/* 퀀트 공부 — 트레이딩 데스크 톤. 기본은 어둡게, ◐ 로 밝게. */
:root {
  --bg: #0b0e13; --bg2: #0e1218; --panel: #121821; --panel2: #18202b; --text: #dfe5ec; --muted: #7d8a99; --line: #1f2833; --line2: #2a3644;
  --accent: #36c2b4; --accent-soft: rgba(54,194,180,.12); --good: #2fd27a; --good-soft: rgba(47,210,122,.12);
  --warn: #f0b429; --warn-soft: rgba(240,180,41,.12); --bad: #ff5c6c; --bad-soft: rgba(255,92,108,.12);
  --gl: #a48bff; --gl-soft: rgba(164,139,255,.13); --code: #0f141b; --shadow: 0 1px 0 rgba(255,255,255,.02) inset, 0 8px 24px rgba(0,0,0,.25);
  --grid: rgba(120,150,180,.045); --glow: 0 0 0 1px rgba(54,194,180,.35), 0 0 18px rgba(54,194,180,.12);
  --nav-w: 252px; --rail-w: 52px; --radius: 8px;
  --mono: "JetBrains Mono", "D2Coding", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f4f5f2; --bg2: #eceee9; --panel: #ffffff; --panel2: #f0f2ee; --text: #151a20; --muted: #5f6b77; --line: #dfe3dc; --line2: #cfd5cc;
  --accent: #0e8a7e; --accent-soft: rgba(14,138,126,.09); --good: #138a4a; --good-soft: rgba(19,138,74,.1);
  --warn: #a86b00; --warn-soft: rgba(240,180,41,.16); --bad: #c62839; --bad-soft: rgba(198,40,57,.09);
  --gl: #6a4fd6; --gl-soft: rgba(106,79,214,.09); --code: #f1f3ef; --shadow: 0 1px 2px rgba(20,30,40,.05);
  --grid: rgba(20,40,60,.035); --glow: 0 0 0 1px rgba(14,138,126,.4);
  color-scheme: light;
}
* { box-sizing: border-box; }
html { font-size: 15.5px; }
body { margin: 0; background: var(--bg); color: var(--text);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px; background-attachment: fixed;
  font-family: "IBM Plex Sans KR", "Pretendard", "Noto Sans KR", "Noto Sans CJK KR", system-ui, sans-serif;
  line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: var(--accent-soft); }
.layout { display: flex; min-height: 100vh; }
/* ── 사이드바 (접기/펴기) ── */
nav.side { width: var(--nav-w); flex: 0 0 var(--nav-w); background: var(--bg2); border-right: 1px solid var(--line);
  position: sticky; top: 0; height: 100vh; overflow-y: auto; overflow-x: hidden; padding: 0 10px 30px;
  transition: width .18s ease, flex-basis .18s ease, padding .18s ease; scrollbar-width: thin; }
nav.side .top { display: flex; align-items: center; gap: 6px; height: 54px; position: sticky; top: 0; background: var(--bg2);
  margin: 0 -10px 6px; padding: 0 10px; border-bottom: 1px solid var(--line); z-index: 2; }
nav.side .brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.02rem; color: var(--text);
  letter-spacing: -.01em; white-space: nowrap; flex: 1; min-width: 0; }
nav.side .brand:hover { text-decoration: none; }
nav.side .brand img { width: 24px; height: 24px; flex: 0 0 auto; }
nav.side .brand .tick { font-family: var(--mono); font-size: .66rem; font-weight: 600; color: var(--accent); border: 1px solid var(--line2);
  padding: 0 5px; border-radius: 4px; letter-spacing: .06em; }
.navbtn { width: 30px; height: 30px; flex: 0 0 30px; display: inline-grid; place-items: center; border-radius: 6px; border: 1px solid transparent;
  background: transparent; color: var(--muted); cursor: pointer; padding: 0; }
.navbtn:hover { border-color: var(--line2); color: var(--text); background: var(--panel2); }
.navbtn svg { width: 16px; height: 16px; transition: transform .18s ease; }
nav.side .sec { font-family: var(--mono); font-size: .66rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em;
  margin: 18px 10px 6px; display: flex; align-items: center; gap: 8px; white-space: nowrap; }
nav.side .sec::after { content: ""; flex: 1; height: 1px; background: var(--line); }
nav.side a.item { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 5px 10px; border-radius: 6px;
  color: var(--text); font-size: .9rem; white-space: nowrap; border-left: 2px solid transparent; }
nav.side a.item > :first-child, nav.side a.item { overflow: hidden; text-overflow: ellipsis; }
nav.side a.item:hover { background: var(--panel2); text-decoration: none; }
nav.side a.item.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; border-left-color: var(--accent); border-radius: 0 6px 6px 0; }
nav.side a.sub { padding-left: 22px; font-size: .82rem; color: var(--muted); }
nav.side .cnt { font-family: var(--mono); font-size: .7rem; color: var(--muted); font-variant-numeric: tabular-nums; flex: 0 0 auto; }
nav.side a.item.on .cnt { color: var(--accent); }
nav.side .foot { margin-top: 20px; padding: 12px 8px 0; display: flex; gap: 6px; border-top: 1px solid var(--line); }
html[data-nav="closed"] nav.side { width: var(--rail-w); flex-basis: var(--rail-w); padding: 0 8px; overflow: hidden; }
html[data-nav="closed"] nav.side .top { flex-direction: column; height: auto; gap: 8px; padding: 12px 8px; margin: 0 -8px 8px; }
html[data-nav="closed"] nav.side .brand { flex: 0 0 auto; }
html[data-nav="closed"] nav.side .brand span, html[data-nav="closed"] nav.side .sec,
html[data-nav="closed"] nav.side a.item, html[data-nav="closed"] nav.side .foot a { display: none; }
html[data-nav="closed"] nav.side .foot { flex-direction: column; border-top: none; padding: 0; align-items: center; }
html[data-nav="closed"] #navtoggle svg { transform: rotate(180deg); }
html[data-nav="closed"] nav.side .rail { display: flex; }
nav.side .rail { display: none; flex-direction: column; align-items: center; gap: 4px; }
nav.side .rail a { width: 34px; height: 30px; display: grid; place-items: center; border-radius: 6px; font-family: var(--mono);
  font-size: .68rem; font-weight: 600; color: var(--muted); border-left: 2px solid transparent; }
nav.side .rail a:hover { background: var(--panel2); color: var(--text); text-decoration: none; }
nav.side .rail a.on { color: var(--accent); background: var(--accent-soft); border-left-color: var(--accent); }
main { flex: 1; min-width: 0; padding: 26px 38px 70px; max-width: 1320px; }
@media (max-width: 860px) {
  main { padding: 18px 16px 60px; }
  html:not([data-nav="open"]) nav.side { width: var(--rail-w); flex-basis: var(--rail-w); padding: 0 8px; overflow: hidden; }
  html:not([data-nav="open"]) nav.side .top { flex-direction: column; height: auto; gap: 8px; padding: 12px 8px; margin: 0 -8px 8px; }
  html:not([data-nav="open"]) nav.side .brand span, html:not([data-nav="open"]) nav.side .sec,
  html:not([data-nav="open"]) nav.side a.item, html:not([data-nav="open"]) nav.side .foot a { display: none; }
  html:not([data-nav="open"]) nav.side .rail { display: flex; }
  html:not([data-nav="open"]) nav.side .foot { flex-direction: column; border-top: none; padding: 0; align-items: center; }
  html:not([data-nav="open"]) #navtoggle svg { transform: rotate(180deg); }
}
h1 { font-size: 1.62rem; margin: 6px 0 6px; line-height: 1.3; letter-spacing: -.02em; font-weight: 700; }
h2 { font-size: .78rem; margin: 30px 0 12px; font-family: var(--mono); font-weight: 600; text-transform: uppercase; letter-spacing: .05em;
  color: var(--muted); display: flex; align-items: center; gap: 10px; }
h2::before { content: ""; width: 6px; height: 6px; background: var(--accent); border-radius: 1px; flex: 0 0 auto; box-shadow: 0 0 8px var(--accent); }
h2::after { content: ""; flex: 1; height: 1px; background: var(--line); }
h2 :is(a, .muted, .small) { text-transform: none; letter-spacing: 0; font-family: inherit; }
h3 { font-size: 1.04rem; margin: 20px 0 8px; letter-spacing: -.01em; }
.muted { color: var(--muted); }
.small { font-size: .86rem; }
.crumb { font-family: var(--mono); font-size: .74rem; letter-spacing: .04em; color: var(--muted); margin-bottom: 6px; }
.crumb a { color: var(--muted); }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); }
.panel + .panel { margin-top: 14px; }
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.card { position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); display: block; color: var(--text);
  transition: border-color .15s, box-shadow .15s, transform .15s; }
.card::before { content: ""; position: absolute; left: -1px; top: 12px; bottom: 12px; width: 2px; background: var(--line2); border-radius: 2px; }
a.card:hover { border-color: transparent; box-shadow: var(--glow); text-decoration: none; transform: translateY(-1px); }
a.card:hover::before { background: var(--accent); }
.card .k { font-family: var(--mono); font-size: .7rem; letter-spacing: .03em; text-transform: uppercase; color: var(--muted); }
.card .t { font-weight: 650; font-size: 1.02rem; margin: 3px 0; letter-spacing: -.01em; font-variant-numeric: tabular-nums; }
.card .s { font-size: .85rem; color: var(--muted); }
.card.dim { opacity: .75; }
.bar { height: 4px; background: var(--panel2); border-radius: 1px; overflow: hidden; margin-top: 10px;
  background-image: repeating-linear-gradient(90deg, transparent 0 9%, var(--bg) 9% 10%); }
.bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--good)); border-radius: 1px; box-shadow: 0 0 10px var(--good-soft); }
.btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: var(--panel); color: var(--text);
  padding: 6px 13px; border-radius: 6px; font: inherit; font-size: .88rem; cursor: pointer; text-decoration: none; transition: border-color .15s, background .15s; }
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #04110f; font-weight: 600; }
:root[data-theme="light"] .btn.primary { color: #fff; }
.btn.primary:hover { filter: brightness(1.07); }
.btn.big { padding: 10px 20px; font-size: 1.02rem; font-weight: 600; }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .5; cursor: default; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.badge { display: inline-block; font-family: var(--mono); font-size: .68rem; letter-spacing: .03em; padding: 1px 7px; border-radius: 4px; background: var(--panel2); color: var(--muted); border: 1px solid var(--line); white-space: nowrap; }
.badge.good { background: var(--good-soft); color: var(--good); border-color: transparent; }
.badge.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.badge.acc { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.badge.gl { background: var(--gl-soft); color: var(--gl); border-color: transparent; }
table.list { width: 100%; border-collapse: collapse; font-size: .93rem; }
table.list th { text-align: left; font-weight: 600; color: var(--muted); font-family: var(--mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; border-bottom: 1px solid var(--line2); padding: 7px 8px; }
table.list td { border-bottom: 1px solid var(--line); padding: 8px 8px; vertical-align: top; }
table.list tr:hover td { background: var(--panel2); }
table.list td.c { text-align: center; width: 42px; }
table.list td.num { white-space: nowrap; color: var(--muted); font-family: var(--mono); font-size: .84rem; font-variant-numeric: tabular-nums; }
.chk { width: 18px; height: 18px; cursor: pointer; accent-color: var(--good); vertical-align: middle; }
label.done { display: inline-flex; gap: 8px; align-items: center; cursor: pointer; padding: 6px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); }
label.done.on { background: var(--good-soft); border-color: transparent; color: var(--good); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: .8rem; padding: 2px 9px; border-radius: 5px; border: 1px solid var(--line); background: var(--panel); color: var(--text); }
.chip.done { background: var(--good-soft); color: var(--good); border-color: transparent; }
.chip.note::after { content: " ✎"; color: var(--accent); }
a.chip:hover { border-color: var(--accent); text-decoration: none; }
/* 문서 본문 */
.doc { font-size: 1rem; }
.doc h1 { font-size: 1.5rem; }
.doc h2 { font-family: inherit; font-size: 1.24rem; text-transform: none; letter-spacing: -.01em; color: var(--text); display: block;
  border-bottom: 1px solid var(--line); padding-bottom: 4px; margin-top: 34px; }
.doc h2::before, .doc h2::after { content: none; }
.doc p, .doc li { max-width: 78ch; }
.doc img { max-width: 100%; border-radius: 6px; border: 1px solid var(--line); background: #fff; }
.doc blockquote { margin: 10px 0; padding: 8px 14px; border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; }
.doc blockquote p { margin: 4px 0; }
.doc code { background: var(--code); padding: 1px 5px; border-radius: 4px; font-size: .88em; font-family: "JetBrains Mono", "D2Coding", ui-monospace, monospace; }
.doc pre { font-family: var(--mono); background: var(--code); padding: 12px 14px; border-radius: 6px; overflow-x: auto; border: 1px solid var(--line); }
.doc pre code { background: none; padding: 0; }
.tablewrap { overflow-x: auto; margin: 10px 0; }
.doc table { border-collapse: collapse; font-size: .92rem; min-width: 50%; }
.doc th, .doc td { border: 1px solid var(--line); padding: 6px 10px; vertical-align: top; }
.doc th { background: var(--panel2); font-weight: 600; }
.doc a.ext::after { content: " ↗"; font-size: .8em; }
.doc a.missing { color: var(--muted); text-decoration: line-through dotted; cursor: help; }
.doc a.path code { color: var(--accent); }
.doc ul.contains-task-list { list-style: none; padding-left: 1.2em; }
.doc .math.block { overflow-x: auto; margin: 12px 0; }
.doc hr { border: none; border-top: 1px solid var(--line); margin: 24px 0; }
.with-toc { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 26px; align-items: start; }
.toc { position: sticky; top: 14px; font-size: .84rem; max-height: calc(100vh - 30px); overflow-y: auto; border-left: 2px solid var(--line); padding-left: 12px; }
.toc a { display: block; color: var(--muted); padding: 2px 0; }
.toc a.l3 { padding-left: 12px; font-size: .8rem; }
.toc a:hover { color: var(--accent); }
@media (max-width: 1100px) { .with-toc { grid-template-columns: 1fr; } .toc { display: none; } }
/* 용어 강조 */
.gl { border-bottom: 1.5px dotted var(--gl); cursor: help; }
.gl:hover, .gl:focus { background: var(--gl-soft); outline: none; }
#glpop { position: absolute; z-index: 50; max-width: 380px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 6px 24px rgba(0,0,0,.18); padding: 10px 13px; font-size: .88rem; display: none; line-height: 1.5; }
#glpop .h { font-weight: 700; }
#glpop .ml { color: var(--gl); margin-top: 4px; }
#glpop .f { color: var(--muted); font-size: .8rem; margin-top: 4px; }
/* 메타 표 */
dl.meta { display: grid; grid-template-columns: 110px 1fr; gap: 6px 14px; margin: 0; }
dl.meta dt { color: var(--muted); font-size: .86rem; padding-top: 2px; }
dl.meta dd { margin: 0; }
/* 작업 진행 */
.job { display: flex; gap: 12px; align-items: center; padding: 12px 14px; border-radius: 10px; background: var(--warn-soft); color: var(--warn); }
.job.fail { background: var(--bad-soft); color: var(--bad); }
.spin { width: 18px; height: 18px; border: 2.5px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: sp 0.9s linear infinite; flex: 0 0 auto; }
@keyframes sp { to { transform: rotate(360deg); } }
/* 브리핑 */
.brief-head { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: start; }
.brief-thumb { width: 300px; border-radius: 10px; border: 1px solid var(--line); }
.gist { font-size: 1.05rem; }
.gist li { margin: 4px 0; }
.terms { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 10px; }
.term { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--panel); }
.term .n { font-weight: 650; }
.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { display: flex; gap: 12px; padding: 4px 0; }
.timeline .t { font-family: var(--mono); font-size: .86rem; font-variant-numeric: tabular-nums; color: var(--accent); min-width: 54px; }
/* 질문하기 */
.qa .item { border-top: 1px solid var(--line); padding: 10px 0; }
.qa .q { font-weight: 600; }
.qa .q::before { content: "Q. "; color: var(--accent); }
.qa .a { margin-top: 6px; }
.qa textarea { width: 100%; min-height: 66px; padding: 9px 11px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); color: var(--text); font: inherit; resize: vertical; }
.search { width: 100%; max-width: 520px; padding: 9px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); color: var(--text); font: inherit; font-size: 1rem; }
.gterm { scroll-margin-top: 14px; }
.gterm.hit { outline: 2px solid var(--gl); }
.hidden { display: none !important; }
details > summary { cursor: pointer; }
.flash { padding: 10px 14px; border-radius: 8px; background: var(--good-soft); color: var(--good); margin-bottom: 12px; }
.empty { padding: 26px; text-align: center; color: var(--muted); border: 1px dashed var(--line2); border-radius: 8px; }
@media print { nav.side, .qa, .noprint { display: none !important; } main { padding: 0; } }
.brief-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 14px; margin-top: 16px; align-items: start; }
.brief-grid .col { display: grid; gap: 14px; }
.brief-grid .col > .panel + .panel { margin-top: 0; }
.warnbox { border-left: 4px solid var(--warn); }
@media (max-width: 1000px) { .brief-grid { grid-template-columns: 1fr; } .brief-head { grid-template-columns: 1fr; } .brief-thumb { width: 100%; max-width: 420px; } }
/* 숫자 · 코드는 고정폭 */
.num, .mono, .cnt, code, kbd { font-variant-numeric: tabular-nums; }
.mono, kbd { font-family: var(--mono); }
input, select, textarea { accent-color: var(--accent); }
.search:focus, .qa textarea:focus, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: none; border-color: var(--accent); box-shadow: var(--glow); }
.panel { border-radius: var(--radius); }
.doc img { background: #fff; }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: var(--line2); border-radius: 9px; border: 2px solid var(--bg); }
::-webkit-scrollbar-track { background: transparent; }
@media print { body { background: #fff; color: #000; background-image: none; } }
/* 패널 · 카드 안의 h2 는 보통 제목 (섹션 머리띠는 본문 바로 아래 h2 만) */
:is(.panel, .row, .card) h2 { font-family: inherit; text-transform: none; letter-spacing: -.01em; color: var(--text); font-size: 1.08rem; font-weight: 650; }
:is(.panel, .row, .card) h2::after { content: none; }
/* 영상 · 오디오 */
.media-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 10px; }
.media-form .vpick { display: inline-flex; gap: 8px; align-items: center; font-size: .86rem; color: var(--muted); }
.media-form select { font: inherit; font-size: .88rem; padding: 6px 8px; border-radius: 6px; border: 1px solid var(--line2); background: var(--panel2); color: var(--text); max-width: 100%; }
.mlist { margin-top: 12px; display: grid; gap: 8px; }
.mitem { border-top: 1px solid var(--line); padding-top: 8px; }
.card .media { margin-top: 10px; box-shadow: none; background: var(--bg2); }
.card .media h2 { font-size: .95rem; }