:root{
  --cream:#FFFDF5;--cream-dark:#FFF8E7;--purple:#7C3AED;--purple-light:#A78BFA;--purple-dark:#5B21B6;
  --yellow:#FBBF24;--yellow-light:#FDE68A;--pink:#F472B6;--pink-light:#FBCFE8;--mint:#34D399;
  --mint-light:#A7F3D0;--sky:#60A5FA;--sky-light:#BFDBFE;--ink:#1F2937;--ink-light:#4B5563;
  --ink-muted:#9CA3AF;--card:#fff;--line:#1F2937;--radius:20px;--shadow:4px 4px 0 var(--line);
  --shadow-sm:2px 2px 0 var(--line);--shadow-hover:6px 6px 0 var(--line);
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --serif:"Noto Serif SC","Source Han Serif SC",serif;--mono:"Cascadia Mono","Consolas",monospace;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;font-family:var(--sans);color:var(--ink);line-height:1.6;background-color:var(--cream);background-image:radial-gradient(circle,var(--line) 1px,transparent 1px);background-size:24px 24px;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}.shell{width:min(1100px,calc(100% - 36px));margin:auto}.hidden{display:none!important}.muted{color:var(--ink-muted)}.small{font-size:.8rem}.sub{color:var(--ink-light);font-size:.9rem;line-height:1.7}.eyebrow{font-size:.72rem;letter-spacing:.2em;color:var(--purple);font-weight:800;margin-bottom:7px}.brand{color:var(--ink);text-decoration:none}.brand-text{font-family:var(--serif);font-size:1.25rem;font-weight:800;letter-spacing:.05em;white-space:nowrap}.topbar{position:sticky;top:0;z-index:40;background:#fff;border-bottom:3px solid var(--line);box-shadow:var(--shadow-sm)}.topbar-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}.top-actions{display:flex;align-items:center;gap:10px}
h1,h2,h3{font-family:var(--serif);line-height:1.25;font-weight:800}.admin-main{padding:36px 0 80px}.admin-head{display:flex;justify-content:space-between;align-items:end;gap:22px;margin:6px 0 24px}.admin-head h1{font-size:clamp(2rem,5vw,3.2rem);margin:0 0 8px;position:relative;display:inline-block}.admin-head h1:after{content:"";position:absolute;left:-3px;right:-8px;bottom:3px;height:12px;background:var(--yellow);border-radius:4px;z-index:-1;opacity:.72}.admin-head p{margin:0}
.card{background:var(--card);border:2px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:24px 28px;position:relative}.card:before{content:"";position:absolute;top:-3px;left:20px;right:20px;height:6px;background:var(--yellow);border-radius:0 0 6px 6px;opacity:.65}.card h2{margin:0 0 6px;font-size:1.55rem}.card h3{margin:0 0 10px}.card+.card{margin-top:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:3px solid var(--line);border-radius:999px;padding:.65em 1.35em;font-size:.94rem;font-weight:750;text-decoration:none;background:#fff;color:var(--ink);box-shadow:var(--shadow-sm);transition:transform .1s,box-shadow .1s,background .15s}.btn:hover{box-shadow:var(--shadow-hover)}.btn:active{transform:translateY(2px);box-shadow:var(--shadow-sm)}.btn-primary{background:var(--purple);color:#fff}.btn-primary:hover{background:var(--purple-dark)}.btn-soft{background:var(--yellow)}.btn-soft:hover{background:var(--yellow-light)}.btn-ghost{background:#fff;color:var(--purple)}.btn-ghost:hover{background:var(--purple-light);color:#fff}.btn-danger{background:var(--pink-light);color:#9d174d}.btn-block{width:100%;padding:.78em 1.4em}.btn-sm{padding:.45em 1em;font-size:.84rem}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:focus-visible,a:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}
.form{display:grid;gap:16px;margin-top:22px}.field{display:grid;gap:6px}.field label{font-size:.88rem;font-weight:700;color:var(--ink-light)}.field input,.field select,.field textarea{width:100%;background:#fff;border:2.5px solid var(--line);border-radius:12px;padding:.65em .78em;outline:none;transition:border-color .15s,box-shadow .15s}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--purple);box-shadow:3px 3px 0 var(--purple-light)}.field textarea{resize:vertical;min-height:96px}.two,.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.message{display:none;border:2px solid var(--line);border-radius:12px;padding:10px 13px;font-size:.87rem;box-shadow:var(--shadow-sm)}.message.show{display:block}.message.error{background:var(--pink-light);color:#831843}.message.ok{background:var(--mint-light);color:#065f46}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}.metric{position:relative;overflow:hidden;background:#fff;border:3px solid var(--line);border-radius:16px;padding:17px 18px;box-shadow:var(--shadow-sm)}.metric:before{content:"";position:absolute;left:0;top:0;bottom:0;width:7px;background:var(--purple)}.metric:nth-child(2):before{background:var(--yellow)}.metric:nth-child(3):before{background:var(--pink)}.metric:nth-child(4):before{background:var(--mint)}.metric span{font-size:.78rem;color:var(--ink-light);font-weight:700}.metric b{display:block;font-family:var(--serif);font-size:1.9rem;line-height:1.2;margin-top:5px}.dashboard{display:grid;grid-template-columns:330px 1fr;gap:18px;align-items:start}.dashboard .card{padding:23px}.code-reveal{background:var(--purple);color:#fff;border:3px solid var(--line);border-radius:16px;padding:18px;margin-top:18px;box-shadow:var(--shadow)}.code-reveal .code{font:800 1.6rem var(--mono);letter-spacing:.16em;color:var(--yellow-light);margin:8px 0}.code-reveal .btn{color:var(--ink)}
.table-wrap{overflow:auto;margin-top:6px}.table{width:100%;border-collapse:collapse;min-width:720px}.table th{text-align:left;color:var(--ink-light);font-size:.74rem;letter-spacing:.04em;padding:11px;border-bottom:3px solid var(--line);background:var(--cream-dark)}.table th:first-child{border-radius:10px 0 0 0}.table th:last-child{border-radius:0 10px 0 0}.table td{padding:14px 11px;border-bottom:2px solid var(--line);font-size:.86rem;vertical-align:middle}.table tr:hover td{background:var(--yellow-light)}.name{font-family:var(--serif);font-weight:800}.mono{font-family:var(--mono)}.pill{display:inline-flex;border:2px solid var(--line);border-radius:999px;padding:4px 9px;font-size:.72rem;font-weight:800;box-shadow:1px 1px 0 var(--line)}.pill.unused{background:var(--yellow-light)}.pill.in_progress{background:var(--pink-light)}.pill.submitted{background:var(--mint-light)}.pill.expired,.pill.cancelled{background:#e5e7eb;color:var(--ink-light)}.empty{padding:48px 20px;text-align:center;color:var(--ink-light);border:2px dashed var(--line);border-radius:14px;background:var(--cream-dark)}
.detail{display:none}.detail.show{display:block}.answer-box{background:var(--cream-dark);border:2px solid var(--line);border-radius:14px;padding:16px;max-height:300px;overflow:auto}.answer-list{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;font-size:.79rem}.answer-list span{background:#fff;border:2px solid var(--line);padding:6px;border-radius:8px}.score{font-family:var(--serif);font-size:2rem;font-weight:800;color:var(--purple)}
.paper-library{margin-top:24px;scroll-margin-top:88px}.library-head{display:flex;align-items:start;justify-content:space-between;gap:20px}.library-head h2{margin:0 0 5px}.paper-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px}.paper-tile{position:relative;overflow:hidden;border:3px solid var(--line);border-radius:16px;padding:18px;background:#fff;box-shadow:var(--shadow-sm)}.paper-tile:before{content:"";position:absolute;left:0;top:0;bottom:0;width:7px;background:var(--course-color,var(--purple))}.paper-tile[role="button"]{cursor:pointer;transition:transform .16s ease,box-shadow .16s ease,background .16s ease}.paper-tile[role="button"]:hover,.paper-tile[role="button"]:focus-visible{transform:translateY(-3px);box-shadow:7px 9px 0 var(--ink);background:#fffdf6;outline:none}.paper-tile.basic{--course-color:var(--mint)}.paper-tile.advanced{--course-color:var(--purple)}.paper-tile.pet{--course-color:var(--yellow)}.paper-course{font-size:.72rem;font-weight:800;letter-spacing:.1em;color:var(--ink-light)}.paper-name{font-family:var(--serif);font-weight:800;margin:8px 0 3px}.paper-version{font-family:var(--mono);color:var(--purple);font-size:.82rem}.paper-foot{display:flex;justify-content:space-between;align-items:center;margin-top:14px}.paper-preview-hint{margin-top:16px;font-weight:900;color:var(--purple);font-size:.86rem}.paper-form{border-top:3px dashed var(--line);margin-top:24px;padding-top:22px}.draft-note{background:var(--yellow-light);border:2px dashed var(--line);border-radius:13px;padding:12px 14px;font-size:.84rem;line-height:1.65}
.login-wrap{width:min(470px,calc(100% - 32px));margin:8vh auto}.login-wrap>.brand{display:block;width:max-content;margin:0 auto 26px;font-size:1.5rem}.login-wrap .card{border-width:3px;box-shadow:var(--shadow)}
.speaking-recordings{margin-top:18px;max-height:none}.speaking-part{display:grid;grid-template-columns:90px minmax(0,1fr);gap:14px;align-items:center;padding:10px 0;border-top:1px solid #d8d1e7}.speaking-part:first-child{border-top:0}.speaking-part audio{width:100%;height:38px}.speaking-timestamps{grid-column:2;font-size:.76rem;color:var(--ink-light);line-height:1.6}
@media(max-width:850px){.metrics{grid-template-columns:1fr 1fr}.dashboard{grid-template-columns:1fr}.detail-grid,.two{grid-template-columns:1fr}.admin-head,.library-head{align-items:start;flex-direction:column}.paper-grid{grid-template-columns:1fr}.top-actions #teacher-name{display:none}}
@media(max-width:540px){.shell{width:min(100% - 22px,1100px)}.topbar-inner{min-height:60px}.top-actions{gap:6px}.top-actions .btn{padding:.42em .75em}.admin-main{padding-top:26px}.metrics{gap:8px}.metric{padding:13px}.card,.dashboard .card{padding:20px}.answer-list{grid-template-columns:repeat(2,1fr)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* Teacher workbench: denser information hierarchy without changing the brand language. */
.shell{width:min(1500px,calc(100% - 36px))}
.admin-main{padding-top:28px}.admin-head{align-items:center;margin-bottom:16px}.admin-head h1{font-size:clamp(2rem,4vw,2.85rem)}
.sync-actions{display:flex;align-items:center;justify-content:flex-end;gap:12px;flex-wrap:wrap}.sync-note{margin:0;color:var(--ink-light);font-size:.78rem;font-weight:700}.sync-note.sync-error{color:#9d174d}
.status-overview{display:flex;align-items:center;gap:8px;overflow-x:auto;padding:4px 3px 10px;margin-bottom:10px;scrollbar-width:thin}
.status-chip{appearance:none;display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;border:2px solid var(--line);border-radius:999px;background:#fff;padding:7px 12px;font-size:.78rem;font-weight:800;box-shadow:1px 1px 0 var(--line);white-space:nowrap;transition:transform .12s,background .12s,box-shadow .12s}
.status-chip b{font:900 .86rem var(--mono)}.status-chip:hover{transform:translateY(-1px);box-shadow:3px 3px 0 var(--line)}.status-chip.active{background:var(--sky-light)}
.status-chip.unused{background:#fff7d6}.status-chip.in_progress{background:#fce7f3}.status-chip.submitted{background:#e4e0ff}.status-chip.pending_review{background:var(--yellow);border-width:3px;box-shadow:3px 3px 0 var(--line)}.status-chip.completed{background:#dcfce7}.status-chip.expired{background:#f3f4f6;color:#64748b}
.status-chip.pending_review.active{background:#f59e0b}.status-chip:focus-visible{outline:3px solid var(--purple-light);outline-offset:2px}
.dashboard{grid-template-columns:300px minmax(0,1fr);gap:16px}.dashboard .card{padding:20px}.create-card{position:sticky;top:88px}.create-card .form{gap:13px;margin-top:18px}.field-help{margin:0 0 2px;color:var(--ink-muted);font-size:.72rem;line-height:1.55}.create-card .field textarea{min-height:74px}
.list-card-head{display:flex}#list-card{min-width:0;padding:18px}
.library-head h2,#list-card h2{margin-top:0}.list-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}
.review-toggle{appearance:none;border:3px solid var(--line);border-radius:999px;background:var(--yellow);padding:7px 13px;font-size:.8rem;font-weight:900;box-shadow:2px 2px 0 var(--line);white-space:nowrap}.review-toggle[aria-pressed="true"]{background:#f59e0b;box-shadow:inset 0 0 0 2px #fff,3px 3px 0 var(--line)}
.list-toolbar{display:grid;grid-template-columns:minmax(180px,1.25fr) minmax(160px,1fr) minmax(145px,.8fr);gap:10px;margin:14px 0 10px;padding:11px;background:var(--cream-dark);border:2px dashed var(--line);border-radius:14px}
.filter-field{display:grid;gap:4px}.filter-field label{font-size:.68rem;font-weight:800;color:var(--ink-light);letter-spacing:.04em}.filter-field input,.filter-field select{width:100%;min-width:0;border:2px solid var(--line);border-radius:9px;background:#fff;padding:7px 9px;font-size:.8rem;outline:none}.filter-field input:focus,.filter-field select:focus{border-color:var(--purple);box-shadow:2px 2px 0 var(--purple-light)}
#list-card .table-wrap{margin-top:4px}#list-card .table{min-width:920px;table-layout:auto}#list-card .table th{padding:9px 8px;font-size:.69rem;white-space:nowrap}#list-card .table td{padding:10px 8px;font-size:.79rem;line-height:1.4}#list-card .table tr:hover td{background:#fffaf0}
#list-card .table th:nth-child(1){width:13%}#list-card .table th:nth-child(2){width:16%}#list-card .table th:nth-child(3){width:11%}#list-card .table th:nth-child(4){width:10%}#list-card .table th:nth-child(5){width:23%}#list-card .table th:nth-child(6){width:17%}#list-card .table th:nth-child(7){width:10%}
.paper-cell,.activity-time{font-weight:700}.activity-time{white-space:nowrap}.progress-grid{display:grid;grid-template-columns:repeat(2,minmax(72px,1fr));gap:4px 8px;white-space:nowrap}.progress-grid span{display:flex;align-items:center;gap:5px;color:var(--ink-light)}.progress-grid b{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;border:1.5px solid var(--line);border-radius:6px;background:var(--cream-dark);color:var(--ink);font-size:.68rem}
.action-cell{text-align:right}.btn-table{min-width:76px;padding:.42em .8em;border-width:2px;font-size:.75rem;box-shadow:1px 1px 0 var(--line);white-space:nowrap;line-height:1.3}.btn-table:hover{box-shadow:3px 3px 0 var(--line)}.btn-review{background:var(--yellow);color:var(--ink)}.btn-quiet{background:#f3f4f6;color:var(--ink-light)}
.pill{white-space:nowrap}.pill.unused{background:#fff7d6;color:#785b00}.pill.in_progress{background:#fce7f3;color:#9d174d}.pill.submitted{background:#e4e0ff;color:#5b21b6}.pill.pending_review{background:var(--yellow);color:#5b3900;border-width:2.5px}.pill.completed{background:#dcfce7;color:#166534}.pill.expired{background:#e5e7eb;color:#64748b}.pill.cancelled{background:#f4e4e8;color:#8b5b67}
.empty{padding:34px 20px}.empty strong,.empty span{display:block}.empty span{font-size:.8rem;margin:4px 0 14px}.detail{scroll-margin-top:84px}
@media(max-width:1180px){.shell{width:min(1120px,calc(100% - 28px))}.dashboard{grid-template-columns:270px minmax(0,1fr)}.dashboard .card{padding:17px}.progress-grid{grid-template-columns:1fr}#list-card .table{min-width:880px}}
@media(max-width:980px){.dashboard{grid-template-columns:1fr}.create-card{position:relative;top:auto}.list-toolbar{grid-template-columns:1fr 1fr}.filter-field:first-child{grid-column:1/-1}.admin-head{align-items:flex-start}#list-card{padding:16px}}
@media(max-width:640px){.admin-head{flex-direction:column}.sync-actions{justify-content:flex-start}.list-toolbar{grid-template-columns:1fr}.filter-field:first-child{grid-column:auto}.list-heading{flex-direction:column}.status-overview{margin-right:-11px}#list-card{padding:14px}}

/* Record lifecycle controls keep the existing primary table action dominant. */
.row-actions{display:inline-flex;align-items:center;justify-content:flex-end;gap:8px;white-space:nowrap}
.record-more{width:34px;height:34px;flex:none;display:inline-flex;align-items:center;justify-content:center;border:1.5px solid #8993a4;border-radius:9px;background:#fff;color:#354255;padding:0;box-shadow:none}
.record-more-icon{display:inline-flex;align-items:center;justify-content:center;gap:3px}
.record-more-icon i{display:block;width:4px;height:4px;flex:none;border-radius:50%;background:currentColor}
.record-more:hover,.record-more[aria-expanded="true"]{border-color:var(--purple);color:var(--purple);background:#f5f0ff}
.record-more:focus-visible{outline:3px solid var(--purple-light);outline-offset:2px}
.record-actions-menu{position:fixed;z-index:110;width:152px;padding:6px;background:#fff;border:1.5px solid var(--line);border-radius:11px;box-shadow:2px 3px 0 rgba(31,41,55,.78)}
.record-actions-menu button{display:block;width:100%;border:0;border-radius:6px;background:transparent;padding:8px 9px;text-align:left;font-size:.78rem;font-weight:750}
.record-actions-menu button:hover,.record-actions-menu button:focus-visible{background:#f5f0ff;outline:none}
.record-actions-menu button.danger{color:#9d174d}.record-actions-menu button.danger:hover{background:var(--pink-light)}
.pill.archived{background:#eef0f3;color:#626c7a}
.record-action-dialog{width:min(440px,calc(100% - 28px));max-height:calc(100vh - 32px);overflow:auto;border:3px solid var(--line);border-radius:16px;padding:21px 23px;background:#fff;box-shadow:5px 5px 0 var(--line);color:var(--ink)}
.record-action-dialog::backdrop{background:rgba(20,28,45,.45)}.record-action-dialog h2{margin:0 0 12px;font-size:1.35rem}.record-action-dialog p{font-size:.85rem;line-height:1.65}
.record-identity{background:var(--cream-dark);border:1.5px solid #d4d6dc;border-radius:9px;padding:10px 12px}.dependency-list{list-style:none;margin:8px 0 12px;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:4px 16px;font-size:.77rem}
.dependency-list li{display:flex;justify-content:space-between;gap:8px;border-bottom:1px solid #e5e7eb;padding:3px 0}.dependency-list b{font-family:var(--mono)}
.record-warning{background:var(--pink-light);border-radius:9px;padding:9px 11px;color:#831843;font-weight:700}.delete-label{display:block;font-size:.78rem;font-weight:800;margin-bottom:5px}
#record-delete-word{width:100%;border:2px solid var(--line);border-radius:8px;padding:8px;font-family:var(--mono)}.record-error{min-height:1.1em;color:#9d174d;font-weight:700}
.record-dialog-actions{display:flex;justify-content:flex-end;gap:8px}.record-dialog-actions .btn{box-shadow:1px 1px 0 var(--line)}