html, body { margin: 0; }
/* 레이아웃: 왼쪽에서 설정을 만지고, 오른쪽 무대에서 개념이 움직이는 것을 보고, 아래에서 실행끼리 비교한다. */
:root {
  --bg: #f5f2ea; --surface: #fcfaf5; --ink: #1c1a17; --muted: #6b665c; --line: #dcd5c6;
  --busy: #f8dd86; --busy-edge: #a97800; --idle: #ebe6da; --queue: #d5e3f5; --queue-edge: #2b62a8;
  --done: #dfe8d2; --done-edge: #46702f; --rej: #f8d6cc; --rej-edge: #b03a26; --accent: #1c1a17;
  --term: #1c56a8; --code-bg: #f9f6ee; --kw: #7a3e9d; --num: #a14a00; --type: #1f5fa8; --cm: #7d776b; --str: #0b6b3a;
  --font-body: "IBM Plex Sans KR", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  --font-head: "Noto Serif KR", "Nanum Myeongjo", "AppleMyungjo", Batang, serif;
  --font-code: "JetBrains Mono", "D2Coding", Consolas, "Courier New", monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { background: var(--bg); color: var(--ink); font-family: var(--font-body); font-size: 15px; line-height: 1.65; word-break: keep-all; overflow-wrap: break-word; -webkit-font-smoothing: antialiased; }
.wrap { max-width: 1160px; margin: 0 auto; padding-inline: 24px; padding-block: 22px 72px; display: flex; flex-direction: column; gap: 28px; }
h1 { font-family: var(--font-head); font-size: 1.6rem; line-height: 1.25; margin: 0; font-weight: 700; }
h2 { font-family: var(--font-head); font-size: 1.3rem; line-height: 1.35; margin: 0; font-weight: 700; text-wrap: balance; }
h3 { font-size: .8rem; margin: 0; font-weight: 600; letter-spacing: .04em; color: var(--muted); }
p { margin: 0; }
button, input, select { font: inherit; color: inherit; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-code); }

.top { display: flex; flex-direction: column; gap: 10px; border-bottom: 1px solid var(--line); padding-bottom: 14px; }
.top p { max-width: 110ch; color: var(--muted); }
.cats { display: flex; flex-direction: column; gap: 6px; }
.catrow { display: flex; flex-wrap: wrap; gap: 6px 8px; align-items: center; }
.catname { font-size: .78rem; font-weight: 600; color: var(--muted); min-width: 5.5em; }
.cat { border: 1px solid var(--line); background: var(--surface); padding: 5px 13px; border-radius: 3px; font-size: .88rem; cursor: pointer; }
.cat:hover, .cat:focus-visible { border-color: var(--accent); outline: none; }
.cat[aria-current="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); font-weight: 600; }
.navbox { display: flex; flex-direction: column; gap: 12px; }
.navhead { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.tracks { display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); gap: 8px; }
.track { text-align: left; border: 1px solid var(--line); background: var(--surface); border-radius: 3px; padding: 8px 12px; cursor: pointer; display: flex; flex-direction: column; gap: 1px; }
.track b { font-size: .94rem; }
.track span { font-size: .78rem; color: var(--muted); }
.track:hover, .track:focus-visible { border-color: var(--accent); outline: none; }
.track[aria-current="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.track[aria-current="true"] span { color: inherit; opacity: .75; }
.trackpanel { background: var(--surface); border: 1px solid var(--line); border-radius: 3px; padding: 14px 16px; display: flex; flex-direction: column; gap: 8px; }
.trackpanel p { color: var(--ink); }
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.stagehead { font-size: .78rem; font-weight: 600; color: var(--accent); letter-spacing: .04em; margin-top: 8px; }
.step { display: grid; grid-template-columns: 2em minmax(0, 1fr) auto; gap: 10px; align-items: start; text-align: left; width: 100%; border: 1px solid transparent; background: transparent; border-radius: 4px; padding: 6px 8px; cursor: pointer; }
.step:hover, .step:focus-visible { background: color-mix(in srgb, var(--ink) 5%, transparent); outline: none; }
.step[aria-current="true"] { background: color-mix(in srgb, var(--ink) 7%, transparent); }
.step .num { font-family: var(--font-code); font-size: .8rem; color: var(--muted); padding-top: 2px; }
.step .nm { font-weight: 600; }
.step .nt { display: block; font-size: .84rem; color: var(--muted); font-weight: 400; }
.step .seen { font-size: .74rem; color: var(--muted); white-space: nowrap; padding-top: 3px; }
.pathbar { display: flex; flex-wrap: wrap; gap: 8px 10px; align-items: center; font-size: .86rem; }
.pathbar .where { color: var(--muted); }
.linkbtn { border: 0; background: transparent; padding: 0; color: var(--accent); cursor: pointer; text-decoration: underline; font-size: inherit; }

.lesson-head { display: flex; flex-direction: column; gap: 8px; }
.eyebrow { font-size: .8rem; font-weight: 600; color: var(--accent); letter-spacing: .04em; }
.lesson-head p { max-width: 72ch; }
/* 실습 머리: 목차에서 고른 항목의 이름이 제목이고, 그 실습이 답하려는 물음이 그 아래에 온다 */
.lesson-head h2 { font-size: 1.9rem; letter-spacing: -.01em; }
.lesson-head .question { font-size: 1.12rem; font-weight: 600; line-height: 1.45; margin: 0; text-wrap: balance; }
.titlerow { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }

/* 머리의 두 칸: 왼쪽은 이 실습에 나오는 개념의 정의, 오른쪽은 이 실습에서 보는 것 */
.headcols { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 14px 44px; align-items: start; margin-top: 8px; padding-top: 14px; border-top: 1px solid var(--line); }
.concept, .about { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.about { padding-left: 44px; margin-left: -22px; border-left: 1px solid var(--line); }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; }
.seg button { border: 0; background: transparent; padding: 4px 12px; cursor: pointer; font-size: .86rem; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); font-weight: 600; }
.terms { columns: 2; column-gap: 30px; }
.term { break-inside: avoid; margin-bottom: 14px; }
.term b { display: block; }
.term .no { font-family: var(--font-code); font-size: .74rem; color: var(--muted); font-weight: 400; }
.term p { font-size: .92rem; max-width: 70ch; }

/* 위에서부터: 설정 → 실행 띠(스크롤해도 따라옴) → 왼쪽 그림과 오른쪽 실행표 → 전체 단계 기록 → 실행 비교 → 코드 → 예시("이렇게 바꿔 보세요").
   그림이 없는 실습은 그림 자리에 코드가 온다. 한 번의 실험(설정 → 실행 → 관찰 → 비교)이 한 화면 안에서 이어지게 한다. */
.grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); grid-template-areas: "ctl ctl" "bar bar" "code stage"; gap: 16px 22px; align-items: start; }
.p-ctl { grid-area: ctl; } .p-stage { grid-area: stage; } .p-code { grid-area: code; } .p-pic { grid-area: pic; } .p-bar { grid-area: bar; }
.grid:not(.haspic) .p-pic { display: none; }
.grid.haspic { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); grid-template-areas: "ctl ctl" "bar bar" "pic stage"; }
/* 물음 방식(기초개념 실습): 설정 칸 대신 차례로 눌러 볼 물음을 두고, 그 옆에 코드를 둔다. 물음을 누르면 처음 코드에서 달라진 곳이 코드에 표시된다. */
.grid.qgrid { grid-template-areas: "ctl code" "bar bar" "stage stage"; }
/* 그림이 있으면 세 칸으로 나눈다: 윗줄은 물음과 코드(75칸짜리 줄이 넘치지 않는 너비), 아랫줄은 그림과 결과. 윗줄과 아랫줄이 나뉘는 자리가 다르다. */
.grid.qgrid.haspic { grid-template-columns: minmax(0, .96fr) minmax(0, .2fr) minmax(0, 1fr); grid-template-areas: "ctl code code" "bar bar bar" "pic pic stage"; }
/* 기초개념이 아닌 실습과 영어판의 기초개념 실습(qwide)은 코드 줄이 길다(영어는 주석이 길어진다). 물음을 두 단으로 위에 두고, 코드는 그 아래에 전체 너비로 둔다. */
.grid.qgrid.qwide { grid-template-areas: "ctl ctl" "code code" "bar bar" "stage stage"; }
.grid.qgrid.qwide.haspic { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); grid-template-areas: "ctl ctl" "code code" "bar bar" "pic stage"; }
.grid.qgrid.qwide .asks { display: block; column-count: 2; column-gap: 22px; }
.grid.qgrid.qwide .asks li { break-inside: avoid; margin-bottom: 2px; }
.asks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.askq { display: grid; grid-template-columns: 1.5em minmax(0, 1fr); gap: 8px; align-items: baseline; width: 100%; text-align: left; border: 1px solid transparent; background: transparent; border-radius: 3px; padding: 7px 9px; cursor: pointer; font-size: .96rem; }
.askq:hover, .askq:focus-visible { background: color-mix(in srgb, var(--ink) 5%, transparent); outline: none; }
.askq .num { color: var(--muted); font-family: var(--font-code); font-size: .84rem; }
.askq[aria-current="true"] { border-color: var(--ink); background: var(--bg); font-weight: 600; }
.p-ctl.qmode .ctlsum { display: none; }
.p-ctl.qmode #ctl-toggle { display: inline-block; align-self: flex-start; }
.p-ctl.qmode.shut .ctls { display: none; }
.code .ln { display: block; }
.code .ln.add, .code mark { background: color-mix(in srgb, var(--busy) 50%, transparent); color: inherit; }
.grid.qgrid .p-code .code { max-height: 380px; overflow-y: auto; }
.code .ln.del, .code s { text-decoration: line-through; opacity: .5; }
.below { display: flex; flex-direction: column; gap: 16px; }
.ctls { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px 20px; align-items: start; }
.presets { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 6px; }
.grid.haspic .p-pic, .grid:not(.haspic) .p-code { position: sticky; top: calc(var(--barh, 104px) + 10px); max-height: calc(100vh - var(--barh, 104px) - 20px); overflow-y: auto; }
/* 실행 띠: 전체 단계 기록. 조작 줄 아래에 지나온 단계가 쌓이고, 맨 아래 줄이 지금 단계다 */
.panel.p-bar { position: sticky; top: 0; z-index: 20; padding: 10px 18px 12px; gap: 8px; border-color: var(--ink); box-shadow: 0 3px 0 color-mix(in srgb, var(--ink) 14%, transparent); }
.p-bar .runrow { gap: 6px 8px; }
.p-bar .btn { padding: 4px 12px; font-size: .9rem; }
.p-bar .clock { font-family: var(--font-code); font-size: .84rem; color: var(--muted); margin-left: 4px; }
.p-bar .clock b { color: var(--accent); }
.p-bar .stale { font-size: .86rem; font-weight: 600; color: var(--busy-edge); margin-left: auto; }
.p-bar.isstale #run { box-shadow: 0 0 0 3px color-mix(in srgb, var(--busy-edge) 45%, transparent); }
.p-bar .log { max-height: 170px; font-size: .92rem; }
.p-bar .log li:last-child .tx { font-weight: 600; }
.ask { border: 1px dashed var(--queue-edge); background: var(--bg); padding: 10px 12px; border-radius: 3px; display: flex; flex-direction: column; gap: 8px; }
.askopts { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 6px 18px; }
.askopts .check { font-weight: 400; align-items: baseline; }
.p-bar.asking .log { display: none; }
.p-bar .predtoggle { margin-left: auto; font-weight: 400; font-size: .88rem; }
.p-bar .stale:not([hidden]) ~ .predtoggle { margin-left: 0; }
.vsprev ul { margin: 2px 0 0; padding-left: 1.2em; } .vsprev li.pok { color: var(--done-edge); } .vsprev li.pno { color: var(--rej-edge); font-weight: 600; }
.ctlsum { display: none; font-size: .88rem; color: var(--muted); }
.fold { align-self: flex-start; }
.p-hist { gap: 10px; }
.ctl.chg, .check.chg { outline: 2px solid var(--busy-edge); outline-offset: 4px; border-radius: 3px; }
.chgtag { font-size: .72rem; font-weight: 600; color: var(--busy-edge); margin-left: 6px; }
.preset[aria-pressed="true"] { border-color: var(--ink); background: var(--surface); box-shadow: inset 0 -2px 0 var(--ink); }
.vsprev { font-size: .88rem; border-top: 1px solid var(--line); margin-top: 8px; padding-top: 8px; display: flex; flex-direction: column; gap: 2px; }
.vsprev .mono { font-size: .82rem; }
.assume { font-size: .85rem; color: var(--muted); }
/* 검증 수준: 이 모형이 무엇과 대조해 확인됐는지 */
.vbadge { font-size: .8rem; color: var(--muted); }
.vbadge .linkbtn { color: inherit; text-decoration-style: dotted; text-underline-offset: 3px; }
.vsum { font-size: .84rem; color: var(--muted); }
.cat .vd { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 6px; background: var(--muted); vertical-align: 1px; }
.cat .vd.run { background: var(--done-edge); } .cat .vd.part { background: var(--queue-edge); } .cat .vd.model { background: transparent; border: 1px solid var(--muted); }
/* 처음 화면과 분야 목록 */
.brand { font-family: var(--font-head); font-size: 1.2rem; font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.brand:hover, .brand:focus-visible { color: var(--accent); outline: none; }
#pre { display: none; }
.langsw { font-size: .88rem; color: var(--muted); text-underline-offset: 3px; }
.toplinks { display: flex; gap: 14px; align-items: center; }
.notice { max-width: 70ch; padding: 8px 12px; border: 1px solid var(--line); border-radius: 3px; }
.home, .catview { display: flex; flex-direction: column; gap: 44px; }
.catview { gap: 16px; }
.catview > h2, .quiz h2 { font-size: 1.9rem; letter-spacing: -.01em; }
.hero { display: flex; flex-direction: column; gap: 14px; padding-block: 22px 0; }
.hero h1 { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.startbox { border-top: 1px solid var(--line); padding-top: 18px; display: flex; flex-direction: column; gap: 12px; }
.lead { font-size: 1.05rem; max-width: 64ch; }
.hero .lead { font-family: var(--font-head); font-weight: 600; font-size: clamp(1.4rem, 2.7vw, 2.05rem); line-height: 1.42; letter-spacing: -.012em; max-width: 27em; text-wrap: balance; }
.hero .muted { max-width: 70ch; }
.hsec { display: flex; flex-direction: column; gap: 12px; border-top: 2px solid var(--ink); padding-top: 18px; }
.hsec h2 { font-size: 1.55rem; }
.hsec h3 { margin-top: 8px; }
.hsec.about p { max-width: 76ch; }
.hgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 0 32px; }
.hgrid.small { grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); }
.hcard { text-align: left; border: 0; border-top: 1px solid var(--line); background: transparent; border-radius: 0; padding: 14px 4px 18px; cursor: pointer; display: flex; flex-direction: column; gap: 5px; }
.hgrid.small .hcard { padding: 11px 4px 14px; }
.hcard b { font-family: var(--font-head); font-size: 1.28rem; line-height: 1.35; }
.hcard .m::after { content: "\2192"; font-weight: 400; margin-left: .5em; opacity: 0; transition: opacity .15s, margin-left .15s; }
.hcard:hover .m::after, .hcard:focus-visible .m::after { opacity: 1; margin-left: .8em; }
.hgrid.small .hcard b { font-size: 1.04rem; }
.hcard .d { font-size: .9rem; color: var(--muted); }
.hcard .m { font-size: .8rem; color: var(--muted); font-weight: 500; margin-top: 2px; }
.hcard:hover, .hcard:focus-visible { background: color-mix(in srgb, var(--ink) 4%, transparent); outline: none; }
.hcard.test b { font-size: 1.12rem; }
.crumbs, .eyebrow { display: flex; flex-wrap: wrap; gap: 4px 6px; align-items: baseline; font-size: .86rem; }
.crumbs .sep, .eyebrow .sep { color: var(--muted); }
.crumbs .here { font-weight: 600; }
.cgroup { border-top: 1px solid var(--line); padding: 16px 0 4px; display: flex; flex-direction: column; gap: 6px; }
.cgroup h3 { font-family: var(--font-head); font-size: 1.08rem; font-weight: 700; color: var(--ink); letter-spacing: 0; }
.step.todo { cursor: default; color: var(--muted); }
.step.todo:hover { border-color: transparent; }
.step.todo .nm { font-weight: 500; }
.step .seen.todo { color: var(--muted); border: 1px dashed var(--line); border-radius: 2px; padding: 0 8px; }
.site-foot { border-top: 1px solid var(--line); padding-top: 14px; font-size: .84rem; color: var(--muted); }
.toprow { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; justify-content: space-between; }
.picwrap { overflow-x: auto; }
#pic { display: block; width: 100%; min-width: 520px; height: auto; font-family: var(--font-body); }
#pic text { font-size: 12.5px; fill: var(--ink); }
#pic .ttl { font-weight: 600; font-size: 13px; }
#pic .mono { font-family: var(--font-code); font-size: 12px; }
#pic .pr rect { fill: none; stroke: var(--muted); stroke-width: 1; stroke-dasharray: 5 4; }
#pic .pr text { fill: var(--muted); font-weight: 600; }
#pic .pb rect { fill: var(--idle); stroke: var(--line); stroke-width: 1; }
#pic .pb.hot rect { fill: var(--busy); stroke: var(--busy-edge); }
#pic .pb.wait rect { fill: var(--queue); stroke: var(--queue-edge); }
#pic .pb.good rect { fill: var(--done); stroke: var(--done-edge); }
#pic .pb.bad rect { fill: var(--rej); stroke: var(--rej-edge); }
#pic .pb.plain rect { fill: var(--surface); stroke: var(--muted); }
#pic .pb.ghost rect { fill: none; stroke: var(--muted); stroke-dasharray: 4 3; }
#pic .pb.ghost text, #pic .pt.mut { fill: var(--muted); }
#pic .pb.now rect { stroke: var(--ink); stroke-width: 2; }
#pic .pt.bad { fill: var(--rej-edge); font-weight: 600; } #pic .pt.good { fill: var(--done-edge); font-weight: 600; }
#pic .pa path { fill: none; stroke: var(--ink); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
#pic .pa.hot path { stroke: var(--busy-edge); stroke-width: 2; } #pic .pa.bad path { stroke: var(--rej-edge); } #pic .pa.good path { stroke: var(--done-edge); } #pic .pa.mut path { stroke: var(--muted); }
#pic .pa.dash path.ln { stroke-dasharray: 5 4; }
#pic .pa text { font-size: 11.5px; fill: var(--muted); }
.now.running { border-left-color: var(--accent); }
.now .clock b { color: var(--accent); }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 3px; padding: 16px 18px; display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.ctl { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; align-items: center; }
.ctl label { font-size: .9rem; font-weight: 500; }
.ctl output { font-family: var(--font-code); font-size: .85rem; font-variant-numeric: tabular-nums; }
.ctl input[type=range], .ctl select { grid-column: 1 / -1; width: 100%; }
.ctl input[type=range] { accent-color: var(--accent); }
.ctl .hint { grid-column: 1 / -1; font-size: .8rem; color: var(--muted); }
.check { display: flex; align-items: center; gap: 8px; font-size: .9rem; font-weight: 500; }
.preset { text-align: left; border: 1px solid var(--line); background: var(--bg); border-radius: 3px; padding: 7px 10px; cursor: pointer; font-size: .88rem; }
.preset:hover, .preset:focus-visible { border-color: var(--accent); outline: none; }
.preset b { display: block; }
.preset span { color: var(--muted); font-size: .82rem; }
.runrow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.btn { border: 1px solid var(--ink); background: var(--ink); color: var(--bg); border-radius: 3px; padding: 7px 16px; cursor: pointer; font-weight: 600; transition: background-color .12s, border-color .12s; }
.btn:hover { background: color-mix(in srgb, var(--ink) 80%, var(--bg)); border-color: color-mix(in srgb, var(--ink) 80%, var(--bg)); }
.btn.ghost { background: transparent; color: var(--ink); font-weight: 500; }
.btn.ghost:hover { background: color-mix(in srgb, var(--ink) 8%, transparent); border-color: var(--ink); }
.btn.small { padding: 4px 10px; font-size: .86rem; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
select { border: 1px solid var(--line); background: var(--surface); border-radius: 3px; padding: 6px 8px; }

.code { margin: 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: 4px; padding: 10px 12px; font-family: var(--font-code); font-size: .76rem; line-height: 1.6; overflow-x: auto; white-space: pre; tab-size: 4; }
.k { color: var(--kw); } .n { color: var(--num); font-weight: 600; } .t { color: var(--type); } .c { color: var(--cm); } .s { color: var(--str); }

.stage { display: flex; flex-direction: column; gap: 14px; }
.now { border-top: 1px solid var(--line); padding: 8px 2px 0; min-height: 3.4em; }
.now .clock { font-family: var(--font-code); font-size: .8rem; color: var(--muted); }
.now .say { font-weight: 600; }
.steprow { display: flex; flex-wrap: wrap; gap: 8px; }
.view { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.counters { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 8px; }
.counter { border: 1px solid var(--line); border-radius: 4px; padding: 6px 10px; }
.counter { min-width: 0; }
.counter .v { font-family: var(--font-code); font-size: 1.15rem; font-weight: 600; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.counter .l { font-size: .78rem; color: var(--muted); }
.lanes { display: flex; flex-direction: column; gap: 6px; }
.lane { display: grid; grid-template-columns: 5.6em minmax(0, 1fr); gap: 8px; align-items: center; font-size: .85rem; }
.lane .name { font-family: var(--font-code); font-size: .78rem; overflow-wrap: anywhere; }
.bar { position: relative; min-height: 28px; border-radius: 4px; background: var(--idle); border: 1px solid var(--line); overflow: hidden; }
.bar .fill { position: absolute; inset: 0 auto 0 0; background: var(--busy); border-right: 2px solid var(--busy-edge); }
.bar .txt { position: relative; display: flex; align-items: center; min-height: 26px; padding: 2px 8px; font-size: .8rem; }
.lane.none .bar { border-style: dashed; background: transparent; }
.lane.none .txt { color: var(--muted); }
.lane.hot .bar { background: var(--busy); border-color: var(--busy-edge); }
.lane.wait .bar { background: var(--queue); border-color: var(--queue-edge); }
.lane.bad .bar { background: var(--rej); border-color: var(--rej-edge); }
.lane.good .bar { background: var(--done); border-color: var(--done-edge); }
.slots { display: flex; flex-wrap: wrap; gap: 6px; min-height: 30px; align-items: center; }
.slot { min-width: 44px; min-height: 28px; border-radius: 4px; border: 1px dashed var(--line); display: flex; align-items: center; justify-content: center; font-family: var(--font-code); font-size: .78rem; color: var(--muted); padding: 2px 7px; }
.slot.q { background: var(--queue); border: 1px solid var(--queue-edge); color: var(--ink); }
.slot.r { background: var(--rej); border: 1px solid var(--rej-edge); color: var(--ink); }
.slot.d { background: var(--done); border: 1px solid var(--done-edge); color: var(--ink); }
.slot.b { background: var(--busy); border: 1px solid var(--busy-edge); color: var(--ink); }
.slot.now { outline: 2px solid var(--ink); outline-offset: 1px; }
.slots.mini { gap: 4px; }
.slots.mini .slot { min-width: 30px; min-height: 26px; padding: 0 3px; }
.log { margin: 0; padding: 0; list-style: none; max-height: 340px; overflow: auto; border: 1px solid var(--line); border-radius: 4px; font-size: .86rem; }
.log li { display: grid; grid-template-columns: 4.6em minmax(0, 1fr); gap: 8px; padding: 5px 10px; border-bottom: 1px solid var(--line); }
.log li:last-child { border-bottom: 0; }
.log .tm { font-family: var(--font-code); font-size: .78rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.log li.bad .tx { color: var(--rej-edge); font-weight: 600; }
.log li.good .tx { color: var(--done-edge); font-weight: 600; }
.verdict { background: var(--bg); border-radius: 4px; padding: 10px 12px; }
.verdict:empty { display: none; }
.verdict ul { margin: 6px 0 0; padding-left: 1.2em; }

.tablewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 3px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .86rem; }
table.hist { min-width: 640px; }
th, td { padding: 6px 10px; border-bottom: 1px solid var(--line); text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
th { font-weight: 600; color: var(--muted); font-size: .78rem; }
th:first-child, td:first-child, th.l, td.l { text-align: left; }
tr:last-child td { border-bottom: 0; }
tr.latest td { font-weight: 600; }
table.data td, table.data th { text-align: left; font-family: var(--font-code); font-size: .78rem; }
table.data td.hot { background: var(--busy); }
table.data td.bad { background: var(--rej); }
table.data td.good { background: var(--done); }
table.data tr.gone td { text-decoration: line-through; color: var(--muted); }
.note { font-size: .85rem; color: var(--muted); max-width: 78ch; }
.cap { font-size: .8rem; color: var(--muted); }

/* 용어 풀이: 파란 낱말을 누르면 뜻이 뜬다 */
.gl { color: var(--term); border-bottom: 1px dotted currentColor; cursor: pointer; border-radius: 2px; }
.gl:hover, .gl:focus-visible { background: color-mix(in srgb, var(--term) 16%, transparent); border-bottom-style: solid; outline: none; }
.glpop { position: absolute; z-index: 50; width: min(400px, calc(100vw - 24px)); background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-top: 3px solid var(--term); border-radius: 0 0 3px 3px; box-shadow: 4px 4px 0 color-mix(in srgb, var(--ink) 16%, transparent); padding: 12px 14px; display: flex; flex-direction: column; gap: 8px; font-size: .92rem; font-weight: 400; }
.glpop .glhead { display: flex; gap: 10px; align-items: baseline; justify-content: space-between; }
.glpop .glhead b { font-size: 1rem; }
.glpop .glfoot { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; }
.glpop .no { font-family: var(--font-code); font-size: .74rem; color: var(--muted); }

/* 개념 테스트 */
.tabs { align-self: flex-start; }
.tabs { border: 0; border-radius: 0; overflow: visible; gap: 26px; }
.tabs button { padding: 4px 1px; font-size: .98rem; border-bottom: 2px solid transparent; color: var(--muted); }
.tabs button:hover { color: var(--ink); }
.tabs button[aria-pressed="true"] { background: transparent; color: var(--ink); border-bottom-color: var(--ink); font-weight: 700; }
.wrap:not(.v-lab) .labonly { display: none !important; }
.wrap:not(.v-quiz) #quizview { display: none; }
.wrap:not(.v-home):not(.v-study):not(.v-quizpick) #homeview { display: none; }
.wrap:not(.v-cat) #catview { display: none; }
.quiz { display: flex; flex-direction: column; gap: 16px; }
.quiz .qlead { max-width: 72ch; }
.lvgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px; }
.lvgrid .track { padding: 12px 14px; gap: 4px; }
.lvgrid .track b { font-size: 1.05rem; }
.lvgrid .track span { font-size: .84rem; }
.lvgrid .track .best { font-family: var(--font-code); font-size: .76rem; }
.qmeta { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline; font-size: .88rem; }
.qmeta .cnt { font-family: var(--font-code); font-weight: 600; }
.qmeta .linkbtn { margin-left: auto; }
.qbar { height: 4px; background: var(--idle); border-radius: 2px; overflow: hidden; }
.qbar div { height: 100%; background: var(--accent); }
.qcard { gap: 16px; max-width: 860px; }
.qtext { font-family: var(--font-head); font-weight: 600; font-size: 1.2rem; line-height: 1.5; text-wrap: pretty; }
.qbody { padding: 10px 14px; background: var(--bg); border-radius: 3px; max-width: 72ch; }
.opts { display: flex; flex-direction: column; gap: 8px; }
.opt { display: grid; grid-template-columns: 1.6em minmax(0, 1fr) auto; gap: 8px; align-items: start; text-align: left; border: 1px solid var(--line); background: var(--surface); border-radius: 3px; padding: 10px 12px; cursor: pointer; }
.opt .num { font-family: var(--font-code); font-size: .82rem; color: var(--muted); padding-top: 1px; }
.opt .mark { font-size: .76rem; font-weight: 600; white-space: nowrap; padding-top: 2px; }
.opt:hover, .opt:focus-visible { border-color: var(--accent); outline: none; }
.opt.good { background: var(--done); border-color: var(--done-edge); cursor: default; }
.opt.bad { background: var(--rej); border-color: var(--rej-edge); cursor: default; }
.opt.dim { color: var(--muted); cursor: default; }
.opt.dim:hover { border-color: var(--line); }
.feedback { background: color-mix(in srgb, var(--done) 55%, var(--surface)); border-radius: 3px; padding: 12px 16px; display: flex; flex-direction: column; gap: 8px; }
.feedback.bad { background: color-mix(in srgb, var(--rej) 55%, var(--surface)); }
.feedback p { max-width: 72ch; }
.qrev { border: 1px solid var(--done-edge); background: var(--surface); border-radius: 3px; padding: 10px 14px; display: flex; flex-direction: column; gap: 4px; max-width: 860px; }
.qrev.bad { border-color: var(--rej-edge); }
.qrev .qq { font-weight: 600; }
.qrev .small { font-size: .88rem; }
.qrev .small.muted { max-width: 76ch; }
.revbox { max-width: 860px; gap: 10px; }
.score { font-family: var(--font-code); font-size: 1.5rem; font-weight: 600; }

/* 좁은 화면: 한 줄로 쌓는다. 예시는 옆으로 넘기는 한 줄, 설정은 현재 값 요약과 함께 접어 둔다. */
@media (max-width: 900px) {
  .grid, .grid.haspic { grid-template-columns: minmax(0, 1fr); grid-template-areas: "ctl" "bar" "stage" "code"; }
  .grid.haspic { grid-template-areas: "ctl" "bar" "pic" "stage"; }
  .grid.qgrid { grid-template-areas: "ctl" "code" "bar" "stage"; }
  .grid.qgrid.haspic, .grid.qgrid.qwide.haspic { grid-template-columns: minmax(0, 1fr); grid-template-areas: "ctl" "code" "bar" "pic" "stage"; }
  .grid.qgrid.qwide { grid-template-areas: "ctl" "code" "bar" "stage"; }
  .grid.qgrid.qwide .asks { column-count: 1; }
  .grid.haspic .p-pic, .grid:not(.haspic) .p-code { position: static; max-height: none; }
  .presets { display: flex; overflow-x: auto; padding-bottom: 4px; scroll-snap-type: x proximity; }
  .preset { flex: 0 0 min(230px, 72vw); scroll-snap-align: start; }
  .ctlsum { display: block; }
  .p-ctl.shut .ctls { display: none; }
  .panel.p-bar { padding: 8px 12px 10px; gap: 6px; }
  .p-bar .btn { padding: 4px 10px; font-size: .88rem; }
  .p-bar .lng { display: none; }
  .p-bar .clock { font-size: .78rem; margin-left: 0; }
  .p-bar .log { max-height: 138px; font-size: .9rem; }
  .headcols { grid-template-columns: minmax(0, 1fr); }
  .terms { columns: 1; }
  .about { order: -1; padding-left: 0; margin-left: 0; border-left: 0; }
  .p-bar .stale { margin-left: 0; flex-basis: 100%; }
  .p-bar.asking { position: static; }
  .p-bar .predtoggle { margin-left: 0; }
}
@media (min-width: 901px) { #ctl-toggle { display: none; } }
/* 넓은 화면: 좌우의 빈 자리를 쓴다. 처음 화면의 분야는 세 칸, 분야의 목차는 두 칸. 실습은 1600px 이상이면 코드 | 그림 | 실행표 세 칸(wide3는 스크립트가 붙인다). */
@media (min-width: 1400px) {
  .headcols { grid-template-columns: minmax(0, 2.3fr) minmax(0, 1fr); }
  .terms { columns: 3; }
  .wrap { max-width: 1680px; padding-inline: 32px; }
  .hgrid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hgrid.small { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .catview { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 48px; align-items: start; }
  .catview > :not(.cgroup) { grid-column: 1 / -1; }
  .grid.haspic.wide3 { grid-template-columns: minmax(0, .92fr) minmax(0, 1.2fr) minmax(0, 1fr); grid-template-areas: "ctl ctl ctl" "bar bar bar" "code pic stage"; }
  .grid.haspic.wide3 .p-code { position: sticky; top: calc(var(--barh, 104px) + 10px); max-height: calc(100vh - var(--barh, 104px) - 20px); overflow-y: auto; }
}