:root{
  --primary:#123B5D;--primary-strong:#0A2942;--secondary:#476273;--teal:#167C80;--accent:#B75028;
  --bg:#FFFFFF;--surface:#F6F3EC;--surface-cool:#EEF3F5;--text:#17242D;--text-2:#52636D;
  --border:#CFD9DD;--success:#247A52;--warning:#875800;--danger:#B42318;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
}
*{box-sizing:border-box}
html{font-size:17px}
@media (min-width:1600px){html{font-size:19px}}
@media (min-width:2200px){html{font-size:22px}}
body{margin:0;font-family:"Noto Sans KR","Apple SD Gothic Neo","Malgun Gothic",sans-serif;color:var(--text);background:var(--bg);line-height:1.65;letter-spacing:-.008em;word-break:keep-all}
a{color:var(--primary)}
button{font:inherit}
.wrap{max-width:1240px;margin:0 auto;padding:0 32px}
@media (max-width:640px){.wrap{padding:0 18px}}

/* top bar */
.topbar{background:var(--primary-strong);color:#fff;position:sticky;top:0;z-index:20}
.topbar .wrap{display:flex;align-items:center;gap:16px;min-height:56px;flex-wrap:wrap}
.brand{font-weight:700;letter-spacing:.02em;font-size:.95rem}
.draft{background:var(--accent);color:#fff;font-weight:700;font-size:.85rem;padding:4px 12px;border-radius:4px}
.date{font-family:var(--mono);font-size:.85rem;opacity:.85}
.topnav{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
.topnav a{color:#fff;text-decoration:none;padding:8px 12px;border-radius:4px;font-size:.9rem}
.topnav a:hover,.topnav a:focus-visible{background:rgba(255,255,255,.14);outline:none}

h1,h2,h3{margin:0;letter-spacing:-.025em;line-height:1.22}
h1{font-size:2.6rem;letter-spacing:-.035em}
h2{font-size:1.75rem}
h3{font-size:1.2rem;font-weight:600}
.label{font-size:.85rem;font-weight:700;letter-spacing:.04em;color:var(--secondary);text-transform:uppercase}
.muted{color:var(--text-2)}
section{padding:48px 0}
section+section{border-top:1px solid var(--border)}

/* overview header */
.hero{padding:48px 0 32px;background:var(--surface)}
.hero-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:start}
.hero p.sub{font-size:1.15rem;color:var(--text-2);margin:12px 0 0}
.facts{margin:0;display:grid;grid-template-columns:auto 1fr;gap:10px 20px;font-size:1rem}
.facts dt{font-weight:700;color:var(--primary);white-space:nowrap}
.facts dd{margin:0}
.structure{display:flex;gap:0;margin-top:28px;border:1px solid var(--border);border-radius:8px;overflow:hidden;background:#fff}
.structure>div{padding:14px 18px}
.structure .s-main{flex:9;background:var(--primary);color:#fff}
.structure .s-exam{flex:2.2;background:var(--teal);color:#fff}
.structure .s-sep{flex:3.2;background:#fff;border-left:2px dashed var(--border)}
.structure b{display:block;font-size:1.05rem}
.structure span{font-size:.88rem;opacity:.9}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr;gap:24px}.structure{flex-direction:column}.structure .s-sep{border-left:0;border-top:2px dashed var(--border)}}

.principles{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;padding:0;list-style:none}
.principles li{background:var(--surface-cool);color:var(--primary);border-radius:999px;padding:6px 14px;font-size:.92rem}
.principles li.key{background:var(--accent);color:#fff;font-weight:700}

/* timetable */
.days{display:grid;grid-template-columns:1fr 1fr;gap:32px}
@media (max-width:1000px){.days{grid-template-columns:1fr}}
.day-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;border-bottom:2px solid var(--primary);padding-bottom:10px;margin-bottom:4px}
.day-head .d{font-family:var(--mono);color:var(--accent);font-weight:600}
.day-head .t{flex-basis:100%;font-family:var(--mono);font-size:.88rem;color:var(--text-2)}
.slot{display:grid;grid-template-columns:7.2rem 1fr;gap:16px;padding:14px 10px;border-bottom:1px solid var(--border);text-decoration:none;color:inherit;border-radius:4px}
a.slot:hover,a.slot:focus-visible{background:var(--surface-cool);outline:none}
a.slot:focus-visible{box-shadow:0 0 0 3px var(--teal)}
.slot .time{font-family:var(--mono);font-size:.88rem;color:var(--text-2);padding-top:3px}
.slot .code{font-family:var(--mono);font-weight:600;color:var(--primary);margin-right:8px}
.slot .title{font-weight:700;font-size:1.05rem}
.slot .sum{font-size:.95rem;color:var(--text-2);margin-top:2px}
.slot .out{font-size:.9rem;margin-top:6px;color:var(--teal);font-weight:600}
.slot .go{float:right;color:var(--primary);font-size:.85rem;font-weight:600;opacity:.0;transition:opacity .15s}
a.slot:hover .go,a.slot:focus-visible .go{opacity:1}
.slot.brk{padding:6px 10px;color:var(--text-2);font-size:.9rem}
.slot.brk .title{font-weight:400;font-size:.9rem}
.slot.exam{background:var(--surface)}
.slot.exam .code{color:var(--teal)}

.side-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
@media (max-width:900px){.side-grid{grid-template-columns:1fr}}
.panel{border:1px solid var(--border);border-radius:8px;padding:24px;background:#fff}
.panel.muted-bg{background:var(--surface)}
.tool-table{width:100%;border-collapse:collapse;font-size:1rem;margin-top:12px}
.tool-table td{padding:8px 0;border-bottom:1px solid var(--border)}
.tool-table td:first-child{color:var(--text-2);width:7rem}
ul.plain{margin:12px 0 0;padding-left:1.2em}
ul.plain li{margin:4px 0}

/* exam summary on home */
.exam-strip{display:grid;grid-template-columns:repeat(4,auto) 1fr;gap:12px 40px;align-items:end;margin-top:20px}
.exam-strip .k{font-size:.85rem;color:var(--text-2)}
.exam-strip .v{font-size:1.5rem;font-weight:700;color:var(--primary);font-family:var(--mono)}
.exam-strip .v.acc{color:var(--accent)}
@media (max-width:900px){.exam-strip{grid-template-columns:repeat(2,1fr)}}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 18px;border-radius:4px;border:1px solid var(--primary);background:var(--primary);color:#fff;font-weight:600;cursor:pointer;text-decoration:none;font-size:.95rem}
.btn:hover{background:var(--primary-strong)}
.btn.sec{background:#fff;color:var(--primary)}
.btn.sec:hover{background:var(--surface-cool)}
.btn:focus-visible{outline:3px solid var(--teal);outline-offset:2px}
.btn[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:#fff}

/* soyang */
.soyang-list{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:20px;border-top:2px solid var(--secondary)}
.soyang-list a{padding:18px 16px;text-decoration:none;color:inherit;border-right:1px solid var(--border)}
.soyang-list a:last-child{border-right:0}
.soyang-list a:hover,.soyang-list a:focus-visible{background:var(--surface-cool);outline:none}
@media (max-width:800px){.soyang-list{grid-template-columns:1fr}.soyang-list a{border-right:0;border-bottom:1px solid var(--border)}}

/* checklist */
.checklist{counter-reset:c;list-style:none;padding:0;margin:20px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:0 40px}
.checklist li{counter-increment:c;display:grid;grid-template-columns:2.4rem 1fr;gap:8px;padding:14px 0;border-bottom:1px solid var(--border);font-size:1.02rem}
.checklist li::before{content:counter(c);font-family:var(--mono);font-weight:600;color:#fff;background:var(--primary);width:1.9rem;height:1.9rem;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.9rem}
@media (max-width:800px){.checklist{grid-template-columns:1fr}}

/* detail */
.detail-head{background:var(--surface);padding:32px 0 28px}
.crumb{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:18px}
.detail-head .meta{font-family:var(--mono);color:var(--text-2);margin-top:8px}
.detail-grid{display:grid;grid-template-columns:2fr 1fr;gap:40px;padding:36px 0}
@media (max-width:1000px){.detail-grid{grid-template-columns:1fr}}
.block{margin-bottom:36px}
.block>h2{font-size:1.3rem;margin-bottom:12px;color:var(--primary)}
.flow{width:100%;border-collapse:collapse}
.flow th{background:var(--primary);color:#fff;text-align:left;padding:10px 12px;font-weight:600;font-size:.92rem}
.flow td{padding:12px;border-bottom:1px solid var(--border);vertical-align:top}
.flow td.min{font-family:var(--mono);white-space:nowrap;color:var(--text-2);font-size:.92rem}
.stage{display:inline-block;font-size:.82rem;font-weight:700;padding:2px 10px;border-radius:999px;background:var(--surface-cool);color:var(--primary);white-space:nowrap}
.stage.s-시연{background:var(--primary);color:#fff}
.stage.s-응용{background:var(--teal);color:#fff}
.prompt{background:var(--surface-cool);border-radius:4px;padding:14px 16px;margin:10px 0;font-size:1rem;position:relative}
.prompt .copy{position:absolute;top:8px;right:8px;min-height:32px;padding:4px 10px;font-size:.8rem}
.prompt p{margin:0;padding-right:4.5rem}
.ment{margin:10px 0;padding:0 0 0 0;font-size:1.02rem}
.levels{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:700px){.levels{grid-template-columns:1fr}}
.levels>div{border:1px solid var(--border);border-radius:8px;padding:16px}
.levels h3{font-size:1rem;margin-bottom:6px}
.pit{width:100%;border-collapse:collapse}
.pit td{padding:12px;border-bottom:1px solid var(--border);vertical-align:top}
.pit td:first-child{font-weight:600;width:42%}
.pit th{text-align:left;padding:8px 12px;background:var(--surface-cool);font-size:.9rem;color:var(--primary)}
aside .panel{margin-bottom:20px}
.pager{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--border);padding:24px 0 48px;flex-wrap:wrap}

/* exam page */
.exam-controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:20px}
.seg{display:inline-flex;border:1px solid var(--primary);border-radius:4px;overflow:hidden}
.seg button{border:0;background:#fff;color:var(--primary);min-height:44px;padding:8px 16px;font-weight:600;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--primary);color:#fff}
.seg button:focus-visible{outline:3px solid var(--teal);outline-offset:-3px}
.ratio{width:100%;border-collapse:collapse;margin-top:12px}
.ratio th{background:var(--primary);color:#fff;padding:10px 12px;text-align:left;font-weight:600;font-size:.92rem}
.ratio th.n,.ratio td.n{text-align:right;font-family:var(--mono)}
.ratio td{padding:10px 12px;border-bottom:1px solid var(--border)}
.ratio tfoot td{font-weight:700;border-top:2px solid var(--primary)}
.bar{height:8px;background:var(--surface-cool);border-radius:2px;min-width:80px}
.bar i{display:block;height:100%;background:var(--teal);border-radius:2px}
.exam-sheet-head{display:flex;flex-wrap:wrap;gap:16px 32px;align-items:baseline;border:2px solid var(--primary);border-radius:8px;padding:18px 22px;margin:24px 0}
.exam-sheet-head .fill{border-bottom:1px solid var(--text);min-width:9rem;display:inline-block}
.q{padding:20px 0;border-bottom:1px solid var(--border);break-inside:avoid}
.q-top{display:flex;gap:12px;align-items:baseline;flex-wrap:wrap}
.q-num{font-family:var(--mono);font-weight:700;color:var(--primary);font-size:1.1rem;min-width:2.4rem}
.q-text{flex:1;font-size:1.05rem;font-weight:500;min-width:16rem}
.q-tags{display:flex;gap:6px}
.tag{font-size:.78rem;padding:2px 10px;border-radius:999px;background:var(--surface-cool);color:var(--primary);white-space:nowrap}
.tag.hard{background:var(--accent);color:#fff;font-weight:700}
.choices{list-style:none;padding:0;margin:12px 0 0 3.6rem;display:grid;grid-template-columns:1fr 1fr;gap:8px 24px}
@media (max-width:800px){.choices{grid-template-columns:1fr;margin-left:0}}
.choices li{display:grid;grid-template-columns:1.8rem 1fr;gap:4px;padding:6px 8px;border-radius:4px}
.choices li .n{font-weight:700;color:var(--secondary)}
.show-answers .choices li.correct{background:#E5F2EA;color:var(--success);font-weight:700}
.show-answers .choices li.correct .n{color:var(--success)}
.exp{display:none;margin:12px 0 0 3.6rem;background:var(--surface);padding:12px 16px;border-radius:4px;font-size:.98rem}
.show-answers .exp{display:block}
.hide-tags .q-tags{display:none}
.exp b{color:var(--success)}
@media (max-width:800px){.exp{margin-left:0}}
.notice{background:var(--surface-cool);padding:14px 18px;border-radius:4px;margin-top:16px;font-size:.98rem}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--primary-strong);color:#fff;padding:10px 20px;border-radius:4px;box-shadow:0 6px 20px rgba(0,0,0,.2);opacity:0;transition:opacity .2s;pointer-events:none;z-index:50}
.toast.on{opacity:1}

footer{background:var(--surface);padding:28px 0;font-size:.9rem;color:var(--text-2)}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* print */
@media print{
  @page{size:A4;margin:18mm 16mm}
  html{font-size:11.5pt}
  body{line-height:1.5}
  .topbar{position:static;background:none;color:var(--text);border-bottom:2px solid var(--primary)}
  .topnav,.no-print,.exam-controls,.prompt .copy,.slot .go,.pager{display:none!important}
  .draft{border:1px solid var(--accent);color:var(--accent);background:none}
  .hero,.detail-head{background:none}
  section{padding:18px 0}
  .days,.side-grid,.hero-grid,.detail-grid{grid-template-columns:1fr;gap:16px}
  .slot,.q,.checklist li,.flow tr,.pit tr{break-inside:avoid}
  h2,h3{break-after:avoid}
  a{text-decoration:none;color:inherit}
  .structure .s-main,.structure .s-exam,.flow th,.ratio th,.stage.s-시연,.stage.s-응용,.checklist li::before,.tag.hard{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .choices{grid-template-columns:1fr 1fr}
}