:root{color-scheme:light;--canvas:#f4f5f7;--surface:#ffffff;--surface-alt:#ffffff;--ink:#26313f;--body:#26313f;--muted:#647080;--line:#dce1e7;--bronze:#267f72;--bronze-soft:#267f72;--radius:10px;--navy:#202a38;font-family:Inter,"Noto Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;color:var(--body);background:var(--canvas);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;font-size:15px;line-height:1.65;word-break:keep-all}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.58}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #e8c5bf;outline-offset:4px}button,input,select,textarea{border-radius:8px}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--ink);line-height:1.45}svg{width:20px;height:20px;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}button svg{pointer-events:none}button{transition:background .16s,border-color .16s,color .16s}.sr-only{position:absolute!important;width:1px!important;height:1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important}.skip-link{position:fixed;left:16px;top:-100px;z-index:100;padding:12px 18px;background:var(--ink);color:#eceff2;border-radius:5px}.skip-link:focus{top:12px}.initial-loading{min-height:100vh;display:flex;flex-direction:column;gap:20px;align-items:center;justify-content:center;padding:30px;text-align:center;color:var(--muted)}.loading-mark{display:block;width:25px;height:25px;border:2px solid var(--line);border-top-color:var(--bronze);border-radius:50%;animation:student-spin .85s linear infinite}@keyframes student-spin{to{transform:rotate(360deg)}}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;padding:10px 17px;border:1px solid transparent;border-radius:7px;font-size:14px;font-weight:650;line-height:1.45;text-decoration:none;white-space:normal}.btn.primary{background:var(--ink);color:#eceff2;border-color:var(--ink)}.btn.primary:hover:not(:disabled){background:#25292d}.btn.secondary{background:var(--surface);color:var(--ink);border-color:#dce1e7}.btn.secondary:hover:not(:disabled){background:var(--surface-alt);border-color:var(--bronze)}.btn.quiet{background:transparent;color:var(--muted);border-color:transparent}.btn.quiet:hover:not(:disabled){background:var(--surface-alt);color:var(--ink)}.text-button{border:0;background:none;color:var(--bronze);padding:8px 0;min-height:40px;text-decoration:underline;text-underline-offset:4px;font-weight:650;font-size:14px;display:block}.eyebrow{font-size:12px;letter-spacing:1.7px;font-weight:750;color:var(--bronze);margin-bottom:12px}.helper,.muted{color:var(--muted);font-size:14px;line-height:1.75}.badge,.tag{display:inline-flex;align-items:center;padding:4px 9px;border-radius:4px;background:var(--surface-alt);color:#616d7a;font-size:12px;font-weight:650;line-height:1.5}.brand-symbol{display:grid;place-items:center;flex:none;width:38px;height:42px;background:var(--ink);color:#26313f;font:500 30px Georgia,serif;border-radius:3px}.student-brand,.login-brand{display:flex;align-items:center;gap:12px;text-align:left}.student-brand b,.login-brand b{font-size:19px;letter-spacing:-.5px;color:var(--ink);font-weight:800;display:block;line-height:1.4}.student-brand small,.login-brand small{display:block;font-size:9px;letter-spacing:1.6px;color:var(--muted);font-weight:650;line-height:1.8}
/* Login: a quiet editorial introduction alongside an uncluttered form. */
.student-login-shell{min-height:100dvh;display:grid;grid-template-columns:minmax(360px,.92fr) minmax(430px,1.08fr)}.login-intro{padding:48px clamp(35px,6.2vw,110px);background:var(--ink);color:#26313f;display:flex;flex-direction:column;position:relative;overflow:hidden}.login-brand b{color:#26313f}.login-brand small{color:#26313f}.login-brand .brand-symbol{background:#f0f4fa;color:var(--ink)}.login-editorial{margin:auto 0;padding:70px 0}.login-editorial .eyebrow{color:#287d71;letter-spacing:2px}.login-editorial h1{font-size:clamp(42px,4vw,62px);font-weight:600;line-height:1.35;letter-spacing:-2.5px;color:#26313f;margin-bottom:30px}.login-editorial>p:not(.eyebrow){font-size:17px;color:#26313f;line-height:1.95}.editorial-rule{height:1px;background:#f0f4fa;width:64px;margin:35px 0 22px}.login-caption{font-size:10px;letter-spacing:2px;color:#26313f}.login-footnote{font-size:12px;color:#26313f;line-height:1.8;margin-bottom:0}.login-panel{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:64px 36px;background:var(--canvas)}.login-card{width:100%;max-width:410px}.login-card h2{font-size:29px;letter-spacing:-1.2px;margin-bottom:14px;font-weight:750}.login-description{color:var(--muted);font-size:15px;line-height:1.85;margin-bottom:36px}.login-form{display:grid;gap:22px}.login-field label{display:block;margin-bottom:9px;font-weight:650;font-size:14px;color:var(--ink)}.login-field input{display:block;width:100%;min-height:54px;background:var(--surface);border:1px solid #dce1e7;color:var(--ink);padding:13px 16px;font-size:17px}.login-field input::placeholder{color:#616d7a;font-size:15px}.login-field input[type=password]{letter-spacing:5px;font-size:22px}.login-field input[type=password]::placeholder{letter-spacing:0}.pin-help{font-size:12px;color:var(--muted);margin:8px 0 0;line-height:1.7}.login-submit{width:100%;min-height:55px;margin-top:8px;justify-content:space-between;padding:15px 20px;font-size:16px}.login-assistance{font-size:14px;color:var(--muted);text-align:center;padding-top:23px;margin-bottom:0;line-height:1.8}.privacy-note{display:flex;gap:10px;align-items:flex-start;font-size:12px;color:var(--muted);max-width:410px;width:100%;margin:45px 0 0;border-top:1px solid var(--line);padding-top:24px;line-height:1.8}.privacy-note svg{width:17px;height:17px;margin-top:2px}.login-error{background:#ffffff;border:1px solid #dce1e7;border-radius:7px;padding:13px 16px;color:#aa4438;font-size:14px;margin:0 0 24px}
/* Assigned learning workspace. */
.student-header{height:88px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 36px;background:var(--surface);border-bottom:1px solid var(--line)}.student-brand{border:none;background:transparent;padding:0;flex-shrink:0}.student-user{display:flex;align-items:center;gap:22px;font-size:14px;color:var(--muted)}.student-user strong{color:var(--ink)}.logout-button{font-weight:500;font-size:13px}.student-layout{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:calc(100dvh - 138px)}.student-sidebar{background:var(--navy);color:#26313f;padding:39px 20px 30px;display:flex;flex-direction:column;min-width:0}.sidebar-label{color:#26313f;letter-spacing:2px;font-size:10px;margin:0 15px 18px}.student-nav{display:grid;gap:8px}.student-nav button{display:flex;align-items:center;gap:12px;min-height:52px;padding:12px 15px;text-align:left;border:1px solid transparent;border-radius:6px;background:transparent;color:#26313f;font-size:14px}.student-nav button:hover{background:#f0f4fa;color:#26313f}.student-nav button.active{background:#f0f4fa;color:#26313f;border-left:3px solid #dce1e7;padding-left:13px;font-weight:700}.student-nav svg{width:19px;height:19px;color:#26313f}.student-nav button.active svg{color:#287d71}.student-account{margin:72px 13px 0;padding-top:25px;border-top:1px solid #dce1e7}.account-initial{display:grid;place-items:center;width:35px;height:35px;border-radius:6px;background:#f0f4fa;font-size:15px;color:#26313f;margin-bottom:15px}.student-account strong{display:block;color:#26313f;font-size:15px;font-weight:650}.student-account p{font-size:12px;color:#26313f;margin:7px 0 17px}.student-account small{display:block;line-height:1.9;font-size:12px;color:#26313f}.teacher-link{display:block;margin-top:20px;font-size:12px;color:#287d71;text-underline-offset:4px}.student-main{width:100%;max-width:1280px;min-width:0;padding:42px clamp(26px,4vw,64px) 70px;margin:0 auto;outline:none}.page-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:30px}.page-heading .eyebrow{margin-bottom:8px;font-size:11px}.page-heading h1{font-size:29px;letter-spacing:-1px;font-weight:750;margin-bottom:10px}.page-heading>div>p:last-child{font-size:14px;color:var(--muted);line-height:1.85;margin-bottom:0}.page-heading>.btn{margin-top:28px;flex-shrink:0}.student-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:30px;overflow:hidden}.stat-card{padding:22px 25px;display:flex;align-items:center;justify-content:space-between;gap:12px}.stat-card+.stat-card{border-left:1px solid var(--line)}.stat-card>span{font-size:13px;color:var(--muted);font-weight:550}.stat-card strong{font-size:29px;font-weight:650;color:var(--ink);white-space:nowrap;line-height:1.3;font-variant-numeric:tabular-nums}.stat-card small{font-size:12px;font-weight:450;margin-left:7px;color:var(--muted)}.continue-panel{border:1px solid #dce1e7;border-radius:var(--radius);background:#ffffff;display:flex;align-items:center;justify-content:space-between;gap:25px;padding:24px 28px;margin-bottom:30px}.continue-panel h2{font-size:19px;margin-bottom:7px}.continue-panel .eyebrow{font-size:10px;margin-bottom:6px}.continue-panel p:last-child{font-size:13px;color:var(--muted);margin-bottom:0}.continue-list{display:grid;gap:8px;min-width:260px;max-width:55%}.continue-item{display:flex;align-items:center;justify-content:space-between;gap:15px;text-align:left;border:1px solid #dce1e7;background:var(--surface);padding:12px 15px;border-radius:6px;color:var(--ink)}.continue-item:hover{background:#ffffff;border-color:var(--bronze)}.continue-item b{display:block;font-size:13px}.continue-item small{display:block;font-size:12px;color:var(--muted);line-height:1.6;margin-top:2px}.continue-item svg{color:var(--bronze)}.assignment-tools{display:flex;gap:10px;margin:32px 0 18px;align-items:stretch}.assignment-tools select{height:46px;max-width:100%;padding:8px 34px 8px 13px;border:1px solid #dce1e7;background:var(--surface);color:var(--body);font-size:13px}.search-field{display:flex;align-items:center;gap:10px;flex:1;min-width:170px;position:relative}.search-field svg{position:absolute;left:14px;color:#616d7a;width:17px;height:17px;pointer-events:none}.search-field input{width:100%;height:46px;padding:10px 15px 10px 40px;background:var(--surface);border:1px solid #dce1e7;color:var(--ink);font-size:14px}.search-field input::placeholder{color:#616d7a}.results-count{font-size:12px;color:var(--muted);margin-bottom:15px}.scope-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.scope-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:25px 25px 22px;position:relative}.scope-card:hover{border-color:#dce1e7}.scope-kicker{display:flex;justify-content:space-between;gap:8px;align-items:center;margin-bottom:17px}.scope-level{font-size:12px;color:var(--muted)}.scope-title{font-size:19px;font-weight:750;letter-spacing:-.45px;margin-bottom:11px;overflow-wrap:anywhere;line-height:1.6}.scope-source{font-size:14px;line-height:1.8;color:var(--muted);margin-bottom:24px;overflow-wrap:anywhere}.scope-counts{display:flex;gap:18px;flex-wrap:wrap;margin:auto 0 22px;font-size:12px;color:var(--muted)}.scope-counts b{font-size:14px;color:var(--ink);margin-left:5px;font-weight:650}.scope-actions{display:flex;gap:8px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:18px}.scope-actions .btn{flex:1;min-width:120px;padding:10px 12px;font-size:13px;min-height:43px;white-space:nowrap}.scope-actions .btn svg{width:16px;height:16px}.scope-actions .helper{margin:0}.student-footer{display:flex;gap:20px;justify-content:space-between;padding:16px 34px;font-size:10px;color:#616d7a;border-top:1px solid var(--line);background:var(--surface);min-height:50px;letter-spacing:.2px}.empty-state{min-height:310px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:50px 30px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:0;margin:18px 0}.empty-state .loading-mark{margin-bottom:18px}.empty-icon{display:grid;place-items:center;width:48px;height:48px;border:1px solid #dce1e7;color:var(--bronze);border-radius:10px;margin-bottom:24px}.empty-icon svg{width:24px;height:24px}.empty-state h2{font-size:21px;letter-spacing:-.5px;margin-bottom:12px}.empty-state p{color:var(--muted);font-size:14px;line-height:1.9;margin-bottom:0}.empty-state .btn{margin-top:25px}.empty-state.compact{min-height:250px}.error-banner,.notice-banner{border:1px solid #dce1e7;border-left:3px solid #e8c5bf;border-radius:6px;background:#ffffff;color:#aa4438;padding:16px 19px;line-height:1.8;font-size:14px;margin-bottom:24px}.error-banner p{margin:8px 0}.error-banner .text-button{color:#aa4438}
/* Personal records and the fixed-context study module. */
.record-list{display:grid;gap:17px}.record-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:22px 26px}.record-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:13px}.record-status{font-size:12px;color:var(--muted);font-weight:600}.record-status.pending{color:var(--bronze)}.record-status.saved{color:#616d7a}.record-body{display:flex;justify-content:space-between;align-items:center;gap:20px}.record-body h2{font-size:18px;margin-bottom:9px;line-height:1.65}.record-summary{font-size:14px;margin-bottom:8px;color:var(--ink)}.record-meta{color:var(--muted);font-size:12px;margin:0}.record-body>.btn{flex-shrink:0;font-size:13px}.record-details{margin-top:20px;border-top:1px solid var(--line);padding-top:13px;font-size:14px}.record-details summary{cursor:pointer;color:#616d7a;font-size:13px;min-height:31px;padding:3px 0}.record-details[open] summary{margin-bottom:16px}.record-details ol{padding-left:20px;margin:0 0 20px}.record-details li{padding:14px 0 15px;border-top:1px solid var(--line);line-height:1.8}.record-details li:first-child{border-top:0}.record-details li>div{display:flex;justify-content:space-between;gap:15px}.record-details li p{margin:4px 0;word-break:break-word}.record-details li strong{font-size:16px;font-family:Georgia,"Times New Roman",serif}.answer-verdict{font-size:12px;color:var(--bronze);white-space:nowrap}.record-source{font:18px/1.8 Georgia,"Times New Roman",serif;color:var(--ink);white-space:pre-line;overflow-wrap:anywhere}.record-details>p{white-space:pre-line;overflow-wrap:anywhere}.record-feedback{padding:14px 16px;background:var(--surface-alt);border-radius:6px;font-size:14px;line-height:1.9}.student-study-header{display:flex;align-items:flex-start;gap:23px;margin-bottom:30px}.student-study-header>.btn{flex-shrink:0;margin-top:4px;font-size:13px}.student-study-header .eyebrow{font-size:12px;letter-spacing:.4px;display:block;margin-bottom:5px}.student-study-header h1{font-size:22px;line-height:1.6;letter-spacing:-.6px;margin:0}.student-shell .card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:25px}.student-shell .card h2{font-size:21px;margin-bottom:16px}.student-shell .card h3{font-size:17px}.student-shell .card>p{font-size:14px;line-height:1.85}.student-shell .field label{display:block;font-size:14px;margin-bottom:8px}.student-shell select,.student-shell input:not([type=checkbox]),.student-shell textarea{border:1px solid #dce1e7;color:var(--ink);background:var(--surface);padding:10px 12px}.student-shell .row-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}.student-shell .section-head{display:flex;align-items:center;justify-content:space-between;gap:15px}.student-shell .form-grid{display:grid;gap:16px;grid-template-columns:repeat(3,minmax(0,1fr))}.student-shell .notice{border:1px solid #dce1e7;background:#ffffff;padding:14px 18px;border-radius:7px;font-size:14px}.student-shell .cs-work{background:var(--surface)}.student-shell .cs-sticky{background:var(--surface)}.student-shell .cs-work textarea,.student-shell .cs-work input:not([type=checkbox]){background:#ffffff;font-size:17px}.student-shell .cs-tokens button{background:#ffffff}.student-shell .cs-tokens button.selected{background:var(--ink);color:#26313f}.student-shell .cs-answer-list summary span{font-size:12px;color:var(--bronze)}.student-shell .cs-start h2{font-size:23px}.student-shell .cs-options{font-size:14px}.student-shell .cs-picker h3{margin:0 0 8px}.student-shell .cs-progress{font-size:13px}
@media(min-width:1450px){.scope-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.scope-card{padding:23px 22px}.scope-actions{flex-direction:column}.student-layout{grid-template-columns:235px minmax(0,1fr)}}
@media(max-width:1100px){.student-header{padding:0 25px}.student-layout{grid-template-columns:190px minmax(0,1fr)}.student-sidebar{padding:30px 14px}.student-main{padding:35px 25px 60px}.stat-card{padding:19px 17px;align-items:flex-start;flex-direction:column;gap:8px}.scope-card{padding:22px 20px}.scope-actions .btn{min-width:100px}.scope-actions{flex-wrap:wrap}.page-heading h1{font-size:26px}.page-heading>.btn{font-size:12px;padding:9px 12px}.continue-panel{padding:21px}.continue-list{min-width:220px}.assignment-tools{flex-wrap:wrap}.search-field{flex-basis:100%}.assignment-tools>label:not(.search-field){flex:1}.assignment-tools select{width:100%}}
@media(max-width:800px){.student-login-shell{grid-template-columns:1fr}.login-intro{padding:27px 30px 30px;min-height:auto}.login-editorial{padding:35px 0 0}.login-editorial .eyebrow{margin-bottom:10px;font-size:11px}.login-editorial h1{font-size:34px;line-height:1.35;letter-spacing:-1.5px;margin-bottom:0}.login-editorial h1 br{display:none}.login-editorial>p:not(.eyebrow),.editorial-rule,.login-caption,.login-footnote{display:none}.login-panel{padding:38px 25px 36px}.login-card{max-width:430px}.login-card h2{font-size:25px}.login-description{margin-bottom:25px}.login-description br{display:none}.privacy-note{max-width:430px;margin-top:30px;padding-top:22px}.student-header{height:77px;padding:0 22px}.student-brand b{font-size:17px}.student-brand small{font-size:8px;letter-spacing:1px}.brand-symbol{width:32px;height:36px;font-size:26px}.student-user{gap:10px;font-size:13px}.logout-button{padding:7px 8px;font-size:12px}.student-layout{display:block;min-height:calc(100dvh - 130px)}.student-sidebar{display:block;padding:9px 20px;background:var(--ink)}.sidebar-label,.student-account{display:none}.student-nav{display:flex;gap:6px}.student-nav button{min-height:45px;padding:11px 17px;font-size:13px;flex:1;justify-content:center}.student-nav button.active{padding-left:17px;border-left:1px solid transparent;border-bottom:2px solid #dce1e7}.student-nav button svg{width:18px;height:18px}.student-main{padding:31px 25px 55px}.student-stats{margin-bottom:25px}.stat-card{padding:18px;flex-direction:row;align-items:center}.stat-card strong{font-size:26px}.stat-card>span{font-size:12px}.page-heading{margin-bottom:24px}.page-heading h1{font-size:25px}.page-heading>div>p:last-child{font-size:14px}.student-footer{font-size:10px;padding:15px 23px}.continue-list{max-width:55%}.student-shell .form-grid{grid-template-columns:1fr}}
@media(max-width:540px){.student-header{padding:0 17px;gap:9px;height:73px}.student-brand{gap:9px}.student-brand b{font-size:16px}.student-brand small{font-size:7px;letter-spacing:.7px}.student-user{gap:2px;align-items:flex-end;flex-direction:column;line-height:1.4;font-size:12px}.student-user .btn{min-height:28px;padding:4px 0}.student-sidebar{padding:8px 13px}.student-main{padding:27px 17px 45px}.page-heading{flex-direction:column;gap:14px}.page-heading h1{font-size:25px}.page-heading>.btn{margin-top:0;align-self:flex-start;min-height:38px}.page-heading>div>p:last-child{font-size:14px;line-height:1.85}.student-stats{margin-bottom:23px}.stat-card{padding:16px 12px;flex-direction:column;align-items:flex-start;gap:8px}.stat-card>span{font-size:11px}.stat-card strong{font-size:26px}.stat-card small{font-size:12px;margin-left:5px}.scope-grid{grid-template-columns:1fr;gap:16px}.scope-card{padding:23px 21px 21px}.scope-title{font-size:19px}.scope-source{font-size:13px}.scope-actions{flex-wrap:wrap}.scope-actions .btn{min-width:118px;min-height:46px;font-size:13px}.assignment-tools{margin-top:25px;gap:9px}.assignment-tools select{font-size:13px;min-height:44px}.search-field input{font-size:16px;min-height:48px}.search-field input::placeholder{font-size:14px}.continue-panel{display:block;padding:22px}.continue-panel h2{font-size:19px}.continue-list{max-width:none;min-width:0;margin-top:17px}.continue-item{padding:12px 14px;min-height:68px}.student-footer{padding:15px 18px;gap:8px;flex-wrap:wrap;font-size:10px}.empty-state{padding:40px 23px;min-height:285px}.empty-state h2{font-size:20px}.empty-state p{font-size:14px}.record-card{padding:20px}.record-body{align-items:flex-start;flex-direction:column;gap:16px}.record-body h2{font-size:18px}.record-body>.btn{min-height:40px;font-size:13px}.record-heading{align-items:flex-start}.record-status{font-size:12px;margin-top:5px}.record-details li>div{gap:8px}.record-details li p{font-size:14px}.student-study-header{flex-direction:column;gap:15px;margin-bottom:22px}.student-study-header>.btn{font-size:12px;min-height:38px;margin:0}.student-study-header h1{font-size:21px}.student-shell .card{padding:20px 17px}.student-shell .card h2{font-size:20px}.student-shell .cs-start h2{font-size:21px}.student-shell .cs-work textarea,.student-shell .cs-work input:not([type=checkbox]){font-size:16px}.student-shell .cs-options{gap:14px;font-size:14px}.student-shell .cs-options label{flex-wrap:wrap}.student-shell .cs-sentence{font-size:23px}.student-shell .cs-options input[type=number]{width:75px}.student-shell .row-actions>.btn{flex:1;min-width:110px}.student-shell .cs-sticky{padding-bottom:calc(12px + env(safe-area-inset-bottom))}.login-panel{padding:34px 22px}.login-intro{padding:25px 23px 28px}.login-editorial{padding-top:32px}.login-editorial h1{font-size:31px}.login-card h2{font-size:25px}.login-form{gap:19px}.pin-help{font-size:12px}.login-assistance{font-size:13px}.privacy-note{font-size:12px}}
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