:root{--blue:#1976b9;--blue-dark:#12578a;--gold:#ffb53d;--ink:#202b32;--muted:#71808a;--line:#dfe5e8;--canvas:#f6f8f9;--green:#257b63}*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink);font:16px/1.6 "Microsoft YaHei","PingFang SC",Arial,sans-serif;letter-spacing:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}button,a,input,select,textarea{outline-offset:4px}button:focus-visible,a:focus-visible{outline:3px solid #1976b980}button{border:1px solid var(--line);background:white;border-radius:6px;min-height:42px;padding:9px 16px;color:var(--ink);display:inline-flex;align-items:center;justify-content:center;gap:8px;white-space:normal}button:hover{background:#f0f5f8}svg{width:19px;height:19px;flex-shrink:0}.primary{background:var(--blue);border-color:var(--blue);color:white}.primary:hover{background:var(--blue-dark)}.text-button{border:0;background:transparent;padding:8px 10px}.icon-button{width:40px;min-height:40px;padding:8px;flex-shrink:0}.danger{color:#b63b3b}.primary.danger{background:#b63b3b;border-color:#b63b3b;color:white}.muted{color:var(--muted)}header{background:white;border-bottom:1px solid var(--line)}.header-inner{max-width:1240px;margin:auto;min-height:96px;display:flex;align-items:center;gap:46px;padding:20px 32px}.brand{display:flex;align-items:center;gap:18px;flex-shrink:0}.brand img{width:112px;height:40px;object-fit:contain}.brand span{font-size:21px;font-weight:750;border-left:1px solid var(--line);padding-left:18px}nav{display:flex;align-self:stretch;align-items:center;gap:28px}nav a{font-size:15px;position:relative;white-space:nowrap}nav a.active{color:var(--blue);font-weight:700}nav a.active:after{content:"";position:absolute;bottom:-20px;left:0;right:0;height:3px;background:var(--blue)}.header-actions{margin-left:auto;display:flex;gap:12px;white-space:nowrap}.header-actions button{font-size:14px}main{max-width:1240px;margin:0 auto;min-height:calc(100vh - 185px);padding:40px 32px 60px}.page-top{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:30px}.eyebrow{font-size:13px;font-weight:700;color:var(--blue);margin:0 0 8px}.page-top h1{font-size:32px;line-height:1.3;margin:0 0 12px;font-weight:750}.page-top p{margin:0;color:var(--muted);font-size:14px}.subject-switch{display:flex;background:#e9eef1;border-radius:6px;padding:4px;gap:3px}.subject-switch button{min-height:39px;background:transparent;border:0;min-width:90px;font-size:14px;padding:6px 18px}.subject-switch button.active{background:white;box-shadow:0 1px 3px #20344416;color:var(--blue);font-weight:700}.workspace{display:grid;grid-template-columns:180px minmax(0,1fr);gap:38px}.sidebar{padding-top:8px}.sidebar-label{font-size:12px;color:var(--muted);margin:0 0 15px 13px}.stage-link{display:flex;align-items:center;gap:12px;padding:14px;border-radius:6px;font-size:15px;margin-bottom:5px}.stage-link:hover{background:#eaf0f3}.stage-link.current{background:#e3eff8;color:var(--blue);font-weight:700}.stage-link small{margin-left:auto;color:var(--muted);font-size:12px;font-weight:400}.side-note{border-top:1px solid var(--line);margin-top:26px;padding:20px 12px;color:var(--muted);font-size:13px;line-height:1.9}.side-note strong{display:block;color:var(--ink);font-size:14px;margin:8px 0}.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--green);margin-right:6px}.stage-section{scroll-margin-top:22px;margin-bottom:32px}.section-heading{display:flex;align-items:center;gap:10px;margin-bottom:14px}.section-heading h2{margin:0;font-size:20px}.section-heading .index{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}.section-heading small{margin-left:auto;font-size:13px;color:var(--muted)}.grade-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.grade-card{background:white;border:1px solid var(--line);border-radius:8px;overflow:hidden;min-width:0;transition:border-color .18s}.grade-card:hover{border-color:#a2bed0}.grade-title{padding:18px 18px 14px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #eef1f3}.grade-title h3{font-size:18px;margin:0}.grade-title span{font-size:11px;color:#8d9aa2;letter-spacing:0}.terms{padding:6px 14px}.term{width:100%;display:flex;justify-content:space-between;border:0;border-radius:0;background:transparent;min-height:46px;padding:10px 4px;font-size:14px}.term+ .term{border-top:1px solid #f0f2f4}.term svg{width:16px;height:16px;color:#97a4ad}.term:hover{color:var(--blue);background:#f5faff}.term small{font-size:11px;color:var(--muted);margin-left:auto;margin-right:8px}.stage-section:nth-child(2) .section-heading h2{color:var(--green)}.stage-section:nth-child(3) .section-heading h2{color:#916219}footer{max-width:1176px;margin:auto;border-top:1px solid var(--line);padding:22px 0;display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:12px}footer div{display:flex;gap:22px;align-items:center}footer button{font-size:12px}footer a{display:flex;gap:6px;align-items:center}footer svg{width:14px;height:14px}dialog{width:min(530px,calc(100% - 32px));max-height:90dvh;border:1px solid var(--line);border-radius:8px;padding:26px;color:var(--ink);box-shadow:0 18px 80px #182c3b33}dialog::backdrop{background:#10233066}.dialog-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px;gap:12px}.dialog-top h2{font-size:23px;margin:0}.dialog-top button{border:0}form{display:grid;gap:16px}label{display:grid;gap:7px;font-size:14px;color:#4d5e69}input,select,textarea{width:100%;min-width:0;border:1px solid #ccd6dc;border-radius:5px;background:white;padding:10px 12px;color:var(--ink)}input:focus,select:focus,textarea:focus{border-color:var(--blue);outline:2px solid #1976b920}textarea{resize:vertical;min-height:100px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}.check-label{display:flex;align-items:flex-start;font-size:12px}.check-label input{width:17px;flex-shrink:0;margin-top:4px}.form-error{color:#b33131;font-size:14px;margin:0}.form-error:empty{display:none}.form-foot{font-size:14px;text-align:center;color:var(--muted);margin:14px 0 0}.link{color:var(--blue)}#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,14px);opacity:0;pointer-events:none;padding:12px 22px;background:#253b45;color:white;border-radius:6px;max-width:90%;z-index:20;transition:.2s}#toast.show{opacity:1;transform:translate(-50%,0)}.breadcrumbs{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px;margin-bottom:22px;flex-wrap:wrap}.breadcrumbs svg{width:14px}.empty{padding:70px 20px;text-align:center;background:white;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.empty>svg{width:38px;height:38px;color:#8ba0ad}.empty h2{font-size:21px;margin:15px 0 8px}.empty p{color:var(--muted);font-size:14px}.lesson-list{border-top:1px solid var(--line)}.lesson{display:flex;align-items:center;gap:25px;background:white;border-bottom:1px solid var(--line);padding:24px}.lesson-number{font-size:28px;color:#9eb4c1;min-width:45px;font-variant-numeric:tabular-nums}.lesson-body{flex:1;min-width:0}.lesson h2{font-size:18px;margin:0 0 6px;overflow-wrap:anywhere}.lesson p{font-size:14px;color:var(--muted);margin:0;white-space:pre-wrap;overflow-wrap:anywhere}.lesson a{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-size:14px;white-space:nowrap}.toolbar{display:flex;align-items:center;gap:12px;margin:20px 0;flex-wrap:wrap}.toolbar select{width:auto;min-width:130px}.toolbar .primary{margin-left:auto}.admin-tabs{display:flex;gap:24px;border-bottom:1px solid var(--line)}.admin-tabs button{border:0;background:transparent;border-radius:0;padding:12px 4px}.admin-tabs button.active{border-bottom:3px solid var(--blue);color:var(--blue);font-weight:700}.table-wrap{overflow-x:auto;background:white}table{border-collapse:collapse;width:100%;font-size:14px}th{text-align:left;background:#edf2f5;color:#637580;font-size:12px;font-weight:500}th,td{padding:16px;border-bottom:1px solid var(--line);vertical-align:middle}td small{display:block;color:var(--muted);font-size:12px}.row-actions{display:flex;gap:6px;align-items:center}.row-actions button{font-size:13px;padding:6px 10px;min-height:36px}.row-actions .icon-button{width:34px;padding:7px}.badge{font-size:12px;padding:4px 8px;border-radius:4px;white-space:nowrap;background:#fff0d6;color:#92630e}.badge.approved{background:#e6f3ec;color:#25704d}.badge.rejected{background:#faeaea;color:#a74444}.table-title{min-width:190px;overflow-wrap:anywhere}.notice{background:#edf4f8;border-left:3px solid var(--blue);padding:18px 22px;margin:20px 0;font-size:14px;white-space:pre-wrap}.account-list{display:grid;gap:12px;font-size:14px;margin-bottom:24px}.account-list span{color:var(--muted)}.account-actions{display:flex;gap:10px}.loading{padding:70px;text-align:center;color:var(--muted)}
#mobile-signup{display:none}
@media(max-width:760px){.table-wrap{overflow:visible}.table-wrap table,.table-wrap tbody{display:block}.table-wrap thead{display:none}.table-wrap tbody tr{display:grid;grid-template-columns:1fr 1fr;padding:12px;border-bottom:1px solid var(--line);gap:3px}.table-wrap tbody tr:last-child{border-bottom:0}.table-wrap td{border:0;padding:6px;min-width:0;overflow-wrap:anywhere}.table-wrap td:nth-child(1),.table-wrap td:nth-child(2){grid-column:1/-1}.table-wrap td:nth-child(1){color:var(--muted);font-size:13px}.table-wrap .table-title{min-width:0}.table-wrap .row-actions{flex-wrap:wrap}.table-wrap .row-actions button{min-height:40px}.table-wrap .row-actions .icon-button{width:40px}.table-wrap td:last-child .row-actions{justify-content:flex-end}}
@media(max-width:760px){#mobile-signup{display:inline-flex;font-size:13px;padding:0;min-height:26px;color:var(--blue)}}
@media(min-width:1100px){.sidebar{position:sticky;top:20px;align-self:start}}
@media(max-width:1050px){.header-inner{gap:22px;padding:20px 24px}.brand{gap:10px}.brand img{width:82px}.brand span{font-size:18px;padding-left:10px}nav{gap:18px}.header-actions{gap:4px}main{padding:30px 24px}.workspace{grid-template-columns:145px minmax(0,1fr);gap:24px}.subject-switch button{min-width:75px}.grade-title{padding:16px 13px}.terms{padding:5px 9px}footer{margin:0 24px}}
@media(max-width:760px){.header-inner{flex-wrap:wrap;gap:16px;padding:16px 20px}.brand{flex:1}.brand img{width:80px;height:30px}.brand span{font-size:18px}.header-actions{margin:0}.header-actions .text-button{display:none}.header-actions .primary{min-height:36px;padding:7px 10px;font-size:12px}nav{order:3;flex-basis:100%;gap:0;justify-content:space-between;padding:2px 15px 0}nav a.active:after{bottom:-16px}main{padding:28px 20px 40px}.page-top{align-items:flex-start;gap:18px;flex-direction:column;margin-bottom:24px}.page-top h1{font-size:28px}.subject-switch{width:100%}.subject-switch button{flex:1;min-width:0}.workspace{display:block}.sidebar{display:flex;gap:6px;margin:0 0 26px;padding:0}.sidebar-label,.side-note{display:none}.stage-link{margin:0;flex:1;justify-content:center;padding:11px 6px;font-size:14px}.stage-link small{display:none}.grade-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.grade-title{padding:14px 10px}.grade-title h3{font-size:16px}.grade-title span{display:none}.terms{padding:4px 8px}.term{font-size:12px;gap:3px;padding:9px 0}.term small{display:none}.term svg{width:13px}.section-heading h2{font-size:19px}.section-heading small{font-size:12px}.stage-section{margin-bottom:28px}footer{margin:0 20px;align-items:flex-start;gap:12px;flex-wrap:wrap}footer div{gap:16px}.lesson{gap:12px;padding:20px 10px;flex-wrap:wrap}.lesson-number{font-size:23px;min-width:30px}.lesson a{margin-left:42px}.lesson-body{flex-basis:calc(100% - 60px)}.toolbar select{flex:1;width:100px;min-width:90px}.toolbar .primary{margin-left:0}.table-wrap{border:1px solid var(--line)}th,td{padding:12px}.empty{padding:50px 15px}dialog{padding:22px}.dialog-top h2{font-size:21px}.form-row{gap:10px}}