:root{
  box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
  --paper:#F4F7FB;--panel:#FFFFFF;--grid:#DFE6EF;--line:#BCC9D8;--ink:#1E2A3A;--muted:#5D6B7D;
  --accent:#2F5BEA;--accent-ink:#fff;--warn:#B4441F;--ok:#1F7A4D;--off:#EEF2F7;
  --sat:68%;--light:87%;--tlight:24%;--bl:46%;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#131921;--panel:#1A222D;--grid:#243041;--line:#34455B;--ink:#E6ECF4;--muted:#9AA8BA;
  --accent:#7C9BFF;--accent-ink:#0E1420;--warn:#F08A63;--ok:#5CC98F;--off:#151C25;
  --sat:34%;--light:28%;--tlight:88%;--bl:62%;}}
:root[data-theme="dark"]{
  --paper:#131921;--panel:#1A222D;--grid:#243041;--line:#34455B;--ink:#E6ECF4;--muted:#9AA8BA;
  --accent:#7C9BFF;--accent-ink:#0E1420;--warn:#F08A63;--ok:#5CC98F;--off:#151C25;
  --sat:34%;--light:28%;--tlight:88%;--bl:62%;}
*,*::before,*::after{box-sizing:inherit}
html{height:100%;scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;min-height:100%;background:var(--paper);color:var(--ink);
  font-family:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;font-size:14px;line-height:1.55;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:24px 24px;background-attachment:fixed}
header{max-width:1500px;margin:0 auto;padding:28px 20px 16px}
h1{font-family:"Black Han Sans","IBM Plex Sans KR",sans-serif;font-weight:400;font-size:clamp(32px,5vw,52px);line-height:1.05;margin:0}
header p{margin:8px 0 0;color:var(--muted);max-width:70ch}
.grades{display:flex;gap:6px;flex-wrap:wrap;margin-top:14px}
.gt{padding:6px 15px;border-radius:16px;border:1px solid var(--line);background:var(--panel);cursor:pointer;font-weight:500;font:inherit;color:inherit}
.gt:hover{border-color:var(--ink)}
.gt[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink);font-weight:600}
main{max-width:1500px;margin:0 auto;padding:0 20px 48px;display:grid;grid-template-columns:370px minmax(0,1fr);gap:20px;align-items:start}
main>*{min-width:0;max-width:100%}
.box{background:var(--panel);border:1px solid var(--line);border-radius:6px}
aside{padding:2px 16px 12px}
aside section{padding:14px 0;border-bottom:1px dashed var(--line)}
aside section:last-child{border-bottom:0}
h2{font-size:15px;font-weight:600;margin:0 0 8px}
h3{font-size:14px;font-weight:600;margin:0 0 6px}
h4{font-size:13px;font-weight:600;margin:12px 0 6px}
.hint{font-size:12.5px;color:var(--muted);margin:-2px 0 8px}
input,select,button,textarea{font:inherit;color:inherit}
input[type=text],input[type=number],select,textarea{padding:5px 7px;border:1px solid var(--line);border-radius:4px;background:var(--paper);min-width:0;width:100%}
.btn{padding:7px 13px;border-radius:4px;border:1px solid var(--line);background:var(--paper);cursor:pointer;font-weight:500;white-space:nowrap}
.btn:hover{border-color:var(--ink)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn.sm{padding:4px 9px;font-size:13px}
.btn.reset{color:var(--warn);border-color:var(--warn)}
.btn.reset:hover{background:var(--warn);color:#fff;border-color:var(--warn)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
details.cfg>summary{cursor:pointer;font-weight:600;font-size:15px;list-style:none;display:flex;justify-content:space-between;align-items:center}
details.cfg>summary::-webkit-details-marker{display:none}
details.cfg>summary::after{content:"펼치기";font-size:12px;font-weight:500;color:var(--muted)}
details.cfg[open]>summary::after{content:"접기"}
.ncrow{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:13px}
.ncrow input{width:70px;text-align:center}
.chips{display:flex;flex-wrap:wrap;gap:5px}
.chip{display:inline-flex;align-items:center;gap:2px;padding:2px 3px 2px 10px;border-radius:14px;font-size:13px;
  background:hsl(var(--h) var(--sat) var(--light));color:hsl(var(--h) 60% var(--tlight))}
.chip button{border:0;background:transparent;cursor:pointer;color:inherit;font-size:15px;line-height:1;padding:2px 6px;border-radius:50%}
.chip button:hover{background:rgba(0,0,0,.08)}
.opts{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:13px}
.opts label{display:flex;align-items:center;gap:5px;white-space:nowrap;cursor:pointer}
.periods{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.periods label{font-size:12px;color:var(--muted);text-align:center;display:block}
.hours{display:grid;grid-template-columns:repeat(4,1fr);gap:6px 8px}
.hours label{font-size:12px;color:var(--muted);display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hours input{text-align:center}
.total{margin-top:8px;font-size:13px}
.total b.bad{color:var(--warn)} .total b.good{color:var(--ok)}
.paste-row{display:flex;gap:6px;margin-top:8px}
.paste-row textarea{height:34px;resize:none}
.tgrid{display:grid;grid-template-columns:22px repeat(5,1fr);gap:2px;margin-bottom:6px}
.tgrid .h{font-size:11px;color:var(--muted);text-align:center}
.tc{height:28px;border-radius:3px;border:1px solid var(--line);font-size:11px;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;background:var(--panel)}
.tc.a0{background:repeating-linear-gradient(45deg,var(--off) 0 3px,transparent 3px 6px);color:var(--muted)}
.tc.a1{background:hsl(var(--h) var(--sat) var(--light));color:hsl(var(--h) 60% var(--tlight));border-color:hsl(var(--h) 50% var(--bl))}
.tc.a2{border:1.5px dashed var(--warn);color:var(--warn)}
.tc.dup{outline:2px solid var(--warn);outline-offset:-2px;font-weight:600}
.tc.na{opacity:.35;cursor:default}
.tname{display:flex;align-items:center;gap:8px;margin:10px 0 4px}
.tname input{width:110px}
.legend{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:12px;height:12px;border-radius:2px;vertical-align:-2px;margin-right:3px;border:1px solid var(--line)}
.palette{display:flex;flex-wrap:wrap;gap:5px}
.pb{padding:4px 9px;border-radius:14px;border:1.5px solid transparent;cursor:pointer;font-size:13px;
  background:hsl(var(--h) var(--sat) var(--light));color:hsl(var(--h) 60% var(--tlight))}
.pb[aria-pressed="true"]{border-color:var(--ink);font-weight:600}
.pb.erase{background:var(--paper);color:var(--muted);border-color:var(--line)}
.pb.erase[aria-pressed="true"]{border-color:var(--ink);color:var(--ink)}
.brushbar{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--panel);border:1px solid var(--line);border-radius:5px;padding:10px 12px;margin-top:10px;display:grid;gap:8px;box-shadow:0 4px 10px -8px rgba(0,0,0,.35)}
.bb-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px}
.bb-title{font-size:14px;white-space:nowrap}
.bb-hint{font-size:12px;color:var(--muted)}
.custom{display:flex;flex-wrap:wrap;gap:6px;align-items:center;max-width:100%}
.custom input{width:140px}
.custom select{width:auto}
.check{display:flex;align-items:center;gap:6px;font-size:13px;white-space:nowrap}
.board{padding:14px}
.actions{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.actions .sep{flex:1}
.report{margin:10px 0 2px;font-size:13px;min-height:1.4em}
.report .err{color:var(--warn)} .report .ok{color:var(--ok)}
.classes{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:12px;margin-top:10px}
.cls{border:1px solid var(--line);border-radius:5px;padding:8px;background:var(--panel)}
.cls-h{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:4px}
.cls-h b{font-size:15px}
.cls-h span{font-size:12px}
.cls-h .bad{color:var(--warn)} .cls-h .good{color:var(--ok)}
table.tt{border-collapse:collapse;width:100%;table-layout:fixed}
.tt th{font-size:11px;font-weight:500;color:var(--muted);padding:2px 0}
.tt th.p{width:16px}
.tt td{height:30px;border:1px solid var(--grid);padding:1px;text-align:center;font-size:12px;cursor:pointer;user-select:none;position:relative}
.tt td.off{background:repeating-linear-gradient(45deg,var(--off) 0 3px,transparent 3px 6px);cursor:default}
.tt td .s{display:flex;align-items:center;justify-content:center;height:100%;border-radius:3px;
  background:hsl(var(--h) var(--sat) var(--light));color:hsl(var(--h) 60% var(--tlight));overflow:hidden;white-space:nowrap;font-size:12px;line-height:1.1}
.tt td .s.fx{font-weight:600;box-shadow:inset 0 0 0 1.5px hsl(var(--h) 50% var(--bl))}
.tt td .s.fx::after{content:"";position:absolute;top:3px;right:3px;width:5px;height:5px;border-radius:50%;background:hsl(var(--h) 55% var(--bl))}
.tt td .s.cu{background:var(--off);color:var(--muted)}
.tt td.bad .s{outline:2px solid var(--warn);outline-offset:-2px}
.tt td:not(.off):hover{background:var(--grid)}
.checks{margin-top:16px;display:grid;grid-template-columns:minmax(0,1fr);gap:14px}
.checks>*{min-width:0}
.scroll{overflow-x:auto;max-width:100%;min-width:0}
table.cnt{border-collapse:collapse;font-size:12.5px;min-width:640px;width:100%}
.cnt th,.cnt td{border:1px solid var(--grid);padding:4px 5px;text-align:center}
.cnt th{font-weight:500;color:var(--muted);background:var(--paper)}
.cnt td.bad{color:var(--warn);font-weight:600;background:color-mix(in srgb,var(--warn) 10%,transparent)}
.issues{margin:0;padding-left:18px}
.issues li.err{color:var(--warn)}
dialog{border:1px solid var(--line);border-radius:6px;background:var(--panel);color:var(--ink);max-width:min(640px,92vw);width:100%;padding:18px}
dialog::backdrop{background:rgba(10,15,25,.45)}
dialog textarea{height:200px;font-family:inherit;font-size:12px}
dialog .bar{display:flex;gap:6px;justify-content:flex-end;margin-top:10px}
.sync{display:inline-flex;align-items:center;gap:6px;margin-top:10px;font-size:12.5px;padding:3px 10px;border-radius:12px;border:1px solid var(--line);background:var(--panel);color:var(--muted)}
.sync::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--muted)}
.sync.ok{color:var(--ok)} .sync.ok::before{background:var(--ok)}
.sync.err{color:var(--warn)} .sync.err::before{background:var(--warn)}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:6px;font-size:14px;max-width:min(560px,90vw);z-index:20;transition:opacity .2s,transform .2s}
.toast.on{opacity:1;transform:translate(-50%,0)}
.toast.err{background:var(--warn);color:#fff}
@media (max-width:980px){main{grid-template-columns:minmax(0,1fr)}}
@media (max-width:480px){header{padding-inline:12px}main{padding-inline:12px}.board{padding:10px}.custom input{max-width:100%}.bb-hint{overflow-wrap:anywhere}}
@media print{body{background:#fff}aside,.actions,.report,.brushbar,.grades,.sync,header p{display:none}main{display:block}.box{border:0}}