/* Shared classroom shell; original learning views retain their controls. */
:root{--nav:#122c40;--nav2:#15394e;--bg:#f5f6f8;--ink:#172d40;--teal:#137d80;--line:#dce3e8;--gold:#b59b58}body{font-size:17px!important;line-height:1.75!important}a,button{touch-action:manipulation}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #b99436;outline-offset:4px}a.btn{text-decoration:none;display:inline-flex;align-items:center;justify-content:center}button:disabled{cursor:not-allowed;opacity:.55}[hidden]{display:none!important}.layout{grid-template-columns:240px minmax(0,1fr)}.side{padding:25px 18px}.side>.eyebrow{display:none}.brand{display:block;text-decoration:none;color:white!important;margin-bottom:24px}.brand img{display:block;width:150px;height:110px;object-fit:contain;background:white;border-radius:10px;margin:0 0 20px}.brand strong{font-size:22px;letter-spacing:-.6px;line-height:1.35;display:block}.brand span{font-size:13px;letter-spacing:0;display:block;margin-top:8px;color:#bad0dd}.side>p{font-size:13px!important;margin:0 0 24px}.nav{font-size:16px;margin:6px 0;padding:13px 15px;text-decoration:none}.side .meter{margin-top:35px}.side .meter p{font-size:13px;line-height:2.3}.main{max-width:1360px;padding:35px clamp(22px,4vw,64px) 60px}.top{margin-bottom:32px}.top h2{font-size:24px}.top p{font-size:14px}.top .eyebrow{font-size:12px;letter-spacing:.3px}.classroom-hero{display:grid;grid-template-columns:1.25fr 1fr;gap:35px;align-items:center;padding:42px;background:#122f44;border-radius:18px}.classroom-hero .eyebrow{color:#d4bd81;font-size:12px}.classroom-hero h3{font-size:clamp(31px,3vw,46px);letter-spacing:-1.7px;line-height:1.35}.classroom-hero h3 em{color:#e1c888}.classroom-hero p{font-size:16px;line-height:1.9}.classroom-hero .primary{background:#e4cb8e;color:#172d40}.classroom-hero .secondary{background:#294859;color:#fff}.table-illustration{padding:24px;background:#fff;color:#17344a;border-radius:13px;box-shadow:0 16px 30px #04182426}.table-label{font-size:13px;color:#667786;font-weight:700;margin-bottom:15px}.table-illustration table{border-collapse:collapse;width:100%;font:15px/1.8 Consolas,monospace}.table-illustration th,.table-illustration td{text-align:left;padding:9px 10px;border-bottom:1px solid #e5eaee}.table-illustration thead th{color:#70808d;font-size:13px}.table-illustration tbody th{background:#fcf4df;color:#8e742e}.table-illustration p{display:flex;justify-content:space-between;color:#17344a;margin:18px 0 8px}.table-illustration small{font-size:11px;color:#6b7d8c;line-height:1.5;display:block}.lesson-intro{margin:37px 0 21px}.lesson-intro h3{font-size:23px;margin:5px 0}.lesson-intro p{font-size:15px;color:#637483;margin:7px 0}.course-map{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;margin-bottom:30px}.course-card{display:flex;gap:18px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:21px;text-decoration:none;color:#172d40;align-items:flex-start;transition:border-color .15s,transform .15s}.course-card:hover{border-color:#167b7f;transform:translateY(-2px)}.course-card.first{border-color:#c3aa64;background:#fffdf8}.course-number{font-size:22px;font-weight:750;color:#98a5b0;min-width:32px;line-height:1.5}.course-card.first .course-number{color:#a08847}.course-card strong{display:block;font-size:17px}.course-card p{font-size:13px!important;color:#627687;line-height:1.7!important;margin:7px 0 10px}.course-card small{font-size:12px;color:#137d80;font-weight:750}.course-card .subtle{color:#826f42}.supplemental{padding:25px}.supplemental p{font-size:14px;color:#65788a}.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.resource-grid a,.resource-grid button{border:1px solid #dce5eb;border-radius:9px;background:#f7f9fb;text-decoration:none;color:#25475b;text-align:left;font-family:inherit;font-size:15px;font-weight:600;line-height:1.6;padding:17px;cursor:pointer}.resource-grid span{display:block;font-size:12px;color:#6c7e8c;margin-top:6px}.archive{font-size:14px;background:transparent;box-shadow:none;border-style:dashed}.archive summary{cursor:pointer;font-weight:700}.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:18px;padding:15px 24px;background:#fff;border-bottom:1px solid #dce3e8;font:600 14px/1.6 system-ui;color:#597184}.breadcrumb a{color:#186370;text-decoration:none}.teacher-wrap{max-width:1120px;margin:0 auto;padding:30px 24px 70px}.teacher-hero{background:#122f44;color:white;padding:36px;border-radius:16px;margin:18px 0 25px}.teacher-hero h1{font-size:32px;margin:4px 0}.teacher-hero p{color:#d1dce3}.teacher-wrap h2{font-size:25px;margin-top:30px}.teacher-wrap .panel{background:#fff;padding:25px;border:1px solid #dae3e8;border-radius:12px;margin:18px 0}.teacher-wrap table{border-collapse:collapse;width:100%;font-size:15px}.teacher-wrap th,.teacher-wrap td{border:1px solid #dce3e8;padding:12px;text-align:left;vertical-align:top}.teacher-wrap th{background:#eef2f5}.teacher-wrap pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.7 Consolas,monospace;background:#122c40;color:#e5f0f8;padding:18px;border-radius:9px}.teacher-wrap details{margin:14px 0;border-top:1px solid #dae3e8;padding-top:14px}.teacher-wrap summary{cursor:pointer;font-weight:700}.teacher-wrap .actions{display:flex;gap:12px;flex-wrap:wrap}.teacher-wrap a{color:#126b77}.teacher-wrap .primary{color:white}.teacher-wrap .muted{color:#627687;font-size:14px}.teacher-wrap .table-wrap{overflow:auto}.teach-steps{display:grid;grid-template-columns:1fr 1fr;gap:16px}.teacher-wrap select{font:inherit;padding:10px;max-width:100%}.teacher-wrap .callout{padding:20px;background:#fff5dc;border-left:4px solid #c2a35a;border-radius:9px}.concept-list{padding-left:23px}.concept-list li{margin:11px 0;font-size:16px}.expected-output{background:#f1f5f8;color:#223f53;border:1px solid #dce6ed;white-space:pre-wrap;padding:17px;font:14px/1.6 Consolas,monospace;border-radius:8px}.quiz-result{font-weight:650;color:#146765}.quiz-option{display:block;margin:8px 0}.sidebar .brand img{width:120px;height:90px}.sidebar .brand strong{font-size:20px}.sidebar .brand{margin:0 8px 20px}.sidebar .lesson-nav{font-size:14px;padding:12px}.lesson-downloads{display:flex;gap:9px;flex-wrap:wrap}.lesson-downloads a{text-decoration:none}.page .panel h3{line-height:1.45}.editor{font-size:16px!important;line-height:1.75!important}.output{font-size:15px!important;line-height:1.7!important;max-height:540px;overflow:auto}.step-dot{font-size:14px!important}.teacher-wrap .brand-mini{width:110px;height:80px;object-fit:contain;background:white;border-radius:8px;float:right}.note{font-size:14px!important}summary{cursor:pointer}
@media(min-width:1450px){.main{max-width:1450px}.classroom-hero{padding:50px}.course-card{padding:24px}}
@media(max-width:1000px){.classroom-hero{grid-template-columns:1fr;padding:28px}.table-illustration{max-width:500px}.resource-grid{grid-template-columns:1fr}.main{padding:24px}.course-map{grid-template-columns:1fr}}
@media(max-width:850px){.layout{display:block}.side,.sidebar{position:static;height:auto}.side{padding:15px 18px}.side>.brand{display:flex;gap:17px;align-items:center;margin:0 0 13px}.brand img{width:70px;height:52px;margin:0}.brand strong{font-size:18px}.brand span{font-size:11px;margin-top:3px}.side>p,.side .meter,.side .side-foot{display:none}.side nav{display:flex;flex-wrap:wrap;gap:5px}.side .nav{font-size:13px;width:auto;margin:0;padding:9px 10px}.top{margin-bottom:20px}.top .badge{margin-top:10px}.classroom-hero h3{font-size:32px}.course-card{padding:18px}.teacher-wrap{padding:18px 13px}.teacher-hero{padding:24px}.teacher-hero h1{font-size:26px}.teach-steps{grid-template-columns:1fr}.table-wrap{overflow-x:auto}.sidebar .brand img{width:70px;height:52px}.sidebar .brand{display:flex;align-items:center;gap:15px}.teacher-wrap .panel{padding:18px}.breadcrumb{font-size:13px;padding:13px}.main{padding:22px 14px}.table-illustration{padding:18px}.classroom-hero{gap:22px}}
@media print{.side,.sidebar,.breadcrumb,.actions,button,.archive{display:none!important}.layout{display:block}.teacher-wrap{padding:0}.panel,section{break-inside:avoid}details>*{display:block!important}body{background:white!important;color:black!important}.teacher-hero{background:white!important;color:black!important;border:1px solid #aaa}.teacher-hero p{color:black}.teacher-wrap pre{color:black;background:#f5f5f5}}

/* One classroom shell for all five student menus. */
.classroom-page{font-family:system-ui,"Noto Sans KR","Malgun Gothic",sans-serif;background:#f5f6f8;color:#172d40}
.classroom-page .layout{display:grid;grid-template-columns:240px minmax(0,1fr);min-height:100vh}
.classroom-page .side{position:sticky;top:0;height:100vh;overflow:auto;padding:25px 18px;background:#122c40;color:#eefbff}
.classroom-page .side .brand{display:block;margin:0 0 24px;text-align:center}
.classroom-page .side .brand img{display:block;width:180px;max-width:100%;height:auto;aspect-ratio:2048/1529;object-fit:contain;background:#fff;border-radius:10px;margin:0 auto 20px}
.classroom-page .side .brand strong{font-size:22px;letter-spacing:-.6px;line-height:1.35;display:block}
.classroom-page .side .brand span{font-size:13px;letter-spacing:0;display:block;margin-top:8px;color:#bad0dd}
.classroom-page .side>p{font-size:13px!important;line-height:1.75;color:#b2cfda;margin:0 0 24px}
.classroom-page .side .nav{display:block;box-sizing:border-box;width:100%;border:0;border-radius:10px;background:transparent;color:#d1e5eb;text-align:left;font:400 16px/1.75 system-ui,"Noto Sans KR","Malgun Gothic",sans-serif;margin:6px 0;padding:13px 15px;text-decoration:none;cursor:pointer}
.classroom-page .side .nav:hover,.classroom-page .side .nav.active{background:#2d5665;color:#fff}
.classroom-page .side .meter{margin:35px 8px 20px;border-top:1px solid #3c5867;padding-top:16px;font-size:13px}
.classroom-page .side .meter p{font-size:13px;line-height:2.3;color:#b2cfda;margin:6px 9px 25px}
.classroom-page .side-foot{margin:22px 8px;color:#a8c8d3;font-size:12px;line-height:1.75}
.classroom-page .main{min-width:0;width:100%;max-width:1360px;margin:auto;padding:35px clamp(22px,4vw,64px) 60px}
.classroom-page .top{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:32px}
.classroom-page .top .eyebrow{font-size:12px;letter-spacing:.3px;font-weight:850;color:#137d80}
.classroom-page .top h2{font-size:24px;line-height:1.3;margin:6px 0}
.classroom-page .top p{font-size:14px;line-height:1.75;margin:0;color:#647b8c}
.classroom-page .top .badge{display:inline-block;border-radius:25px;padding:8px 12px;background:#deedf3;color:#176373;font-weight:800;font-size:12px;line-height:1.75;white-space:nowrap}
.classroom-page .practice-hero{background:#122f44;border-radius:18px;padding:42px;margin-bottom:18px;color:#fff}
.classroom-page .practice-hero .eyebrow{color:#d4bd81;font-size:12px;letter-spacing:.3px}
.classroom-page .practice-hero h3{font-size:clamp(25px,3vw,34px);line-height:1.35;margin:14px 0}
.classroom-page .practice-hero p{font-size:16px;line-height:1.9;color:#e1f5f4;margin:8px 0}
.classroom-page .lesson-picker{padding:14px 20px;margin-bottom:18px}
.classroom-page .lesson-picker summary{font-size:15px;color:#25475b;font-weight:700}
.classroom-page .lesson-picker .lesson-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:14px}
.classroom-page .lesson-picker .lesson-nav{font-family:inherit;font-size:14px;font-weight:400;line-height:1.5;display:block;width:100%;margin:0;padding:12px;text-align:left;border:1px solid #dce3e8;border-radius:9px;background:#f5f7f9;color:#25475b;cursor:pointer}
.classroom-page .lesson-picker .lesson-nav small{display:block;font-size:12px;color:#627687}
.classroom-page .lesson-picker .lesson-nav.active{background:#2d5665;color:#fff;border-color:#2d5665}
.classroom-page .lesson-picker .lesson-nav.active small{color:#d1e5eb}
.classroom-page .lesson-picker .lesson-nav:hover{border-color:#137d80}
.classroom-page .skip{position:absolute;top:-100px}.classroom-page .skip:focus{top:8px;left:8px;z-index:8;background:white;padding:8px}
@media(min-width:1450px){.classroom-page .main{max-width:1450px}.classroom-page .practice-hero{padding:50px}}
@media(max-width:1000px){.classroom-page .main{padding:24px}.classroom-page .practice-hero{padding:28px}}
@media(max-width:850px){
 .classroom-page .layout{display:block}.classroom-page .side{position:static;height:auto;padding:18px}
 .classroom-page .side .brand{display:block;text-align:center;margin:0 0 18px}.classroom-page .side .brand img{width:140px;height:auto;margin:0 auto 12px}
 .classroom-page .side .brand strong{font-size:20px}.classroom-page .side .brand span{font-size:12px}
 .classroom-page .side>p,.classroom-page .side .meter,.classroom-page .side-foot{display:none}
 .classroom-page .side nav{display:flex;justify-content:center;flex-wrap:wrap;gap:5px}
 .classroom-page .side .nav{width:auto;margin:0;padding:9px 10px;font-size:13px}
 .classroom-page .main{padding:22px 14px 60px}.classroom-page .top{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px}.classroom-page .top .badge{margin:0}
 .classroom-page .practice-hero{padding:24px}.classroom-page .practice-hero h3{font-size:25px}
 .classroom-page .lesson-picker .lesson-list{grid-template-columns:1fr}
}
@media print{.classroom-page .side,.classroom-page .lesson-picker{display:none!important}.classroom-page .layout{display:block}}

/* Creator identity directly beneath the logo, shared by student pages. */
.classroom-page .side .brand{padding-bottom:22px;margin-bottom:18px;border-bottom:1px solid #ffffff24}
.classroom-page .side .brand img{margin-bottom:8px}
.classroom-page .side .brand .classroom-name{color:#e8cd8b;font-size:18px;font-weight:800;line-height:1.5;letter-spacing:-.65px;white-space:nowrap}
.classroom-page .side .brand .classroom-unit{color:#f2f7fa;font-size:18px;font-weight:700;line-height:1.5;letter-spacing:-.4px;margin-top:18px}
.classroom-page .side .brand .classroom-subject{color:#b6cbd6;font-size:12px;font-weight:400;line-height:1.6;margin-top:5px}
@media(max-width:850px){
 .classroom-page .side .brand{padding-bottom:18px;margin-bottom:14px}
 .classroom-page .side .brand .classroom-name{font-size:18px}
 .classroom-page .side .brand .classroom-unit{font-size:16px;margin-top:12px}
}