:root{--ink:#352f2a;--muted:#766d64;--paper:#fffdf8;--bg:#f4ecdf;--green:#c96542;--green2:#f4dfc9;--red:#a8443d;--line:#e4d6c5;--gold:#d69a48}*{box-sizing:border-box}body{margin:0;font-family:"Microsoft YaHei",system-ui,sans-serif;background:radial-gradient(circle at 12% 0,#fff7e8 0,transparent 34%),linear-gradient(145deg,#f5ecdd,#eadbc8);color:var(--ink);min-height:100vh}button,input,select{font:inherit}.shell{width:min(1060px,calc(100% - 32px));margin:36px auto}.top{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.brand{font-size:24px;font-weight:800;letter-spacing:-.02em}.sub{color:var(--muted);font-size:14px}.card{background:rgba(255,253,248,.95);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:0 14px 40px rgba(89,62,39,.10);margin-bottom:18px}.login{max-width:430px;margin:12vh auto}.login h1{margin:0 0 8px}.field{display:grid;gap:7px;margin:18px 0}.field input,.field select{padding:12px 14px;border:1px solid #d2bfaa;border-radius:10px;background:#fffdfa;color:var(--ink)}.field input:focus,.field select:focus{outline:3px solid #efd7bd;border-color:#c96542}.btn{border:0;border-radius:10px;padding:11px 17px;background:var(--green);color:#fffaf4;cursor:pointer;font-weight:700;box-shadow:0 3px 9px rgba(151,71,41,.16)}.btn:hover{background:#b95737}.btn.secondary{background:#eadfce;color:var(--ink);box-shadow:none}.btn.secondary:hover{background:#dfd0bd}.btn.danger{background:var(--red)}.btn:disabled{opacity:.45;cursor:not-allowed}.hidden{display:none!important}.error{color:var(--red);min-height:22px}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.metric{padding:18px;background:#f8f0e5;border:1px solid #eadcca;border-radius:14px}.metric b{font-size:29px;display:block;margin-top:5px;color:#a64e32}.section-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:15px}.section-title h2{font-size:19px;margin:0}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:12px 9px;border-bottom:1px solid var(--line);font-size:14px}th{color:var(--muted)}.tag{display:inline-block;padding:4px 8px;border-radius:999px;background:var(--green2);color:#874329;font-size:12px}.task-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.word-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px 26px;margin:20px 0}.word-row{display:flex;gap:12px;padding:9px;border-bottom:1px dashed var(--line)}.word-row b{min-width:100px}.progress{height:8px;background:#eadfce;border-radius:999px;overflow:hidden;margin:14px 0 28px}.progress span{display:block;height:100%;background:linear-gradient(90deg,#d98556,var(--green));transition:.25s}.sentence{font-family:Georgia,"Times New Roman",serif;font-size:31px;line-height:1.5;margin:24px 0}.sentence strong{color:#b65335;border-bottom:3px solid #e2a477}.options{display:grid;grid-template-columns:1fr 1fr;gap:12px}.option{padding:15px;text-align:left;border:1px solid #dbcbb8;background:#fffdf8;color:var(--ink);border-radius:12px;cursor:pointer}.option:hover{border-color:var(--green);background:#fff4e6;box-shadow:0 3px 12px rgba(111,74,43,.08)}.feedback{margin-top:20px;padding:17px;border-radius:12px;background:#f5dfc8;border-left:4px solid var(--green)}.feedback.bad{background:#f8e2dc;border-left-color:var(--red)}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.tabs{display:flex;gap:8px;margin-bottom:18px}.tab{background:#e8dccb;color:var(--ink);box-shadow:none}.tab.active{background:#473a30;color:#fffaf4}.modal{position:fixed;inset:0;background:#3b2e2480;display:grid;place-items:center;padding:20px}.modal .card{width:min(520px,100%)}@media(max-width:760px){.grid{grid-template-columns:1fr 1fr}.options,.word-list{grid-template-columns:1fr}.shell{margin:18px auto}.sentence{font-size:25px}.task-head{display:block}table{display:block;overflow:auto}}
/* Spacious student layout and focused teacher home */
.shell{width:min(1000px,calc(100% - 48px));margin:48px auto}
.student-page .shell{width:min(820px,calc(100% - 48px));margin:54px auto}
.student-page .card{padding:36px 42px;margin-bottom:30px}
.student-page .top{margin-bottom:38px}
.student-page .sentence{font-size:36px;line-height:1.65;text-align:center;margin:42px 0 36px}
.student-page .options{gap:18px}
.student-page .option{min-height:68px;padding:21px;font-size:17px}
.student-page .feedback{margin-top:30px;padding:22px}
.welcome{display:flex;justify-content:space-between;align-items:flex-end;gap:28px;margin:8px 0 30px}
.welcome h1{font-size:30px;margin:12px 0}
.welcome p{color:var(--muted);margin:0;max-width:620px;line-height:1.8}
.student-list{display:grid;gap:16px}
.student-card{background:rgba(255,253,248,.96);border:1px solid var(--line);border-radius:17px;padding:23px 25px}
.student-main,.student-actions{display:flex;align-items:center;justify-content:space-between;gap:18px}
.student-card h3{margin:0 0 5px;font-size:20px}
.student-actions{margin-top:20px;padding-top:17px;border-top:1px dashed var(--line)}
.student-actions .sub{margin-right:auto}
.status{font-size:13px;padding:6px 11px;border-radius:999px;background:#eee4d7;color:#766d64}
.status.completed{background:var(--green2);color:#874329}.status.published,.status.started{background:#f8e2dc;color:var(--red)}
.quick-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden;margin-top:28px}
.quick-stats>div{background:#f8f0e5;padding:20px}.quick-stats span{display:block;color:var(--muted);font-size:13px}.quick-stats b{display:block;margin-top:10px;color:#a64e32;font-size:23px}.quick-stats small{font-size:12px;font-weight:400}.quick-stats .stat-text{font-size:13px;line-height:1.5}
.word-summary{margin:16px 4px}.word-table{overflow:auto}
.student-insights{display:grid;grid-template-columns:1.8fr 1.5fr 1fr;gap:14px;margin-top:20px;padding:16px 0;border-top:1px solid #eee1d2;border-bottom:1px solid #eee1d2}
.insight{min-width:0}.insight-label{display:block;color:var(--muted);font-size:12px;margin-bottom:8px}.insight p{margin:0;font-size:14px;line-height:1.7}.word-chips{display:flex;gap:6px;flex-wrap:wrap;min-height:28px}.word-chip{display:inline-flex;align-items:center;gap:5px;padding:5px 8px;border-radius:8px;background:#f8f0e5;font-size:13px}.word-chip small{color:var(--muted);font-size:11px}.text-btn{border:0;background:none;color:#a64e32;cursor:pointer;padding:0;margin-top:7px;font-size:13px;text-decoration:underline}.text-btn:hover{color:#7f3826}.detail-list{display:grid;gap:7px;margin:18px 0;max-height:55vh;overflow:auto}.detail-row,.calendar-row{display:flex;align-items:center;gap:10px;padding:9px 10px;border-bottom:1px dashed var(--line);font-size:14px}.detail-row b{min-width:110px}.calendar-row{justify-content:space-between}.calendar-row b{color:#a64e32}
@media(max-width:760px){.shell,.student-page .shell{width:calc(100% - 28px);margin:24px auto}.student-page .card{padding:25px 20px}.student-page .sentence{font-size:28px;margin:32px 0 28px}.student-page .option{padding:17px;min-height:60px}.welcome,.student-main,.student-actions{display:block}.student-actions .btn{margin-top:12px;margin-right:7px}.quick-stats{grid-template-columns:1fr 1fr}.quick-stats>div{padding:15px}}
@media(max-width:760px){.student-insights{grid-template-columns:1fr;gap:13px}.student-actions .sub{display:block;margin-bottom:3px}.word-chip{font-size:12px}}