/* page-specific compositions, kept separate from shared components */

.learn-hero {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(135deg, var(--surface), var(--bg-elev));
}
.learn-hero-copy { max-width: 680px; }
.learn-hero .page-title { font-size: clamp(28px, 3.2vw, 38px); }
.learn-count { display: flex; gap: 20px; flex: 0 0 auto; }
.learn-count b { display: block; font-family: var(--font-mono); font-size: 28px; line-height: 1.1; letter-spacing: -0.04em; color: var(--brand); }
.learn-count span { color: var(--muted); font-size: 10px; }
.filter-summary { display: flex; align-items: center; gap: 8px; margin: 14px 0 10px; color: var(--muted); font-size: 11px; }
.filter-summary b { color: var(--ink); font-family: var(--font-mono); }

.article-layout { display: grid; gap: 24px; }
@media (min-width: 1100px) {
  .article-layout { grid-template-columns: minmax(0, 1fr) 296px; align-items: start; }
}
.article-main { min-width: 0; }
.article-key-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-top: 18px; }
.article-lead { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.article-side-card { padding: 15px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.article-side-card h3 { font-size: 12px; font-weight: 700; margin-bottom: 8px; }
.article-side-meta { display: flex; flex-direction: column; gap: 7px; }
.article-side-meta div { display: flex; justify-content: space-between; gap: 8px; font-size: 10.5px; color: var(--muted); }
.article-side-meta b { color: var(--ink-2); font-weight: 600; }
.article-actions { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 10px; }
.specificity-box { margin-top: 14px; padding: 14px 15px; border: 1px solid color-mix(in srgb, var(--brand) 22%, transparent); border-radius: 14px; background: var(--brand-soft); }
.specificity-box .label { color: var(--brand-ink); font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.08em; text-transform: uppercase; }
.specificity-box p { margin-top: 5px; color: var(--brand-ink); font-size: 12.5px; line-height: 1.7; }
.article-section .article-section-lead { color: var(--muted); font-size: 12.5px; }
.article-section .two-col-list { display: grid; grid-template-columns: 1fr 1fr; gap: 7px 18px; }
.article-section .two-col-list li { break-inside: avoid; }
.article-tip { display: flex; gap: 8px; margin-top: 12px; padding: 10px 12px; border-radius: 10px; background: var(--gold-soft, #f6ecd8); color: #795824; font-size: 11.5px; }
[data-theme="dark"] .article-tip { background: rgba(224, 180, 108, 0.12); color: #e0c28e; }
.ai-inline { margin-top: 16px; }
.ai-inline .ai-panel { border-radius: 15px; }

.practice-setup { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr); gap: 18px; align-items: start; }
.level-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.level-card { padding: 13px; border: 1px solid var(--line); border-radius: 13px; background: var(--bg-elev); text-align: left; transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast); }
.level-card:hover { transform: translateY(-1px); border-color: var(--line-strong); }
.level-card.active { border-color: var(--brand); background: var(--brand-soft); }
.level-card b { display: block; font-size: 12.5px; }
.level-card span { display: block; margin-top: 3px; color: var(--muted); font-size: 10px; line-height: 1.5; }
.practice-config { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.practice-config .field { flex: 1 1 150px; }
.practice-side-card { padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.practice-side-card + .practice-side-card { margin-top: 10px; }
.practice-side-card h3 { font-size: 13px; margin-bottom: 5px; }
.practice-side-card p { color: var(--muted); font-size: 11px; line-height: 1.65; }
.practice-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-top: 10px; }
.practice-stat { padding: 8px 9px; border-radius: 9px; background: var(--bg-elev); }
.practice-stat b { display: block; font-family: var(--font-mono); font-size: 17px; }
.practice-stat span { color: var(--muted); font-size: 9px; }
.quiz-card { padding: 18px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); box-shadow: var(--shadow-1); }
.quiz-side { display: flex; flex-direction: column; gap: 10px; }

.sim-intro { padding: 22px 24px; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); }
.sim-intro-grid { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; justify-content: space-between; }
.sim-rules { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 14px; color: var(--muted); font-size: 10.5px; }
.sim-rules span { display: inline-flex; align-items: center; gap: 5px; }
.sim-rules svg { width: 13px; height: 13px; color: var(--brand); }
.sim-session-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-bottom: 12px; }
.sim-session-title { font-size: clamp(22px, 2.8vw, 30px); letter-spacing: -0.03em; line-height: 1.2; }
.sim-session-sub { color: var(--muted); font-size: 11px; margin-top: 3px; }
.sim-exit { flex: 0 0 auto; }

.lab-intro { padding: 22px 24px; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); }
.lab-readout-row { display: flex; align-items: baseline; gap: 10px; }
.lab-number { font-family: var(--font-mono); font-size: 28px; font-weight: 700; letter-spacing: -0.04em; color: var(--brand); }
.lab-unit { color: var(--muted); font-size: 11px; }
.lab-stage strong { color: var(--ink); }
.lab-side-card { padding: 15px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.lab-side-card h3 { font-size: 12px; }
.lab-side-card p, .lab-side-card li { color: var(--muted); font-size: 10.5px; line-height: 1.7; }
.lab-side-card ul { padding-left: 15px; list-style: disc; margin-top: 5px; display: flex; flex-direction: column; gap: 3px; }

.me-header { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); }
.me-actions { display: flex; flex-wrap: wrap; gap: 6px; }
.me-chart { display: grid; grid-template-columns: 130px 1fr; gap: 18px; align-items: center; }
.progress-ring { width: 118px; height: 118px; transform: rotate(-90deg); }
.progress-ring circle { fill: none; stroke-width: 9; }
.progress-ring .track { stroke: var(--surface-3); }
.progress-ring .value { stroke: var(--brand); stroke-linecap: round; transition: stroke-dasharray var(--t-slow) var(--ease); }
.ring-label { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; }
.ring-wrap { position: relative; width: 118px; height: 118px; }
.ring-wrap b { font-family: var(--font-mono); font-size: 22px; line-height: 1; }
.ring-wrap span { display: block; color: var(--muted); font-size: 9px; margin-top: 3px; }
.quick-actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; }
.quick-action { display: flex; align-items: center; gap: 8px; padding: 10px; border: 1px solid var(--line); border-radius: 11px; background: var(--bg-elev); font-size: 11px; font-weight: 600; }
.quick-action svg { width: 15px; height: 15px; color: var(--brand); }
.quick-action:hover { border-color: var(--brand); }

.auth-switch { text-align: center; color: var(--muted); font-size: 11px; margin-top: 10px; }
.auth-switch button { border: 0; background: transparent; color: var(--brand); font-weight: 700; padding: 2px; }
.auth-note { padding: 9px 10px; border-radius: 9px; background: var(--brand-soft); color: var(--brand-ink); font-size: 10.5px; line-height: 1.6; }
.form-grid { display: grid; gap: 10px; }

.loading-panel { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 220px; color: var(--muted); font-size: 12px; }
.error-panel { padding: 18px; border: 1px solid color-mix(in srgb, var(--danger) 25%, transparent); border-radius: 14px; background: var(--danger-soft); color: var(--danger); font-size: 12px; }
.error-panel + .btn { margin-top: 10px; }
.inline-actions { display: flex; flex-wrap: wrap; gap: 6px; }

.learn-empty { padding: 44px 20px; text-align: center; border: 1px dashed var(--line-strong); border-radius: 18px; color: var(--muted); font-size: 12px; }
.learn-empty b { display: block; color: var(--ink); font-size: 17px; margin-bottom: 4px; }

.page-enter { animation: page-in var(--t-base) var(--ease) both; }
.fade-swap { animation: fade-in var(--t-fast) var(--ease) both; }

@media (max-width: 1099px) {
  .practice-setup { grid-template-columns: 1fr; }
  .learn-hero { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 719px) {
  .learn-hero { padding: 18px; border-radius: 20px; }
  .learn-count { gap: 15px; }
  .learn-count b { font-size: 23px; }
  .article-key-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-section .two-col-list { grid-template-columns: 1fr; }
  .level-grid { grid-template-columns: 1fr; }
  .quiz-card { padding: 13px; border-radius: 18px; }
  .me-header { align-items: flex-start; flex-direction: column; }
  .me-chart { grid-template-columns: 1fr; justify-items: center; }
  .quick-actions { grid-template-columns: 1fr 1fr; }
  .sim-intro { padding: 17px; border-radius: 20px; }
  .sim-session-head { flex-direction: column; }
  .lab-intro { padding: 17px; border-radius: 20px; }
}

/* ============================================================
   Mobile-first refinement (<=719px)
   目标：满宽单列、无横向溢出、44px 触控、可读字号、沉浸式监护
   ============================================================ */
@media (max-width: 719px) {
  html { font-size: 16px; }
  body { font-size: 16px; }

  .topbar {
    height: auto;
    min-height: calc(56px + env(safe-area-inset-top));
    padding-top: env(safe-area-inset-top);
  }
  .topbar-inner { min-height: 56px; padding: 0 13px; gap: 8px; }
  .topbar .brand { gap: 8px; min-width: 0; }
  .topbar .brand-mark { width: 34px; height: 34px; }
  .topbar .brand-word { font-size: 16px; white-space: nowrap; }
  .topbar-actions { gap: 3px; }
  .topbar .avatar { width: 44px; height: 44px; }
  .icon-btn { width: 44px; height: 44px; }

  .page {
    padding: 10px 12px calc(84px + env(safe-area-inset-bottom));
  }
  .page-head { gap: 10px; margin-bottom: 16px; }
  .page-eyebrow { font-size: 9.5px; gap: 6px; }
  .page-title { font-size: clamp(27px, 8vw, 34px); line-height: 1.15; }
  .page-sub { font-size: 14px; line-height: 1.65; margin-top: 6px; }
  .section { margin-top: 26px; }
  .section-head { gap: 3px; margin-bottom: 10px; }
  .section-title { font-size: 19px; }
  .section-kicker { font-size: 11px; }

  /* 首页：让 CTA 和统计形成满宽网格，而不是零散居中 */
  .hero {
    grid-template-columns: 1fr;
    gap: 17px;
    padding: 17px 15px;
    border-radius: 21px;
  }
  .hero-title { margin-top: 9px; font-size: clamp(32px, 9.8vw, 42px); line-height: 1.06; }
  .hero-sub { margin-top: 11px; font-size: 15px; line-height: 1.7; }
  .hero-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-top: 16px; }
  .hero-actions .btn-primary { grid-column: 1 / -1; }
  .hero-actions .btn { width: 100%; min-height: 46px; padding: 9px 10px; font-size: 12.5px; }
  .hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 16px;
    padding-top: 12px;
  }
  .hero-stat { padding: 7px 0; }
  .hero-stat b { font-size: 17px; }
  .hero-stat span { font-size: 9.5px; }
  .hero-chips { display: none; }
  .hero-visual .ecg-card { border-radius: 15px; }
  .hero-visual .ecg-toolbar-group { width: auto; justify-content: flex-start; }
  .hero-visual .ecg-toolbar-group:last-child { width: 100%; justify-content: flex-start; }
  .hero-visual .ecg-toolbar-group .ecg-tabs { flex: 1 1 auto; }

  .chapter-track {
    grid-auto-columns: 148px;
    gap: 8px;
    margin: 0 -12px;
    padding: 0 12px 7px;
  }
  .chapter-card { min-height: 112px; padding: 11px; border-radius: 14px; }
  .chapter-name { font-size: 13px; }
  .chapter-desc { font-size: 10px; }
  .chapter-foot { padding-top: 7px; }

  .daily-card { grid-template-columns: 1fr; gap: 12px; padding: 14px; border-radius: 18px; }
  .daily-card h3 { font-size: 20px !important; }
  .feature-grid { grid-template-columns: 1fr; gap: 9px; }
  .feature-card { padding: 15px; border-radius: 16px; }
  .feature-card p { font-size: 12.5px; }
  .feature-icon { width: 34px; height: 34px; margin-bottom: 9px; }

  /* 学习库：搜索满宽，章节筛选横向滚动，卡片满宽 */
  .learn-hero { padding: 15px; border-radius: 18px; gap: 13px; }
  .learn-hero .page-title { font-size: 29px; }
  .learn-count { width: 100%; display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .learn-count b { font-size: 22px; }
  .filter-bar { gap: 7px; margin-bottom: 10px; }
  .search-box { flex: 1 1 100%; }
  .filter-bar > .select { flex: 1 1 100%; }
  [data-chapter-chips] {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    width: 100%;
    gap: 6px;
    padding-bottom: 4px;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
  }
  [data-chapter-chips]::-webkit-scrollbar { display: none; }
  .chip { min-height: 44px; padding: 8px 12px; font-size: 11.5px; }
  .filter-summary { margin: 8px 0; font-size: 10.5px; }
  .card-grid { grid-template-columns: 1fr; gap: 9px; }
  .diagnosis-card { min-height: 0; border-radius: 15px; }
  .diagnosis-card-body { padding: 11px 12px 11px; gap: 5px; }
  .diagnosis-name { font-size: 16px; }
  .diagnosis-line { font-size: 12.5px; }
  .mini-ecg, .mini-ecg canvas { height: 52px; }

  /* 通用触控与表单 */
  .btn { min-height: 46px; }
  .btn-sm { min-height: 44px; padding: 8px 12px; font-size: 12.5px; }
  .btn-xs { min-height: 44px; padding: 8px 10px; font-size: 11px; }
  .input, .select, .textarea { min-height: 48px; font-size: 16px; }
  .textarea { line-height: 1.55; }
  .segmented { width: 100%; }
  .segment { flex: 1; min-height: 44px; font-size: 12px; }
  .switch { min-height: 44px; }

  /* 文章：满宽阅读，减少居中窄块；TOC 在手机上隐藏，内容优先 */
  .article-layout { gap: 15px; }
  .article-hero { padding: 16px 15px; border-radius: 19px; }
  .article-title { font-size: clamp(28px, 8.4vw, 37px); }
  .article-en { font-size: 9px; overflow-wrap: anywhere; }
  .article-one { margin-top: 9px; font-size: 14px; line-height: 1.7; }
  .article-tags { gap: 5px; margin-top: 10px; }
  .article-key-grid { grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 13px; }
  .key-number { padding: 9px 10px; border-radius: 11px; }
  .key-number-value { font-size: 17px; }
  .key-number-label { font-size: 9.5px; }
  .specificity-box { margin-top: 10px; padding: 11px 12px; border-radius: 12px; }
  .specificity-box p { font-size: 12.5px; line-height: 1.65; }
  .article-section { margin-top: 23px; }
  .article-section h2 { font-size: 18px; margin-bottom: 8px; }
  .article-section h2::before { height: 15px; }
  .article-section p, .article-section li { font-size: 16px; line-height: 1.72; }
  .article-section li { padding-left: 18px; }
  .article-section ul, .article-section ol { gap: 7px; }
  .article-aside { gap: 9px; }
  .article-aside > .toc { display: none; }
  .article-side-card { padding: 13px; border-radius: 14px; }
  .article-nav { gap: 8px; margin-top: 22px; }
  .related-grid { grid-template-columns: 1fr; }

  /* ECG 播放器工具栏：移动端分为清晰的两到三行，不再挤成一条 */
  .ecg-toolbar { align-items: stretch; padding: 7px 8px; gap: 5px; }
  .ecg-toolbar-group { width: 100%; justify-content: flex-start; flex-wrap: wrap; gap: 5px; }
  .ecg-toolbar-group + .ecg-toolbar-group { margin-top: 0; }
  .ecg-toolbar-label { font-size: 9px; }
  .ecg-tab { min-height: 44px; padding: 8px 10px; font-size: 10.5px; }
  .ecg-toolbar .btn-xs { min-height: 44px; }
  .ecg-toolbar select { min-height: 44px !important; font-size: 14px !important; }
  .ecg-meta { padding: 6px 9px; gap: 4px 9px; font-size: 8px; line-height: 1.5; }
  .ecg-legend { display: none; }
  .ecg-note { font-size: 9.5px; }
  .ecg-scroll-hint { font-size: 9px; }
  .textbook-grid { grid-template-columns: 1fr 1fr; gap: 6px; padding: 9px; }
  .textbook-card { padding: 8px 9px; }
  .textbook-card p { font-size: 10px; }
  .textbook-metrics { font-size: 9px; gap: 4px 9px; }

  /* 练习：结果页改为全宽左对齐，避免居中卡片两侧大空档 */
  .practice-setup { grid-template-columns: 1fr; gap: 11px; }
  .quiz-card { padding: 12px; border-radius: 17px; }
  .quiz-top { flex-wrap: wrap; gap: 8px; }
  .quiz-progress { width: 100%; justify-content: space-between; gap: 7px; font-size: 10px; }
  .quiz-progress .progress { flex: 1; width: auto; min-width: 42px; }
  .quiz-question { margin: 12px 0 8px; font-size: 21px; }
  .quiz-stem { font-size: 12.5px; margin-bottom: 9px; }
  .option-list { gap: 7px; }
  .option-card { min-height: 54px; padding: 11px 12px; }
  .option-text { font-size: 15.5px; }
  .option-note { display: none; }
  .quiz-actions { gap: 8px; }
  .quiz-actions .btn { width: 100%; }
  .quiz-feedback { padding: 13px; border-radius: 14px; }
  .feedback-title { font-size: 14px; }
  .feedback-text { font-size: 12.5px; }
  .quiz-result { width: 100%; max-width: none; margin: 0; padding: 18px 15px; text-align: left; border-radius: 20px; }
  .result-score { font-size: 54px; }
  .result-label { text-align: left; }
  .result-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin: 15px 0; }
  .result-stats > div { padding: 9px 7px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg-elev); }
  .result-stats b { font-size: 17px; }
  .quiz-result .row-wrap { justify-content: stretch !important; }
  .quiz-result .row-wrap .btn { flex: 1; }

  /* 模拟：监护满宽，操作面板紧跟监护；事件记录后置 */
  .sim-session-head { gap: 8px; margin-bottom: 9px; }
  .sim-session-title { font-size: 22px; }
  .sim-layout { display: flex; flex-direction: column; gap: 9px; }
  .sim-layout > .stack-lg { display: contents; }
  .sim-layout .monitor-panel { order: 1; }
  .sim-layout .sim-side { order: 2; }
  .sim-layout .hint-card { order: 3; }
  .sim-layout .stack-lg > .card { order: 4; }
  .monitor-head { padding: 8px 10px; }
  .monitor-title { font-size: 9px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
  .monitor-body { padding: 9px; }
  .vitals-grid { grid-template-columns: 1fr 1fr; gap: 5px; }
  .vital { padding: 7px 8px; }
  .vital-value { font-size: 17px; }
  .monitor-foot { flex-wrap: wrap; gap: 5px 10px; font-size: 8px; }
  .action-panel { padding: 10px; border-radius: 14px; }
  .sim-side { gap: 8px; }
  .action-grid { grid-template-columns: 1fr 1fr; gap: 5px; }
  .action-btn { min-height: 46px; font-size: 11px; padding: 7px; }
  .shock-controls { padding: 9px; }
  .shock-controls select { min-height: 42px !important; font-size: 14px !important; }
  .sync-switch button { min-height: 44px; padding: 6px 10px; font-size: 10px; }
  .hint-card { font-size: 11px; padding: 9px 10px; }
  .event-log { max-height: 160px; padding: 9px 10px; }
  .debrief-hero { padding: 17px; border-radius: 16px; }
  .debrief-score { font-size: 48px; }

  /* 实验室：先看波形，再操作；控件全宽 */
  .lab-grid { grid-template-columns: 1fr; gap: 10px; }
  .lab-viewers { gap: 9px; }
  .lab-viewers .ecg-card { border-radius: 14px; }
  .lab-controls { padding: 14px; border-radius: 16px; }
  .lab-slider { margin-bottom: 16px; }
  .lab-slider-value { font-size: 18px; }
  .lab-slider input[type="range"] { height: 44px; }
  .range-badges { gap: 4px; }
  .range-badges .badge { font-size: 8.5px; }
  .lab-stages { gap: 8px; }

  /* 我的：环形进度与章节进度并排，避免整块居中 */
  .me-grid { grid-template-columns: 1fr; gap: 10px; }
  .me-header { padding: 13px; border-radius: 17px; }
  .profile-avatar { width: 42px; height: 42px; border-radius: 13px; }
  .profile-name { font-size: 17px; }
  .me-chart { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
  .me-chart .chapter-progress-list { width: 100%; }
  .ring-wrap, .progress-ring { width: 88px; height: 88px; }
  .ring-wrap b { font-size: 17px; }
  .ring-wrap span { font-size: 8px; }
  .chapter-progress-list { gap: 8px; }
  .chapter-progress-name { font-size: 10.5px; }
  .chapter-progress-meta { font-size: 9px; }
  .quick-actions { grid-template-columns: 1fr 1fr; gap: 6px; }
  .quick-action { min-height: 46px; padding: 9px; font-size: 10.5px; }
  .settings-row { padding: 10px 0; }
  .leader-row { min-height: 44px; }
  .leader-name { font-size: 11px; }

  .modal { max-height: 90dvh; padding-bottom: env(safe-area-inset-bottom); border-radius: 22px 22px 0 0; }
  .ai-messages { max-height: 260px; }
  .ai-bubble { font-size: 12px; }
  .ai-suggestion { min-height: 44px; padding: 8px 10px; font-size: 10px; }
  .ai-input-row .input { min-height: 44px; font-size: 16px; }
  .toast-region { bottom: calc(78px + env(safe-area-inset-bottom)); }
  .footer, .page-footer { font-size: 9.5px; }
}

/* overflow safety for long labels and monitor headings */
.monitor-title { min-width: 0; }
.monitor-title, .brand-word, .leader-name, .diagnosis-name, .article-title { overflow-wrap: anywhere; }
@media (max-width: 719px) {
  body { overscroll-behavior-y: contain; }
  .article-section p, .article-section li { max-width: 46em; }
  .ecg-toolbar-group { min-width: 0; }
  .ecg-toolbar-group .ecg-tabs { min-width: 0; }
  .ecg-toolbar-group .ecg-tab { flex: 1 1 auto; }
  .monitor-head .monitor-title { max-width: calc(100% - 58px); }
  .page-head > * { min-width: 0; }
  .section-head > * { min-width: 0; }
}

@media (max-width: 719px) {
  .textbook-compare { grid-template-columns: 82px minmax(0, 1fr); gap: 7px; margin: 0 9px 8px; padding: 7px 8px; }
  .textbook-compare-label b { font-size: 10px; }
  .textbook-compare-label span { font-size: 8px; }
  .textbook-compare .mini-ecg, .textbook-compare .mini-ecg canvas { height: 44px; }
}

@media (max-width: 719px) {
  .hero-copy, .hero-visual, .practice-setup > *, .sim-layout > *, .sim-side,
  .lab-viewers, .lab-grid > *, .me-grid > *, .article-main, .article-aside,
  .quiz-card, .monitor-panel, .textbook-card, .topbar-inner > * { min-width: 0; }
  .article-en, .diagnosis-en, .scenario-name, .event-item, .feedback-text, .local-text { overflow-wrap: anywhere; }
  .article-sub, .page-sub { max-width: 100%; }
}

/* desktop: wrap chapter cards instead of clipping a horizontal scroller */
@media (min-width: 1100px) {
  .chapter-track {
    grid-auto-flow: row;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow: visible;
  }
}

@media (max-width: 719px) {
  .textbook-zoom { margin: 8px 9px 0; }
  .textbook-zoom-head { font-size: 8px; padding: 6px 8px; }
}

@media (max-width: 719px) {
  .page { animation: none; }
  .sim-layout { padding-bottom: calc(96px + env(safe-area-inset-bottom)); }
  .cpr-dock:not([hidden]) {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: calc(var(--bottomnav-h) + 10px + env(safe-area-inset-bottom));
    z-index: 44;
    box-shadow: var(--shadow-2);
  }
  .cpr-dock { padding: 10px; gap: 8px; border-radius: 13px; }
  .cpr-dock-info strong { font-size: 15px; }
  .cpr-dock-info > span:last-child { font-size: 10px; }
  .cpr-dock .btn { min-width: 105px; min-height: 46px; padding: 8px; font-size: 12px; }
  .iv-status { font-size: 10px; }
}

@media (max-width: 719px) {
  .charge-row .btn { min-height: 44px; font-size: 11px; }
}

/* ---------- admin console ---------- */
.admin-page { max-width: 1180px; }
.admin-head { display:flex; align-items:flex-end; justify-content:space-between; gap:14px; margin-bottom:16px; }
.admin-head .page-title { font-size: clamp(26px, 4vw, 34px); }
.admin-login-wrap { min-height: 62vh; display:grid; place-items:center; }
.admin-login { width:min(430px,100%); }
.admin-lock { width:52px; height:52px; display:grid; place-items:center; border-radius:16px; color:var(--brand); background:var(--brand-soft); margin-bottom:12px; }
.admin-login .field { margin-top:9px; }
.admin-login-foot { margin-top:12px; padding-top:10px; border-top:1px solid var(--line); color:var(--faint); font-size:10px; line-height:1.6; }
.admin-tabs { display:flex; flex-wrap:wrap; gap:6px; margin-bottom:12px; }
.admin-kpi-grid { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:9px; }
.admin-kpi { padding:14px; border:1px solid var(--line); border-radius:14px; background:var(--surface); display:flex; flex-direction:column; gap:3px; }
.admin-kpi span { color:var(--muted); font-size:10px; }
.admin-kpi b { font-size:26px; letter-spacing:-.03em; }
.admin-kpi small { color:var(--faint); font-size:9.5px; }
.admin-notes { display:grid; gap:8px; margin-top:9px; color:var(--muted); font-size:11.5px; line-height:1.65; }
.admin-notes > div { display:flex; align-items:flex-start; gap:7px; }
.admin-notes svg { color:var(--brand); flex:0 0 auto; margin-top:2px; }
.admin-settings-grid { display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-top:12px; align-items:end; }
.admin-check { display:flex; align-items:center; gap:7px; min-height:36px; color:var(--ink-2); font-size:11.5px; }
.admin-check input { width:16px; height:16px; accent-color:var(--brand); }
.admin-provider-list { display:flex; flex-direction:column; gap:7px; margin-top:10px; }
.admin-provider { display:flex; align-items:center; justify-content:space-between; gap:10px; padding:9px 10px; border:1px solid var(--line); border-radius:10px; background:var(--bg-elev); font-size:11.5px; }
.admin-provider .row-wrap { flex:0 0 auto; }
.admin-provider code, .admin-notes code { font-family:var(--font-mono); font-size:10px; color:var(--brand-ink); }
.admin-table-wrap { overflow-x:auto; margin-top:8px; border:1px solid var(--line); border-radius:11px; }
.admin-table { width:100%; border-collapse:collapse; min-width:720px; font-size:11px; }
.admin-table th, .admin-table td { padding:8px 9px; border-bottom:1px solid var(--line); text-align:left; vertical-align:middle; }
.admin-table th { color:var(--muted); font-size:9.5px; font-weight:650; background:var(--bg-elev); }
.admin-table tr:last-child td { border-bottom:none; }
.admin-audit { display:flex; flex-direction:column; gap:4px; max-height:520px; overflow:auto; }
.admin-audit-row { display:grid; grid-template-columns:130px 170px 100px minmax(0,1fr); gap:7px; align-items:start; padding:6px 0; border-bottom:1px solid var(--line); color:var(--muted); font-size:10px; }
.admin-audit-row b { color:var(--ink-2); font-weight:650; }
.admin-audit-row code { color:var(--faint); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
@media (max-width: 719px) {
  .admin-head { align-items:flex-start; flex-direction:column; }
  .admin-kpi-grid { grid-template-columns:1fr 1fr; }
  .admin-settings-grid { grid-template-columns:1fr; }
  .admin-provider { align-items:flex-start; flex-direction:column; }
  .admin-audit-row { grid-template-columns:1fr 1fr; }
  .admin-audit-row code { grid-column:1/-1; white-space:normal; }
}

/* ---------- vector / electrophysiology lab ---------- */
.vector-page { max-width: 1180px; }
.vector-head { display:flex; align-items:flex-end; justify-content:space-between; gap:14px; margin-bottom:16px; }
.vector-head .page-sub { max-width:760px; }
.visual-tabs { display:flex; flex-wrap:wrap; gap:6px; margin-bottom:12px; }
.visual-grid { display:grid; grid-template-columns:minmax(0,1fr) 340px; gap:12px; align-items:start; }
.visual-card { border:1px solid var(--line); border-radius:16px; background:var(--surface); overflow:hidden; min-width:0; }
.visual-card-dark { background:var(--ecg-bg); border-color:color-mix(in srgb,var(--brand) 30%,var(--line)); }
.visual-card canvas { display:block; width:100%; height:auto; }
.visual-controls { display:flex; flex-wrap:wrap; align-items:center; gap:7px; padding:9px 10px; background:var(--surface); border-top:1px solid var(--line); }
.visual-range { display:flex; align-items:center; gap:5px; color:var(--muted); font-size:10px; }
.visual-range input { width:90px; accent-color:var(--brand); }
.visual-explain { border:1px solid var(--line); border-radius:16px; padding:15px; background:var(--surface); color:var(--ink-2); font-size:11.5px; line-height:1.7; }
.visual-explain h3 { color:var(--ink); font-size:17px; letter-spacing:-.02em; margin-bottom:7px; }
.visual-explain p { margin-bottom:8px; }
.visual-legend { display:flex; flex-wrap:wrap; gap:10px; margin:10px 0; color:var(--muted); font-size:10px; }
.visual-legend span { display:inline-flex; align-items:center; gap:5px; }
.visual-legend i { width:8px; height:8px; border-radius:50%; display:inline-block; }
.visual-tip { margin-top:10px; padding:9px 10px; border-radius:9px; background:var(--brand-soft); color:var(--brand-ink); font-size:10.5px; line-height:1.6; }
.visual-footnote { margin-top:12px; color:var(--faint); font-size:10px; }
.axis-table { display:flex; flex-direction:column; gap:5px; margin-top:8px; }
.axis-table > div { display:grid; grid-template-columns:54px 36px minmax(0,1fr); gap:6px; align-items:baseline; padding:5px 0; border-bottom:1px solid var(--line); }
.axis-table b { color:var(--ink); font-size:10.5px; }
.axis-table span { color:var(--brand); font-family:var(--font-mono); font-size:10px; }
.axis-table small { color:var(--muted); font-size:9.5px; line-height:1.45; }
.chest-svg-wrap, .anatomy-svg-wrap { padding:10px; background:var(--bg-elev); }
.chest-svg, .anatomy-svg { display:block; width:100%; height:auto; max-height:430px; }
.chest-lead { cursor:pointer; }
.chest-lead.active circle, .chest-lead:focus circle { fill:var(--brand); }
.chest-lead.active text, .chest-lead:focus text { fill:#fff; }
.chest-lead:focus { outline:none; }
.chest-list { display:flex; flex-direction:column; gap:4px; margin-top:9px; }
.chest-list button { display:flex; gap:7px; text-align:left; padding:5px 0; border:0; border-bottom:1px solid var(--line); background:none; color:var(--muted); font:inherit; font-size:10px; line-height:1.45; cursor:pointer; }
.chest-list button b { color:var(--brand); min-width:22px; }
.chest-list button:hover { color:var(--ink); }
.chest-selected, .anatomy-selected { margin-bottom:9px; padding:9px; border-radius:9px; background:var(--brand-soft); color:var(--brand-ink); }
.chest-selected span { display:block; font-size:9px; letter-spacing:.06em; text-transform:uppercase; }
.chest-selected b { font-size:18px; }
.chest-selected p, .anatomy-selected p { margin-top:3px; }
.anatomy-label { cursor:pointer; }
.anatomy-label:hover circle { fill:var(--brand); }
.anatomy-label:hover text { fill:#fff; }
.conduction-path { animation: conduction-dash 2s linear infinite; }
@keyframes conduction-dash { to { stroke-dashoffset: -20; } }
.anatomy-facts { display:flex; flex-direction:column; gap:5px; margin:9px 0; }
.anatomy-facts > div { display:grid; grid-template-columns:64px minmax(0,1fr); gap:6px; padding:5px 0; border-bottom:1px solid var(--line); font-size:10px; }
.anatomy-facts b { color:var(--ink); }
.anatomy-facts span { color:var(--muted); line-height:1.5; }
.visual-steps, .phase-list { display:flex; flex-direction:column; gap:7px; margin-top:8px; }
.visual-steps > div, .phase-list > div { display:grid; grid-template-columns:90px minmax(0,1fr); gap:7px; padding:6px 0; border-bottom:1px solid var(--line); font-size:10px; line-height:1.55; }
.visual-steps b, .phase-list b { color:var(--ink); }
.visual-steps span, .phase-list span { color:var(--muted); }
.ion-diagram { padding:15px; }
.ion-cell { position:relative; padding:18px; border:1px solid color-mix(in srgb,var(--brand) 30%,var(--line)); border-radius:12px; background:color-mix(in srgb,var(--brand) 7%,var(--surface)); text-align:center; }
.ion-cell b { display:block; position:relative; z-index:1; color:var(--ink); }
.ion-cell span { position:relative; z-index:1; color:var(--muted); font-size:10px; }
.ion-membrane { position:absolute; inset:8px; border:1px dashed color-mix(in srgb,var(--brand) 45%,transparent); border-radius:8px; }
.ion-channel-row { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:7px; margin-top:10px; }
.ion-channel { padding:10px; border:1px solid var(--line); border-radius:10px; background:var(--bg-elev); }
.ion-channel b { display:block; font-family:var(--font-mono); font-size:15px; color:var(--brand); }
.ion-channel span { display:block; margin-top:2px; color:var(--ink-2); font-size:10px; }
.ion-channel small { display:block; margin-top:5px; color:var(--muted); font-size:9px; line-height:1.5; }
.ion-channel.na { border-top:3px solid var(--accent); }
.ion-channel.ca { border-top:3px solid var(--gold); }
.ion-channel.k { border-top:3px solid var(--brand); }
@media (max-width: 1099px) { .visual-grid { grid-template-columns:1fr; } }
@media (max-width: 719px) {
  .vector-head { align-items:flex-start; flex-direction:column; }
  .visual-controls { gap:5px; }
  .visual-range input { width:76px; }
  .ion-channel-row { grid-template-columns:1fr; }
}

/* ---------- electrolyte lab: extra content ---------- */
.lab-ion-table { display:flex; flex-direction:column; gap:4px; margin-top:8px; }
.lab-ion-table > div { display:grid; grid-template-columns:34px 68px minmax(0,1fr); gap:5px; align-items:baseline; padding:5px 0; border-bottom:1px solid var(--line); font-size:10px; }
.lab-ion-table b { color:var(--brand); font-family:var(--font-mono); }
.lab-ion-table span { color:var(--muted); font-family:var(--font-mono); font-size:9.5px; }
.lab-ion-table small { color:var(--muted); line-height:1.45; }
.lab-extra-grid { display:grid; grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr); gap:12px; margin-top:14px; align-items:start; }
.lab-case-list { display:flex; flex-direction:column; gap:6px; margin-top:9px; }
.lab-case { display:flex; flex-direction:column; gap:3px; padding:9px 10px; border:1px solid var(--line); border-radius:10px; background:var(--bg-elev); color:var(--ink-2); text-align:left; font:inherit; cursor:pointer; transition:border-color var(--t-fast), background var(--t-fast); }
.lab-case:hover { border-color:var(--brand); background:var(--brand-soft); }
.lab-case b { color:var(--ink); font-size:11.5px; }
.lab-case span { color:var(--muted); font-size:10px; line-height:1.55; }
.lab-case small { color:var(--faint); font-family:var(--font-mono); font-size:8.5px; }
.lab-quiz { display:flex; flex-direction:column; gap:9px; margin-top:9px; }
.lab-quiz-item { padding-bottom:8px; border-bottom:1px solid var(--line); }
.lab-quiz-q { color:var(--ink-2); font-size:10.5px; line-height:1.55; margin-bottom:6px; }
.lab-quiz-q b { color:var(--brand); }
.lab-quiz-options { display:flex; flex-wrap:wrap; gap:4px; }
.lab-quiz-options .chip { font-size:9px; padding:4px 7px; }
.lab-quiz-options .chip.right { color:var(--ok); background:var(--ok-soft); border-color:color-mix(in srgb,var(--ok) 35%,transparent); }
.lab-quiz-options .chip.wrong { color:var(--danger); background:var(--danger-soft); border-color:color-mix(in srgb,var(--danger) 35%,transparent); }
.lab-quiz-why { margin-top:5px; color:var(--muted); font-size:9.5px; line-height:1.55; }
.lab-quiz-item.right { border-color:color-mix(in srgb,var(--ok) 25%,var(--line)); }
.lab-quiz-item.wrong { border-color:color-mix(in srgb,var(--danger) 25%,var(--line)); }
@media (max-width: 900px) { .lab-extra-grid { grid-template-columns:1fr; } }
@media (max-width: 719px) {
  .lab-viewers .ecg-toolbar .row-wrap { flex-wrap:wrap; }
  .lab-quiz-options .chip { font-size:8.5px; }
  .lab-ion-table > div { grid-template-columns:30px 58px minmax(0,1fr); }
}
.lab-12lead-card .ecg-canvas-shell { overflow-x:auto; overflow-y:hidden; }
.lab-12lead-card .ecg-canvas { min-width:780px; }
.lab-12lead-card .ecg-toolbar .row-wrap { flex-wrap:wrap; }
@media (max-width:719px) {
  .lab-12lead-card .ecg-toolbar { align-items:flex-start; }
  .lab-12lead-card .ecg-toolbar .row-wrap { width:100%; }
}
.visual-sync { background:var(--ecg-bg); border-top:1px solid color-mix(in srgb,var(--brand) 18%,var(--line)); }
.visual-sync-head { display:flex; justify-content:space-between; gap:8px; padding:6px 10px 0; color:var(--muted); font-family:var(--font-mono); font-size:8.5px; }
.visual-sync-head span:first-child { color:var(--brand); font-weight:700; }
.visual-sync canvas { display:block; width:100%; height:auto; }