:root{--ink:#263c55;--muted:#687889;--line:#dce3e9;--accent:#3567b3;--green:#287460;--bg:#f3f5f7;--red:#ac4148;--amber:#996418}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:#243344;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer;border:1px solid var(--line);border-radius:8px;padding:9px 15px;background:#fff;color:var(--ink)}button:hover{border-color:var(--accent);background:#f3f7fc}button:disabled{opacity:.55;cursor:wait}.primary{background:var(--ink);color:white;border-color:var(--ink)}.primary:hover{background:#365374;color:white}.danger{color:var(--red)}input,select,textarea{width:100%;padding:10px 12px;border:1px solid #ccd6e0;border-radius:8px;background:white;color:inherit}textarea{min-height:120px;resize:vertical}label{display:block;margin:12px 0 6px;font-size:14px;font-weight:600}h1{font-size:27px;line-height:1.3;margin:0 0 10px;letter-spacing:-.6px}h2{font-size:19px;margin:0 0 14px;line-height:1.4}h3{font-size:16px;margin:0 0 10px}p{margin:8px 0 16px}small,.muted{font-size:14px;color:var(--muted)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.shell{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:100vh}.sidebar{background:white;border-right:1px solid var(--line);padding:30px 22px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column}.brand{font-size:23px;font-weight:750;letter-spacing:2px;color:var(--ink)}.brand small{display:block;font-size:12px;letter-spacing:2px;font-weight:500;margin-bottom:28px}.nav{display:flex;flex-direction:column;gap:6px}.nav a{padding:10px 13px;border-radius:8px;color:var(--muted);font-size:15px}.nav a.active{background:#edf2f8;color:var(--ink);font-weight:650}.account{margin-top:auto;border-top:1px solid var(--line);padding-top:15px;font-size:14px}.main{padding:34px 40px;max-width:1320px;width:100%;margin:0 auto;align-self:start}.page-head{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px}.page-head p{margin:0}.card{background:white;border:1px solid var(--line);border-radius:13px;padding:23px;margin-bottom:20px;min-width:0}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.grid .card{margin-bottom:0}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:24px}.stat{padding:20px;background:white;border:1px solid var(--line);border-radius:12px}.stat strong{display:block;font-size:30px;line-height:1.4;margin:5px 0}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.between{justify-content:space-between}.toolbar{display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap;margin-bottom:20px}.toolbar>div{min-width:140px;flex:1}.toolbar label{margin-top:0}.badge{display:inline-block;border-radius:5px;background:#edf2f8;color:var(--ink);padding:2px 8px;font-size:13px;white-space:nowrap}.badge.green{background:#eaf5ef;color:var(--green)}.badge.amber{background:#fcf3e3;color:var(--amber)}.badge.red{background:#f9ecee;color:var(--red)}.notice{padding:12px 16px;border-radius:8px;background:#f8f3e6;border-left:3px solid #d1b56d;font-size:14px;margin-bottom:20px}.empty{padding:34px 10px;text-align:center;color:var(--muted)}.list-item{padding:15px 0;border-bottom:1px solid var(--line)}.list-item:last-child{border-bottom:0}.list-item h3{margin:3px 0}.progress{height:6px;background:#e8edf1;border-radius:3px;overflow:hidden}.progress>span{display:block;height:100%;background:var(--accent);width:var(--pct)}.question{font-size:19px;line-height:1.7;white-space:pre-wrap;margin:16px 0 22px}.option{display:flex;align-items:flex-start;gap:12px;padding:13px 16px;border:1px solid var(--line);border-radius:9px;margin:10px 0;font-size:16px;font-weight:400;cursor:pointer}.option:has(input:checked){border-color:var(--accent);background:#eef4fd}.option input{width:18px;height:18px;margin:5px 0 0;flex-shrink:0}.result{border-left:3px solid var(--green);padding:15px 20px;background:#f0f7f4;margin-top:20px}.result.wrong{border-color:var(--red);background:#fbf3f3}.analysis{white-space:pre-wrap;font-size:16px;overflow-wrap:anywhere}.source{border-top:1px solid var(--line);padding-top:10px;margin-top:14px;font-size:14px;color:var(--muted);white-space:pre-wrap;overflow-wrap:anywhere}.exam-head{position:sticky;top:0;background:var(--bg);z-index:5;padding:12px 0}.timer{font-size:22px;font-variant-numeric:tabular-nums;font-weight:700;color:var(--ink)}.exam-grid{display:grid;grid-template-columns:minmax(0,1fr) 210px;gap:20px}.numbers{display:flex;gap:8px;flex-wrap:wrap}.numbers button{width:36px;padding:5px 0}.numbers button.done{background:#eaf5ef;border-color:#9cc9ba}.numbers button.active{background:var(--ink);color:white}.side-card{position:sticky;top:105px;align-self:start}.save-status{font-size:14px;margin:8px 0;color:var(--muted)}.save-status.error{color:var(--red)}.grade-line{display:grid;grid-template-columns:minmax(0,1fr) 90px;gap:12px;align-items:center;padding:10px 0}.grade-line input{padding:7px}.login{max-width:420px;margin:10vh auto;padding:32px}.login h1{font-size:30px}.login button{width:100%;margin-top:20px}.login .brand{margin-bottom:22px}.loading{padding:80px;text-align:center;color:var(--muted)}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);z-index:20;background:#25374b;color:white;border-radius:9px;padding:11px 20px;max-width:90vw;display:none;box-shadow:0 4px 25px #0002}details{border-top:1px solid var(--line);padding-top:12px;margin-top:15px}summary{cursor:pointer;color:var(--muted);font-size:14px}.code{font-family:ui-monospace,monospace;font-size:14px;min-height:280px}.document-text{max-height:420px;overflow:auto;white-space:pre-wrap}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:14px}td,th{padding:11px 8px;border-bottom:1px solid var(--line);text-align:left}th{color:var(--muted)}.stack{margin-top:20px}.error-box{padding:20px;background:#fff1f1;border:1px solid #e8bebe;border-radius:10px}.menu-toggle{display:none}@media(min-width:1500px){.main{padding:40px 50px}}@media(max-width:1000px){.main{padding:28px 24px}.shell{grid-template-columns:180px minmax(0,1fr)}.sidebar{padding:25px 15px}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.exam-grid{grid-template-columns:minmax(0,1fr)}.side-card{position:static}.grid{grid-template-columns:minmax(0,1fr)}}@media(max-width:650px){.shell{display:block}.sidebar{position:sticky;height:auto;top:0;padding:12px 16px;z-index:10;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:20px}.brand small,.account{display:none}.nav{flex-direction:row;overflow:auto;gap:4px;margin-top:8px}.nav a{white-space:nowrap;padding:6px 10px;font-size:14px}.main{padding:20px 16px}.page-head{align-items:flex-start;flex-wrap:wrap;margin-bottom:18px}h1{font-size:23px}.card{padding:18px;border-radius:10px}.stats{gap:10px}.stat{padding:14px}.stat strong{font-size:26px}.toolbar>div{min-width:120px}.login{margin:6vh 16px;padding:26px}.exam-head{top:101px;padding:8px 0}.question{font-size:17px}.option{padding:12px}.timer{font-size:19px}.grade-line{grid-template-columns:minmax(0,1fr) 80px}.loading{padding:35px}}

progress{width:100%;height:7px;accent-color:var(--accent);border:0;margin-top:9px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.form-grid .wide{grid-column:1/-1}@media(max-width:650px){.form-grid{grid-template-columns:1fr}.form-grid .wide{grid-column:auto}}

.delete-dialog{border:1px solid var(--line);border-radius:14px;max-width:530px;width:calc(100% - 32px);padding:26px;color:var(--ink);box-shadow:0 20px 70px #0003}.delete-dialog::backdrop{background:#1c2c3c66}.delete-dialog p{overflow-wrap:anywhere}

.reading-option{padding:12px 15px;margin:9px 0;border:1px solid var(--line);border-radius:8px;overflow-wrap:anywhere}.reading-option.answer-correct{background:#eaf5ef;border-color:#9cc9ba}.answer-label{font-size:12px;color:var(--green);margin-left:12px;white-space:nowrap}.reading-answer{margin-top:18px;padding:16px;background:#f5f8fb;border-radius:8px}.reading-toolbar>div:last-child{flex:3}.reading-toolbar select{min-width:0}.reading-answer .analysis{font-size:15px}

/* ---------- 0.2.0: AI 老师、重点清单、多账号 ---------- */
.tabbar{display:none}
.tiny{padding:5px 10px;font-size:13px;border-radius:7px}
.small{font-size:13px}
.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.pwd{display:inline-block;margin:6px 0;padding:6px 10px;background:#0f1d2b;color:#e8f1f8;border-radius:6px;font-family:ui-monospace,monospace;font-size:15px;letter-spacing:.5px}
.ai-actions{margin-top:6px}
.ai-drawer{position:fixed;top:0;right:0;bottom:0;width:min(440px,100%);background:#fff;border-left:1px solid var(--line);z-index:32;display:flex;flex-direction:column;box-shadow:-10px 0 40px #0d1b2a1f}
.ai-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 18px;border-bottom:1px solid var(--line)}
.ai-head small{display:block;margin-top:2px}
.ai-close{border:0;background:transparent;font-size:18px;padding:6px 10px;color:var(--muted)}
.ai-range{padding:10px 18px;background:#f7f9fb;border-bottom:1px solid var(--line);font-size:13px}
.ai-toggle{display:flex;align-items:center;gap:8px;margin:0;font-size:13px;font-weight:500}
.ai-toggle input{width:18px;height:18px;flex:0 0 auto}
.ai-log{flex:1;overflow:auto;padding:14px 16px;display:flex;flex-direction:column;gap:10px;background:var(--bg)}
.ai-msg{max-width:94%;padding:11px 14px;border-radius:12px;font-size:15px;line-height:1.65;overflow-wrap:anywhere}
.ai-msg p{margin:0 0 8px}
.ai-msg p:last-child{margin-bottom:0}
.ai-msg ul{margin:4px 0 8px;padding-left:20px}
.ai-msg h2,.ai-msg h3,.ai-msg h4{margin:10px 0 6px;font-size:15px}
.ai-msg.user{align-self:flex-end;background:var(--ink);color:#fff;white-space:pre-wrap}
.ai-msg.bot{align-self:flex-start;background:#fff;border:1px solid var(--line)}
.ai-msg.err{background:#fbf3f3;border-color:#e8bebe;color:var(--red)}
.ai-cite{font-size:12px;color:var(--muted);padding:0 18px 6px;background:#fff}
.ai-quick{display:flex;gap:8px;flex-wrap:wrap;padding:10px 16px;border-top:1px solid var(--line);background:#fff}
.ai-quick button{font-size:13px;padding:7px 12px}
.ai-form{display:flex;gap:8px;align-items:flex-end;padding:10px 16px calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--line);background:#fff}
.ai-form textarea{min-height:46px;max-height:120px;margin:0;resize:vertical;font-size:15px}
.ai-grade{margin-top:4px}
.ai-grade table{margin:8px 0}
.ai-grade td{vertical-align:top}
.note-dialog{border:1px solid var(--line);border-radius:14px;max-width:760px;width:calc(100% - 28px);padding:24px;color:var(--ink);box-shadow:0 24px 80px #0d1b2a33;max-height:88vh;overflow:auto}
.note-dialog::backdrop{background:#16283acc}
.note-dialog h2{margin-top:0}
.note-body{margin:14px 0;font-size:15px;line-height:1.75}
.note-body h2{font-size:18px;margin:18px 0 8px}
.note-body h3{font-size:16px;margin:14px 0 6px}
.note-body ul{padding-left:20px}
.note-body code{background:#eef2f7;padding:1px 5px;border-radius:4px}
.conn-item{border-top:1px solid var(--line);padding:12px 0;display:flex;flex-direction:column;gap:8px}
.conn-item:first-child{border-top:0}
.conn-item select{max-width:320px}
.cand-list{margin-top:12px}
@media(max-width:900px){
  .shell{display:block}
  .sidebar{display:none}
  .main{padding:16px 14px 92px;max-width:none}
  .tabbar{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:26;background:#fff;border-top:1px solid var(--line);padding:6px 6px calc(6px + env(safe-area-inset-bottom))}
  .tabbar a{display:flex;align-items:center;justify-content:center;min-height:48px;border-radius:10px;color:var(--muted);font-size:14px;text-decoration:none}
  .tabbar a.active{background:#edf2f8;color:var(--ink);font-weight:650}
  button,.tabbar a{min-height:44px}
  button{padding:11px 15px}
  .option{padding:14px 15px;gap:10px}
  .numbers button{width:46px;height:46px}
  .toolbar>div{min-width:100%}
  .exam-head{top:0}
  .page-head h1{font-size:22px}
  .ai-head{padding:14px 16px}
}
@media(max-width:650px){
  .ai-drawer{top:auto;height:86vh;width:100%;border-left:0;border-top:1px solid var(--line);border-radius:16px 16px 0 0;box-shadow:0 -10px 40px #0d1b2a26}
  .ai-msg{max-width:100%}
  .note-dialog{padding:18px}
}
.tabbar{grid-template-columns:repeat(6,1fr)}
.tabbar button{border:0;background:transparent;color:var(--muted);font-size:14px;min-height:48px;border-radius:10px}
.tabbar button.active{background:#edf2f8;color:var(--ink);font-weight:650}
.more-sheet{position:fixed;inset:0;background:#0d1b2a55;z-index:34;display:flex;align-items:flex-end}
.more-sheet-body{background:#fff;width:100%;border-radius:16px 16px 0 0;padding:16px 16px calc(16px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:4px}
.more-sheet-body h3{margin:0 0 6px;font-size:15px;color:var(--muted)}
.more-sheet-body a{padding:14px 10px;border-radius:10px;font-size:16px;color:var(--ink);text-decoration:none;min-height:48px;display:flex;align-items:center}
.more-sheet-body a:hover,.more-sheet-body a:active{background:#f2f6fa}
.more-sheet-body button{margin-top:6px}
.ai-form button{flex:0 0 auto;white-space:nowrap;min-width:78px}