@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap');
:root{--navy:#071730;--ink:#172b49;--blue:#1766ea;--muted:#8390a3;--line:#e9eef5;--red:#d52f3e}*{box-sizing:border-box}body{margin:0;background:#f5f7fb;color:var(--ink);font-family:'Noto Sans SC','Microsoft YaHei',sans-serif;font-size:13px;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{outline-offset:4px}button{cursor:pointer;border:0}a{color:var(--blue);text-decoration:none}button:disabled{cursor:wait;opacity:.6}[hidden]{display:none!important}.logo{display:inline-flex;background:#fff;padding:9px 12px;border-radius:9px}.logo img{display:block;width:190px;height:auto}.eyebrow{font-size:9px;letter-spacing:2.6px;font-weight:600;color:var(--blue);margin:0 0 12px}.muted{color:var(--muted);line-height:1.8;font-size:12px}.login-screen{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}.login-story{background:var(--navy);color:white;position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;padding:46px 58px;isolation:isolate}.login-story:after{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#071730f0,#07173088),url('assets/course-poster.png') center 45%/cover;opacity:.65}.login-story .logo{align-self:flex-start}.login-story-copy{margin:80px 0}.login-story .eyebrow{color:#70deff}.login-story h1{font-size:38px;line-height:1.6;letter-spacing:-1px;font-weight:700}.login-story h1 span{color:#69e1ff}.login-story-copy>p:not(.eyebrow){color:#b6cbe5;line-height:2;font-size:13px}.story-pills{display:flex;gap:10px;margin-top:28px}.story-pills span{font-size:11px;border:1px solid #8cceff44;border-radius:5px;padding:6px 12px;background:#19496c44}.brand-line{font-size:11px;letter-spacing:2px;color:#9cb3cf}.login-panel{display:grid;place-items:center;padding:40px}.login-box{max-width:370px;width:100%}.little-mark{font-size:45px;color:var(--blue);display:block;margin-bottom:26px}.login-box h2{font-size:25px;margin:0;letter-spacing:-.8px}.login-box .muted{margin:12px 0 32px}label{display:block;font-size:11px;font-weight:500;color:#5e6f88}input,select{border:1px solid #dfe5ee;border-radius:8px;background:#fff;color:var(--ink);padding:11px 12px;min-width:0}input:focus,select:focus{border-color:#689bf0;outline:3px solid #1766ea12}#admin-login input{display:block;width:100%;height:47px;margin:9px 0 22px;background:#fbfcff}.primary{background:var(--blue);color:white;border-radius:8px;padding:12px 19px;font-weight:500;font-size:12px}.primary:hover{background:#0955cd}.wide{width:100%;height:48px;display:flex;align-items:center;justify-content:space-between}.error{font-size:12px;color:var(--red);min-height:18px}.return-link{display:block;margin-top:26px;font-size:11px;color:#7e8ba0}.dashboard-shell{display:flex;min-height:100vh}.sidebar{background:var(--navy);color:#c6d6ed;width:240px;position:fixed;inset:0 auto 0 0;padding:30px 22px;display:flex;flex-direction:column}.sidebar .logo{padding:8px 10px}.sidebar .logo img{width:175px}.sidebar-label{font-size:8px;letter-spacing:1.7px;color:#708eaf;margin:35px 10px 9px}.sidebar h1{font-size:17px;font-weight:500;color:#ecf3ff;margin:0 10px 28px;letter-spacing:1px}nav{display:flex;flex-direction:column;gap:9px}.nav-button{background:transparent;color:#9eb3d0;text-align:left;display:flex;align-items:center;gap:12px;border-radius:9px;padding:14px 12px;font-size:12px}.nav-button>span:first-child{font-size:19px;line-height:1}.nav-button.active{background:#1766ea;color:white;box-shadow:0 5px 15px #0001}.nav-button:not(.active):hover{background:#ffffff0b}.nav-count{font-size:10px;margin-left:auto;background:#ffffff26;padding:2px 7px;border-radius:5px}.sidebar-note{margin:auto 10px 35px;display:flex;gap:12px;align-items:center;color:#6e8bab}.sidebar-note>span{font-size:34px;color:#5498d4}.sidebar-note p{font-size:11px;line-height:1.9;letter-spacing:1px}.sidebar-user{border-top:1px solid #ffffff12;padding-top:22px;display:flex;gap:10px;align-items:center}.user-avatar{display:grid;place-items:center;background:#1f3a5e;color:#9adaff;width:34px;height:34px;border-radius:10px}.sidebar-user strong{display:block;font-size:11px;font-weight:500}.sidebar-user small{font-size:9px;display:block;color:#7b94b4;margin-top:4px}.sidebar-user button{margin-left:auto;background:none;color:#9eb9d9;font-size:21px}.dashboard-main{margin-left:240px;padding:40px;flex:1;min-width:0;max-width:1800px}.dashboard-header{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:28px}.dashboard-header h2{font-size:28px;margin:0;font-weight:700;letter-spacing:-.8px}.dashboard-header .muted{margin:10px 0 0}.header-actions{display:flex;gap:10px;align-items:center;flex-shrink:0}.outline-link,.secondary{border:1px solid #dce4ef;border-radius:7px;padding:10px 13px;font-size:11px;background:#fff;color:#536987;white-space:nowrap}.secondary:hover,.outline-link:hover{border-color:#7aa8ee;color:var(--blue)}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:26px}.stat{background:white;padding:21px 22px;border:1px solid var(--line);border-radius:12px;position:relative;overflow:hidden}.stat:first-child{background:#edf5ff;border-color:#daeaff}.stat>span{font-size:11px;color:#72839b}.stat strong{display:block;font-size:33px;font-family:Bahnschrift,sans-serif;font-weight:600;line-height:1;margin:15px 0 10px}.stat:first-child strong{color:var(--blue)}.stat small{color:#98a5b6;font-size:9px}.upload-card,.data-card{background:white;border:1px solid var(--line);border-radius:12px;margin-bottom:22px;overflow:hidden}.upload-card{padding:24px}.upload-intro{display:flex;align-items:flex-start;gap:15px}.upload-symbol{background:#edf5ff;color:#4586e8;display:grid;place-items:center;width:43px;height:43px;font-size:26px;border-radius:11px;flex-shrink:0}h3{font-size:14px;margin:0 0 7px;font-weight:600}.upload-intro p,.card-toolbar p{font-size:11px;color:#8b97aa;line-height:1.8;margin:0}.upload-intro a{font-size:11px;display:inline-block;margin-top:10px}.import-form{display:flex;align-items:flex-end;gap:12px;padding-top:24px}.owner-select select{display:block;margin-top:7px;min-width:175px;max-width:230px}.file-picker{flex:1;max-width:460px}.file-picker input{display:block;width:100%;margin-top:7px;padding:8px;font-size:10px}.file-picker input::file-selector-button{border:0;background:#edf3fc;padding:5px 9px;border-radius:4px;color:#4a75af;margin-right:12px;cursor:pointer}.file-label{display:none}.import-form .primary{min-height:41px;white-space:nowrap}.import-hint{font-size:10px;color:#9aa7b8;margin:15px 0 0;line-height:1.8}.card-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:23px 24px;border-bottom:1px solid var(--line)}.card-toolbar h3{display:flex;gap:8px;align-items:center}.count-pill{background:#eef4fc;color:#5d88bc;font-size:10px;font-weight:500;padding:3px 7px;border-radius:5px}.filters{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}.filters input,.card-toolbar>input{width:190px}.filters input,.filters select,.card-toolbar>input{padding:9px 10px;font-size:10px}.filters select{max-width:160px}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;text-align:left;white-space:nowrap}th{background:#fafbfd;font-size:10px;color:#8593a7;font-weight:500;padding:13px 20px;border-bottom:1px solid #eef2f7}td{padding:16px 20px;border-bottom:1px solid #f0f3f7;font-size:11px;color:#60718a}tbody tr:last-child td{border-bottom:0}td strong{font-size:12px;color:#293e5d;font-weight:500}td small{display:block;color:#9ba7b8;font-size:9px;margin-top:5px}td .red{display:inline;color:var(--red);margin-left:5px;font-size:11px}.badge{font-size:9px;padding:4px 8px;border-radius:5px;display:inline-block}.badge.on{background:#e9f7f1;color:#3c9c7a}.badge.off{background:#f0f2f6;color:#99a4b4}.badge.viewed{background:#edf4ff;color:#4f87da}.text-action{background:transparent;color:#4583d9;padding:5px;font-size:10px}.text-action.disable{color:#c76a74}.empty-state{text-align:center;color:#9aa8ba;font-size:12px;padding:40px 20px;line-height:1.8}.notice{padding:13px 16px;border:1px solid #cce8da;background:#f0fbf5;color:#348269;font-size:12px;border-radius:9px;margin-bottom:20px;line-height:1.7;overflow-wrap:anywhere}.notice.bad{background:#fff2f3;border-color:#f8d8dd;color:#b74b5b}.dashboard-footer{display:flex;justify-content:space-between;font-size:9px;color:#a4b0c1;padding:12px 0;letter-spacing:1px}.dashboard-footer span:last-child{font-size:8px;letter-spacing:2px}.boot-message{padding:40px;text-align:center;color:#8190a8}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:1150px){.dashboard-main{padding:30px 24px}.sidebar{width:210px;padding:28px 17px}.sidebar .logo img{width:154px}.dashboard-main{margin-left:210px}.stats{gap:10px}.stat{padding:20px 16px}.card-toolbar{flex-wrap:wrap}.filters{justify-content:flex-start}.import-form{flex-wrap:wrap}.file-picker{min-width:200px}.login-story{padding:40px}.login-story h1{font-size:31px}}@media(max-width:760px){.login-screen{display:block}.login-story{padding:25px}.login-story .logo img{width:170px}.login-story-copy{margin:32px 0 10px}.login-story h1{font-size:27px;line-height:1.5;margin:12px 0}.login-story-copy>p:not(.eyebrow),.story-pills,.brand-line{display:none}.login-panel{padding:35px 25px 45px}.little-mark{display:none}.login-box h2{font-size:22px}.login-box .muted{margin-bottom:24px}.sidebar{position:relative;width:100%;padding:18px 20px;display:block}.sidebar .logo img{width:160px}.sidebar-label,.sidebar h1,.sidebar-note{display:none}.sidebar-user{position:absolute;right:20px;top:25px;padding:0;border:0;gap:8px}.sidebar-user .user-avatar{display:none}.sidebar-user button{margin-left:7px}.sidebar-user strong{max-width:95px;overflow:hidden;text-overflow:ellipsis}.sidebar nav{flex-direction:row;margin-top:20px;gap:5px}.nav-button{padding:11px 10px;font-size:11px;flex:1;justify-content:center;gap:6px;white-space:nowrap}.nav-button>span:first-child{font-size:16px}.nav-count{margin-left:0}.dashboard-shell{display:block}.dashboard-main{margin:0;padding:25px 16px}.dashboard-header{align-items:flex-start;flex-wrap:wrap;gap:16px}.dashboard-header h2{font-size:25px}.dashboard-header .muted{font-size:11px}.header-actions{width:100%;justify-content:flex-start}.stats{grid-template-columns:1fr 1fr;gap:10px}.stat{padding:17px}.stat strong{font-size:29px;margin:12px 0 9px}.stat small{font-size:8px}.upload-card{padding:20px 17px}.upload-intro{gap:12px}.upload-intro p{font-size:10px}.upload-symbol{width:36px;height:37px;font-size:23px}.import-form{gap:14px}.owner-select{width:100%}.owner-select select{width:100%;max-width:none}.file-picker{width:100%;max-width:none;flex:auto}.import-form .primary{width:100%}.card-toolbar{padding:20px 17px;gap:16px}.filters{width:100%}.filters input{width:100%}.filters select{flex:1;max-width:none}.card-toolbar>input{width:100%}td,th{padding:14px 16px}.dashboard-footer{font-size:8px;justify-content:center}.dashboard-footer span:last-child{display:none}}

.student-bulk-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 24px;border-bottom:1px solid var(--line);color:#8795a9;font-size:11px}.student-bulk-bar strong{color:#426b9f;font-weight:600}.danger-outline{padding:8px 12px;background:#fff6f7;border:1px solid #f1cdd3;color:#c53b50;border-radius:7px;font-size:11px}.danger-outline:disabled{cursor:default;opacity:.45}.delete-action{color:#d52f3e;margin-left:7px}.checkbox-column{width:40px}input[type=checkbox]{width:15px;height:15px;accent-color:var(--blue);padding:0;cursor:pointer;vertical-align:middle}.pagination{display:flex;flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;padding:17px 24px;border-top:1px solid var(--line);color:#8b98ab;font-size:10px}.pagination-buttons{display:flex;align-items:center;gap:7px}.pagination .secondary{padding:7px 10px;font-size:10px}.pagination .secondary:disabled{opacity:.4;cursor:default}.pagination #page-status{min-width:48px;text-align:center;color:#647d9d}dialog{border:1px solid #e4eaf3;border-radius:16px;width:min(440px,calc(100% - 36px));padding:28px;color:var(--ink);box-shadow:0 24px 90px #0003}dialog::backdrop{background:#07173099}dialog h2{font-size:20px;margin:0 0 16px}#delete-names{font-size:13px;font-weight:500;line-height:1.8;overflow-wrap:anywhere}.delete-explanation{font-size:12px;color:#8190a5;line-height:1.9}.dialog-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:22px}.danger-button{padding:11px 18px;border-radius:7px;background:#d52f3e;color:#fff;font-size:12px}.danger-button:hover{background:#bd2132}@media(max-width:760px){.student-bulk-bar{padding:14px 17px;font-size:10px}.pagination{padding:16px 17px;justify-content:center}.pagination>span{width:100%;text-align:center}.pagination-buttons{gap:6px}.pagination .secondary{padding:7px 9px}dialog{padding:24px}}