:root{--bg:#f4f6f5;--surface:#fff;--surface2:#eef3f1;--ink:#18332f;--muted:#6c7f78;--line:#dfe7e2;--accent:#087769;--accent2:#e8f4ef;--warm:#e9ad61;--danger:#b33b43;--radius:19px;--shadow:0 12px 38px #193c2e07;--ui-font:15px;--reading-font:18px;font-family:"Segoe UI","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none;color-scheme:light}
*{box-sizing:border-box}body{margin:0;font-size:var(--ui-font);line-height:1.6}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-color:var(--accent)}button{cursor:pointer;border:0}button:disabled{opacity:.45;cursor:not-allowed}a{color:var(--accent);text-underline-offset:3px}h1,h2,h3,h4,p{margin-top:0}h1{font-size:30px;line-height:1.4;letter-spacing:-.8px;margin-bottom:12px}h2{font-size:22px;line-height:1.45;margin-bottom:16px}h3{font-size:17px;margin-bottom:8px}h4{font-size:15px}p{margin-bottom:12px}small,.small{font-size:12px}strong{font-weight:650}button:focus-visible,a:focus-visible{outline:3px solid #e1ab57;outline-offset:3px}input,select,textarea{width:100%;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:11px 12px;min-width:0}textarea{resize:vertical;line-height:1.6;min-height:100px}label{display:block;font-size:13px;font-weight:600}label>input,label>select,label>textarea{margin-top:6px}input[type=checkbox],input[type=radio]{width:auto;accent-color:var(--accent)}pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px}code{font-size:.87em;word-break:break-all}.muted{color:var(--muted)}.accent{color:var(--accent)}.danger{color:var(--danger)}.eyebrow{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:12px}.brand{display:flex;align-items:center;gap:12px}.brand img{width:43px;height:43px}.brand b{font-size:21px;letter-spacing:1px;display:block;line-height:1.3}.brand span{font-size:10px;letter-spacing:1px;color:var(--muted)}.btn{border-radius:10px;padding:11px 18px;font-weight:600;display:inline-flex;gap:8px;align-items:center;justify-content:center;background:var(--surface2);color:var(--ink);white-space:normal}.btn.primary{background:var(--accent);color:white}.btn.dark{background:#183b34;color:white}.btn.outline{background:transparent;border:1px solid var(--line)}.btn.danger{background:#faeceb;color:var(--danger)}.btn.small{font-size:12px;padding:7px 11px}.btn.link{padding:4px 0;background:transparent;color:var(--accent)}.btn:hover{filter:brightness(.96);transform:translateY(-1px)}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.row.between{justify-content:space-between}.stack{display:grid;gap:18px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px}.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:23px;box-shadow:var(--shadow);min-width:0}.panel.flat{box-shadow:none}.tag{display:inline-flex;align-items:center;gap:5px;border-radius:6px;padding:3px 8px;font-size:11px;font-weight:600;background:var(--surface2);color:var(--muted)}.tag.green{background:var(--accent2);color:var(--accent)}.tag.amber{background:#fff1dc;color:#8a5b20}.tag.red{background:#fbecec;color:var(--danger)}.notice{padding:13px 16px;border:1px solid var(--line);border-radius:12px;background:var(--surface2);font-size:13px;color:var(--muted);overflow-wrap:anywhere}.notice.warning{background:#fff8ed;border-color:#f0ddba;color:#815b22}.notice.error{background:#fff1f0;border-color:#ebc7c4;color:#a23a38}.empty{padding:35px 24px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:16px}.empty h3{color:var(--ink)}.empty svg{width:48px;height:48px;margin-bottom:10px;stroke:var(--accent)}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.field-grid .full{grid-column:1/-1}.spacer{height:16px}.divider{height:1px;background:var(--line);margin:20px 0}.boot{height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center}.boot img{margin-bottom:18px}
/* App chrome */
.shell{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:100vh}.sidebar{background:var(--surface);border-right:1px solid var(--line);height:100vh;position:sticky;top:0;display:flex;flex-direction:column;padding:29px 18px 18px}.sidebar .brand{padding:0 10px;margin-bottom:32px}.nav-label{font-size:10px;letter-spacing:2px;color:var(--muted);padding:0 15px;margin:16px 0 8px}.nav{display:grid;gap:5px}.nav button{display:flex;align-items:center;gap:12px;width:100%;padding:13px 15px;border-radius:11px;text-align:left;background:none;color:var(--muted);font-size:14px}.nav svg{width:19px;height:19px;flex:none}.nav button.active{background:var(--accent2);color:var(--accent);font-weight:650}.nav button:hover{background:var(--surface2);color:var(--ink)}.sidebar-bottom{margin-top:auto}.sidebar-tip{background:var(--bg);border-radius:14px;padding:16px;font-size:12px;line-height:1.8;color:var(--muted);margin:20px 3px}.sidebar-tip b{color:var(--ink);display:block;margin-bottom:6px}.main{min-width:0}.topbar{height:86px;display:flex;align-items:center;justify-content:space-between;padding:0 36px;gap:20px;border-bottom:1px solid var(--line);background:var(--surface)}.breadcrumbs{font-size:13px;color:var(--muted)}.top-right{display:flex;align-items:center;gap:18px}.level-switch{display:flex;padding:4px;border-radius:10px;background:var(--surface2);gap:4px}.level-switch button{padding:7px 14px;border-radius:7px;background:transparent;color:var(--muted);font-weight:600;font-size:12px}.level-switch button.active{color:var(--accent);background:var(--surface);box-shadow:0 2px 8px #153b2710}.avatar{width:35px;height:35px;border-radius:50%;background:#f3e5ce;color:#7c5c36;display:grid;place-items:center;font-size:14px;font-weight:700}.connection{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:6px}.connection::before{content:'';width:6px;height:6px;background:var(--accent);border-radius:50%}.content{padding:30px 36px 55px;max-width:1680px;margin:0 auto}.page-head{display:flex;gap:20px;align-items:center;justify-content:space-between;margin-bottom:24px}.page-head p{color:var(--muted);font-size:13px;margin:0}.page-head h1{font-size:26px;margin-bottom:7px}.footer-note{margin-top:25px;font-size:11px;color:var(--muted);text-align:center;letter-spacing:.2px}
/* Auth */
.auth{min-height:100vh;display:grid;grid-template-columns:1.04fr 1fr;background:var(--surface)}.auth-story{background:#103d35;color:#f4faf7;padding:48px clamp(36px,6vw,96px);display:flex;flex-direction:column;position:relative;overflow:hidden}.auth-story .brand span{color:#abc9be}.auth-story h1{font-size:clamp(34px,3.5vw,54px);font-weight:600;line-height:1.45;margin:58px 0 22px;position:relative;z-index:1}.auth-story p{max-width:400px;color:#b9cfc6;font-size:15px;line-height:1.9;position:relative;z-index:1}.auth-route{margin:30px 0 24px;display:grid;gap:12px;max-width:460px}.route-step{display:flex;align-items:center;gap:18px;padding:15px 20px;border:1px solid #52857666;border-radius:13px;background:#1b4c43}.route-step:nth-child(2){margin-left:25px}.route-step:nth-child(3){margin-left:50px}.route-step i{font-style:normal;font-size:13px;background:#426a60;color:#cee4db;border-radius:8px;width:32px;height:32px;display:grid;place-items:center}.route-step:last-child i{background:#eabd78;color:#3b3826}.route-step b{font-size:14px;font-weight:550}.auth-bottom{margin-top:auto;font-size:11px;color:#abc5ba;letter-spacing:.7px;padding-top:25px}.auth-form-wrap{display:grid;place-items:center;padding:40px}.auth-form{max-width:415px;width:100%}.auth-form h2{font-size:28px;margin-bottom:10px}.auth-form .intro{color:var(--muted);font-size:14px;margin-bottom:27px}.auth-tabs{display:flex;gap:25px;border-bottom:1px solid var(--line);margin-bottom:22px}.auth-tabs button{background:none;padding:8px 0 12px;color:var(--muted);border-bottom:2px solid transparent}.auth-tabs button.active{border-color:var(--accent);color:var(--accent);font-weight:600}.auth-form form{display:grid;gap:16px}.auth-form .btn.primary{width:100%;padding:13px;margin-top:3px}.auth-status{min-height:24px;font-size:12px;color:var(--muted)}
/* Learning */
.hero{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:24px;background:linear-gradient(118deg,#e6f1eb,#f3f5ee);border:1px solid #d2e2d8;border-radius:22px;padding:32px;margin-bottom:23px;position:relative;overflow:hidden}.hero h1{font-size:31px}.hero p{font-size:14px;color:#657b6c;max-width:540px;line-height:1.9}.hero .eyebrow{color:#5e8070}.hero-art{display:flex;align-items:center;justify-content:center;position:relative}.orbit{border:1px dashed #a0beac;border-radius:50%;width:190px;height:190px;display:grid;place-items:center;transform:rotate(-12deg)}.orbit-inner{width:145px;height:145px;background:#fcfffacc;border:9px solid #dce9dd;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;transform:rotate(12deg);box-shadow:0 13px 30px #3852420a}.orbit-inner strong{font-size:41px;line-height:1.2;font-weight:600;color:#235640}.orbit-inner span{font-size:11px;color:#668071;margin-top:6px}.orbit-dot{position:absolute;background:#eabc7c;width:18px;height:18px;border:4px solid #f6f5e8;border-radius:50%;top:20px;right:40px}.stat{padding:20px 23px}.stat-head{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px}.stat-head svg{width:18px;height:18px;color:#94a99e}.stat-number{font-size:31px;font-weight:600;line-height:1.3;margin:12px 0 5px;letter-spacing:-1px}.stat-number small{font-size:12px;font-weight:400;letter-spacing:0;color:var(--muted);margin-left:6px}.stat-note{font-size:11px;color:var(--muted)}.home-bottom{display:grid;grid-template-columns:1.08fr 1fr;gap:22px;margin-top:23px}.task{display:flex;gap:16px;align-items:center;padding:17px 0;border-bottom:1px solid var(--line)}.task:last-child{border-bottom:0;padding-bottom:0}.task-icon{width:41px;height:41px;background:var(--accent2);color:var(--accent);border-radius:11px;display:grid;place-items:center;flex:none}.task-icon svg{width:19px;height:19px}.task .grow{flex:1;min-width:0}.task h4{margin:0 0 4px}.task p{font-size:12px;color:var(--muted);margin:0}.skill-row{display:grid;grid-template-columns:88px minmax(40px,1fr) 60px;gap:12px;align-items:center;font-size:12px;padding:11px 0}.skill-track{height:6px;background:var(--surface2);border-radius:6px;overflow:hidden}.skill-fill{height:100%;border-radius:6px;background:#73a492}.skill-value{text-align:right;color:var(--muted);font-size:11px}.bar-chart{height:170px;display:flex;align-items:flex-end;gap:9px;border-bottom:1px solid var(--line);padding-top:18px}.bar-col{flex:1;min-width:0;height:100%;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:6px}.bar{width:min(32px,85%);background:#8eb5a6;border-radius:6px 6px 0 0;min-height:0;position:relative}.bar-label{font-size:10px;color:var(--muted)}.year-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:11px}.year-card{display:block;border:1px solid var(--line);border-radius:12px;padding:13px;cursor:pointer;background:var(--surface)}.year-card:has(input:checked){background:var(--accent2);border-color:#8fb6a5}.year-card span{display:flex;justify-content:space-between}.year-card small{display:block;font-weight:400;color:var(--muted);margin-top:6px;font-size:10px}.paper-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.paper-card{border:1px solid var(--line);border-radius:15px;padding:19px;background:var(--surface)}.paper-card h3{font-size:15px;margin:12px 0}.paper-card p{font-size:12px;color:var(--muted)}.mode-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mode-card{position:relative;padding:25px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}.mode-card svg{width:28px;height:28px;stroke:var(--accent);margin-bottom:22px}.mode-card h3{font-size:19px}.mode-card p{font-size:13px;color:var(--muted);min-height:61px}.mode-card .btn{width:100%;margin-top:12px}
/* Study room */
.study-banner{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:18px}.study-banner h1{font-size:23px;margin:0}.timer{font-size:22px;letter-spacing:2px;font-variant-numeric:tabular-nums;color:var(--accent)}.study-tools{display:flex;gap:13px;align-items:center}.study-tools button{padding:5px 10px;border:1px solid var(--line);background:var(--surface);border-radius:8px;color:var(--ink)}.group-tabs{display:flex;gap:8px;overflow-x:auto;padding:0 0 15px}.group-tab{flex:none;padding:9px 16px;border-radius:9px;background:var(--surface);border:1px solid var(--line);color:var(--muted);font-size:12px}.group-tab.active{color:var(--accent);background:var(--accent2);border-color:#aac8b9}.study-room{display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,.88fr);gap:18px;align-items:start}.reading-panel{position:sticky;top:20px;max-height:calc(100vh - 105px);overflow:auto}.source-line{display:flex;flex-wrap:wrap;gap:7px;font-size:11px;color:var(--muted);margin-bottom:17px}.passage{white-space:pre-wrap;overflow-wrap:anywhere;font-family:Georgia,"Times New Roman","Microsoft YaHei",serif;font-size:var(--reading-font);line-height:1.95;color:var(--ink)}.question{border:1px solid var(--line);border-radius:15px;padding:20px;background:var(--surface);margin-bottom:15px}.question-number{color:var(--accent);font-size:11px;font-weight:700;letter-spacing:1px;margin-bottom:10px}.question-prompt{font-family:Georgia,"Times New Roman","Microsoft YaHei",serif;font-size:var(--reading-font);line-height:1.65;white-space:pre-wrap;margin-bottom:18px;overflow-wrap:anywhere}.options{display:grid;gap:10px}.option{width:100%;display:flex;align-items:flex-start;gap:12px;border:1px solid var(--line);border-radius:10px;padding:13px 14px;background:var(--surface);text-align:left;color:var(--ink);font-size:calc(var(--reading-font) - 2px);line-height:1.6}.option .letter{width:24px;height:24px;border:1px solid var(--line);border-radius:6px;display:grid;place-items:center;flex:none;font-family:inherit;font-size:12px}.option.selected{border-color:var(--accent);background:var(--accent2)}.option.selected .letter{color:#fff;border-color:var(--accent);background:var(--accent)}.option.correct{border-color:var(--accent);background:var(--accent2)}.option.wrong{border-color:#d68183;background:#fff2f0}.option:hover{border-color:#9abcac}.subjective{font-size:var(--reading-font);min-height:230px}.study-footer{position:sticky;bottom:0;z-index:4;background:var(--surface);border:1px solid var(--line);box-shadow:0 -7px 22px #17362707;border-radius:13px;padding:15px 19px;margin-top:18px;display:flex;justify-content:space-between;align-items:center;gap:13px}.answer-map{display:flex;gap:5px;flex-wrap:wrap;max-width:65%}.answer-dot{width:27px;height:27px;display:grid;place-items:center;border:1px solid var(--line);border-radius:6px;font-size:10px;background:var(--surface);color:var(--muted)}.answer-dot.done{background:var(--accent2);color:var(--accent);border-color:#a7c9b8}.audio-box{padding:16px;background:var(--surface2);border-radius:13px;margin:14px 0}.audio-box audio{width:100%;height:38px;margin-top:9px}.audio-box .row select{width:105px;padding:5px 9px}.feedback-card{border-left:3px solid var(--accent);padding:12px 17px;background:var(--accent2);border-radius:0 10px 10px 0;font-size:13px;white-space:pre-wrap}.feedback-card.wrong{border-color:var(--danger);background:#fff2f0;color:#8d4844}.result-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:17px;overflow:hidden;margin:22px 0}.result-summary>div{padding:22px;background:var(--surface);text-align:center}.result-summary strong{font-size:28px;display:block}.result-summary span{font-size:12px;color:var(--muted)}
/* Administration */
.admin-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:23px}.admin-tabs button{padding:9px 16px;border-radius:9px;font-size:12px;background:var(--surface);border:1px solid var(--line);color:var(--muted)}.admin-tabs button.active{color:#fff;background:var(--accent);border-color:var(--accent)}.pipeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.pipeline-step{padding:19px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}.pipeline-step .no{font-size:24px;color:#a4bfb1;font-weight:600;display:block;margin-bottom:10px}.pipeline-step h3{font-size:14px}.pipeline-step p{font-size:12px;color:var(--muted);margin:0}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px;background:var(--surface)}table{width:100%;border-collapse:collapse;text-align:left;font-size:12px}th{background:var(--surface2);color:var(--muted);font-weight:550;padding:12px 16px;white-space:nowrap}td{padding:14px 16px;border-top:1px solid var(--line);vertical-align:middle}td.path-cell{max-width:360px;overflow-wrap:anywhere}td .btn{white-space:nowrap}tr:hover td{background:var(--bg)}.source-controls{display:flex;flex-wrap:wrap;align-items:end;gap:13px;margin-bottom:17px}.source-controls label{width:150px}.source-controls label.wide{width:310px}.source-controls .btn{margin-bottom:1px}.upload-zone{display:block;border:1px dashed #9bbcac;border-radius:14px;background:var(--accent2);padding:22px;font-size:13px;color:var(--muted);text-align:center;cursor:pointer}.upload-zone input{margin-top:10px;border:0;background:transparent}.editor-head{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:12px}.editor-workspace{display:grid;grid-template-columns:230px minmax(0,1fr) minmax(260px,.8fr);gap:17px;align-items:start;margin-top:20px}.editor-nav{padding:14px;position:sticky;top:20px;max-height:80vh;overflow:auto}.editor-nav button{display:block;text-align:left;width:100%;padding:9px 10px;background:none;border-radius:8px;font-size:12px;color:var(--muted);margin-bottom:4px;overflow-wrap:anywhere}.editor-nav button.active{background:var(--accent2);color:var(--accent)}.editor-form{padding:20px}.editor-form label{margin-bottom:12px}.editor-form textarea{min-height:92px}.editor-original{position:sticky;top:20px;padding:17px}.original-text{max-height:64vh;overflow:auto;background:var(--bg);padding:13px;border-radius:9px;font-size:12px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}.editor-options{display:grid;gap:9px}.editor-option{display:grid;grid-template-columns:30px 1fr;gap:8px;align-items:start}.editor-option b{padding-top:8px;color:var(--accent)}.editor-option textarea{min-height:56px;margin:0}.json-editor{font-family:Consolas,monospace;font-size:12px;min-height:470px;white-space:pre}.issue-item{border:1px solid var(--line);border-radius:13px;padding:20px;margin-bottom:12px;background:var(--surface)}.inline-check{display:flex;align-items:flex-start;gap:10px;font-size:13px}.inline-check input{margin-top:5px;flex:none}.quality-errors{padding:12px 16px;border-radius:11px;background:#fff2ef;color:#9b4a40;font-size:12px}.quality-errors p{margin:3px 0}.grade-response{white-space:pre-wrap;padding:17px;background:var(--bg);border-radius:11px;line-height:1.9;font-family:Georgia,serif;font-size:17px}
#toast{position:fixed;right:25px;top:96px;pointer-events:none;z-index:100;background:#183b34;color:#fff;max-width:min(460px,90vw);border-radius:13px;padding:14px 20px;box-shadow:0 10px 30px #0002;font-size:13px;display:none;overflow-wrap:anywhere}#toast.show{display:block}#toast.error{background:#8d3d3d}dialog{border:1px solid var(--line);border-radius:19px;background:var(--surface);color:var(--ink);box-shadow:0 25px 90px #102d3c33;padding:29px;width:520px;max-width:calc(100vw - 32px);max-height:90vh;overflow:auto}dialog::backdrop{background:#12312966;backdrop-filter:blur(3px)}dialog h2{font-size:23px}dialog .row{justify-content:flex-end;margin-top:24px}dialog label{margin-top:14px}.loading{padding:70px;text-align:center;color:var(--muted)}.spinner{width:24px;height:24px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;display:inline-block;margin-bottom:12px}@keyframes spin{to{transform:rotate(360deg)}}
:root[data-theme=dark],body[data-theme=dark]{--bg:#13231f;--surface:#1c2e28;--surface2:#243b32;--ink:#e2ede6;--muted:#9eb4a7;--line:#354d40;--accent:#70c6ab;--accent2:#234538;--shadow:0 12px 38px #0001;color-scheme:dark}body[data-theme=dark] .hero{background:linear-gradient(110deg,#284739,#25382d);border-color:#47624c}body[data-theme=dark] .hero h1,body[data-theme=dark] .hero p,body[data-theme=dark] .hero .eyebrow{color:#c5d7c8}body[data-theme=dark] .btn.primary,body[data-theme=dark] .admin-tabs .active{color:#123427}body[data-theme=dark] .notice.warning,body[data-theme=dark] .tag.amber{background:#443a24;color:#e4c78d;border-color:#695635}body[data-theme=dark] .notice.error,body[data-theme=dark] .quality-errors,body[data-theme=dark] .option.wrong,body[data-theme=dark] .feedback-card.wrong{background:#432d2c;color:#efbab4;border-color:#855551}body[data-theme=dark] .option.selected .letter{color:#132b24}
@media(min-width:1750px){.content{padding-top:38px}.hero{padding:39px}.home-bottom{gap:26px}}
@media(max-width:1200px){.shell{grid-template-columns:200px 1fr}.sidebar{padding:24px 12px}.content{padding:25px}.topbar{padding:0 25px}.hero{grid-template-columns:1fr 175px;padding:25px}.hero h1{font-size:26px}.orbit{width:163px;height:163px}.orbit-inner{width:127px;height:127px}.year-grid{grid-template-columns:repeat(4,1fr)}.editor-workspace{grid-template-columns:175px minmax(0,1fr)}.editor-original{grid-column:1/-1;position:static}.editor-original .original-text{max-height:300px}.stat{padding:17px}.stat-number{font-size:27px}}
@media(max-width:960px){.shell{grid-template-columns:175px 1fr}.sidebar .brand{padding:0}.brand b{font-size:18px}.brand img{width:36px;height:36px}.nav button{padding:11px;font-size:13px;gap:8px}.content{padding:22px 18px}.topbar{padding:0 18px}.grid4{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr}.hero-art{display:none}.home-bottom{grid-template-columns:1fr}.study-room{grid-template-columns:1fr}.reading-panel{position:static;max-height:450px}.pipeline{grid-template-columns:repeat(2,1fr)}.mode-cards{grid-template-columns:1fr}.mode-card p{min-height:0}.editor-head{grid-template-columns:1fr 1fr}.paper-cards{grid-template-columns:1fr}.auth-story{padding:40px}.auth-story h1{font-size:35px}.connection{display:none}}
@media(max-width:720px){.auth{grid-template-columns:1fr}.auth-story{display:none}.auth-form-wrap{padding:28px 24px}.shell{display:block}.sidebar{height:auto;position:static;padding:14px 17px;border-right:0;border-bottom:1px solid var(--line)}.sidebar .brand{margin:0 0 12px}.nav{display:flex;overflow:auto;gap:6px}.nav button{flex:none;width:auto;padding:8px 12px;white-space:nowrap;font-size:12px}.nav-label,.sidebar-tip,.sidebar-bottom .nav-label{display:none}.sidebar-bottom{margin:8px 0 0}.sidebar-bottom .nav{justify-content:flex-end}.sidebar-bottom .nav button{font-size:11px;padding:5px 9px}.topbar{height:65px;padding:0 17px}.top-right{gap:12px}.avatar{width:30px;height:30px}.breadcrumbs{font-size:11px}.content{padding:22px 17px 35px}.page-head{align-items:flex-start}.page-head h1{font-size:23px}.hero{padding:23px}.hero h1{font-size:26px}.grid2,.grid3,.field-grid{grid-template-columns:1fr}.grid4{gap:11px}.stat{padding:17px}.grid2>*{min-width:0}.field-grid .full{grid-column:auto}.year-grid{grid-template-columns:repeat(3,1fr)}.year-card{padding:9px}.editor-workspace{grid-template-columns:1fr}.editor-nav{position:static;max-height:190px}.editor-head{grid-template-columns:1fr 1fr}.editor-head label:first-child{grid-column:1/-1}.study-banner{align-items:flex-start;flex-wrap:wrap}.study-banner h1{font-size:20px}.study-footer{flex-wrap:wrap;position:static}.answer-map{max-width:100%}.result-summary strong{font-size:23px}.result-summary>div{padding:15px 8px}.auth-form h2{font-size:26px}.top-right .user-name{display:none}.panel{padding:19px}.source-controls label{width:calc(50% - 8px)}.source-controls label.wide{width:100%}.page-head .row{justify-content:flex-end}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,.btn,.study-footer,#toast{display:none!important}.shell{display:block}.content{padding:0}.panel{break-inside:avoid;box-shadow:none}.reading-panel{position:static;max-height:none}body{background:#fff;color:#000}}

.trial-notice{margin:12px 28px 0}.paper-card button{margin:6px 8px 0 0}
/* Learning clarity, progressive feedback and accessible interaction. */
:root{--muted:#566e63}.btn,.nav button,.group-tab,.answer-dot{transition:background-color .15s,border-color .15s,color .15s}.btn:hover{transform:none}.btn.small{min-height:38px}.btn.link{min-height:36px}summary{cursor:pointer}summary:focus-visible{outline:3px solid #e1ab57;outline-offset:4px;border-radius:6px}[hidden]{display:none!important}.page-head{align-items:flex-start}.page-head>div{min-width:0}.page-head p{max-width:75ch}.connection-settings{font-size:13px;color:var(--muted)}.connection-settings label{margin-top:14px}.auth-status:not(:empty){padding:10px;border-radius:8px;background:var(--surface2);color:var(--ink)}.source-details{margin-top:16px;font-size:12px;color:var(--muted)}.source-details p{margin:10px 0 0;overflow-wrap:anywhere}.library-filters{padding:15px 0;border-top:1px solid var(--line)}.library-list{display:grid;grid-template-columns:1fr 1fr;gap:12px}.library-item{border:1px solid var(--line);border-radius:12px;padding:17px;display:flex;align-items:center;justify-content:space-between;gap:16px;min-width:0}.library-item>div{min-width:0}.library-item h4{margin:12px 0 6px;overflow-wrap:anywhere}.library-item p{font-size:12px;color:var(--muted);margin:0}.library-item>.btn{flex:none}.phase-steps{display:grid;grid-template-columns:repeat(4,1fr);list-style:none;margin:0 0 13px;padding:0;border:1px solid var(--line);border-radius:13px;overflow:hidden;background:var(--surface)}.phase-steps li{display:grid;grid-template-columns:30px 1fr;gap:0 10px;padding:13px 16px;color:var(--muted);border-right:1px solid var(--line);font-size:13px}.phase-steps li:last-child{border-right:0}.phase-steps li>span{grid-row:1/3;width:29px;height:29px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;align-self:center}.phase-steps li small{font-size:11px}.phase-steps .current{background:var(--accent2);color:var(--accent);box-shadow:inset 0 -3px var(--accent)}.phase-steps .current>span{background:var(--accent);color:var(--surface);border-color:var(--accent)}.phase-steps .complete>span{color:var(--accent);border-color:var(--accent)}.session-guidance{font-size:12px;color:var(--muted);margin-bottom:22px}.study-progress{margin:15px 0 12px}.study-progress b{font-size:13px}.group-tab{display:flex;gap:10px;align-items:center;min-height:44px}.group-tab span{font-size:11px}.group-tab.active{box-shadow:inset 0 -2px var(--accent)}.question{scroll-margin-top:24px}.question.current-question{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.question-number{display:flex;justify-content:space-between;font-size:12px}.question-state{font-size:11px;font-weight:500;letter-spacing:0}.recommendation{margin-top:20px;padding:14px 0 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.recommendation summary{font-weight:600;color:var(--ink)}.recommendation p{margin-top:12px}.study-footer{align-items:flex-end;gap:22px;padding:15px 18px}.answer-nav{flex:1;min-width:0}.answer-map{max-width:none;margin-top:10px;gap:8px}.answer-cluster{display:flex;gap:4px;padding-right:8px;border-right:1px solid var(--line);flex-wrap:wrap}.answer-cluster:last-child{border:0;padding:0}.answer-dot{width:32px;height:34px;font-size:11px;position:relative}.answer-dot.current{border:2px solid var(--accent);font-weight:700;color:var(--accent)}.answer-dot.done::after{content:'';position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:8px;height:2px;background:var(--accent);border-radius:2px}.study-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:flex-end;max-width:38%}.study-tools button{min-width:38px;min-height:38px}.study-tools{flex-wrap:wrap}.result-actions{margin:10px 0 20px}.result-groups{display:grid;gap:13px}.result-group{padding:0;overflow:hidden}.result-group>summary{padding:20px 23px;display:flex;align-items:center;justify-content:space-between;gap:16px;list-style:none}.result-group>summary::-webkit-details-marker{display:none}.result-group>summary:after{content:'+';font-size:24px;color:var(--accent);margin-left:auto;flex:none}.result-group[open]>summary:after{content:'−'}.result-group>summary h3{font-size:17px;margin:10px 0 3px}.expand-label{color:var(--accent);white-space:nowrap}.result-group[open]>.group-review-body{border-top:1px solid var(--line)}.group-review-body{padding:22px 23px}.result-question{border:1px solid var(--line);border-radius:11px;margin-top:12px;overflow:hidden}.result-question>summary{padding:14px 16px;background:var(--surface2);display:flex;gap:18px;align-items:center;font-size:12px}.result-question>summary b{color:var(--ink);font-size:13px;min-width:54px}.result-question>summary .tag{margin-left:auto;white-space:nowrap}.result-question.needs-review{border-left:3px solid var(--danger)}.question-review-body{padding:20px}.question-review-body .question-prompt{font-size:17px}.reference-block{margin:14px 0;border:1px solid var(--line);border-radius:10px;overflow:hidden}.reference-block>summary{padding:12px 15px;font-size:13px;font-weight:600;color:var(--accent);background:var(--surface2)}.reference-text{padding:18px 20px;font-size:16px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere;max-height:560px;overflow:auto;scrollbar-gutter:stable;max-width:100%;color:var(--ink)}.reference-text.passage{font-size:17px}.reference-text.translation-text{font-family:"Microsoft YaHei",system-ui,sans-serif;font-size:16px;line-height:2;letter-spacing:.15px}.reference-text.feedback-card{background:var(--surface);border:0;border-radius:0}.reference-block .audio-box{margin:15px}.review-options{display:grid;gap:8px;margin:16px 0}.review-options>div{display:flex;gap:12px;border:1px solid var(--line);border-radius:9px;padding:12px;font-size:14px}.review-options b{flex:none}.review-options span{flex:1}.review-options small{font-size:11px;flex:none}.review-options .correct{background:var(--accent2);border-color:var(--accent);color:var(--accent)}.review-options .incorrect{border-color:var(--danger)}.feedback-section{margin:20px 0}.feedback-section h4{margin-bottom:10px}.teacher-feedback .feedback-card{font-size:15px;line-height:1.8}.feedback-bottom{margin-top:18px}.grade-response{overflow-wrap:anywhere;max-height:480px;overflow:auto}.original-actions{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.original-label{margin:15px 0 8px;font-weight:600}.original-text{font-size:14px}.editor-original{padding:18px}.document-dialog{width:1100px;max-height:94vh}.document-preview{width:100%;height:70vh;border:1px solid var(--line);border-radius:8px;background:white}.document-text{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:1.9;max-height:64vh;overflow:auto;padding:20px;background:var(--surface2);border-radius:10px}.document-dialog>.row{margin-top:12px}.preview-player{width:100%}body[data-theme=dark] .tag.red{background:#432d2c;color:#efbab4}body[data-theme=dark] .phase-steps .current>span{color:#13231f}.empty+.btn{margin-top:15px}.trial-notice{display:none}
@media(min-width:1201px){.editor-workspace{grid-template-columns:185px minmax(0,1fr) minmax(290px,.85fr)}}
@media(max-width:1100px){.library-list{grid-template-columns:1fr}.study-footer{flex-wrap:wrap}.study-actions{max-width:none}.answer-nav{flex-basis:100%}.phase-steps li{padding:12px 10px}}
@media(max-width:720px){.page-head{flex-wrap:wrap}.topbar .breadcrumbs{max-width:44%}.phase-steps li{grid-template-columns:1fr;text-align:center;gap:5px;padding:12px 4px}.phase-steps li>span{display:none}.phase-steps li small{font-size:10px}.study-tools{gap:8px}.study-progress{align-items:flex-start}.study-progress>span:last-child{display:none}.study-footer{position:sticky;bottom:0;padding:12px;gap:12px}.answer-map{max-height:105px;overflow:auto}.answer-dot{width:34px;height:36px}.study-actions{width:100%;justify-content:flex-end}.study-actions .btn{min-height:40px}.study-actions .btn.primary{flex:1}.study-room .reading-panel{max-height:440px}.group-review-body,.question-review-body{padding:15px}.result-group>summary{padding:17px}.result-question>summary{gap:8px;flex-wrap:wrap;padding:12px}.result-question>summary b{min-width:45px}.result-question>summary span:not(.tag){font-size:11px}.expand-label{display:none}.reference-text{padding:14px;font-size:15px}.review-options>div{flex-wrap:wrap}.review-options span{flex-basis:75%}.review-options small{margin-left:23px}.library-item{padding:15px;gap:10px}.library-item .row{gap:6px}.library-item>.btn{padding:9px 11px}.question{padding:17px}.content{padding-bottom:25px}.source-controls label{width:100%}.library-filters{gap:12px}.document-dialog{padding:18px}.editor-head{grid-template-columns:1fr}.editor-head label:first-child{grid-column:auto}}

body{background:var(--bg);color:var(--ink)}.result-group>summary>div{flex:1}.result-group>summary:after{margin-left:10px}

.pdf-controls{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}.pdf-controls label{display:flex;align-items:center;gap:8px;margin:0}.pdf-controls input{width:70px;padding:7px;margin:0}.document-preview{height:64vh;overflow:auto;background:#e5e8e7;padding:15px;display:block;text-align:center}.document-preview canvas{display:block;margin:0 auto;max-width:100%;box-shadow:0 3px 12px #0002;background:white}.document-preview canvas:not([data-rendered]){display:none}.document-preview #pdf-status{padding:15px;color:#395248}

.coverage-dialog{width:850px}.coverage-summary{display:flex;gap:12px;margin:20px 0}.coverage-summary>div{flex:1;background:var(--surface2);border-radius:12px;padding:16px}.coverage-summary strong{display:block;font-size:26px;color:var(--ink)}.coverage-summary span{font-size:12px;color:var(--muted)}.coverage-dialog .table-wrap{max-height:49vh}.coverage-dialog th{position:sticky;top:0;z-index:1}

.compact-options{grid-template-columns:repeat(2,minmax(0,1fr))}.compact-options .option{padding:8px 10px;gap:8px;align-items:center;overflow-wrap:anywhere}