:root {
  --bg: #fafafa;
  --fg: #222;
  --muted: #666;
  --border: #e0e0e0;
  --accent: #4f46e5;
  --highlight: #fef3c7;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--fg); line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.navbar { display: flex; align-items: center; gap: 1.5rem; padding: 0.75rem 2rem; background: #fff; border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; font-size: 1.1rem; }
.nav-links { display: flex; gap: 1rem; }
.nav-secondary { display: contents; }.nav-mobile-only { display:none; }
@media(max-width:600px){.nav-secondary{display:none}.nav-mobile-only{display:flex;flex-direction:column;gap:.7rem}.nav-primary{white-space:nowrap}}
.nav-links a { color: var(--fg); }
.container { max-width: 1100px; margin: 0 auto; padding: 2rem; }

.auth { max-width: 360px; margin: 4rem auto; padding: 2rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; }
.auth form, form { display: flex; flex-direction: column; gap: 0.75rem; }
label { display: flex; flex-direction: column; font-size: 0.9rem; gap: 0.25rem; }
input, select { padding: 0.5rem; border: 1px solid var(--border); border-radius: 4px; font-size: 1rem; }
button, .btn { padding: 0.5rem 1rem; background: var(--accent); color: #fff; border: none; border-radius: 4px; cursor: pointer; font-size: 0.95rem; }
button:hover, .btn:hover { opacity: 0.9; text-decoration: none; }
.btn { display: inline-block; }

.error { color: #dc2626; background: #fef2f2; padding: 0.5rem; border-radius: 4px; }
.success { color: #16a34a; }
.empty { color: var(--muted); padding: 2rem 0; }
.hint { color: var(--muted); font-size: 0.85rem; }

.page-head { display: flex; justify-content: space-between; align-items: center; }
h1 { margin-top: 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.card { padding: 1.5rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; color: var(--fg); }
.card h3 { margin: 0 0 0.5rem; }

.list-item { display: flex; align-items: center; padding: 1rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 0.75rem; }
.profile-switcher { display: flex; gap: .75rem; overflow-x: auto; padding: .25rem 0 1rem; }
.profile-chip { display: flex; flex-direction: column; min-width: 180px; padding: .75rem 1rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; color: var(--fg); }
.profile-chip span { color: var(--muted); font-size: .8rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.profile-chip.active { border-color: var(--accent); box-shadow: 0 0 0 2px #e0e7ff; }
.workbench-profile { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.workbench-profile h2 { margin: 0; }
.workbench-next { display: flex; justify-content: space-between; gap: 1rem; align-items: center; margin-top: 1rem; background: #eef2ff; border-color: #c7d2fe; }
.workbench-next h2 { margin: .15rem 0; }
.eyebrow, .item-kicker { color: var(--accent); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.next-counts { display: flex; gap: 1rem; color: var(--muted); white-space: nowrap; }
.next-counts strong { color: var(--fg); font-size: 1.25rem; }
.workbench-metrics { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: .75rem; margin: 1rem 0; }
.metric-card { padding: .75rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; }
.metric-card strong { display: block; font-size: 1.5rem; }
.metric-card span { color: var(--muted); font-size: .82rem; }
.workbench-stages { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; align-items: start; }
.workbench-stage { min-width: 0; padding: 1rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; }
.stage-header { display: flex; align-items: flex-start; justify-content: space-between; gap: .75rem; margin-bottom: .75rem; }
.stage-header > div { display: flex; gap: .6rem; align-items: flex-start; }
.stage-header h2 { margin: 0; font-size: 1.1rem; }
.stage-number { display: inline-grid; place-items: center; width: 1.7rem; height: 1.7rem; flex: 0 0 1.7rem; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; }
.stage-header form, .item-actions form, .status-bar form { display: inline-flex; flex-direction: row; gap: .5rem; margin: 0; }
.workflow-item { display: flex; justify-content: space-between; align-items: flex-start; gap: .75rem; padding: .85rem 0; border-top: 1px solid var(--border); }
.workflow-item-body { min-width: 0; flex: 1; }
.workflow-item h3 { margin: .15rem 0; font-size: 1rem; }
.workflow-item p { margin: .25rem 0; }
.item-actions { display: flex; flex-direction: column; align-items: stretch; gap: .4rem; flex: 0 0 auto; }
.item-actions .btn { white-space: nowrap; }
.subform { margin-top: .75rem; padding: .75rem; background: #fafafa; border: 1px solid var(--border); border-radius: 6px; }
.brief-preview { max-height: 12rem; overflow: auto; white-space: pre-wrap; background: #f6f6f6; padding: .5rem; border-radius: 4px; }
.brief-materials { padding-left: 1.2rem; margin: .5rem 0; }
.brief-materials li { padding: .25rem 0; }
.workbench-history { margin-top: 1rem; }
.workbench-history > summary { cursor: pointer; color: var(--muted); }
.history-list { margin-top: .5rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; }
.history-item { display: flex; justify-content: space-between; gap: 1rem; padding: .6rem .85rem; border-bottom: 1px solid var(--border); }
.history-item:last-child { border-bottom: 0; }
.history-item span { color: var(--muted); font-size: .85rem; }

.workbench-settings { margin-top: 1rem; }
.workbench-settings > summary { cursor: pointer; padding: .85rem 1rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; color: var(--muted); }
.workbench-settings[open] > summary { border-radius: 8px 8px 0 0; }
.settings-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1rem; margin-top: 1rem; }
.scope-row { display: flex; justify-content: space-between; align-items: center; gap: .75rem; padding: .6rem 0; border-top: 1px solid var(--border); }
.scope-row span { min-width: 0; }
.scope-row small { display: block; color: var(--muted); word-break: break-all; }
.new-profile-panel { margin-top: 1.5rem; }

.manual-form { margin-top: .75rem; }
.manual-form summary { cursor: pointer; color: var(--muted); font-size: .9rem; }
.manual-form[open] summary { margin-bottom: .75rem; }
.theme-scout-actions { margin: .75rem 0; padding: .75rem; background: #fafafa; border: 1px solid var(--border); border-radius: 6px; }
.theme-scout-actions form { display: flex; flex-direction: row; align-items: end; gap: .75rem; }

.theme-card { padding: 1rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 1rem; }
.theme-card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.theme-card h3 { margin: 0; }
.theme-materials { margin: .75rem 0; padding-left: 1.25rem; }
.theme-materials li { padding: .4rem 0; border-bottom: 1px solid var(--border); }
.theme-materials .meta { display: block; }
.theme-add-form { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; align-items: end; gap: .75rem; margin-top: .75rem; }
.theme-add-form label { min-width: 0; }
.theme-add-form select { max-width: 100%; }

.list-item { display: flex; align-items: center; padding: 1rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 0.75rem; }
.list-item a { display: flex; gap: 1rem; align-items: center; color: var(--fg); flex: 1; }
.thumb { width: 56px; height: 56px; border-radius: 4px; object-fit: cover; }
.episode-row { justify-content: space-between; }
.ep-info h3 { margin: 0; font-size: 1rem; }
.meta { color: var(--muted); font-size: 0.85rem; margin: 0.25rem 0 0; }
.ep-actions { display: flex; gap: 0.5rem; }

/* 播放器 */
.player-bar { position: sticky; top: 0; background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; margin-bottom: 1.5rem; z-index: 10; }
.player-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem; }
.player-controls input[type=range] { min-width: 120px; }
.player-controls input[type=range] { flex: 1; }
.time { font-size: 0.85rem; color: var(--muted); min-width: 3rem; }

.source-grid { display: grid; grid-template-columns: 1fr 360px; gap: 1.5rem; }
.transcript-panel { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 1.5rem; max-height: 75vh; overflow-y: auto; }
.transcript .seg { display: inline; cursor: pointer; padding: 2px 0; border-radius: 2px; }
.transcript .seg:hover { background: #f0f0f0; }
.transcript .seg.active { background: var(--highlight); }

.card-panel { display: flex; flex-direction: column; gap: 1.5rem; }
.card-panel section { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.25rem; }
.card-panel h2 { font-size: 1rem; margin: 0 0 0.75rem; }
.chapter, .keypoints li, .quote { padding: 0.5rem 0; border-bottom: 1px solid var(--border); list-style: none; }
.chapter:last-child, .quote:last-child { border-bottom: none; }
.chapter a, .quote { cursor: pointer; }
.ts { color: var(--accent); font-size: 0.8rem; margin-right: 0.25rem; }
.gist { color: var(--muted); font-size: 0.85rem; margin: 0.25rem 0 0; }
.tag { display: inline-block; background: #eef; color: var(--accent); padding: 2px 8px; border-radius: 10px; font-size: 0.8rem; margin: 2px; }
.snippet mark { background: var(--highlight); }
.search-hit { padding: 1rem; background: #fff; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 0.75rem; }
.qa-sources { list-style: none; padding: 0; margin: 0.5rem 0 0; }
.qa-source { padding: 0.4rem 0; border-top: 1px solid var(--border); cursor: pointer; font-size: 0.85rem; color: var(--muted); }
.qa-source:hover { color: var(--accent); background: #f6f6ff; }

/* 处理状态条 */
.status-bar { padding: 1rem 1.25rem; border-radius: 8px; margin-bottom: 1.5rem; display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.status-bar.failed { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }
.status-bar.processing { background: #eff6ff; border: 1px solid #bfdbfe; color: #1e40af; }
.status-bar.pending { background: #f9fafb; border: 1px solid var(--border); color: var(--muted); }
.status-bar .error-detail { flex: 1 1 100%; font-size: 0.85rem; margin: 0.25rem 0 0; word-break: break-all; }
.status-bar .inline { display: inline; margin-left: auto; }
.spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.search-form { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; }
.search-form input { flex: 1; }

@media (max-width: 768px) {
  .source-grid { grid-template-columns: 1fr; }
  .container { padding: 1rem; }
  /* U03：导航在小屏改为纵向堆叠 + 链接换行，消除横向溢出 */
  .navbar { flex-direction: column; align-items: flex-start; gap: 0.5rem; padding: 0.75rem 1rem; }
  .nav-links { flex-wrap: wrap; gap: 0.25rem 0.9rem; }
  /* U03：宽表格在容器内横向滚动，不撑破页面 */
  .container table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
  .theme-card-head, .theme-add-form, .workbench-columns { display: flex; flex-direction: column; align-items: stretch; }
  .workbench-stages, .settings-grid { grid-template-columns: 1fr; }
  .workbench-metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .workbench-profile, .workbench-next { align-items: flex-start; flex-direction: column; }
  .theme-scout-actions form { flex-direction: column; align-items: stretch; }
  .next-counts { white-space: normal; flex-wrap: wrap; }
}

.pagination { display: flex; align-items: center; gap: 1rem; margin-top: 1.5rem; }
.page-info { color: var(--muted); font-size: 0.9rem; }
.btn-secondary { background: #e5e7eb; color: var(--fg); }
.btn-secondary:hover { opacity: 0.8; }
.batch-toolbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem; margin-bottom: 0.75rem; background: #eef2ff; border: 1px solid #c7d2fe; border-radius: 8px; }
.batch-toolbar #batch-count { font-weight: 600; color: var(--accent); }

/* DJ 传输控件（D06）：触控目标 ≥44px、无横向溢出、控件标签可见 */
.dj-controls button,
#dj-autoplay,
#dj-pause,
#dj-prev,
#dj-next,
#dj-stop,
#dj-full {
  min-height: 44px;
  min-width: 44px;
}
#dj-rate {
  min-height: 44px;
}
div[style*="margin: 1rem 0"] {
  flex-wrap: wrap; /* 小屏幕换行，避免横向溢出 */
}

/* ---- U03：移动布局与可访问性 ---- */

/* 触控目标：所有交互控件最小 44×44px（Apple HIG / WCAG 2.5.5） */
@media (max-width: 768px) {
  button, .btn, select, input[type="text"], input[type="email"],
  input[type="password"], input[type="number"], textarea {
    min-height: 44px;
    font-size: 16px; /* 防 iOS 自动缩放 */
  }
  .cards { grid-template-columns: 1fr; }
  .dj-controls, .batch-toolbar, .source-head { flex-wrap: wrap; }
  .panel { padding: 0.75rem; }
  table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}

/* 键盘焦点可见性（WCAG 2.4.7） */
:focus-visible {
  outline: 2px solid var(--accent, #4f46e5);
  outline-offset: 2px;
}
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent, #4f46e5);
  outline-offset: 2px;
}

/* 减少动画偏好（WCAG 2.3.3） */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* 高对比度模式支持 */
@media (prefers-contrast: more) {
  :root { --border: #000; --muted: #333; }
  .meta, .hint { color: #333; }
}

/* 防止长文本溢出 */
pre, code, .digest-block, .workflow-item-body {
  overflow-wrap: break-word;
  word-break: break-word;
}
.article-paragraph {margin:1.8rem auto;max-width:760px;line-height:1.9;overflow-wrap:anywhere;}
.article-evidence pre, .revision-diff pre {white-space:pre-wrap;overflow-wrap:anywhere;}
.revision-diff {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;}
fieldset {min-width:0;margin:1rem 0;}fieldset textarea {width:100%;box-sizing:border-box;}
@media(max-width:600px){.revision-diff{grid-template-columns:1fr;}}
/* Personal learning entry points remain usable on narrow screens. */
.nav-advanced{position:relative}.nav-advanced>div{position:absolute;right:0;z-index:20;background:var(--surface,#fff);border:1px solid #ddd;padding:1rem;min-width:12rem;display:flex;flex-direction:column;gap:.7rem}.panel{margin-block:1rem}select,textarea,input{max-width:100%}.article-evidence pre{white-space:pre-wrap;overflow-wrap:anywhere}.transcript-panel>summary{cursor:pointer;padding:.7rem}.source-grid:has(.transcript-panel:not([open])){grid-template-columns:1fr}.navbar .nav-links{flex-wrap:wrap}.player-controls{flex-wrap:wrap}@media(max-width:600px){.source-grid,.revision-diff{display:block}.container{padding-inline:.75rem}.navbar{align-items:flex-start}.player-bar{position:relative}fieldset{min-width:0}.article-paragraph{overflow-wrap:anywhere}}
/* Preserve native hidden behavior even for flex/grid forms and panels. */
[hidden]{display:none!important}
#audio-player{width:100%}

.listening-shell{margin:.5rem auto;max-width:1160px;padding:.75rem;display:flex;align-items:center;flex-wrap:wrap;gap:.5rem}.listening-shell p,.listening-shell form{flex-basis:100%;margin:.2rem 0}.listening-shell label{display:inline-flex;align-items:center;gap:.3rem}.listening-shell input[type=number]{width:6rem}#source-audio{width:100%}#page-view:focus{outline:none}

/* Voice drafts persist outside view navigation, with bounded text and controls. */
.voice-recorder { background: var(--surface, #fff); border: 1px solid #ddd; border-radius: 8px; padding: 1rem; margin: 1rem auto; }
.voice-recorder button { margin: .2rem .25rem .2rem 0; }
.voice-recorder button:disabled { opacity: .5; cursor: default; }
.voice-recorder pre { white-space: pre-wrap; overflow-wrap: anywhere; }
.voice-recorder input[type="checkbox"] { width: auto; margin-right: .5rem; }