.tutor-app{display:grid;grid-template-columns:minmax(300px,420px) 1fr;gap:18px;max-width:1360px;margin:0 auto;padding:16px 20px;height:calc(100vh - 66px);min-height:620px}
.stage{display:flex;flex-direction:column;gap:14px;min-height:0}
.tcard{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;display:flex;gap:14px;align-items:center;box-shadow:0 2px 10px #0f2a4a10}
#avatar{width:132px;flex:0 0 132px;border-radius:18px;overflow:hidden;position:relative}
#avatar svg{display:block;width:100%;height:auto}
#avatar.speaking{box-shadow:0 0 0 4px #f2b63299}
#avatar.speaking::after{content:"speaking";position:absolute;bottom:6px;left:50%;transform:translateX(-50%);background:#0f2a4aee;color:#fff;font-size:11px;padding:1px 8px;border-radius:10px}
.eyes{transition:transform .12s}
.tinfo{flex:1;min-width:0}
.tinfo b{display:block;font-size:17px;color:var(--navy)}
.tinfo .tag{font-size:13px;color:var(--muted);margin:2px 0 8px}
.tinfo select{width:100%;padding:7px;border-radius:8px;border:1px solid var(--line);font-size:13.5px;margin-bottom:6px}
.tinfo .row{display:flex;gap:6px;flex-wrap:wrap}
.sbtn{background:#eef3fa;border:1px solid #d5e0ee;color:var(--navy);border-radius:8px;padding:5px 10px;font-size:13px;cursor:pointer}
.sbtn:hover{background:#e1eaf6}
#boardPanel{flex:1;min-height:240px;background:#fbfcf7;border:1px solid var(--line);border-radius:18px;display:flex;flex-direction:column;overflow:hidden;box-shadow:inset 0 0 0 6px #fff}
#boardPanel .bhead{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;border-bottom:1px solid var(--line);font-weight:600;color:var(--navy);font-size:14px;background:#fff}
#board{flex:1;display:flex;align-items:center;justify-content:center;padding:8px;min-height:0}
#board svg{width:100%;height:100%;max-height:100%}
.board-empty{color:var(--muted);text-align:center;padding:20px;font-size:14px}
#boardPanel.big{position:fixed;inset:12px;z-index:60;box-shadow:0 20px 60px #0006}
.chat{display:flex;flex-direction:column;min-height:0;background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden}
.ctrl{padding:10px 12px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:8px}
.ctrl .top{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;font-size:13.5px}
.ctrl select{padding:6px;border-radius:8px;border:1px solid var(--line);font-size:13.5px}
#styles{display:flex;gap:6px;overflow-x:auto;padding-bottom:2px;scrollbar-width:thin}
.chip{white-space:nowrap;border:1px solid var(--line);background:#fff;border-radius:16px;padding:5px 11px;font-size:13px;cursor:pointer;color:var(--ink)}
.chip.on{background:var(--blue);color:#fff;border-color:var(--blue)}
#log{flex:1;overflow-y:auto;padding:16px 18px;scroll-behavior:smooth;background:#fcfdff}
.msg{margin:0 0 14px;max-width:92%}
.msg.user{margin-left:auto}
.msg.user .body{background:var(--blue);color:#fff;border-radius:16px 16px 4px 16px;padding:10px 14px;white-space:pre-wrap}
.msg.assistant .body{background:#fff;border:1px solid var(--line);border-radius:16px 16px 16px 4px;padding:10px 16px;line-height:1.6}
.msg .who{font-size:12px;color:var(--muted);margin:0 0 3px 4px}
.msg .body p{margin:.45em 0}.msg .body ul,.msg .body ol{margin:.4em 0;padding-left:1.3em}.msg .body h4{margin:.6em 0 .3em;color:var(--navy)}
.callout{border-radius:10px;padding:8px 12px!important}
.callout.mnem{background:#f3ecfb;border-left:4px solid #7b4fa0}
.callout.life{background:#eaf6ec;border-left:4px solid #2e7d32}
.callout.tip{background:#fff6dc;border-left:4px solid #e0a100}
.callout.check{background:#e8f0fb;border-left:4px solid var(--blue)}
.board-chip{display:inline-block;margin:6px 0;border:1px dashed var(--blue);background:#f2f6fc;color:var(--blue);border-radius:10px;padding:6px 12px;cursor:pointer;font-size:13.5px}
.typing i{display:inline-block;width:7px;height:7px;margin:0 2px;border-radius:50%;background:#9db0c8;animation:bl 1s infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes bl{0%,100%{opacity:.3}50%{opacity:1}}
.compose{display:flex;gap:8px;padding:10px 12px;border-top:1px solid var(--line);align-items:flex-end;background:#fff}
#q{flex:1;resize:none;border:1px solid var(--line);border-radius:12px;padding:11px 12px;font:inherit;font-size:15px;max-height:160px;min-height:44px}
.ibtn{width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:#fff;font-size:19px;cursor:pointer}
#mic.on{background:#c0392b;color:#fff;border-color:#c0392b;animation:pulse 1.2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 #c0392b66}70%{box-shadow:0 0 0 10px #c0392b00}}
#send{background:var(--blue);color:#fff;border-color:var(--blue);width:auto;padding:0 18px;font-weight:600}
#send:disabled{opacity:.5}
.hello{max-width:640px;margin:20px auto;text-align:center}
.hello h2{margin:0 0 6px}
.ideas{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:14px}
.idea{border:1px solid var(--line);background:#fff;border-radius:18px;padding:8px 14px;cursor:pointer;font-size:14px}
.idea:hover{border-color:var(--blue);color:var(--blue)}
.modal-back{position:fixed;inset:0;background:#0008;z-index:80;display:flex;align-items:center;justify-content:center;padding:16px}
.modal{background:#fff;border-radius:18px;max-width:860px;width:100%;padding:22px;max-height:92vh;overflow:auto}
.pgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin:14px 0}
.pcard{border:1px solid var(--line);border-radius:16px;background:#fff;padding:10px;cursor:pointer;text-align:center;display:flex;flex-direction:column;gap:4px}
.pcard:hover{border-color:var(--blue);box-shadow:0 4px 14px #1f4f8a22}
.pcard .pav{width:100%;max-width:150px;margin:0 auto;border-radius:14px;overflow:hidden}
.pcard span{font-size:13px;color:var(--muted)}
.fine{font-size:12.5px;color:var(--muted)}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#0f2a4a;color:#fff;padding:10px 16px;border-radius:10px;z-index:90;max-width:90vw}
.katex{font-size:1.05em}
@media(max-width:900px){
  .tutor-app{grid-template-columns:1fr;height:auto;padding:10px}
  .stage{order:1}
  .chat{order:2;height:78vh}
  #boardPanel{min-height:260px;max-height:340px}
  #avatar{width:104px;flex-basis:104px}
}
.chat .msg{background:none;padding:0;border-radius:0}

/* v2: Times New Roman 12pt everywhere */
body{font-family:"Times New Roman",Times,serif;font-size:12pt}
button,input,select,textarea{font-family:inherit}