:root{--bg:#f3f4ef;--surface:#fff;--surface-2:#f8f8f4;--ink:#20231f;--muted:#747970;--line:#e2e5dd;--nav:#20251f;--nav-2:#384036;--nav-text:#eaf0e6;--primary:#6d56cf;--primary-soft:#eeeaff;--green:#4a8c70;--green-soft:#e3f2e9;--orange:#da6b4d;--orange-soft:#ffebe3;--blue:#5681bd;--shadow:0 8px 28px rgba(32,35,31,.06)}
[data-theme="dark"]{--bg:#181b18;--surface:#222622;--surface-2:#292e29;--ink:#edf1eb;--muted:#a4aba1;--line:#3b423a;--nav:#111411;--nav-2:#30382f;--nav-text:#edf3e9;--primary:#a58df1;--primary-soft:#30294b;--green:#73b996;--green-soft:#213c2f;--orange:#f08c6c;--orange-soft:#432c25;--blue:#7da6df;--shadow:0 10px 35px rgba(0,0,0,.18)}
*{box-sizing:border-box}html{color-scheme:light}html[data-theme="dark"]{color-scheme:dark}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,"Microsoft YaHei",Arial,sans-serif}.app-shell{display:flex;min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:228px;padding:28px 17px;background:var(--nav);color:var(--nav-text);display:flex;flex-direction:column;z-index:10}.brand{display:flex;gap:11px;align-items:center;padding:0 10px 29px;font-size:17px}.brand span{display:grid;place-items:center;width:34px;height:34px;background:#dcefcf;color:#263326;border-radius:10px;font-size:24px}.sidebar nav{display:grid;gap:5px}.nav-button{width:100%;display:flex;align-items:center;gap:12px;padding:11px 13px;border:0;border-radius:10px;background:transparent;color:#adb6a9;font-size:14px;text-align:left;cursor:pointer}.nav-button:hover,.nav-button.active{background:var(--nav-2);color:#fff}.nav-button i{font-style:normal;width:18px;text-align:center;font-size:17px}.nav-button em{margin-left:auto;padding:2px 7px;border-radius:9px;background:#df7659;color:#fff;font-style:normal;font-size:9px}.storage-card{margin-top:auto;padding:16px 12px;border-top:1px solid #3b423a;display:grid;gap:5px}.storage-card small,.storage-card span{color:#8d978a;font-size:10px}.storage-card strong{font-size:12px}.main{margin-left:228px;width:calc(100% - 228px);padding:32px clamp(24px,4vw,62px) 60px;max-width:1680px}.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.topbar small,.eyebrow{color:var(--muted);font-size:10px;letter-spacing:.1em;text-transform:uppercase}.topbar h1{font:500 30px Georgia,"Songti SC",serif;margin:4px 0}.top-actions{display:flex;align-items:center;gap:10px}.global-search{width:min(300px,32vw);height:40px;padding:0 12px;border:1px solid var(--line);border-radius:11px;background:var(--surface);display:flex;align-items:center;gap:8px}.global-search input{width:100%;border:0;outline:0;background:transparent;color:var(--ink);font-size:12px}.icon-button{width:38px;height:38px;border:1px solid var(--line);border-radius:50%;background:var(--surface);color:var(--ink);cursor:pointer;font-size:18px}.avatar{width:40px;height:40px;border-radius:50%;background:#dbe9cf;color:#263326;display:grid;place-items:center;font-weight:700}.notice{display:flex;align-items:center;gap:12px;padding:13px 16px;margin-bottom:18px;border:1px solid #dad1ff;border-radius:13px;background:var(--primary-soft);font-size:12px}.notice b{padding:4px 8px;border-radius:6px;background:var(--primary);color:#fff;font-size:9px}.notice span{flex:1}.dashboard-grid{display:grid;grid-template-columns:1.35fr .85fr;gap:16px}.panel{padding:20px;border:1px solid var(--line);border-radius:16px;background:var(--surface);box-shadow:var(--shadow)}.panel-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:17px}.panel-header h2{margin:3px 0 0;font:500 19px Georgia,"Songti SC",serif}.panel-header a,.link-button{border:0;background:transparent;color:var(--primary);font-size:11px;cursor:pointer;text-decoration:none}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px}.stat{padding:15px;border:1px solid var(--line);border-radius:13px;background:var(--surface)}.stat span{display:block;color:var(--muted);font-size:10px}.stat strong{display:block;margin:7px 0 4px;font-size:25px}.stat small{font-size:9px;color:var(--green)}.stat small.warn{color:var(--orange)}.chart-panel{min-height:285px}.chart-wrap{height:210px;display:flex;align-items:stretch;gap:18px}.bars{flex:1;display:flex;align-items:flex-end;gap:12px;padding:20px 8px 20px;border-left:1px solid var(--line);border-bottom:1px solid var(--line)}.bar-item{flex:1;height:100%;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:7px}.bar{width:min(34px,80%);min-height:4px;border-radius:5px 5px 2px 2px;background:var(--green);transition:height .25s ease}.bar-item:nth-child(2n) .bar{background:var(--primary)}.bar-item small{font-size:9px;color:var(--muted)}.donut-area{width:190px;display:grid;place-items:center}.donut{--value:75;width:140px;height:140px;border-radius:50%;background:conic-gradient(var(--primary) calc(var(--value)*1%),var(--green) 0 88%,var(--orange) 0);display:grid;place-items:center;position:relative}.donut:after{content:"";position:absolute;inset:20px;border-radius:50%;background:var(--surface)}.donut-label{position:relative;z-index:1;text-align:center}.donut-label strong{display:block;font-size:24px}.donut-label small{color:var(--muted);font-size:9px}.legend{display:flex;justify-content:center;gap:12px;margin-top:10px;color:var(--muted);font-size:9px}.legend i{display:inline-block;width:7px;height:7px;margin-right:4px;border-radius:50%}.legend .a{background:var(--primary)}.legend .b{background:var(--green)}.legend .c{background:var(--orange)}.activity-list{display:grid}.activity{display:grid;grid-template-columns:9px 1fr auto;gap:10px;padding:13px 0;border-top:1px solid var(--line);font-size:11px}.activity:first-child{border-top:0}.activity>i{width:7px;height:7px;margin-top:4px;border-radius:50%;background:var(--green)}.activity b{display:block;margin-bottom:4px}.activity small{color:var(--muted);font-size:9px}.activity time{color:var(--muted);font-size:9px}.progress-row{display:grid;grid-template-columns:1fr 46px;gap:9px;align-items:center;padding:10px 0;border-top:1px solid var(--line)}.progress-row:first-child{border-top:0}.progress-row b,.progress-row small{display:block;font-size:11px}.progress-row small{margin-top:4px;color:var(--muted);font-size:9px}.progress-track{height:6px;margin-top:9px;border-radius:6px;background:var(--surface-2);overflow:hidden}.progress-fill{height:100%;background:var(--primary);border-radius:6px}.score{font-size:12px;text-align:right}.page-toolbar{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-bottom:14px}.toolbar-group{display:flex;flex-wrap:wrap;gap:8px}.button{min-height:38px;padding:0 13px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--ink);font-size:11px;cursor:pointer}.button:hover{border-color:var(--primary)}.button.primary{border-color:var(--primary);background:var(--primary);color:#fff}.button.danger{color:var(--orange)}.button.ghost{background:transparent}.filter{height:38px;padding:0 10px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--ink);font-size:11px}.table-panel{padding:0;overflow:hidden}.table-scroll{overflow:auto}.data-table{width:100%;border-collapse:collapse;font-size:11px}.data-table th{padding:12px 13px;background:var(--surface-2);color:var(--muted);text-align:left;font-weight:600;white-space:nowrap}.data-table th.sortable{cursor:pointer}.data-table td{padding:13px;border-top:1px solid var(--line);vertical-align:middle}.data-table tbody tr:hover{background:var(--surface-2)}.data-table input[type="checkbox"]{accent-color:var(--primary)}.row-title{font-weight:700}.subtext{display:block;margin-top:4px;color:var(--muted);font-size:9px}.badge{display:inline-block;padding:4px 8px;border-radius:10px;background:var(--green-soft);color:var(--green);font-size:9px;white-space:nowrap}.badge.orange{background:var(--orange-soft);color:var(--orange)}.badge.purple{background:var(--primary-soft);color:var(--primary)}.row-actions{display:flex;gap:5px}.row-actions button{padding:4px 7px;border:0;border-radius:6px;background:var(--surface-2);color:var(--muted);font-size:10px;cursor:pointer}.row-actions button:hover{color:var(--primary)}.empty{padding:54px 20px;text-align:center;color:var(--muted)}.empty strong{display:block;margin-bottom:7px;color:var(--ink)}.pagination{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-top:1px solid var(--line);color:var(--muted);font-size:10px}.pagination-buttons{display:flex;gap:5px}.pagination button{min-width:30px;height:29px;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--ink);cursor:pointer}.pagination button.active{background:var(--primary);color:#fff}.management-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:14px}dialog{width:min(650px,calc(100% - 30px));max-height:90vh;padding:0;border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);box-shadow:0 30px 100px rgba(0,0,0,.25)}dialog::backdrop{background:rgba(17,20,17,.55);backdrop-filter:blur(3px)}dialog form{padding:22px}dialog header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:20px}dialog h2{font:500 22px Georgia,"Songti SC",serif;margin:4px 0}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field{display:grid;gap:6px}.field.full{grid-column:1/-1}.field label{font-size:10px;color:var(--muted)}.field input,.field select,.field textarea{width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--surface-2);color:var(--ink);font:inherit;font-size:12px}.field textarea{min-height:95px;resize:vertical}dialog footer{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}.import-box{display:grid;gap:14px;padding:18px;border:1px dashed var(--line);border-radius:12px;background:var(--surface-2)}.import-box label{display:grid;gap:5px}.import-box label span,.import-box p{color:var(--muted);font-size:10px}.import-box .check{display:flex;align-items:center;gap:7px;font-size:11px}.toast{position:fixed;right:24px;bottom:24px;z-index:100;max-width:360px;padding:12px 16px;border-radius:10px;background:var(--nav);color:#fff;box-shadow:var(--shadow);font-size:11px;transform:translateY(90px);opacity:0;transition:.25s}.toast.show{transform:none;opacity:1}.danger-zone{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px;border:1px solid var(--orange);border-radius:13px;background:var(--orange-soft)}.danger-zone b{display:block;font-size:12px}.danger-zone span{color:var(--muted);font-size:10px}
.feedback-alert{border-color:#efb8a8;background:var(--orange-soft)}.attention-count{display:flex;align-items:center;padding:0 11px;border-radius:9px;background:var(--primary-soft);color:var(--primary);font-size:10px}.report-feed{display:grid;gap:14px}.report-card{padding:20px;border:1px solid var(--line);border-radius:16px;background:var(--surface);box-shadow:var(--shadow)}.report-card.unread{border-color:#9d8be8;box-shadow:0 0 0 3px rgba(108,86,196,.09),var(--shadow)}.report-card>header,.report-card>footer{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.report-card h2{margin:8px 0 0;font:500 19px Georgia,"Songti SC",serif}.report-score{white-space:nowrap;color:var(--primary);font-size:14px}.new-dot{display:inline-block;margin-left:7px;padding:4px 8px;border-radius:10px;background:var(--primary);color:#fff;font-size:9px}.report-body{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:12px;margin:18px 0}.report-body section{padding:13px;border-radius:11px;background:var(--surface-2)}.report-body small{color:var(--muted);font-size:9px}.report-body p{margin:7px 0 0;white-space:pre-wrap;font-size:11px;line-height:1.65}.feedback-thread{display:grid;gap:9px;padding:14px;border-left:3px solid var(--primary);border-radius:0 11px 11px 0;background:var(--primary-soft)}.thread-item{padding:11px 13px;border-radius:10px;background:var(--surface)}.thread-item b{font-size:10px}.thread-item p{margin:6px 0;white-space:pre-wrap;font-size:11px;line-height:1.6}.student-message{margin-left:34px;border:1px solid #bfddce;background:var(--green-soft)}.reply-composer{display:grid;grid-template-columns:1fr auto;gap:9px;align-items:end}.reply-composer textarea{min-height:72px;padding:10px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--ink);font:inherit;font-size:11px;resize:vertical}.report-card>footer{align-items:center;margin-top:13px;padding-top:12px;border-top:1px solid var(--line)}
@media(max-width:1100px){.stats{grid-template-columns:repeat(2,1fr)}.dashboard-grid{grid-template-columns:1fr}.management-summary{grid-template-columns:1fr 1fr}.sidebar{width:78px}.brand b,.storage-card,.nav-button span,.nav-button em{display:none}.brand{padding-left:5px}.nav-button{justify-content:center}.main{margin-left:78px;width:calc(100% - 78px)}.chart-wrap{gap:8px}.donut-area{width:165px}}
@media(max-width:680px){.sidebar{inset:auto 0 0 0;width:auto;height:64px;padding:6px}.brand,.storage-card{display:none}.sidebar nav{display:flex;justify-content:space-around}.nav-button{padding:7px 8px}.nav-button:nth-child(6){display:none}.main{margin:0;width:100%;padding:22px 14px 82px}.topbar h1{font-size:24px}.global-search{width:42px}.global-search input{display:none}.top-actions .icon-button{display:none}.stats,.management-summary{grid-template-columns:1fr 1fr}.chart-wrap{height:auto;display:block}.bars{height:180px}.donut-area{width:100%;margin-top:20px}.page-toolbar{display:grid}.toolbar-group{display:grid;grid-template-columns:1fr 1fr}.toolbar-group .button,.toolbar-group .filter{width:100%}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.notice{align-items:flex-start}.data-table{min-width:720px}.danger-zone{align-items:flex-start;flex-direction:column}}
.hidden{display:none!important}.auth-screen{min-height:100vh;padding:28px clamp(24px,5vw,72px);background:radial-gradient(circle at 15% 85%,var(--green-soft),transparent 36%),radial-gradient(circle at 92% 10%,var(--primary-soft),transparent 32%),var(--bg)}.auth-brand{display:flex;align-items:center;gap:11px;font-size:17px}.auth-brand span{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:#dcefcf;color:#263326;font-size:24px}.auth-layout{min-height:calc(100vh - 100px);display:grid;grid-template-columns:1.1fr minmax(320px,440px);align-items:center;gap:8vw;max-width:1200px;margin:auto}.auth-story small,.login-card>small{color:var(--primary);font-size:10px;letter-spacing:.14em}.auth-story h1{margin:14px 0 20px;font:500 clamp(40px,5vw,68px)/1.12 Georgia,"Songti SC",serif}.auth-story p{max-width:570px;color:var(--muted);font-size:14px;line-height:1.8}.auth-features{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:30px;font-size:11px}.auth-features span{color:var(--green)}.login-card{padding:34px;border:1px solid var(--line);border-radius:18px;background:var(--surface);box-shadow:0 25px 80px rgba(32,35,31,.12);display:grid;gap:16px}.login-card h2{margin:3px 0 0;font:500 27px Georgia,"Songti SC",serif}.login-card>p{margin:-8px 0 5px;color:var(--muted);font-size:11px}.login-card label{display:grid;gap:7px;color:var(--muted);font-size:10px}.login-card input{height:43px;padding:0 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2);color:var(--ink);font-size:12px}.login-card .button{width:100%;height:43px}.login-error{min-height:15px!important;margin:0!important;color:var(--orange)!important;font-size:10px!important}.demo-accounts{display:grid;gap:5px;padding-top:14px;border-top:1px solid var(--line);color:var(--muted);font-size:9px}.demo-accounts b{color:var(--ink)}.role-chip{padding:4px 8px;border-radius:10px;background:var(--primary-soft);color:var(--primary);font-size:9px}.student-welcome{display:flex;justify-content:space-between;align-items:center;gap:16px}.quick-actions{display:flex;flex-wrap:wrap;gap:8px}.account-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.account-card{padding:16px;border:1px solid var(--line);border-radius:13px;background:var(--surface)}.account-card b,.account-card span{display:block}.account-card span{margin:5px 0;color:var(--muted);font-size:10px}.account-card footer{display:flex;gap:6px;margin-top:12px}
@media(max-width:760px){.auth-layout{grid-template-columns:1fr;gap:30px;padding:45px 0}.auth-story h1{font-size:42px}.auth-features{display:none}.login-card{padding:25px}.account-grid{grid-template-columns:1fr}.top-actions #change-password{display:none}.report-body{grid-template-columns:1fr}.reply-composer{grid-template-columns:1fr}.student-message{margin-left:0}.report-card>header{align-items:center}}
.announcement-list{display:grid;gap:14px}.announcement-card{border-left:4px solid transparent}.announcement-card.announcement-unread{border-left-color:var(--primary);box-shadow:0 8px 28px rgba(109,86,207,.14)}.announcement-card p{line-height:1.75;margin:14px 0}.announcement-card footer{display:flex;gap:8px;justify-content:flex-end}.announcement-popup{max-width:620px}.announcement-popup-body{padding:22px}.announcement-popup-content{white-space:pre-wrap;line-height:1.8;font-size:16px;padding:18px 0;max-height:48vh;overflow:auto}.announcement-popup footer{display:flex;justify-content:flex-end}
.planner-layout{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(300px,.8fr);gap:16px}.calendar-panel{overflow:hidden}.calendar-weekdays,.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}.calendar-weekdays span{text-align:center;color:var(--muted);font-size:12px;padding:8px}.calendar-day{min-height:112px;border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:9px;text-align:left;display:flex;flex-direction:column;gap:5px;color:var(--ink);cursor:pointer}.calendar-day:hover{border-color:var(--primary);transform:translateY(-1px)}.calendar-day.muted{background:transparent;border-color:transparent;cursor:default}.calendar-event,.calendar-todo{font-size:11px;padding:4px 6px;border-radius:7px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;background:var(--primary-soft);color:var(--primary)}.calendar-todo{background:var(--green-soft);color:var(--green)}.calendar-todo.done{text-decoration:line-through;opacity:.55}.todo-list{display:grid;gap:9px}.todo-item{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;padding:11px;border:1px solid var(--line);border-radius:12px}.todo-item.done{opacity:.58}.todo-item.done b{text-decoration:line-through}.todo-item small{display:block;color:var(--muted);margin-top:4px}.todo-check{border:0;background:transparent;color:var(--primary);font-size:22px;cursor:pointer}
@media(max-width:1000px){.planner-layout{grid-template-columns:1fr}.calendar-day{min-height:90px}}@media(max-width:680px){.calendar-day{min-height:65px;padding:5px}.calendar-event,.calendar-todo{display:none}}
.attachment-picker{display:grid;gap:9px}.attachment-picker>small{color:var(--muted);font-size:9px}.attachment-list{display:flex;flex-wrap:wrap;gap:7px;margin-top:8px}.attachment-list a{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--primary);font-size:10px;text-decoration:none}.attachment-list a:hover{border-color:var(--primary)}.attachment-list small{color:var(--muted)}.report-attachments{margin:-4px 0 15px;padding:12px;border:1px dashed var(--line);border-radius:11px}.report-attachments>small{color:var(--muted);font-size:9px}
.literature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.literature-card{display:flex;flex-direction:column}.literature-card>header{display:flex;justify-content:space-between;gap:14px}.literature-card h2{margin:9px 0 4px;font:500 20px Georgia,"Songti SC",serif}.literature-meta{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:10px}.literature-authors{margin:0;color:var(--muted);font-size:10px}.literature-summary{min-height:60px;line-height:1.75;font-size:11px}.reader-zone{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:15px;padding:12px;border-radius:11px;background:var(--green-soft)}.reader-zone b,.comment-zone>b{font-size:10px}.reader-list{display:flex;flex-wrap:wrap;gap:5px;margin-top:7px}.reader-list span{padding:3px 7px;border-radius:9px;background:var(--surface);color:var(--green);font-size:9px}.reader-list small,.comment-thread>small{color:var(--muted);font-size:9px}.comment-zone{margin-top:14px;padding-top:13px;border-top:1px solid var(--line)}.comment-thread{display:grid;gap:7px;margin:10px 0}.literature-comment{display:grid;grid-template-columns:auto 1fr auto;gap:9px;padding:9px 11px;border-radius:9px;background:var(--surface-2);font-size:10px}.literature-comment span{font-weight:700}.literature-comment p{margin:0;white-space:pre-wrap;line-height:1.5}.literature-comment time{color:var(--muted);font-size:8px}.comment-composer{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:end}.comment-composer textarea{min-height:58px;padding:9px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2);color:var(--ink);font:inherit;font-size:10px;resize:vertical}
@media(max-width:900px){.literature-grid{grid-template-columns:1fr}}@media(max-width:680px){.reader-zone,.literature-card>header{align-items:flex-start;flex-direction:column}.comment-composer{grid-template-columns:1fr}.literature-comment{grid-template-columns:1fr}.literature-comment time{justify-self:start}}
.literature-doi{display:inline-block;margin:2px 0 5px;color:var(--primary);font-size:10px;text-decoration:none}.literature-doi:hover{text-decoration:underline}.literature-stats{display:flex;align-items:center;gap:12px;margin-top:10px;color:var(--muted);font-size:10px}.literature-stats .button{min-height:30px}