:root{color-scheme:light;--ink:#21332d;--muted:#64736c;--accent:#17664c;--paper:#fff;--soft:#f5f8f6;--line:#dbe4df;--focus:#9fd0bc;font-family:system-ui,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:#fcfdfc;line-height:1.55}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.6}a{color:var(--accent)}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--focus);outline-offset:2px}.hidden{display:none!important}.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:17px max(20px,calc((100vw - 1000px)/2));border-bottom:1px solid var(--line);background:#fff}.brand{display:flex;align-items:center;gap:12px}.brand-box{background:var(--ink);color:white;font-weight:800;padding:11px;border-radius:10px;font-size:17px}.brand strong{font-size:19px;display:block;letter-spacing:-.5px}.brand small{font-size:12px;color:var(--muted);display:block}.pill{background:#e9f3ef;color:var(--accent);padding:8px 12px;font-size:12px;font-weight:700;border-radius:30px}.top-link{font-size:13px;text-decoration:none;font-weight:650}.container{max-width:1030px;margin:0 auto;padding:24px 20px 60px}h1{font-size:clamp(24px,3.5vw,34px);line-height:1.3;letter-spacing:-.8px;margin:5px 0 10px}h2{font-size:20px;margin:0 0 9px;letter-spacing:-.4px}h3{font-size:16px;margin:0 0 9px}p{margin:6px 0;color:var(--muted)}.muted{color:var(--muted)}.small{font-size:12px}.eyebrow{text-transform:none;font-size:12px;letter-spacing:.1px;color:var(--accent);font-weight:800}.hero{padding:12px 0 15px}.topic{background:var(--soft);border-left:4px solid var(--accent);padding:20px 24px;margin:16px 0 23px;border-radius:0 10px 10px 0}.topic h2{margin-top:7px;font-size:20px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:22px 0 13px;flex-wrap:wrap}.section-head h2{margin:0}.student-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.student-btn{border:1px solid var(--line);padding:13px 12px;background:white;border-radius:10px;text-align:left;min-height:70px}.student-btn:enabled:hover{border-color:var(--accent);background:#f1f8f5}.student-btn .num{display:block;font-size:12px;color:var(--muted)}.student-btn strong{display:block;font-size:16px;margin-top:3px}.student-btn.empty{color:#86978c;background:#f8faf9}.panel{border:1px solid var(--line);border-radius:13px;background:#fff;padding:22px;margin:18px 0}.discussion{margin-top:30px}.discussion ol{padding-left:26px}.discussion li{margin:14px 0;padding-left:6px}.discussion li::marker{font-weight:800;color:var(--accent)}.discussion li p{margin-top:3px}.discussion b{color:var(--accent)}.promise{background:var(--soft);border-radius:7px;padding:13px;font-weight:600;font-size:13px;margin-top:18px}.text-button{background:transparent;border:0;color:var(--accent);font-weight:750;padding:4px 0 15px}.actions{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0}.action-box{border:1px solid var(--line);border-radius:12px;background:#fff;padding:23px}.action-box h2{margin-top:16px}.action-box p{font-size:13px}.big-count{font-size:49px;font-weight:850;margin:8px 0;line-height:1.4}.big-count small{font-size:16px;margin-left:5px}.primary,.secondary{border:0;border-radius:9px;padding:12px 18px;font-weight:750}.primary{color:#fff;background:var(--accent)}.primary:hover:enabled{background:#0f503b}.secondary{background:#edf3ef;color:#225442;border:1px solid #d4e2da}.action-box button{width:100%;margin-top:20px;min-height:51px}.week-cells{display:grid;grid-template-columns:repeat(5,1fr);gap:9px;margin-top:16px}.week-cell{padding:13px 6px;border-radius:8px;background:var(--soft);text-align:center}.week-cell strong{font-size:19px;display:block}.week-cell span{display:block;font-size:11px;color:var(--muted)}.notice{padding:11px 15px;border:1px solid #bad9c9;background:#eef7f2;border-radius:9px;color:#155840;margin:5px 0 20px;font-size:13px}.notice.error{background:#fff0ef;border-color:#f5c6be;color:#a2352b}.notice button{float:right;background:none;border:0;color:inherit;font-weight:700}.admin-container{max-width:1150px}.login{max-width:420px;margin:50px auto}.login form,.topic-form{display:grid;gap:12px;margin:17px 0}.login label,.topic-form label{font-size:13px;font-weight:750;display:grid;gap:6px}input,select{border:1px solid #c9d7d0;padding:10px 11px;border-radius:8px;min-width:0;background:#fff;color:var(--ink)}.login input{width:100%}.admin-head{display:flex;align-items:center;justify-content:space-between;margin:12px 0 20px}.admin-tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:20px;flex-wrap:wrap}.admin-tabs button{border:0;background:transparent;padding:12px 17px;color:var(--muted);font-size:13px;font-weight:700;border-bottom:3px solid transparent}.admin-tabs button.selected{color:var(--accent);border-bottom-color:var(--accent)}.admin-section{padding:7px 0}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:9px;background:#fff}table{border-collapse:collapse;width:100%;font-size:13px;min-width:650px}td,th{text-align:left;border-bottom:1px solid var(--line);padding:11px 12px}tr:last-child td{border-bottom:0}th{background:#f3f6f4;color:#53645a;font-size:12px}td small{display:block;color:var(--muted);font-size:10px;margin-top:3px}td button{font-size:12px;padding:5px 9px}td input{width:145px;max-width:100%}.stats{display:flex;flex-wrap:wrap;gap:12px;margin:13px 0 19px}.stat{padding:13px 19px;background:var(--soft);border-radius:8px;flex:1;min-width:130px}.stat strong{font-size:25px;display:block}.stat span{font-size:12px;color:var(--muted)}.flex-end{display:flex;justify-content:flex-end;margin-top:12px}.topic-form{grid-template-columns:150px 1fr 150px;align-items:end}.topic-form label:nth-child(4){grid-column:1/span 3}.topic-form button{grid-column:1/span 3}.link-area{display:flex;gap:10px;margin:13px 0}.link-area input{flex:1}.warning-text{background:#fff7ed;border:1px solid #f2dfbf;padding:12px;border-radius:8px;color:#825b20;font-size:12px}.audit{font-size:12px;color:var(--muted);display:grid;gap:7px}.audit div{padding:9px 12px;background:var(--soft);border-radius:6px}footer{text-align:center;color:var(--muted);font-size:11px;padding:15px;border-top:1px solid var(--line)}@media(max-width:720px){.container{padding:20px 14px 45px}.top{padding:14px}.student-grid{grid-template-columns:repeat(3,1fr)}.actions{grid-template-columns:1fr}.topic-form{grid-template-columns:1fr}.topic-form label:nth-child(4),.topic-form button{grid-column:auto}.link-area{flex-direction:column}.section-head h2{font-size:18px}}@media(max-width:400px){.student-grid{grid-template-columns:repeat(2,1fr)}.brand strong{font-size:16px}.week-cells{gap:4px}.week-cell{padding:12px 3px}}


/* Step 5: consistent controls, icon geometry and tablet density */
:root{--ui-icon:20px;--ui-space:12px;--tablet-tap:48px}
.ui-icon{width:var(--ui-icon);height:var(--ui-icon);display:inline-block;flex:0 0 var(--ui-icon);vertical-align:-.23em}
button .ui-icon{width:18px;height:18px;flex:0 0 18px;vertical-align:middle}
button{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:var(--tablet-tap);line-height:1.35;text-align:center}
.text-button{display:inline-flex;align-items:center;gap:6px;min-height:40px}
.eyebrow{display:flex;align-items:center;gap:7px;line-height:1.4}
.eyebrow .ui-icon{width:17px;height:17px;flex-basis:17px}
.section-head h2,.discussion h2{display:flex;gap:9px;align-items:center}
.section-head .ui-icon,.discussion h2 .ui-icon{width:20px;height:20px;flex-basis:20px;color:var(--accent)}
.brand-box{width:47px;height:47px;display:grid;place-items:center;flex:0 0 47px;padding:0;line-height:1;border-radius:10px}
.student-btn{display:flex;flex-direction:column;align-items:flex-start;justify-content:center;min-height:78px;gap:3px}
.student-btn .num{line-height:1.3}
.student-btn strong{margin-top:0;line-height:1.35;word-break:keep-all}
.topic{padding:19px 21px}
.action-box{display:flex;flex-direction:column;min-width:0}
.action-box .primary,.action-box .secondary{margin-top:auto}
.big-count{font-variant-numeric:tabular-nums;font-size:48px;line-height:1.2}
.week-cell{min-width:0;display:grid;gap:4px;justify-items:center}
.week-cell strong{font-variant-numeric:tabular-nums}
.admin-tabs button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:48px;white-space:nowrap}
.admin-tabs button .ui-icon{color:currentColor;width:17px;height:17px;flex-basis:17px}
.stats .stat{min-height:92px}
.stat strong{font-variant-numeric:tabular-nums}
.topic-form input,.topic-form select{min-height:45px}
#summary-table td button{min-height:33px}
.qr-manager{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(275px,.75fr);gap:24px;align-items:start;margin:20px 0 22px}
.qr-config{min-width:0}
.field-label{display:block;font-weight:750;font-size:13px;margin:18px 0 7px}
.link-area{margin:5px 0 4px}
.link-area input{min-width:0}
.qr-url-input{width:100%;min-height:48px;font-size:13px}
.qr-toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:15px 0 10px}
.qr-toolbar>button{flex:1 1 160px}
.qr-status{line-height:1.7;font-size:12px;min-height:38px;word-break:keep-all}
.qr-result{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;text-align:center}
.qr-preview{width:min(100%,290px);margin:auto;aspect-ratio:1/1;border-radius:9px;display:grid;place-items:center;overflow:hidden;background:#f9faf9}
.qr-preview:empty:before{content:'QR 미리보기';font-size:13px;color:var(--muted)}
.qr-preview svg{width:100%;height:auto;aspect-ratio:1/1;display:block}
.qr-tools{display:flex;gap:9px;margin-top:16px}
.qr-tools button{flex:1;font-size:12px;padding:9px 6px;min-height:45px}
.qr-result>p{margin-top:10px}
@media(min-width:800px) and (max-width:1200px){.student-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.student-btn{min-height:84px}.actions{gap:15px}.action-box{padding:21px}}
@media(max-width:820px){.qr-manager{grid-template-columns:1fr;gap:16px}.qr-result{max-width:390px;width:100%;margin:auto}.admin-tabs{flex-wrap:nowrap;overflow-x:auto}.admin-tabs button{padding:12px 10px;flex:1 0 auto}.week-cells{gap:7px}}
@media(max-width:580px){:root{--ui-icon:18px;--tablet-tap:48px}.container{padding:16px 14px 36px}.top{padding:12px 14px}.brand-box{width:43px;height:43px;flex-basis:43px}.brand{gap:9px}.brand small{font-size:10px}.hero{padding:10px 0}.student-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.student-btn{padding:11px;min-height:78px}.student-btn strong{font-size:14px}.panel{padding:17px}.action-box{padding:18px}.topic{padding:17px 15px}.topic h2{font-size:18px}.week-cell strong{font-size:16px}.week-cell span{font-size:10px}.qr-result{padding:18px}.admin-head{gap:12px;flex-wrap:wrap}}
@media(max-width:360px){.student-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media print{body,html{background:#fff!important}body *{visibility:hidden!important}.qr-result,.qr-result *{visibility:visible!important}.qr-result{position:absolute;top:12mm;left:50%;transform:translateX(-50%);width:120mm;max-width:none!important;padding:10mm;border:0!important;break-inside:avoid}.qr-preview{width:95mm!important;max-width:none!important;aspect-ratio:1!important}.qr-preview svg{width:95mm;height:95mm}.qr-tools,.qr-result>p{display:none!important}}

/* Step 6: fast bulk roster entry, month-scoped editable discussion timetable */
.roster-table{min-width:0;max-width:650px}
.roster-table th:first-child,.roster-table td:first-child{width:85px}
.roster-table input{width:100%;max-width:360px;min-height:44px;font-size:15px}
.roster-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;position:sticky;bottom:0;background:#fff;border-top:1px solid var(--line);padding:14px 0;margin-top:14px;z-index:2}
.roster-footer button{min-width:195px}
.topic-month-toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:12px 0;margin-top:8px}
.topic-month-toolbar label{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:750}
.topic-month-toolbar input{min-height:46px}
.topic-month-toolbar .secondary{font-size:12px}
.link-area{flex-wrap:wrap}.link-area button{white-space:nowrap}
@media(max-width:600px){.roster-footer button{width:100%}.topic-month-toolbar input{width:160px}.topic-month-toolbar .secondary{min-height:46px}.link-area button{width:100%}}