/* 도도동 바이브 코딩 교실 — 종이 공책 + 터미널 초록 */
:root {
  --bg: #F7F5EF; --paper: #FFFFFF; --ink: #1D1C24; --muted: #5E5B6B; --line: #E4E0D6;
  --accent: #0E8F6E; --accent-soft: #DDF3EA; --accent-ink: #0A6B53;
  --hot: #E8573A; --hot-soft: #FDE8E2;
  --code-bg: #17161D; --code-ink: #E7E5EE; --code-dim: #8D8A9B;
  --t-claude: #D9693F; --t-codex: #3B4A63; --t-antigravity: #2F6FE0; --t-cursor: #7A4FD6;
  --shadow: 0 1px 2px rgba(29,28,36,.06), 0 6px 20px rgba(29,28,36,.06);
  --radius: 14px;
  --sans: "Pretendard Variable", Pretendard, -apple-system, "Malgun Gothic", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, "Pretendard Variable", Pretendard, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121117; --paper: #1A1922; --ink: #ECEAF2; --muted: #A19EB0; --line: #2C2A36;
    --accent: #3BD19F; --accent-soft: #143A2F; --accent-ink: #6FE3BB;
    --hot: #FF7A5C; --hot-soft: #3A1E18; --code-bg: #0C0B10;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121117; --paper: #1A1922; --ink: #ECEAF2; --muted: #A19EB0; --line: #2C2A36;
  --accent: #3BD19F; --accent-soft: #143A2F; --accent-ink: #6FE3BB;
  --hot: #FF7A5C; --hot-soft: #3A1E18; --code-bg: #0C0B10;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25); color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.75 var(--sans); word-break: keep-all; overflow-wrap: anywhere; }
a { color: var(--accent-ink); }
img { max-width: 100%; height: auto; border-radius: 10px; }
code { font-family: var(--mono); font-size: .88em; background: var(--accent-soft); color: var(--accent-ink); padding: .1em .4em; border-radius: 6px; }

/* 윗줄 */
.top { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px; height: 60px; padding: 0 20px;
  background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.logo { font-family: var(--mono); font-size: 14px; font-weight: 600; background: var(--code-bg); color: var(--accent); padding: 3px 8px; border-radius: 8px; }
:root[data-theme="dark"] .logo { color: #3BD19F; }
.by { color: var(--muted); font-size: 13px; font-family: var(--mono); margin-left: auto; }
.top button { border: 1px solid var(--line); background: var(--paper); color: var(--ink); border-radius: 10px; height: 36px; min-width: 36px; font-size: 16px; cursor: pointer; }
.menu { display: none; }

/* 목차 */
.layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); max-width: 1240px; margin: 0 auto; }
.side { position: sticky; top: 60px; align-self: start; height: calc(100vh - 60px); overflow-y: auto; padding: 24px 16px 24px 20px; border-right: 1px solid var(--line); }
.parts, .chapters { list-style: none; margin: 0; padding: 0; }
.parts > li > a { display: flex; gap: 10px; align-items: baseline; padding: 8px 10px; border-radius: 10px; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 15px; line-height: 1.45; }
.parts > li > a:hover { background: var(--paper); }
.parts > li.on > a { background: var(--accent-soft); color: var(--accent-ink); }
.parts .num { flex: none; min-width: 36px; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.parts > li.on .num { color: var(--accent-ink); }
.chapters { margin: 4px 0 10px 46px; border-left: 2px solid var(--line); }
.chapters a { display: block; padding: 4px 10px; font-size: 14px; line-height: 1.5; color: var(--muted); text-decoration: none; }
.chapters a:hover, .chapters a.here { color: var(--accent-ink); }
.chapters a.here { border-left: 2px solid var(--accent); margin-left: -2px; }
.side-foot { margin-top: 24px; font-size: 13px; color: var(--muted); padding: 0 10px; }

main { min-width: 0; padding: 40px 48px 80px; }

/* 머리 */
.hero { margin-bottom: 36px; }
.kicker { font-family: var(--mono); font-size: 13px; font-weight: 600; letter-spacing: .14em; color: var(--hot); }
.hero h1 { margin: 8px 0 14px; font-size: clamp(30px, 5vw, 46px); line-height: 1.2; letter-spacing: -.02em; font-weight: 800; }
.partnum { display: inline-block; margin-right: 14px; padding: 2px 12px; border-radius: 10px; font-size: .55em; vertical-align: .35em; background: var(--ink); color: var(--bg); font-family: var(--mono); }
.lead { font-size: 19px; color: var(--muted); max-width: 720px; margin: 0; }
.make { display: inline-flex; gap: 10px; align-items: baseline; margin: 18px 0 0; padding: 10px 16px; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; }
.make span { flex: none; font-size: 13px; font-weight: 700; color: var(--accent-ink); }

/* 표지 */
.cover h1 { font-size: clamp(36px, 7vw, 64px); }
.cover h1 em { font-style: normal; color: var(--accent); }
.tools { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0; }
.chip { font-size: 14px; font-weight: 700; padding: 6px 14px; border-radius: 999px; background: var(--paper); border: 1.5px solid currentColor; }
.tool-claude { color: var(--t-claude); } .tool-codex { color: var(--t-codex); } .tool-antigravity { color: var(--t-antigravity); } .tool-cursor { color: var(--t-cursor); }
:root[data-theme="dark"] .tool-codex { color: #9DB0D0; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .tool-codex { color: #9DB0D0; } }
.term { max-width: 720px; background: var(--code-bg); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.term .bar { display: flex; gap: 6px; padding: 10px 14px; background: rgba(255,255,255,.05); }
.term .bar i { width: 11px; height: 11px; border-radius: 50%; background: #3A3845; }
.term .bar i:first-child { background: #E8573A; }
.term pre { margin: 0; padding: 16px 18px 20px; color: var(--code-ink); font: 14px/1.9 var(--mono); white-space: pre-wrap; }
.term .u { color: #FFB86B; font-weight: 600; } .term .a { color: #3BD19F; font-weight: 600; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.card { display: flex; flex-direction: column; gap: 6px; padding: 20px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); color: var(--ink); text-decoration: none; transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card .num { font-family: var(--mono); font-size: 12px; color: var(--hot); font-weight: 600; }
.card strong { font-size: 19px; line-height: 1.4; }
.card .sum { color: var(--muted); font-size: 15px; line-height: 1.6; }
.card .count { margin-top: auto; padding-top: 8px; font-size: 13px; color: var(--accent-ink); font-weight: 600; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* 본문 */
.doc { max-width: 780px; }
.doc h2 { position: relative; margin: 56px 0 14px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 26px; line-height: 1.35; letter-spacing: -.01em; }
.doc h2:first-child { margin-top: 0; }
.doc h2 .anchor { position: absolute; left: -26px; color: var(--line); text-decoration: none; font-weight: 400; }
.doc h2:hover .anchor { color: var(--accent); }
.doc h3 { margin: 32px 0 8px; font-size: 20px; }
.doc > img, .doc p > img { display: block; width: auto; max-height: 560px; margin: 18px auto; border: 1px solid var(--line); }
.doc ul, .doc ol { padding-left: 1.3em; }
.doc li { margin: 4px 0; }
.doc li.check { list-style: none; margin-left: -1.3em; }
.doc li.check label { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; }
.doc li.check input { margin-top: .45em; width: 18px; height: 18px; accent-color: var(--accent); flex: none; }
.doc li.check input:checked + span { color: var(--muted); text-decoration: line-through; }
blockquote { margin: 18px 0; padding: 4px 18px; border-left: 4px solid var(--accent); color: var(--muted); }
.table { overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); }
table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.6; }
th, td { padding: 10px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
th { background: var(--bg); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
pre.code { margin: 18px 0; padding: 16px 18px; background: var(--code-bg); color: var(--code-ink); border-radius: 12px; overflow-x: auto; font: 14px/1.7 var(--mono); }
pre.code code { background: none; color: inherit; padding: 0; }

/* 교실 블록 */
.prompt { margin: 22px 0; border-radius: var(--radius); overflow: hidden; background: var(--code-bg); box-shadow: var(--shadow); }
.prompt figcaption { display: flex; align-items: center; gap: 10px; padding: 10px 12px 10px 16px; color: var(--code-dim); font-size: 13px; font-weight: 600; border-bottom: 1px solid rgba(255,255,255,.06); }
.prompt .dot { width: 8px; height: 8px; border-radius: 50%; background: #3BD19F; }
.prompt .copy { margin-left: auto; border: 1px solid rgba(255,255,255,.15); background: transparent; color: var(--code-ink); border-radius: 8px; padding: 4px 12px; font: 600 13px var(--sans); cursor: pointer; }
.prompt .copy:hover { background: rgba(255,255,255,.08); }
.prompt .copy.done { color: #3BD19F; border-color: #3BD19F; }
.prompt pre { margin: 0; padding: 14px 18px 18px; color: var(--code-ink); font: 15px/1.8 var(--sans); white-space: pre-wrap; }
.prompt pre code { background: none; color: inherit; padding: 0; font: inherit; }
.goal { margin: 22px 0; padding: 18px 20px; border-radius: var(--radius); background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.goal .label { font-size: 13px; font-weight: 800; color: var(--accent-ink); letter-spacing: .04em; }
.goal p { margin: 6px 0 0; }
.note { margin: 20px 0; padding: 14px 18px; border-radius: 12px; border: 1px solid var(--line); background: var(--paper); }
.note > strong { display: block; font-size: 14px; margin-bottom: 2px; }
.note p { margin: 4px 0; }
.note.tip > strong { color: var(--accent-ink); }
.note.warn { background: var(--hot-soft); border-color: color-mix(in srgb, var(--hot) 35%, transparent); }
.note.warn > strong { color: var(--hot); }
.steps { list-style: none; padding: 0; margin: 22px 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); gap: 10px; counter-reset: s; }
.steps li { position: relative; display: flex; flex-direction: column; gap: 4px; margin: 0; padding: 14px 14px 16px; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; }
.steps li:not(:last-child)::after { content: "→"; position: absolute; right: -10px; top: 18px; z-index: 1; width: 18px; height: 18px; display: grid; place-items: center; font-size: 12px; color: var(--accent-ink); background: var(--bg); border-radius: 50%; }
.steps .n { font-family: var(--mono); font-size: 12px; font-weight: 600; color: var(--hot); }
.steps strong { font-size: 16px; line-height: 1.4; }
.steps li > span:last-child:not(.n) { font-size: 14px; line-height: 1.55; color: var(--muted); }
@media (max-width: 900px) {
  .steps { grid-template-columns: 1fr; gap: 8px; }
  .steps li { display: grid; grid-template-columns: 22px 1fr; column-gap: 8px; row-gap: 0; padding: 10px 14px; }
  .steps .n { grid-row: span 2; padding-top: 3px; }
  .steps li:not(:last-child)::after { content: "↓"; right: auto; left: 50%; top: auto; bottom: -13px; transform: translateX(-50%); }
}
.soon { display: flex; gap: 12px; align-items: baseline; margin: 14px 0; padding: 12px 16px; border: 1.5px dashed var(--line); border-radius: 12px; color: var(--muted); font-size: 15px; }
.soon p { margin: 0; }
.badge { flex: none; font-size: 12px; font-weight: 700; padding: 2px 10px; border-radius: 999px; background: var(--bg); border: 1px solid var(--line); }

.tabs { margin: 22px 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); overflow: hidden; }
.tablist { display: flex; overflow-x: auto; border-bottom: 1px solid var(--line); background: var(--bg); }
.tab { flex: none; border: 0; background: none; padding: 12px 18px; font: 700 15px var(--sans); color: var(--muted); cursor: pointer; border-bottom: 3px solid transparent; }
.tab[aria-selected="true"] { color: currentColor; background: var(--paper); }
.tab.tool-claude[aria-selected="true"] { color: var(--t-claude); border-color: var(--t-claude); }
.tab.tool-codex[aria-selected="true"] { color: var(--t-codex); border-color: var(--t-codex); }
.tab.tool-antigravity[aria-selected="true"] { color: var(--t-antigravity); border-color: var(--t-antigravity); }
.tab.tool-cursor[aria-selected="true"] { color: var(--t-cursor); border-color: var(--t-cursor); }
.tabpanel { padding: 4px 20px 10px; }

.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 780px; margin-top: 64px; }
.pager a { display: flex; flex-direction: column; padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); color: var(--ink); text-decoration: none; font-weight: 700; line-height: 1.5; }
.pager a:hover { border-color: var(--accent); }
.pager small { font-size: 12px; color: var(--muted); font-weight: 600; }
.pager .next { text-align: right; }

/* 휴대폰 */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .menu { display: inline-block; }
  .side { position: fixed; z-index: 30; top: 60px; left: 0; width: min(320px, 86vw); background: var(--bg); transform: translateX(-102%); transition: transform .2s; box-shadow: var(--shadow); }
  body.nav-open .side { transform: none; }
  main { padding: 28px 16px 64px; }
  .by { display: none; }
  .brand { margin-right: auto; }
  .doc h2 .anchor { display: none; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
  body { font-size: 16px; }
  .lead { font-size: 17px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }