:root{font-family:"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;color:#172b25;background:#f5f7f5;font-size:14px;font-synthesis:none;text-rendering:optimizeLegibility;--ink:#172b25;--muted:#718079;--line:#e3eae5;--green:#176b53;--green-strong:#10573f;--green-soft:#e9f4ed;--orange:#df8251;--surface:#fff;--canvas:#f5f7f5;--shadow:0 12px 36px rgba(25,55,42,.08)}
*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,select{font:inherit}button{min-height:38px;border:1px solid #d7e1db;border-radius:7px;background:#fff;color:var(--ink);padding:8px 13px;font-weight:600;transition:background .16s,border-color .16s,transform .16s,box-shadow .16s}button:hover{border-color:#8aafa0;background:#f8fbf9}button:active{transform:translateY(1px)}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #91c7a94a;outline-offset:1px}button.primary{background:var(--green);border-color:var(--green);color:white}button.primary:hover{background:var(--green-strong);border-color:var(--green-strong)}button.danger{color:#a73e35;border-color:#efd6d2;background:#fffafa}button.danger:hover{background:#fff0ed}button:disabled{opacity:.5;cursor:not-allowed}input,select{min-height:40px;min-width:0;border:1px solid #d8e1dc;border-radius:7px;background:#fff;color:var(--ink);padding:9px 11px}input::placeholder{color:#a2ada7}input[type=file]{max-width:220px;padding:6px;background:#fafcfb;font-size:12px}

.login{min-height:100vh;display:grid;place-items:center;padding:24px;background:var(--canvas)}.login form{width:min(100%,400px);display:grid;gap:16px;padding:36px;background:var(--surface);border:1px solid #e2e9e4;border-radius:12px;box-shadow:var(--shadow)}.login form:before{content:"LW";width:46px;height:46px;display:grid;place-items:center;border-radius:13px;background:var(--green);color:#fff;font-size:16px;font-weight:800;box-shadow:0 7px 16px #176b5330}.login h1{margin:0;font-size:25px;line-height:1.25;letter-spacing:0}.login p{margin:-9px 0 6px;color:var(--muted)}.login label{display:grid;gap:7px;font-weight:600}.login button{width:100%;margin-top:3px}

.shell{min-height:100vh;display:grid;grid-template-columns:256px minmax(0,1fr)}.sidebar{position:sticky;top:0;height:100vh;background:#173c30;color:#fff;padding:25px 16px 18px;display:flex;flex-direction:column;gap:8px}.brand{display:flex;align-items:center;gap:11px;padding:0 10px 30px;font-size:17px;font-weight:800;letter-spacing:0}.brand:before{content:"LW";width:36px;height:36px;display:grid;place-items:center;border-radius:10px;background:#f0a477;color:#173c30;font-size:12px;font-weight:800}.side-label{padding:0 11px 9px;color:#9eb9ae;font-size:11px;font-weight:700;letter-spacing:.08em}.class-list{display:grid;gap:4px}.class-btn,.nav-btn{position:relative;width:100%;min-height:42px;text-align:left;background:transparent;color:#d6e4dd;border:1px solid transparent;padding:10px 12px;border-radius:7px;font-weight:500;white-space:normal}.class-btn:hover,.nav-btn:hover{background:#ffffff0d;border-color:#ffffff12;color:#fff}.class-btn.active,.nav-btn.active{background:#ffffff17;border-color:#ffffff1a;color:#fff;font-weight:700}.class-btn.active:before{position:absolute;content:"";left:-17px;top:9px;bottom:9px;width:3px;border-radius:0 3px 3px 0;background:#f0a477}.sidebar footer{margin-top:auto;border-top:1px solid #ffffff20;padding:16px 7px 2px;color:#deebe4;display:grid;gap:11px}.sidebar footer span{font-size:12px}.sidebar footer button{background:transparent;color:white;border-color:#ffffff36;justify-self:start}.main{min-width:0}.topbar{height:76px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 36px}.topbar h1{font-size:20px;font-weight:700;margin:0}.topbar .form-row{gap:8px}.topbar #new-class{background:var(--green-soft);color:var(--green-strong);border-color:#d6e8dc}.topbar #manage-teachers{background:white}.content{padding:28px 36px 54px;max-width:1530px;margin:auto}.content>.toolbar:first-child{min-height:38px;margin-bottom:13px}.content>.toolbar:first-child>.muted{font-size:12px;font-weight:600;letter-spacing:.02em}.content>.toolbar:first-child #display-button{color:var(--green-strong);border-color:#d0e4d7;background:#f5faf6}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:8px 0 23px}.tabs button{position:relative;border:0;border-radius:0;background:transparent;color:#69776f;padding:12px 15px 14px;min-height:44px;font-weight:600}.tabs button:hover{background:#f3f7f4;color:var(--green)}.tabs button.active{color:var(--green-strong)}.tabs button.active:after{position:absolute;content:"";height:3px;bottom:-1px;left:13px;right:13px;border-radius:3px 3px 0 0;background:var(--green)}.toolbar{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:17px}.toolbar h2{font-size:17px;margin:0 auto 0 0;font-weight:700}.toolbar select,.toolbar input{max-width:190px}

.stat-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px;margin:4px 0 19px}.stat{position:relative;min-height:105px;background:#fff;border:1px solid var(--line);border-radius:9px;padding:16px 18px;color:#68766e;font-size:12px;font-weight:600;box-shadow:0 2px 5px #193a2b05}.stat:after{position:absolute;content:"";right:15px;top:15px;width:8px;height:8px;border-radius:50%;background:#83b99a}.stat:nth-child(3):after{background:#e5ad4d}.stat:nth-child(4):after{background:#df8251}.stat strong{display:block;color:var(--ink);font-size:28px;line-height:1;margin-top:13px;font-weight:700;font-variant-numeric:tabular-nums}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:9px;background:#fff;box-shadow:0 2px 5px #193a2b05}table{border-collapse:collapse;width:100%;white-space:nowrap;text-align:left}th,td{height:55px;padding:10px 16px;border-bottom:1px solid #edf1ee}th{height:43px;background:#f8faf8;font-size:11px;color:#75837b;font-weight:700;letter-spacing:.035em}td{font-size:13px}tbody tr{transition:background .13s}tbody tr:hover{background:#fbfdfb}tr:last-child td{border-bottom:0}.student-cell{display:flex;align-items:center;gap:11px;font-weight:600}.avatar{height:36px;width:36px;border-radius:10px;object-fit:cover;background:#e7f0e9;display:grid;place-items:center;color:#3f735c;font-weight:700;flex:none}.avatar.large{height:68px;width:68px;border-radius:18px;font-size:23px}.muted{color:var(--muted)}.pill{display:inline-flex;align-items:center;justify-content:center;min-width:55px;padding:5px 9px;border-radius:99px;background:#eef2ef;color:#596b60;font-size:11px;font-weight:700}.pill.present{background:#e5f3e9;color:#237048}.pill.late{background:#fff1dc;color:#9a6100}.pill.leave{background:#e9f0fc;color:#46659a}.pill.absent{background:#fce9e6;color:#a43b31}.empty{padding:58px 20px;text-align:center;color:var(--muted);background:#fff;border:1px dashed #cbd9d0;border-radius:9px}.rank-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.rank-item{min-height:80px;background:#fff;border:1px solid var(--line);border-radius:9px;padding:13px 15px;display:flex;align-items:center;gap:12px;box-shadow:0 2px 5px #193a2b05}.rank-item .number{display:grid;place-items:center;width:28px;height:28px;border-radius:8px;background:#eff5f0;font-size:13px;font-weight:800;color:var(--green)}.rank-item:nth-child(1) .number{background:#fff0dc;color:#aa651a}.rank-item strong{margin-left:auto;font-size:15px;color:var(--green-strong);font-variant-numeric:tabular-nums}.panel{background:#fff;border:1px solid var(--line);border-radius:9px;margin:16px 0;padding:22px;box-shadow:0 2px 5px #193a2b05}.panel h2{font-size:16px;margin:0 0 17px}.panel p{line-height:1.7;font-size:12px;margin:14px 0 0}.form-row{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.form-row input{flex:1;min-width:120px}.panel .form-row select{min-width:145px}.panel .form-row button{min-width:120px}
.student-entry-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:5px 0 15px;padding:12px 15px;background:#edf5ef;border:1px solid #dbe9de;border-radius:9px}.student-entry-bar>div:first-child{display:flex;align-items:center;gap:12px}.student-entry-bar>div:first-child span{color:#62766a;font-size:12px}.student-entry-bar>div:first-child strong{color:#185b40;font-size:13px;letter-spacing:.04em}.entry-actions{display:flex;align-items:center;gap:7px}.entry-actions button{min-height:34px;font-size:11px;padding:6px 10px}.entry-actions .pause{color:#a15b3f;border-color:#ecd7cb;background:#fffaf7}.entry-actions .resume{color:var(--green);border-color:#cfe1d3;background:#fff}

.display{min-height:100vh;background:var(--canvas)}.display header{min-height:82px;padding:18px 34px;background:#173c30;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:20px}.display header h1{margin:0;font-size:22px;font-weight:700}.display header button{background:#fff;color:var(--green-strong);border:0}.display .content{max-width:1600px;padding-top:27px}.display .toolbar{margin-bottom:20px}.display .toolbar h2{font-size:16px}.display-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(164px,1fr));gap:13px}.display-student{min-height:180px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 12px;text-align:center;box-shadow:0 3px 10px #193a2b06}.display-student .avatar{margin:0 auto 11px}.display-student strong{display:block;margin-bottom:10px;font-size:15px}.display-student .pill{min-width:67px}.display-student small{display:block;color:#829087;margin-top:10px;font-size:11px}.modal-backdrop{position:fixed;inset:0;background:#122b2280;backdrop-filter:blur(3px);display:grid;place-items:center;padding:20px;z-index:10}.modal{width:min(100%,470px);max-height:min(85vh,760px);overflow:auto;background:#fff;padding:26px;border:1px solid #e3eae5;border-radius:12px;box-shadow:0 24px 70px #10291e35;display:grid;gap:15px}.modal h2{margin:0 0 3px;font-size:18px}.modal label{display:grid;gap:7px;font-size:13px;font-weight:600}.modal label:has(input[type=checkbox]){display:flex;align-items:center}.modal input[type=checkbox]{min-width:auto;min-height:auto;accent-color:var(--green)}.modal footer{display:flex;justify-content:flex-end;gap:8px;margin-top:5px}.modal footer button{min-width:86px}#toast{position:fixed;right:24px;bottom:24px;background:#183c30;color:#fff;border-radius:8px;padding:12px 16px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .2s;max-width:min(360px,calc(100vw - 32px));z-index:20}#toast.show{opacity:1}#mobile-logout{display:none}

@media(max-width:1000px){.shell{grid-template-columns:218px minmax(0,1fr)}.topbar{padding:0 24px}.content{padding:23px 24px 44px}.stat-row{gap:10px}.stat{padding:14px}.rank-grid{grid-template-columns:repeat(auto-fill,minmax(195px,1fr))}}
@media(max-width:760px){.shell{display:block}.sidebar{position:relative;top:auto;height:auto;padding:12px 15px 10px;display:block}.brand{padding:0 3px 12px;font-size:15px}.brand:before{width:30px;height:30px;border-radius:9px}.side-label,.sidebar footer{display:none}.class-list{display:flex;overflow:auto;gap:6px;scrollbar-width:none}.class-list::-webkit-scrollbar{display:none}.class-btn{width:auto;min-height:35px;white-space:nowrap;padding:7px 12px;font-size:12px;background:#ffffff0c}.class-btn.active:before{display:none}.topbar{min-height:62px;height:auto;padding:10px 16px}.topbar h1{font-size:17px}.topbar .form-row{gap:6px}.topbar button{min-height:35px;padding:7px 10px;font-size:11px}#mobile-logout{display:inline-block}.content{padding:17px 15px 35px}.content>.toolbar:first-child{margin-bottom:8px}.tabs{gap:0;margin:7px 0 18px;overflow-x:auto;scrollbar-width:none}.tabs::-webkit-scrollbar{display:none}.tabs button{flex:1 0 auto;padding:10px 11px 12px;min-height:41px;font-size:12px}.tabs button.active:after{left:9px;right:9px}.toolbar{gap:7px}.toolbar h2{font-size:15px}.toolbar button,.toolbar select{min-height:36px;padding:7px 10px;font-size:12px}.stat-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-bottom:14px}.stat{min-height:84px;padding:12px 13px;font-size:11px}.stat:after{right:12px;top:12px;width:7px;height:7px}.stat strong{font-size:24px;margin-top:10px}.table-wrap{border-radius:8px}th,td{padding:9px 11px}th{font-size:10px}td{font-size:12px}.student-cell{gap:8px}.avatar{height:32px;width:32px;border-radius:9px}.panel{padding:17px 15px}.panel .form-row{align-items:stretch}.panel .form-row select,.panel .form-row input{max-width:none;flex:1 1 125px}.panel .form-row button{flex:1 1 100%}.rank-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.rank-item{min-height:69px;padding:9px;gap:7px}.rank-item .number{width:24px;height:24px;flex:none}.rank-item .avatar{width:30px;height:30px;flex:none}.rank-item>span:not(.number):not(.avatar){font-size:12px;overflow:hidden;text-overflow:ellipsis}.rank-item strong{font-size:12px;white-space:nowrap}.display header{min-height:68px;padding:13px 16px}.display header h1{font-size:17px}.display header button{min-height:35px;font-size:12px;padding:7px 10px}.display .content{padding:19px 15px}.display-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.display-student{min-height:155px;padding:15px 9px}.display-student .avatar{width:58px;height:58px;border-radius:16px}.display-student strong{font-size:13px}.modal{padding:21px;border-radius:11px}#toast{right:16px;bottom:16px}}
@media(max-width:760px){.student-entry-bar{align-items:flex-start;flex-direction:column;gap:10px;padding:10px 12px}.student-entry-bar>div:first-child{width:100%;justify-content:space-between}.entry-actions{width:100%}.entry-actions button{flex:1}}
@media(max-width:390px){.topbar h1{max-width:82px;line-height:1.2}.topbar .form-row button{padding:7px 8px}.rank-grid{grid-template-columns:1fr}.display-grid{gap:7px}}
.button-link{min-height:38px;display:inline-flex;align-items:center;justify-content:center;padding:8px 13px;border:1px solid #d7e1db;border-radius:7px;background:#fff;color:var(--green-strong);font-weight:600;text-decoration:none}.button-link:hover{background:#f8fbf9;border-color:#8aafa0}.import-preview{max-height:310px;overflow:auto;border:1px solid var(--line);border-radius:7px}.import-preview table{min-width:100%;white-space:nowrap}.import-preview th,.import-preview td{height:39px;padding:8px 10px}.import-errors{padding:11px 13px;border:1px solid #f0d6d2;border-radius:7px;background:#fff7f5;color:#9c3c34;font-size:12px}.import-errors ul{margin:8px 0 0;padding-left:19px;max-height:130px;overflow:auto}.import-errors li{margin:4px 0}.import-note{font-size:12px;line-height:1.6;margin:0}.modal:has(.import-preview){width:min(100%,620px)}
.inactive-panel{margin-top:24px}.inactive-panel h2{font-size:16px;margin:0 0 6px}.inactive-panel p{margin:0 0 14px}
.overview-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:4px 0 18px}.overview-heading h2{margin:0;font-size:22px}.overview-heading p{margin:5px 0 0}.overview-stats{margin-bottom:20px}.overview-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:18px}.overview-grid .panel{margin:0}.overview-grid h3{margin:0 0 10px;font-size:16px}.overview-panel-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.overview-session-list{display:grid;gap:7px}.overview-session-list button{width:100%;display:flex;align-items:center;justify-content:space-between;text-align:left;gap:10px;background:#f9fbf9;border:1px solid var(--line)}.overview-session-list button span:first-child{display:grid;gap:4px}.overview-session-list small{color:var(--muted)}.overview-open{color:#18765d}.overview-closed{color:#9b654a}.overview-actions{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}.overview-current{display:grid;gap:6px;padding:13px;background:#f4f8f4;border-radius:8px}.overview-current span{color:var(--muted);font-size:12px}
@media(max-width:760px){.overview-grid{grid-template-columns:1fr}.overview-heading h2{font-size:18px}.overview-heading button{min-height:36px;padding:7px 10px;font-size:12px}}
.display{background:#f2f6f2}.display .display-header{min-height:88px;padding:16px clamp(20px,4vw,72px);background:#173c30;display:flex;align-items:center;justify-content:space-between;gap:20px}.display-brand{display:flex;align-items:center;gap:14px}.display-brand-mark{width:48px;height:48px;display:grid;place-items:center;border-radius:13px;background:#efb783;color:#173c30;font-size:14px;font-weight:800}.display-brand>div>span{display:block;color:#bfdacb;font-size:12px;margin-bottom:4px}.display .display-header h1{font-size:24px;line-height:1.25}.display .display-main{max-width:1680px;margin:auto;padding:28px clamp(18px,3vw,48px) 32px}.display-hero{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:22px}.display-eyebrow{color:#438166;font-size:13px;font-weight:700}.display-hero h2{margin:6px 0 5px;font-size:clamp(26px,2.2vw,36px)}.display-hero p{margin:0;color:var(--muted);font-size:13px}.display-session-picker{display:grid;gap:6px;color:var(--muted);font-size:12px}.display-session-picker select{min-width:250px;max-width:380px;background:#fff}.display-summary{display:grid;grid-template-columns:minmax(260px,2fr) repeat(5,minmax(90px,1fr));gap:10px;margin-bottom:22px}.display-summary>div{min-height:130px;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 4px 14px #193a2b08}.display-summary>div>span{display:block;color:#62796c;font-size:12px;font-weight:600}.display-summary strong{display:block;margin:10px 0 2px;font-size:32px;line-height:1.1;color:#193b2c;font-variant-numeric:tabular-nums}.display-summary strong small{font-size:17px;color:#7d8d82}.display-summary-primary{background:#eaf4ed!important;border-color:#cfe4d4!important}.display-summary-primary strong{font-size:40px}.display-summary-primary>span:last-child{font-size:11px;color:#468563}.display-progress-track{height:8px;margin:10px 0 5px;border-radius:99px;background:#d3e6d8;overflow:hidden}.display-progress-track div{height:100%;border-radius:inherit;background:#2b8a5e;transition:width .3s}.display-summary-item.is-waiting{border-top:4px solid #dc9363}.display-roster{padding:23px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 6px 22px #193a2b09}.display-roster-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin-bottom:20px}.display-roster-head h3{margin:0 0 5px;font-size:19px}.display-roster-head p{margin:0;color:var(--muted);font-size:12px}.display-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.display-filters{display:flex;gap:4px;padding:4px;background:#f2f6f2;border-radius:9px}.display-filters button{border:0;background:transparent;color:#52685a}.display-filters button.active{background:#fff;color:#176b53;box-shadow:0 1px 6px #173c3016}.display .display-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,205px));justify-content:center;gap:14px;max-width:none;padding:0}.display .display-student{min-height:190px;padding:17px 12px 14px;border:1px solid var(--line);border-top:4px solid #d59b72;border-radius:11px;box-shadow:none}.display .display-student.present{border-top-color:#55a673}.display .display-student.late{border-top-color:#e5a653}.display .display-student.leave{border-top-color:#729acb}.display .display-student.absent{border-top-color:#b77e7e}.display .display-student .avatar{width:68px;height:68px;border-radius:18px;margin:0 auto 10px;font-size:25px}.display .display-student strong{font-size:17px;margin-bottom:8px}.display .display-student .pill{font-size:12px;min-width:72px}.display .display-student small{font-size:12px;margin-top:9px}.display-empty{grid-column:1/-1;display:grid;place-items:center;min-height:160px;color:var(--muted);text-align:center}.display-footer{padding:14px 4px 0;text-align:right;color:#809087;font-size:11px}
.display-header-actions{display:flex;align-items:center;gap:8px}
@media(max-width:1100px){.display-summary{grid-template-columns:repeat(5,minmax(0,1fr))}.display-summary-primary{grid-column:1/-1}.display-summary>div{min-height:104px}.display-summary-primary{min-height:130px!important}}
@media(max-width:760px){.display .display-header{min-height:70px;padding:12px 16px}.display-brand-mark{width:38px;height:38px;border-radius:10px;font-size:11px}.display-brand>div>span{font-size:10px}.display .display-header h1{font-size:16px}.display .display-main{padding:19px 14px 28px}.display-hero{display:grid;gap:14px}.display-hero h2{font-size:24px}.display-session-picker select{min-width:0;max-width:100%;width:100%}.display-summary{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.display-summary-primary{grid-column:1/-1}.display-summary>div{min-height:86px;padding:13px 15px}.display-summary strong{font-size:27px}.display-roster{padding:16px 12px}.display-roster-head{display:grid;gap:14px}.display-roster-head h3{font-size:17px}.display-controls{justify-content:space-between}.display-filters{max-width:100%;overflow:auto}.display-filters button{font-size:11px;white-space:nowrap;padding:7px 9px}.display .display-grid{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:9px}.display .display-student{min-height:164px;padding:12px 8px}.display .display-student .avatar{width:56px;height:56px;border-radius:15px}.display .display-student strong{font-size:14px}.display .display-student .pill{font-size:11px}}
@media(max-width:760px){.button-link{min-height:36px;padding:7px 10px;font-size:12px}.content .toolbar:has(#import-students){gap:7px}.content .toolbar:has(#import-students) h2{flex-basis:100%}.content .toolbar:has(#import-students) .button-link,.content .toolbar:has(#import-students)>button{flex:1}}