:root{color-scheme:light;--nav:#092b51;--ink:#10294d;--muted:#778baa;--blue:#0864ff;--line:#dce5f1;--canvas:#f4f8fd;--sidebar:clamp(235px,15.45vw,300px);font-family:Pretendard,-apple-system,BlinkMacSystemFont,'Apple SD Gothic Neo','Noto Sans KR','Malgun Gothic',sans-serif;font-size:14px;color:var(--ink)}*{box-sizing:border-box}body{margin:0;background:var(--canvas)}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-offset:4px}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}button,a{touch-action:manipulation}a{color:var(--blue);text-decoration:none}button{border:1px solid var(--line);border-radius:8px;background:white;padding:11px 17px;color:var(--ink);font-weight:650}button:hover:not(:disabled){background:#eff5ff;border-color:#a3bfff}button.primary{background:linear-gradient(110deg,#0861e6,#0872ff);border-color:transparent;color:white;box-shadow:0 3px 7px #0864ff12}button.primary:hover:not(:disabled){background:#0055e0}button.danger{color:#f04751;border-color:#ffc9ce}button.compact{padding:6px 12px;font-size:12px}button.text{border:0;background:transparent;color:var(--blue);padding:5px}.skip-link{position:fixed;top:-60px;left:16px;z-index:100;background:white;padding:12px}.skip-link:focus{top:10px}.shell{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);min-height:100vh}.sidebar{background:linear-gradient(135deg,#0a315a,#09284b 75%,#063153);color:#e2efff;position:fixed;inset:0 auto 0 0;width:var(--sidebar);display:flex;flex-direction:column;padding:16px 14px;z-index:25}.brand{height:71px;display:flex;align-items:center;gap:14px;padding:0 12px;font-size:24px;font-weight:850;color:white}.brand img{width:42px;height:57px;object-fit:contain}.nav{display:grid;gap:7px;margin-top:18px}.nav a{display:flex;align-items:center;gap:16px;padding:17px 20px;color:#e2efff;border-radius:9px;font-size:17px;font-weight:600}.nav a:hover{background:#ffffff10}.nav a.active{background:linear-gradient(110deg,#075dc4,#1176ff);color:white;box-shadow:0 4px 12px #00183420}.icon{width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.icon svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.sidebar-bottom{margin-top:auto;padding-top:22px}.sidebar-profile{border:1px solid #ffffff24;border-radius:10px;padding:15px;display:flex;gap:10px;align-items:center}.sidebar small{color:#a7bad6}.sidebar-bottom button{width:100%;text-align:left;margin-top:12px;background:transparent;border-color:#ffffff25;color:white}.body{grid-column:2;min-width:0}.topbar{height:78px;padding:12px 28px;background:white;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:18px;position:sticky;top:0;z-index:20}.global-search{display:flex;align-items:center;gap:10px;border:1px solid #d7e0ed;border-radius:8px;padding:0 15px;max-width:540px;flex:1;height:48px;color:#91a1bb}.global-search input{border:0;background:transparent;width:100%;min-width:0;padding:0;box-shadow:none}.global-search kbd{font:12px inherit;color:#93a1b9}.topbar-actions{margin-left:auto;display:flex;align-items:center;gap:14px;white-space:nowrap}.topbar .user{display:flex;align-items:center;gap:12px;padding-left:12px}.user div{display:grid;gap:5px}.user strong{font-size:15px}.user small{color:var(--muted)}.avatar{width:42px;height:42px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:#edf4ff;color:#729dd5;font-weight:750;font-size:18px;flex-shrink:0}.avatar.large{width:68px;height:68px;font-size:25px}main{padding:25px 28px 34px;min-width:0}.page-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:22px}.page-head h1{font-size:28px;letter-spacing:-.8px;line-height:1.3;margin:0 0 8px;font-weight:850}.page-head p{margin:0;color:var(--muted);font-size:15px;line-height:1.5}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:14px}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.panel{background:white;border:1px solid var(--line);border-radius:11px;padding:22px;min-width:0}.panel h2{font-size:19px;margin:0 0 16px;letter-spacing:-.4px}.panel h3{font-size:16px;margin:0 0 12px}.panel-title{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.panel-title h2{margin:0}.muted{color:var(--muted);font-size:13px;line-height:1.6}.hint{border:1px solid #cee0ff;border-radius:8px;background:#ecf4ff;color:#2767b9;padding:14px 16px;line-height:1.6;display:flex;align-items:flex-start;gap:10px}.hint.warning{background:#fffae9;border-color:#f3e2b8;color:#9d671b}.hint.error{background:#fff3f4;border-color:#ffd6db;color:#bf324a}.stats{background:white;border:1px solid var(--line);border-radius:10px;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));padding:18px 14px;margin-bottom:22px}.metric{display:flex;gap:14px;align-items:center;padding:4px 18px;border-right:1px solid #edf1f6}.metric:last-child{border:0}.metric .icon{width:46px;height:46px;background:#eef5ff;border-radius:50%;padding:12px;color:#4387e8}.metric small{display:block;color:var(--muted);font-size:13px}.metric b{display:block;font-size:22px;margin-top:5px}.metric em{font-style:normal;color:var(--muted);font-size:12px}.columns{display:grid;grid-template-columns:minmax(0,1.9fr) minmax(300px,1fr);gap:22px}.columns.equal{grid-template-columns:repeat(2,minmax(0,1fr))}.columns.wide{grid-template-columns:250px minmax(0,1fr) 320px}.stack{display:grid;gap:20px;align-content:start}.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:15px 0}.toolbar input{flex:1;min-width:180px}.toolbar select{width:auto;min-width:140px}.toolbar .grow{flex:1}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px}table{width:100%;border-collapse:collapse;text-align:left;font-size:13px}th{background:#f5f8fd;color:#5c7296;font-weight:650;padding:13px 12px;white-space:nowrap}td{border-top:1px solid #e9eff7;padding:12px;line-height:1.5;vertical-align:middle}tbody tr:hover{background:#f7faff}td strong{font-weight:700}td small{display:block;font-size:11px;color:var(--muted)}.empty{padding:32px 20px;text-align:center;color:var(--muted);line-height:1.8}.badge{display:inline-block;padding:4px 11px;border-radius:18px;background:#edf3ff;color:#3274df;font-size:11px;font-weight:600;white-space:nowrap}.badge.green{background:#eaf8f2;color:#21966b}.badge.orange{background:#fff4dc;color:#b37e15}.badge.red{background:#fff0f0;color:#d54e56}.badge.gray{background:#eef1f5;color:#738198}.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:20px;overflow-x:auto}.tabs a,.tabs button{padding:12px 20px;border:0;border-bottom:3px solid transparent;border-radius:0;background:transparent;white-space:nowrap;color:#7588a7;font-weight:650}.tabs .selected{border-color:var(--blue);color:var(--blue)}.segmented{display:inline-flex;gap:3px;padding:4px;background:#eef3f9;border-radius:8px}.segmented button{border:0;background:transparent;padding:9px 24px}.segmented .selected{background:var(--blue);color:white}.pagination{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:16px;font-size:12px;color:var(--muted)}.pagination .actions{gap:5px}.pagination button{padding:7px 12px}.pagination .current{background:var(--blue);color:white}.field{display:grid;gap:8px;margin-bottom:17px;min-width:0}.field>span,.field>label{font-weight:650;font-size:13px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px}.form-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}input,select,textarea{width:100%;min-width:0;background:white;border:1px solid #d7e0ef;border-radius:7px;padding:12px 14px;color:var(--ink)}textarea{min-height:110px;line-height:1.7;resize:vertical}input[type=checkbox],input[type=radio]{width:18px;height:18px;margin:0;accent-color:var(--blue);flex-shrink:0}label.check{display:flex;align-items:center;gap:9px;line-height:1.5}.checks{display:flex;gap:15px;flex-wrap:wrap}.student-card{display:flex;align-items:center;gap:18px}.student-card h2{margin:0 0 8px;font-size:22px}.definition{display:grid;grid-template-columns:110px minmax(0,1fr);gap:14px;margin:0}.definition dt{color:#7c8fac}.definition dd{margin:0;overflow-wrap:anywhere}.tree{display:grid;gap:7px}.tree details{padding:8px 4px}.tree summary{cursor:pointer;color:var(--ink);font-weight:650}.tree a{display:block;padding:10px 14px;border-radius:6px;margin:5px 0 0 18px;font-size:13px}.tree a.selected{background:#eaf2ff}.list{display:grid;gap:0}.list .item{border-bottom:1px solid #e9eef7;padding:15px 0;display:flex;justify-content:space-between;gap:12px;align-items:center}.list .item:last-child{border:0}.list .item b{display:block;margin-bottom:6px}.progress{height:7px;min-width:80px;background:#ebf1f8;border-radius:6px;overflow:hidden}.progress i{display:block;height:100%;background:#3989ff;border-radius:6px}.note{border-radius:8px;background:#f5f8fd;padding:15px;line-height:1.7;font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere}.subtle-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-bottom:20px}.subtle-stat{padding:17px;border:1px solid #e2eaf4;border-radius:10px;background:white}.subtle-stat b{display:block;font-size:22px;color:#1d6fe6;margin-top:8px}.subtle-stat small{color:var(--muted)}.side-actions{display:grid;gap:12px}.week-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));border:1px solid var(--line);border-radius:9px;overflow:hidden;min-width:650px}.week-day{min-height:210px;border-right:1px solid var(--line);background:white;padding:10px}.week-day:last-child{border:0}.week-day h3{text-align:center;font-size:12px;margin:0 0 12px;color:var(--muted)}.plan-chip{padding:10px;border-radius:7px;background:#edf5ff;font-size:12px;margin:9px 0;line-height:1.5}.plan-chip.done{background:#eaf8f1;color:#228c6a}.phone-preview{max-width:380px;min-height:430px;margin:0 auto;border:7px solid #34475e;border-radius:27px;background:#b6d1e5;padding:25px 18px}.phone-preview .bubble{background:white;border-radius:9px;padding:19px;font-size:13px;line-height:1.7;margin-top:18px}.phone-preview .bubble h3{font-size:15px;margin:0 0 13px}.phone-preview .bubble button{width:100%;margin-top:16px;background:#ffe745;border:0}.module-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.module-grid label{background:#f4f8ff;border:1px solid var(--line);padding:13px;border-radius:8px}.report-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.report-metrics .subtle-stat{background:#f5f9ff}.bars{height:180px;display:flex;align-items:flex-end;gap:14px;border-bottom:1px solid var(--line);padding:0 14px 22px;margin:24px 0}.bars .bar{flex:1;min-width:0;text-align:center;font-size:11px;color:var(--muted);position:relative}.bars .bar i{display:block;width:60%;margin:0 auto 8px;background:linear-gradient(#529dff,#237cf0);border-radius:4px 4px 0 0;min-height:2px;max-height:145px}.bars .bar b{display:block;color:var(--ink);margin-bottom:6px}.footer-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:22px;padding:16px 0;border-top:1px solid var(--line)}.footer-fixed{position:sticky;bottom:0;background:white;border:1px solid var(--line);border-radius:10px;padding:14px 18px;z-index:10;margin-top:22px}.footer-fixed .actions{justify-content:flex-end}.assignment{display:grid;grid-template-columns:minmax(0,1fr) 44px minmax(0,1fr);gap:15px}.assignment-arrows{display:flex;flex-direction:column;gap:12px;justify-content:center}.assignment-arrows button{padding:12px}.switch{position:relative;display:inline-flex;align-items:center;gap:10px;cursor:pointer}.switch input{appearance:none;width:42px;height:24px;border-radius:16px;background:#c7d1de;padding:0;border:0;position:relative}.switch input:before{content:'';position:absolute;left:3px;top:3px;width:18px;height:18px;background:white;border-radius:50%;transition:.15s}.switch input:checked{background:var(--blue)}.switch input:checked:before{transform:translateX(18px)}dialog{border:1px solid var(--line);border-radius:15px;padding:0;color:var(--ink);width:min(650px,calc(100vw - 32px));max-height:calc(100vh - 40px);box-shadow:0 24px 90px #10294d40}dialog::backdrop{background:#10294d55;backdrop-filter:blur(3px)}.dialog-body{padding:26px}.dialog-body h2{margin:0 0 20px}.dialog-close{float:right;border:0;padding:5px;background:transparent}.drawer-dialog{margin:12px 12px 12px auto;max-height:calc(100vh - 24px);height:calc(100vh - 24px);width:440px}.drawer-dialog .dialog-body{padding:25px}#toast{position:fixed;left:50%;bottom:25px;transform:translateX(-50%);z-index:100;background:#122b4e;color:white;border-radius:10px;padding:13px 20px;max-width:min(650px,90vw);display:none;box-shadow:0 6px 30px #0d234a30}#toast.visible{display:block}.initial-loading{padding:80px;text-align:center;color:var(--muted)}.login{max-width:460px;margin:10vh auto;padding:38px}.login .brand{justify-content:center;color:var(--ink);margin-bottom:22px}.login h1{font-size:24px;margin:22px 0}.login button{width:100%}.login .actions{margin-top:20px;justify-content:center}.error-state{text-align:center;padding:60px 25px}.mobile-menu{display:none}.page-status{min-height:24px;color:var(--muted);font-size:13px;margin-top:10px}.timeline{display:flex;gap:10px;justify-content:space-between;padding:20px 0}.timeline>div{flex:1;text-align:center;font-size:12px;border-top:3px solid #9dc6ff;padding-top:16px}.timeline b{display:block;color:#2679de;margin-bottom:8px}.print-only{display:none}.long-text{white-space:pre-wrap;overflow-wrap:anywhere}.tag-row{display:flex;gap:8px;flex-wrap:wrap}.table-wrap input[type=checkbox]{vertical-align:middle}@media(min-width:1600px){main{padding:28px 29px 38px}.panel{padding:23px}.nav a{padding:18px 20px}.topbar{padding:13px 29px}.page-head h1{font-size:29px}}@media(max-width:1250px){:root{--sidebar:220px}.nav a{font-size:14px;padding:14px}.columns.wide{grid-template-columns:190px minmax(0,1fr)}.columns.wide>.stack{grid-column:1/-1}.topbar .user small{display:none}.topbar-actions{gap:7px}.global-search{max-width:360px}.metric{padding:4px 10px}.metric .icon{display:none}.columns{grid-template-columns:minmax(0,1.5fr) minmax(270px,1fr)}.form-grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:1000px){.columns,.columns.equal{grid-template-columns:1fr}.stats{grid-template-columns:repeat(3,minmax(0,1fr));row-gap:17px}.stats .metric:nth-child(3){border:0}.form-grid{grid-template-columns:1fr}.topbar-actions .user{display:none}.module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.assignment{grid-template-columns:1fr}.assignment-arrows{flex-direction:row}.report-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:760px){:root{--sidebar:260px}.shell{display:block}.sidebar{transform:translateX(-100%);transition:.2s}.shell.menu-open .sidebar{transform:translateX(0);box-shadow:10px 0 40px #13264740}.mobile-menu{display:inline-flex;padding:9px}.topbar{height:67px;padding:10px 14px;gap:10px}.global-search{height:42px;max-width:none;padding:0 10px}.global-search kbd{display:none}.topbar-actions{margin:0}.topbar-actions>.primary{display:none}.topbar-actions>.danger{font-size:0;padding:10px}.topbar-actions>.danger .icon{width:18px;height:18px}.topbar .user{display:none}main{padding:20px 14px 30px}.page-head{align-items:flex-start;flex-direction:column;gap:13px}.page-head h1{font-size:24px}.page-head p{font-size:13px}.panel{padding:17px}.stats{grid-template-columns:repeat(2,minmax(0,1fr));padding:14px 6px}.metric{padding:7px 10px}.metric:nth-child(even){border:0}.metric b{font-size:20px}.columns.wide{grid-template-columns:1fr}.subtle-stats{grid-template-columns:1fr;gap:10px}.toolbar{gap:8px}.toolbar select{flex:1;min-width:120px}.toolbar input{width:100%;flex-basis:100%}.tabs a,.tabs button{padding:11px 14px}.module-grid{grid-template-columns:1fr}.form-grid.four{grid-template-columns:1fr}.student-card{gap:12px}.student-card h2{font-size:19px}.avatar.large{width:50px;height:50px}.drawer-dialog{margin:12px auto;width:calc(100vw - 24px)}.pagination{flex-wrap:wrap}.footer-fixed{position:static}.definition{grid-template-columns:95px minmax(0,1fr)}.login{margin:30px 14px}.initial-loading{padding:45px 20px}.bars{gap:5px;padding-left:0;padding-right:0}.phone-preview{width:100%}}@media print{.sidebar,.topbar,.tabs,.footer-actions,.footer-fixed,.page-head .actions,.no-print,#toast{display:none!important}.shell{display:block}.body{margin:0}.panel{break-inside:avoid;box-shadow:none}.columns{display:block}.columns>.stack{margin-top:20px}main{padding:0}.print-only{display:block}body{background:white}.phone-preview{display:none}}

/* Keep session controls visible while the navigation scrolls on short screens. */
.sidebar{min-height:0;overflow:hidden}
.brand,.sidebar-bottom{flex-shrink:0}
.nav{flex:1;min-height:0;overflow-y:auto;align-content:start}
.global-search{min-width:0}
.header-logout{display:inline-flex;align-items:center;justify-content:center;gap:7px;flex-shrink:0;min-height:42px;padding:10px 13px;color:var(--ink);background:#fff}
.header-logout svg{width:18px;height:18px}
.header-logout:disabled{opacity:.55;cursor:wait}
@media(max-width:760px){.topbar-actions{gap:7px;flex-shrink:0}.header-logout{padding:9px 10px;font-size:13px}.global-search input{width:100%}.global-search kbd{display:none}}