/* ==========================================================================
   面试工作台 - 移动端独立布局 (mobile.css)
   仅在 <= 1024px 生效；桌面端样式完全不受影响
   ========================================================================== */

@media (max-width: 1024px) {
  html { -webkit-text-size-adjust: 100%; }

  body {
    padding-bottom: calc(52px + env(safe-area-inset-bottom));
    overflow-x: hidden;
  }

  body.drawer-open { overflow: hidden; }

  .desktop-only,
  .brand-badge,
  .nav-links,
  .category-sidebar,
  .status-sidebar,
  #grid-stat-summary {
    display: none !important;
  }

  .mobile-only { display: inline-flex !important; }

  .app-container { padding: 0; max-width: none; }

  /* 顶栏 */
  .top-navbar {
    height: calc(52px + env(safe-area-inset-top));
    padding: env(safe-area-inset-top) 16px 0;
    background: rgba(11, 15, 25, 0.96);
    backdrop-filter: blur(14px);
  }

  .brand-title { font-size: 17px; line-height: 1; }
  .header-status { gap: 8px; }

  #mobile-stat-badge {
    display: inline-flex !important;
    align-items: center;
    font-size: 12px;
    font-weight: 700;
    color: var(--violet);
    background: rgba(167, 139, 250, 0.12);
    border: 1px solid rgba(167, 139, 250, 0.45);
    padding: 3px 10px;
    border-radius: 999px;
    white-space: nowrap;
  }

  /* ============================ 刷题页 ============================ */
  #view-quiz-container {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    padding: 0 12px 132px;
  }

  /* 刷题/答题模式下操作栏独占底部，内容留白相应收窄 */
  body.in-quiz #view-quiz-container {
    padding-bottom: 96px;
  }

  .mobile-category-bar {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    position: sticky;
    top: calc(52px + env(safe-area-inset-top));
    z-index: 30;
    background: var(--bg-primary);
    padding: 8px 0;
    margin: 0 0 2px;
    scrollbar-width: none;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
  }

  .mobile-category-bar::-webkit-scrollbar { display: none; }

  .mobile-cat-pill {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 14px;
    border-radius: 999px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    scroll-snap-align: center;
  }

  .mobile-cat-pill.active {
    background: var(--accent-blue);
    border-color: var(--accent-ink);
    color: var(--accent-ink);
  }

  .mobile-progress-summary {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
    padding: 0 2px 10px;
  }

  .quiz-layout-grid { display: block; }
  .main-stage-col { width: 100%; }

  .question-card {
    padding: 18px;
    border-radius: 14px;
    margin-bottom: 16px;
    box-shadow: none;
  }

  .question-meta-bar {
    margin-bottom: 12px;
    padding-bottom: 10px;
  }

  .question-index-tag { font-size: 12px; }
  .badge-level { font-size: 11px; padding: 2px 8px; }

  .question-title {
    font-size: 17px;
    line-height: 1.7;
    margin-bottom: 18px;
  }

  .options-list { gap: 10px; margin-bottom: 14px; }

  .option-item-btn {
    min-height: 48px;
    padding: 12px 14px;
    font-size: 15px;
    line-height: 1.5;
    border-radius: 10px;
  }

  .option-item-btn:active {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
  }

  .option-letter { width: 24px; height: 24px; font-size: 12px; }

  /* 掌握度选择器：四档等宽（细节样式见文件末尾「刷题模式」区块） */
  .mastery-picker-head { width: 100%; }

  .question-footer-bar { display: none; }

  .analysis-drawer {
    margin-top: 14px;
    padding: 14px;
    font-size: 14px;
    line-height: 1.7;
    overflow-x: auto;
  }
}

@media (max-width: 1024px) {
  /* 固定刷题操作栏 */
  .mobile-quiz-actionbar {
    display: flex;
    gap: 8px;
    position: fixed;
    left: 0;
    right: 0;
    bottom: calc(52px + env(safe-area-inset-bottom));
    height: 56px;
    padding: 8px 12px;
    background: rgba(11, 15, 25, 0.97);
    border-top: 1px solid var(--border-subtle);
    backdrop-filter: blur(14px);
    z-index: 90;
  }

  /* 刷题/答题模式下底栏隐藏，操作栏贴到屏幕最底部 */
  body.in-quiz .mobile-quiz-actionbar {
    bottom: env(safe-area-inset-bottom);
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
  }

  .mobile-action-btn {
    flex: 1;
    min-height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border-strong);
    background: var(--bg-subtle);
    color: var(--text-main);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
  }

  .mobile-action-btn.primary {
    flex: 1.4;
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: var(--accent-ink);
  }

  .mobile-action-btn:active { transform: scale(0.98); }
  .mobile-action-btn:disabled { opacity: 0.35; }

  /* 滑动切题动画 */
  .swipe-out-left { animation: swipeOutLeft 0.14s ease-in forwards; }
  .swipe-out-right { animation: swipeOutRight 0.14s ease-in forwards; }
  .swipe-in { animation: swipeIn 0.18s ease-out; }

  @keyframes swipeOutLeft {
    to { opacity: 0; transform: translateX(-28px); }
  }
  @keyframes swipeOutRight {
    to { opacity: 0; transform: translateX(28px); }
  }
  @keyframes swipeIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
  }

  /* 底部导航：常驻吸底 */
  .mobile-bottom-bar {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    height: calc(52px + env(safe-area-inset-bottom));
    padding: 0 8px env(safe-area-inset-bottom);
    background: rgba(17, 24, 39, 0.98);
    border-top: 1px solid var(--border-card);
    backdrop-filter: blur(14px);
  }

  .bottom-tab-btn {
    position: relative;
    flex: 1;
    min-height: 52px;
    gap: 3px;
    padding: 4px 2px;
    font-size: var(--fs-xs);
    font-weight: 500;
    color: var(--text-muted);
    white-space: nowrap;
    transition: color 0.15s ease;
  }

  /* 激活态用一条短指示线，比只换文字色更容易一眼定位 */
  .bottom-tab-btn.active { color: var(--accent-cyan); font-weight: 700; }
  .bottom-tab-btn.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    border-radius: 0 0 2px 2px;
    background: var(--accent-cyan);
  }

  .bottom-tab-btn:active { opacity: 0.65; }
  .bottom-tab-icon { width: 22px; height: 22px; flex-shrink: 0; }

  .bottom-tab-count {
    width: auto;
    height: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    border-radius: 999px;
    background: var(--surface-sunken);
    font-size: var(--fs-xs);
    font-weight: 700;
    line-height: 1;
    white-space: nowrap;
  }
}

@media (max-width: 1024px) {
  /* 题卡抽屉 */
  .drawer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    opacity: 0;
    transition: opacity 0.22s ease;
    z-index: 140;
  }

  .drawer-overlay.open { opacity: 1; }

  .bottom-sheet-drawer {
    display: none;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 150;
    max-height: 82vh;
    background: var(--bg-surface);
    border-radius: 20px 20px 0 0;
    border-top: 1px solid var(--border-strong);
    box-shadow: 0 -12px 32px rgba(0, 0, 0, 0.6);
    padding: 6px 16px calc(16px + env(safe-area-inset-bottom));
    flex-direction: column;
    transform: translateY(100%);
    transition: transform 0.24s cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  .bottom-sheet-drawer.open { transform: translateY(0); }

  .drawer-handle {
    width: 40px;
    height: 4px;
    border-radius: 2px;
    background: var(--border-strong);
    margin: 6px auto 10px;
    flex-shrink: 0;
  }

  .drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    padding-bottom: 8px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border-subtle);
  }

  .drawer-title { font-size: 16px; font-weight: 700; color: #ffffff; }
  .drawer-filter-section { flex-shrink: 0; }
  .drawer-filter-section .panel-section-title { margin-bottom: 6px; }

  .mobile-question-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    overflow-y: auto;
    max-height: none;
    flex: 1;
    padding: 10px 0;
  }

  .mobile-question-grid .grid-num-btn {
    height: 44px;
    font-size: 14px;
    border-radius: 8px;
  }

  .drawer-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    padding-top: 10px;
    border-top: 1px solid var(--border-subtle);
    font-size: 12px;
    color: var(--text-muted);
  }

  .drawer-reset { color: var(--accent-red); cursor: pointer; }
}

@media (max-width: 1024px) {
  /* ============================ 架构图解 ============================ */
  #view-visualizer-container {
    gap: 12px;
    padding: 12px 12px calc(76px + env(safe-area-inset-bottom));
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
  }

  .section-panel { padding: 12px; }
  .panel-topbar { align-items: flex-start; }
  .filter-row { flex-wrap: wrap; overflow: visible; }
  .filter-row .btn { min-height: 36px; }

  .vis-card { padding: 14px; border-radius: 14px; }
  .vis-header { gap: 8px; }
  .vis-header > div { flex-wrap: wrap; gap: 6px; }
  .vis-title-cn { font-size: 15px; }
  .vis-title-en { font-size: 11px; }
  .vis-stage { padding: 12px; min-height: 0; }
  .vis-stage-pad { padding: 12px; }
  .vis-desc-box { font-size: 12px; line-height: 1.6; }

  .vis-flow { flex-direction: column; align-items: stretch; gap: 10px; }
  .vis-flow .vis-arrow { transform: rotate(90deg); align-self: center; }
  .vis-node { width: 100%; min-width: 0; }
  .vis-row { flex-direction: column; align-items: stretch; gap: 10px; }
  .vis-queue { min-width: 0; width: 100%; }

  .sk-track { min-width: 0; width: 100%; gap: 8px; }
  .sk-layer { gap: 3px; }
  .sk-layer-label { width: 38px; font-size: 10px; }
  .sk-node { min-width: 0; padding: 3px 4px; font-size: 10px; }
  .sk-arrow { font-size: 10px; letter-spacing: -0.08em; }

  .mvcc-slider-row { gap: 6px; }
  .mvcc-slider-label { width: 100%; }
  .mvcc-range { width: 100%; }
  .mvcc-legend { flex-direction: column; gap: 2px; font-size: 11px; }
  .mvcc-bar { height: 34px; }
  .mvcc-seg { font-size: 9px; line-height: 1.1; }
  .mvcc-verdict-box { padding: 12px; }
  .mvcc-verdict-box #mvcc-verdict { font-size: 0.95rem !important; }
  .mvcc-verdict-box #mvcc-explanation { font-size: 13px !important; }

  .mq-flow { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
  .mq-flow .vis-arrow { display: none; }
  .mq-node,
  .mq-delay,
  .mq-cancel { width: auto; min-width: 0; padding: 10px; }
  .mq-node > div { font-size: 0.8rem; }

  .gc-flow { flex-direction: column; gap: 14px; min-height: 0; }
  .gc-node { width: 100%; }
  .es-doc-item { font-size: 12px; }

  /* ============================ 技术手册 ============================ */
  #view-handbook-container {
    gap: 12px;
    padding: 12px 12px calc(76px + env(safe-area-inset-bottom));
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
  }

  .handbook-card { padding: 16px; border-radius: 14px; }
  .hb-title { font-size: 1rem; line-height: 1.4; }
  .hb-toggle { padding: 6px 10px; min-height: 32px; }
  .handbook-content-box { font-size: 14px; line-height: 1.75; overflow-wrap: anywhere; }
  .handbook-content-box code { overflow-wrap: anywhere; }
  .handbook-content-box pre { font-size: 12px; }
  .handbook-content-box table { font-size: 12px; }
}

@media (max-width: 1024px) {
  .vis-filter-row { gap: 6px; }
  .vis-filter-row .btn { min-height: 36px; }
}

@media (max-width: 1024px) {
  .analysis-drawer {
    scroll-margin-top: calc(56px + env(safe-area-inset-top));
    scroll-margin-bottom: 130px;
  }
}

@media (max-width: 1024px) {
  .vis-flow .vis-arrow {
    font-size: 0;
    transform: none;
  }
  .vis-flow .vis-arrow::after {
    content: '↓';
    font-size: 16px;
    font-weight: 700;
  }
}

@media (max-width: 1024px) {
  /* 模式选择首页 */
  .home-container {
    max-width: 680px;
    padding: 24px 16px 92px;
  }

  .home-hero { margin-bottom: 18px; }
  .home-title { font-size: 26px; line-height: 1.3; }
  .home-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 16px;
  }
  .home-stats span { font-size: 12px; padding: 12px 14px; }
  .home-stats strong { font-size: 22px; }

  .mode-grid { grid-template-columns: 1fr; gap: 12px; }

  .mode-card {
    min-height: 0;
    padding: 20px;
    border-radius: 16px;
    gap: 8px;
  }

  .mode-card-title { font-size: 22px; }
  .mode-card-meta { font-size: 12px; padding-top: 8px; }
  .mode-card-cta { font-size: 14px; margin-top: 6px; }

  .home-banner {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 12px 14px;
  }

  .home-banner-actions { justify-content: flex-end; }

  /* 答题工具条吸顶 */
  .paper-toolbar {
    position: sticky;
    top: calc(52px + env(safe-area-inset-top));
    z-index: 28;
    margin: 0 0 10px;
    padding: 10px 12px;
    background: rgba(17, 24, 39, 0.98);
    backdrop-filter: blur(12px);
  }

  .paper-toolbar-title { font-size: 12px; }
  .paper-toolbar-progress { font-size: 11px; }

  .drawer-paper-summary {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 8px 0 10px;
    margin-bottom: 6px;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    flex-shrink: 0;
  }

  /* 未进入刷题/答题时，隐藏底部“题卡”入口 */
  body:not(.in-quiz) .bottom-tab-btn[data-tab="grid-drawer"] {
    display: none;
  }

  body.modal-open { overflow: hidden; }

  /* 组卷弹窗：移动端底部抽屉 */
  .paper-builder {
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    max-height: 88vh;
    transform: translateY(100%);
    border-radius: 20px 20px 0 0;
    padding: 6px 16px calc(16px + env(safe-area-inset-bottom));
  }

  .paper-builder.open { transform: translateY(0); }
  .paper-builder .drawer-handle { display: block; }
  .paper-builder .drawer-header { margin-bottom: 12px; }

  .builder-select { min-height: 44px; }
  .builder-count-group button { min-height: 42px; font-size: 14px; }

  /* 交卷结果 */
  .exam-result-panel {
    padding: 18px 14px;
    border-radius: 14px;
  }

  .result-score { font-size: 2.4rem; }
  .result-wrong-list { max-height: none; }
  .result-actions .btn { flex: 1; }
}

@media (max-width: 1024px) {
  .study-hint { font-size: 11px; margin: 0 0 8px; }
}

@media (max-width: 1024px) {
  /* 掌握度选择器：刷题模式的主操作，做得足够重 */
  .mastery-picker {
    gap: 8px;
    padding: 14px;
    margin-bottom: 16px;
    border-radius: 14px;
  }

  .mastery-status { font-size: 11px; }
  .mastery-picker-row { gap: 6px; }

  .mastery-chip {
    min-height: 48px;
    padding: 10px 2px;
    font-size: 15px;
    border-radius: 10px;
    border-width: 1.5px;
  }

  .mastery-chip.active::before { font-size: 11px; }

  /* 答案行更醒目 */
  .answer-line {
    display: flex;
    width: 100%;
    justify-content: center;
    padding: 11px 14px;
    font-size: 15px;
    border-radius: 10px;
    margin-bottom: 10px;
  }

  .analysis-drawer {
    padding: 14px;
    font-size: 14px;
    line-height: 1.72;
    border-radius: 10px;
  }

  .analysis-body.clamped { max-height: 260px; }

  /* 刷题进度条 */
  .study-session-bar {
    font-size: 11px;
    padding: 8px 10px;
    border-radius: 10px;
  }

  .study-auto-toggle { font-size: 11px; }

  /* 题卡矩阵的掌握度圆点加大，便于扫视 */
  .mobile-question-grid .grid-num-btn[data-mastery]::after {
    right: 6px;
    bottom: 6px;
    width: 10px;
    height: 10px;
  }
}

@media (max-width: 1024px) {
  /* 顶栏「返回模式」按钮 */
  .mobile-back-btn {
    display: none;
    align-items: center;
    gap: 2px;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--bg-subtle);
    border: 1px solid var(--border-subtle);
    color: var(--accent-cyan);
    font-size: 12px;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
  }

  /* 进入刷题/答题模式后隐藏底部导航，让操作栏独占底部 */
  body.in-quiz .mobile-bottom-bar {
    display: none;
  }

  /* 同时隐藏后，内容底部留白可以收窄 */
  body.in-quiz {
    padding-bottom: 0;
  }

  /* 顶栏出现返回入口 */
  body.in-quiz .mobile-back-btn {
    display: inline-flex;
  }

  body.in-quiz .brand-title {
    font-size: 16px;
  }
}

@media (max-width: 1024px) {
  .study-session-actions { gap: 8px; }
  .study-grid-btn { padding: 5px 12px; font-size: 12px; min-height: 30px; }
}

@media (max-width: 1024px) {
  /* 进度条在窄屏拆成两行，避免挤压 */
  .study-session-bar { flex-direction: column; align-items: stretch; gap: 6px; }
  .study-session-progress { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .study-session-actions { justify-content: space-between; }
}