/* StudyTeacher AI — Academic Precision design system
   工作台风格：深林绿主色 + Inter + 克制描边/分层，气质= 可信、谨慎、专业。 */
:root{
  --bg:#f3f4f6; --surface:#ffffff; --surface-2:#f9fafb; --surface-3:#f1f5f4;
  --border:#e5e7eb; --border-strong:#d1d5db;
  --ink:#111827; --text:#374151; --muted:#6b7280; --faint:#9ca3af;
  --primary:#064e3b; --primary-hover:#053e2f; --primary-strong:#003527; --on-primary:#ffffff;
  --primary-ink:#065f46; --primary-tint:#ecfdf5; --primary-tint-2:#d1fae5; --primary-tint-border:#a7f3d0;
  --emerald:#059669;
  --danger:#b91c1c; --danger-bg:#fef2f2; --danger-border:#fecaca;
  --warn:#92400e; --warn-bg:#fffbeb; --warn-border:#fde68a;
  --r-btn:8px; --r-input:8px; --r-card:12px; --r-panel:14px; --r-pill:999px;
  --shadow-card:0 1px 2px rgba(16,24,40,.04),0 1px 3px rgba(16,24,40,.05);
  --shadow-modal:0 16px 48px rgba(16,24,40,.20);
  --font:'Inter','PingFang SC','Microsoft YaHei','Hiragino Sans GB',system-ui,-apple-system,Arial,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;overflow:hidden;font-family:var(--font);background:var(--bg);color:var(--text);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
button,input,textarea,select{font-family:inherit}

/* ---------- Buttons ---------- */
button{border:1px solid transparent;border-radius:var(--r-btn);padding:8px 14px;background:var(--primary);color:var(--on-primary);
  font-weight:600;font-size:13px;cursor:pointer;white-space:nowrap;transition:background .12s ease,border-color .12s ease,box-shadow .12s ease}
button:hover{background:var(--primary-hover)}
button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
button:disabled{opacity:.45;cursor:not-allowed}
.secondary{background:var(--surface);color:var(--text);border:1px solid var(--border-strong)}
.secondary:hover{background:var(--surface-2);border-color:var(--muted)}
.danger{background:var(--danger-bg);color:var(--danger);border:1px solid var(--danger-border)}
.danger:hover{background:#fee2e2}
.tiny{font-size:12px;padding:5px 9px;border-radius:var(--r-btn);font-weight:500}
/* 上传教材是 <label> 而非 <button>，单独给它主按钮样式 */
.primaryBtn{display:inline-flex;align-items:center;gap:6px;border-radius:var(--r-btn);padding:8px 14px;background:var(--primary);
  color:var(--on-primary);font-weight:600;font-size:13px;cursor:pointer;white-space:nowrap;border:1px solid transparent}
.primaryBtn:hover{background:var(--primary-hover)}
.hidden{display:none!important}

/* ---------- Inputs ---------- */
input,textarea,select{border:1px solid var(--border-strong);border-radius:var(--r-input);padding:9px 11px;background:var(--surface);
  color:var(--ink);outline:0;font-size:13px}
textarea{width:100%;min-height:72px;resize:vertical;line-height:1.55}
input::placeholder,textarea::placeholder{color:var(--faint)}
input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(6,78,59,.12)}

/* ---------- App shell ---------- */
.app{height:100vh;display:flex;flex-direction:column}
.topbar{height:46px;min-height:46px;padding:7px 16px;background:var(--surface);border-bottom:1px solid var(--border);
  display:flex;gap:12px;align-items:center}
.brand{display:flex;align-items:center;gap:10px;white-space:nowrap}
.brand b{font-size:15px;color:var(--ink);letter-spacing:-.01em}
.homeLink{font-size:12px;font-weight:600;color:var(--muted);text-decoration:none;padding:4px 10px;border-radius:var(--r-pill);
  border:1px solid var(--border);background:var(--surface-2)}
.homeLink:hover{color:var(--primary-ink);background:var(--primary-tint);border-color:var(--primary-tint-border)}
.brand span{font-size:11px;color:var(--primary-ink);background:var(--primary-tint);padding:3px 9px;border-radius:var(--r-pill);
  font-weight:600;border:1px solid var(--primary-tint-border)}
.badge{margin-left:auto;background:var(--primary);color:var(--on-primary);border-radius:var(--r-pill);padding:4px 11px;font-size:11px;font-weight:600}
.apiStatus{flex:1;min-width:0;padding:6px 10px;border-radius:var(--r-btn);font-size:12px;white-space:nowrap;overflow:hidden;
  text-overflow:ellipsis;background:var(--surface-2);border:1px solid var(--border);color:var(--muted)}
.apiStatus.ok{background:var(--primary-tint);color:var(--primary-ink);border-color:var(--primary-tint-border)}
.apiStatus.warn{background:var(--warn-bg);color:var(--warn);border-color:var(--warn-border)}

.toolbar{height:52px;min-height:52px;padding:8px 16px;background:var(--surface);border-bottom:1px solid var(--border);
  display:flex;gap:8px;align-items:center}
.fileBtn{display:inline-flex;align-items:center}
.fileBtn input{display:none}
.statusText,.scopeText{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.statusText{max-width:30vw}.scopeText{max-width:24vw}

/* ---------- Workspace ---------- */
.workspace{flex:1;min-height:0;display:grid;gap:12px;padding:12px 16px 10px;overflow:hidden}
.threeCol{grid-template-columns:minmax(430px,43%) minmax(360px,35%) minmax(300px,22%)}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-panel);min-height:0;overflow:hidden;
  display:flex;flex-direction:column;box-shadow:var(--shadow-card)}
.panelHeader{min-height:52px;padding:12px 14px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;
  gap:10px;align-items:center;background:var(--surface)}
.panelHeader h2{margin:0;font-size:15px;color:var(--ink);letter-spacing:-.01em}
.panelSub{font-size:12px;color:var(--muted);margin-top:2px}
#progressStatus{font-size:12px;color:var(--primary-ink);font-weight:600;white-space:nowrap}

/* ---------- Reader ---------- */
.readerTools{padding:11px 14px;background:var(--surface-2);border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:8px}
.searchRow{display:grid;grid-template-columns:1fr auto auto;gap:8px;align-items:center}
.searchResults{max-height:96px;overflow:auto;border:1px solid var(--border);border-radius:var(--r-card);padding:8px;background:var(--surface);
  font-size:12px;color:var(--muted)}
.searchHit{padding:8px 10px;border-radius:var(--r-btn);cursor:pointer;border:1px solid var(--border);background:var(--surface);margin-bottom:6px;color:var(--text)}
.searchHit:last-child{margin-bottom:0}
.searchHit:hover{background:var(--primary-tint);border-color:var(--primary-tint-border)}
.searchHit b{color:var(--primary-ink)}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.bookmarkList{min-height:22px;max-height:64px;overflow:auto;font-size:12px;color:var(--muted)}
.bookmarkItem{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 9px;border-radius:var(--r-btn);
  background:var(--surface);border:1px solid var(--border);margin-bottom:5px}
.reader{flex:1;min-height:0;overflow:auto;padding:16px;line-height:1.62;font-size:14px;background:var(--surface);color:var(--text)}
.placeholder{color:var(--faint)}
.docBlock{padding:14px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--surface);margin-bottom:12px;transition:border-color .12s ease}
.docBlock:hover{border-color:var(--primary-tint-border)}
.docBlock.flash{animation:flashBg 1.4s ease}
@keyframes flashBg{0%{background:var(--primary-tint)}100%{background:var(--surface)}}
.blockHead{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:9px}
.blockTitle{color:var(--primary-ink);font-weight:700;font-size:13px}
.blockMeta{font-size:11px;color:var(--muted);margin-top:2px;font-family:var(--mono)}
.blockText{white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word}
.blockActions,.objectActions,.cardActions,.citationActions,.citationSelectActions{display:flex;gap:7px;flex-wrap:wrap;align-items:center}

/* ---------- AI stream ---------- */
.aiStream{flex:1;min-height:0;overflow:auto;background:var(--surface-2);padding:12px}
.streamCard{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);padding:13px;margin-bottom:12px;box-shadow:var(--shadow-card)}
.streamCard.current{border-color:var(--primary-tint-border);border-left:3px solid var(--primary);box-shadow:0 0 0 3px rgba(6,78,59,.06)}
.cardTop{display:flex;justify-content:space-between;gap:10px;align-items:flex-start;margin-bottom:9px}
.cardType{font-weight:700;font-size:14px;color:var(--ink)}
.cardMeta{color:var(--muted);font-size:12px;margin-top:3px;line-height:1.45;overflow-wrap:anywhere}
.cardContext{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-btn);padding:8px 10px;font-size:12px;
  color:var(--muted);max-height:78px;overflow:auto;margin-bottom:10px;white-space:pre-wrap;overflow-wrap:anywhere}
.responseSections{display:flex;flex-direction:column;gap:8px}
.responseSection{border:1px solid var(--border);border-radius:var(--r-card);padding:10px 12px;background:var(--surface)}
.sectionHead{display:flex;justify-content:space-between;gap:8px;align-items:center;margin-bottom:7px}
.responseSection h4{margin:0;font-size:13px;color:var(--primary-ink);font-weight:600}
.responseText{white-space:pre-wrap;font-size:14px;line-height:1.6;color:var(--text);overflow-wrap:anywhere;word-break:break-word}

/* 引用标记：已核实=可点绿色药丸；未核实=灰色虚线 + 小标签，杜绝误导 */
/* 引用用行内高亮而非不换行药丸：长句会跟着正文换行，绝不冲出卡片 */
.citationBtn{display:inline;margin:0 1px;padding:1px 7px;border-radius:8px;background:var(--primary-tint);color:var(--primary-ink);
  border:1px solid var(--primary-tint-border);font-size:12px;font-weight:600;cursor:pointer;line-height:1.85;white-space:normal;
  overflow-wrap:anywhere;-webkit-box-decoration-break:clone;box-decoration-break:clone}
.citationBtn:hover{background:var(--primary-tint-2)}
.citationBtn.verified{background:var(--primary-tint-2);border-color:#6ee7b7}
.quoteUnverified,.citeUnverified{color:var(--muted);border-bottom:1px dashed var(--border-strong);cursor:help;overflow-wrap:anywhere}
.unverifiedTag{display:inline-flex;align-items:center;margin-left:4px;padding:1px 6px;border-radius:var(--r-pill);
  background:var(--warn-bg);color:var(--warn);border:1px solid var(--warn-border);font-size:10px;font-weight:600;white-space:nowrap}

/* ---------- Action panel ---------- */
.actionBody{flex:1;min-height:0;overflow:auto;padding:12px;display:flex;flex-direction:column;gap:11px}
.learningObject{padding:12px;border-radius:var(--r-card);border:1px solid var(--border);border-left:3px solid var(--primary);background:var(--surface)}
.learningObject.empty{border-left-color:var(--border);background:var(--surface-2)}
.objectHeader{display:flex;justify-content:space-between;gap:8px;align-items:flex-start;margin-bottom:9px}
.objectHeader b{color:var(--ink);font-size:14px}
.objectHeader span{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.lockedText{max-height:120px;overflow:auto;padding:9px 11px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--surface-2);
  white-space:pre-wrap;font-size:13px;line-height:1.55;margin-bottom:9px;color:var(--text);overflow-wrap:anywhere;word-break:break-word}
.audioLine{margin-top:2px}
.questionBlock{padding:12px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--surface);display:flex;flex-direction:column;gap:8px}
.questionBlock label{font-weight:600;font-size:13px;color:var(--ink)}
.courseBlock{background:var(--surface-2)}
.hint{color:var(--muted);font-size:12px}
.error{color:var(--danger);background:var(--danger-bg);border:1px solid var(--danger-border);border-radius:var(--r-btn);padding:9px 11px;font-size:13px}
.error:empty{display:none}

/* ---------- Footer ---------- */
.disclaimer{height:32px;min-height:32px;padding:8px 16px;background:var(--ink);color:#d1d5db;font-size:12px;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap;display:flex;align-items:center}

/* ---------- Modals ---------- */
.modalOverlay{position:fixed;inset:0;background:rgba(17,24,39,.5);z-index:1000;display:flex;align-items:center;justify-content:center;padding:22px;backdrop-filter:blur(1px)}
.modalOverlay.hidden{display:none}
.modalOverlay.noShade{background:transparent;pointer-events:none;backdrop-filter:none}
.modalCard{background:var(--surface);border-radius:16px;border:1px solid var(--border);box-shadow:var(--shadow-modal);
  width:min(980px,96vw);max-height:90vh;overflow:hidden;display:flex;flex-direction:column;pointer-events:auto}
.smallModal{width:min(760px,94vw)}
.modalHead{padding:15px 18px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.modalHead h3{margin:2px 0 0;font-size:18px;color:var(--ink);letter-spacing:-.01em}
.smallLabel{color:var(--muted);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.03em}
.modalBody{padding:15px 18px;overflow:auto}
.modalFoot{padding:13px 18px;border-top:1px solid var(--border);display:flex;justify-content:space-between;gap:12px;align-items:center}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid2 label,.modalBody label{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:var(--ink)}
.modalSection{margin:12px 0}
.checkList{border:1px solid var(--border);border-radius:var(--r-card);padding:9px;max-height:150px;overflow:auto;background:var(--surface-2);display:flex;flex-direction:column;gap:6px}
.checkList label{flex-direction:row;align-items:center;font-weight:400;gap:8px;color:var(--text)}
.libraryCard{width:min(1080px,96vw)}
.libraryLayout{flex:1;min-height:0;display:grid;grid-template-columns:230px 1fr;overflow:hidden}
.categoryPane{border-right:1px solid var(--border);padding:13px;overflow:auto;background:var(--surface-2)}
.paneTitle{font-weight:700;font-size:12px;margin:0 0 8px;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
.categoryList{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
.categoryItem{padding:9px 11px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--surface);cursor:pointer;
  display:flex;justify-content:space-between;gap:8px;align-items:center}
.categoryItem:hover{border-color:var(--primary-tint-border)}
.categoryItem.active{background:var(--primary);color:var(--on-primary);border-color:var(--primary)}
.miniForm{display:flex;gap:6px}
.miniForm input{min-width:0;flex:1}
.miniForm.inline{width:min(420px,50%)}
.libraryContent{padding:14px;overflow:auto}
.libraryTop{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:14px}
.libraryTop h4{margin:0;font-size:16px;color:var(--ink)}
.libraryColumns{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.itemList{display:flex;flex-direction:column;gap:8px}
.libraryItem{border:1px solid var(--border);border-radius:var(--r-card);padding:11px;background:var(--surface)}
.libraryItemTitle{font-weight:700;margin-bottom:4px;color:var(--ink)}
.libraryItemMeta{color:var(--muted);font-size:12px;line-height:1.45;margin-bottom:9px}
.packCard{width:min(720px,94vw)}
.packDocs{padding:15px 18px;overflow:auto}

/* ---------- Citation drawer ---------- */
.citationCard{width:min(860px,96vw);position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);max-height:86vh}
.dragHandle{cursor:move;user-select:none}
.citationMeta{font-size:12px;color:var(--muted);margin-top:4px}
.citationOriginal{margin:14px 18px 10px;padding:13px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--surface-2);
  min-height:140px;max-height:250px;overflow:auto;white-space:pre-wrap;line-height:1.6;color:var(--text);overflow-wrap:anywhere;word-break:break-word}
.citationActions,.citationSelectActions{padding:0 18px 10px}
.citationSelectActions span{color:var(--muted);font-size:12px}
.citationGenerated{margin:0 18px 18px;padding:13px;border:1px solid var(--border);border-radius:var(--r-card);min-height:110px;
  max-height:250px;overflow:auto;white-space:pre-wrap;background:var(--surface);color:var(--text);line-height:1.6}
.sourceBadge{display:inline-flex;padding:2px 7px;border-radius:var(--r-pill);background:var(--primary-tint);color:var(--primary-ink);
  border:1px solid var(--primary-tint-border);font-size:11px;font-weight:600}
.warnBadge{display:inline-flex;padding:2px 7px;border-radius:var(--r-pill);background:var(--warn-bg);color:var(--warn);
  border:1px solid var(--warn-border);font-size:11px;font-weight:600}

/* ---------- Responsive ---------- */
@media(max-width:1250px){
  body{overflow:auto}
  .app{height:auto;min-height:100vh}
  .threeCol{grid-template-columns:1fr}
  .workspace{overflow:visible}
  .readerPanel,.streamColumn,.actionPanel{min-height:640px}
  .reader{min-height:420px}.aiStream{min-height:420px}
  .libraryLayout,.libraryColumns,.grid2{grid-template-columns:1fr}
  .disclaimer{position:sticky;bottom:0}
}