lg); font-weight: 700; color: var(--ink-3);
}
.spinner {
  width: 20px; height: 20px; border-radius: 50%;
  border: 3px solid var(--blue-100); border-top-color: var(--blue-500);
  animation: mx-spin .8s linear infinite;
}

/* ---------------- 时间线 ---------------- */
.timeline { position: relative; padding-left: 22px; }
.timeline::before { content: ''; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: var(--line); border-radius: 2px; }
.tl-item { position: relative; padding: 0 0 16px 6px; }
.tl-item::before {
  content: ''; position: absolute; left: -20px; top: 7px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--blue-500); box-shadow: 0 0 0 4px var(--blue-100);
}
.tl-item.ok::before { background: var(--green-500); box-shadow: 0 0 0 4px var(--green-100); }
.tl-item.warn::before { background: var(--amber-500); box-shadow: 0 0 0 4px var(--amber-100); }
.tl-time { font-size: .8em; color: var(--muted-2); }

/* ---------------- 错题条目 ---------------- */
.wrong-item {
  border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 14px 16px; background: #fff; margin-bottom: 12px;
  transition: all .16s;
}
.wrong-item:hover { border-color: var(--blue-200); box-shadow: var(--shadow-sm); }
.wrong-item.mastered { opacity: .62; background: var(--card-2); }
.wrong-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.wrong-stem { color: var(--ink); margin-bottom: 8px; }
.wrong-meta { display: flex; gap: 14px; flex-wrap: wrap; font-size: .84em; color: var(--muted); }
.wrong-acts { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }

/* ---------------- 试卷预览 / 打印条目 ---------------- */
.paper-meta { display: flex; gap: 22px; flex-wrap: wrap; font-size: .9em; color: var(--muted); }
.paper-meta b { color: var(--ink); }

/* 答题卡 */
.answer-sheet { display: flex; flex-wrap: wrap; gap: 8px; }
.as-item {
  width: 38px; height: 38px; border-radius: var(--r-xs);
  display: grid; place-items: center;
  border: 1.5px solid var(--line); background: #fff;
  font-weight: 700; font-size: .9em; color: var(--ink-3);
  transition: all .14s; cursor: pointer;
}
.as-item:hover { border-color: var(--blue-400); color: var(--blue-700); }
.as-item.done { background: var(--blue-50); border-color: var(--blue-300); color: var(--blue-700); }
.as-item.current { background: var(--blue-500); border-color: var(--blue-500); color: #fff; box-shadow: 0 4px 12px rgba(37,99,235,.34); }
.as-item.flagged { border-color: var(--amber-500); background: var(--amber-100); color: #92400e; }
.as-item.correct { background: var(--green-100); border-color: var(--green-500); color: var(--green-700); }
.as-item.wrong { background: var(--red-100); border-color: var(--red-500); color: #991b1b; }

/* 吸顶工具条 */
.sticky-bar {
  position: sticky; top: calc(var(--header-h) + 8px); z-index: 40;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: rgba(255,255,255,.94); backdrop-filter: blur(10px);
  border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 12px 18px; box-shadow: var(--shadow-sm); margin-bottom: 18px;
}
.timer-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: var(--r-full);
  background: var(--blue-50); color: var(--blue-700);
  font-weight: 800; font-family: var(--font-num); font-size: 1.02em;
}
.timer-chip.warn { background: var(--amber-100); color: #92400e; }
.timer-chip.danger { background: var(--red-100); color: #991b1b; animation: mx-pop .6s ease infinite alternate; }

.progress-mini { flex: 1 1 160px; min-width: 120px; }

/* 分页 */
.pager { display: flex; gap: 8px; align-items: center; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.pager button {
  min-width: 38px; height: 38px; padding: 0 12px;
  border-radius: var(--r-xs); border: 1.5px solid var(--line);
  background: #fff; font-weight: 700; color: var(--ink-3);
}
.pager button.on { background: var(--blue-500); border-color: var(--blue-500); color: #fff; }
.pager button:disabled { opacity: .45; }

/* 折叠面板 */
.acc { border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; margin-bottom: 10px; background: #fff; }
.acc-head { display: flex; align-items: center; justify-content: space-between; padding: 13px 18px; cursor: pointer; font-weight: 700; }
.acc-head:hover { background: var(--blue-50); }
.acc-body { padding: 4px 18px 16px; display: none; }
.acc.open .acc-body { display: block; }
.acc-arrow { transition: transform .18s; color: var(--muted); }
.acc.open .acc-arrow { transform: rotate(180deg); }