/* 검색용 정적 개념 페이지 (public/concepts, scripts/build-pages.mjs 가 만든다). 앱 CSS 없이 혼자 선다 */
:root {
  --bg: #f5f7fb; --surface: #ffffff; --ink: #191f28; --ink-2: #4e5968; --ink-3: #8b95a1; --line: #e5e8eb;
  --accent: #3182f6; --accent-soft: #e8f3ff; --on-accent: #ffffff; --code: #f2f4f6;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --bg: #0f1013; --surface: #1b1d22; --ink: #eef1f4; --ink-2: #b0b8c1; --ink-3: #7e8794; --line: #2c2f36; --accent: #4c94ff; --accent-soft: #16243a; --on-accent: #ffffff; --code: #24272e; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.7 "Pretendard Variable", Pretendard, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif; word-break: keep-all; overflow-wrap: anywhere; -webkit-text-size-adjust: 100%; }
a { color: var(--accent); }
.pg-top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); }
.pg-brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 18px; color: var(--ink); text-decoration: none; }
.pg-mark { display: grid; justify-items: center; gap: 2px; width: 22px; }
.pg-mark i { display: block; height: 5px; border-radius: 2px; }
.pg-mark i:nth-child(1) { width: 45%; background: #a9c6f7; }
.pg-mark i:nth-child(2) { width: 72%; background: #7aa6f2; }
.pg-mark i:nth-child(3) { width: 100%; background: #4c83e8; }
.pg-open { font-size: 14px; font-weight: 700; text-decoration: none; padding: 8px 14px; border-radius: 10px; background: var(--accent-soft); }
.pg { max-width: 720px; margin: 0 auto; padding: 8px 16px 48px; }
.pg-crumb { font-size: 13px; color: var(--ink-3); }
.pg-crumb a { color: var(--ink-2); text-decoration: none; }
h1 { font-size: 28px; line-height: 1.3; letter-spacing: -0.01em; margin: 10px 0 4px; }
h2 { font-size: 20px; line-height: 1.4; margin: 36px 0 10px; }
h3 { font-size: 17px; margin: 22px 0 8px; }
.pg-meta { color: var(--ink-2); font-size: 15px; margin: 0 0 8px; }
.pg-soft { color: var(--ink-2); font-size: 14px; }
.pg-card { background: var(--surface); border-radius: 16px; padding: 4px 20px 16px; margin-top: 20px; }
.pg-easy h2 { margin-top: 16px; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
code, pre { font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace; font-size: 14px; }
code { background: var(--code); padding: 1px 5px; border-radius: 5px; }
pre { background: var(--code); padding: 14px 16px; border-radius: 12px; overflow-x: auto; line-height: 1.55; white-space: pre; overflow-wrap: normal; word-break: normal; }
pre code { background: none; padding: 0; }
.pg-tw { overflow-x: auto; margin: 8px 0; padding: 4px 8px; border-radius: 12px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
thead th { font-size: 13px; color: var(--ink-3); font-weight: 600; }
tbody tr:last-child > * { border-bottom: 0; }
.pg-html { overflow-x: auto; }
.pg-html table { background: var(--surface); border-radius: 12px; }
.pg-q { background: var(--surface); border-radius: 14px; padding: 14px 18px; margin: 10px 0; }
.pg-qt { margin: 0 0 6px; font-weight: 600; }
.pg-ch { margin: 0 0 8px; }
details summary { cursor: pointer; color: var(--accent); font-weight: 700; font-size: 14px; padding: 4px 0; }
details p { margin: 6px 0; }
.pg-cta { background: var(--accent-soft); border-radius: 18px; padding: 4px 20px 20px; margin: 36px 0; }
.pg-cta h2 { margin-top: 18px; }
.pg-cta p { margin: 0 0 14px; color: var(--ink-2); }
.pg-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 18px; margin: 4px 8px 4px 0; border-radius: 14px; background: #1b64da; color: var(--on-accent); font-weight: 700; text-decoration: none; }
.pg-btn.ghost { background: var(--surface); color: var(--accent); }
.pg-links { list-style: none; padding: 0; display: grid; gap: 8px; }
.pg-links li { background: var(--surface); border-radius: 12px; padding: 12px 16px; margin: 0; display: grid; gap: 2px; }
.pg-links a { font-weight: 700; text-decoration: none; }
.pg-links span { font-size: 14px; color: var(--ink-2); }
.pg-certs { list-style: none; padding: 0; display: grid; gap: 10px; margin-top: 20px; }
.pg-certs a { display: grid; gap: 2px; background: var(--surface); border-radius: 16px; padding: 16px 18px; text-decoration: none; color: var(--ink); }
.pg-certs span { font-size: 14px; color: var(--ink-2); }
.pg-foot { max-width: 720px; margin: 0 auto; padding: 24px 16px 40px; font-size: 13px; color: var(--ink-3); border-top: 1px solid var(--line); }
.pg-foot a { color: var(--ink-2); }
@media (min-width: 720px) { h1 { font-size: 34px; } .pg { padding-top: 16px; } }
.pg-figs { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin: 8px 0; }
.pg-figs figure { margin: 0; font-size: 13px; }
.pg-figs img, .pg-qt img { display: block; width: 100%; max-width: 360px; height: auto; border-radius: 10px; background: var(--surface); }
.pg-figs small, .pg-qt small { color: var(--ink-3, #8b95a1); font-size: 11px; }

/* 개념 도식 (js/dia.js, app.css 와 같은 모양) */
.dia { margin: 6px 0 0; display: grid; gap: 8px; min-width: 0; }
.dia figcaption { font-size: 13px; line-height: 1.5; color: var(--ink-3); }
.dia b { font-weight: 700; color: var(--ink); }
.dia span { color: var(--ink-2); }
.dia-stack, .dia-flow { list-style: none; margin: 0; padding: 0; display: grid; }
.dia-stack { gap: 4px; }
.dia-stack li { display: grid; grid-template-columns: minmax(88px, 36%) minmax(0, 1fr); gap: 12px; align-items: baseline; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); font-size: 14px; line-height: 1.45; }
.dia-flow { gap: 22px; }
.dia-flow li { position: relative; display: grid; gap: 2px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); font-size: 14px; line-height: 1.45; }
.dia-flow li + li::before { content: ""; position: absolute; left: 22px; top: -18px; width: 2px; height: 14px; background: var(--ink-3); border-radius: 1px; }
.dia-flow li + li::after { content: ""; position: absolute; left: 17px; top: -8px; width: 12px; height: 7px; background: var(--ink-3); clip-path: polygon(0 0, 100% 0, 50% 100%); }
.dia-stack li.on, .dia-flow li.on { background: var(--accent-soft); border-color: var(--accent); }
.dia-stack li.on b, .dia-flow li.on b { color: var(--accent); }
.dia-seq { display: grid; gap: 10px; padding: 12px 14px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.dia-actors { display: flex; justify-content: space-between; gap: 12px; }
.dia-actors b { padding: 4px 12px; border-radius: 999px; background: var(--line); font-size: 13px; }
.dia-msg { display: grid; gap: 4px; padding: 0 6px; }
.dia-lbl { display: grid; justify-items: center; text-align: center; font-size: 13px; line-height: 1.4; }
.dia-msg i { position: relative; display: block; height: 2px; background: var(--ink-3); border-radius: 1px; }
.dia-msg i::after { content: ""; position: absolute; top: -5px; width: 10px; height: 12px; background: var(--ink-3); }
.dia-msg.ltr i::after { right: -2px; clip-path: polygon(0 0, 100% 50%, 0 100%); }
.dia-msg.rtl i::after { left: -2px; clip-path: polygon(100% 0, 0 50%, 100% 100%); }
.dia-cells { display: grid; gap: 12px; }
.dia-row { display: grid; gap: 6px; }
.dia-rl { font-size: 13px; color: var(--ink-3); }
.dia-gs { display: flex; flex-wrap: wrap; gap: 8px 12px; }
.dia-g { display: grid; gap: 4px; justify-items: center; }
.dia-c { display: flex; }
.dia-c span { min-width: 30px; height: 34px; padding: 0 6px; display: grid; place-items: center; border: 1px solid var(--line); margin-left: -1px; background: var(--surface); font: 600 14px/1 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--ink); }
.dia-c span:first-child { margin-left: 0; border-radius: 8px 0 0 8px; }
.dia-c span:last-child { border-radius: 0 8px 8px 0; }
.dia-c span:only-child { border-radius: 8px; }
.dia-c span.on { position: relative; background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.dia-g small { font-size: 12px; color: var(--ink-3); }