:root {
  color-scheme: light;
  --paper: #f4f4f1;
  --surface: #fafaf8;
  --ink: #151515;
  --muted: #686865;
  --line: #c9c9c4;
  --soft: #e8e8e3;
  --max: 1320px;
  font-family: Inter, Pretendard, "Noto Sans KR", Arial, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; color: var(--ink); background: var(--paper); }
button, input, select, textarea { font: inherit; color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }

.skip-link { position: fixed; z-index: 30; top: 12px; left: 12px; padding: 10px 14px; color: white; background: var(--ink); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.site-header { position: sticky; z-index: 20; top: 0; display: grid; grid-template-columns: 1fr auto; align-items: center; min-height: 72px; padding: 0 max(24px, calc((100vw - var(--max)) / 2)); border-bottom: 1px solid var(--line); background: rgba(244,244,241,.96); backdrop-filter: blur(12px); }
.brand { font-size: .875rem; font-weight: 700; text-decoration: none; }
.site-header nav { display: flex; gap: 28px; font-size: .875rem; }
.site-header nav a { padding: 11px 0; text-decoration: none; border-bottom: 1px solid transparent; }
.site-header nav a:hover, .site-header nav a[aria-current="page"] { border-color: var(--ink); }

main { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 32px 0 120px; }
.prototype-note { display: flex; justify-content: space-between; gap: 24px; margin-bottom: 56px; padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: .8125rem; line-height: 1.5; }
.prototype-note strong { color: var(--ink); font-size: .75rem; letter-spacing: .13em; }
.eyebrow { margin: 0 0 18px; color: var(--muted); font-size: .75rem; font-weight: 700; letter-spacing: .16em; }
.discussion-hero { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: clamp(48px, 8vw, 120px); align-items: end; padding-bottom: 64px; border-bottom: 1px solid var(--ink); }
.discussion-hero h1 { max-width: 12ch; margin: 0; font-size: clamp(3.3rem, 7vw, 6.6rem); line-height: .96; letter-spacing: -.065em; word-break: keep-all; }
.discussion-hero .lead { margin: 0; font-size: 1.0625rem; line-height: 1.75; word-break: keep-all; }
.hero-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 34px; background: var(--line); border: 1px solid var(--line); }
.hero-metrics div { padding: 16px; background: var(--surface); }
.hero-metrics dt { min-height: 30px; color: var(--muted); font-size: .75rem; line-height: 1.35; }
.hero-metrics dd { margin: 8px 0 0; font-size: 1.5rem; }

.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 28px; padding: 72px 0 24px; }
.section-heading h2 { margin: 0; font-size: 1.5rem; letter-spacing: -.035em; }
.section-heading p { max-width: 38rem; margin: 0; color: var(--muted); font-size: .875rem; line-height: 1.6; }
.topic-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.topic-card { display: grid; grid-template-columns: 76px minmax(0, 1fr) 260px 44px; gap: 28px; align-items: center; min-height: 190px; padding: 30px 8px; border-bottom: 1px solid var(--line); }
a.topic-card { text-decoration: none; transition: padding .18s ease, background .18s ease; }
a.topic-card:hover { padding-inline: 22px; background: var(--surface); }
.topic-number { align-self: start; color: var(--muted); font-size: .75rem; }
.topic-copy small, .type-label { color: var(--muted); font-size: .75rem; font-weight: 700; letter-spacing: .12em; }
.topic-copy h3 { max-width: 24ch; margin: 13px 0 10px; font-size: clamp(1.75rem, 3vw, 2.8rem); line-height: 1.08; letter-spacing: -.045em; word-break: keep-all; }
.topic-copy p { max-width: 52rem; margin: 0; color: var(--muted); font-size: .9375rem; line-height: 1.65; }
.topic-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin: 0; }
.topic-stats dt { color: var(--muted); font-size: .75rem; }
.topic-stats dd { margin: 7px 0 0; font-size: .875rem; }
.topic-arrow { font-size: 1.25rem; }
.topic-card.is-planned { opacity: .58; }

.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 32px; color: var(--muted); font-size: .8125rem; }
.breadcrumb a { text-underline-offset: 4px; }
.topic-hero { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 64px; padding-bottom: 52px; border-bottom: 1px solid var(--ink); }
.topic-hero h1 { max-width: 19ch; margin: 0; font-size: clamp(2.75rem, 5.8vw, 5.5rem); line-height: 1.03; letter-spacing: -.06em; word-break: keep-all; }
.topic-meta { align-self: end; }
.topic-meta dl { margin: 0 0 28px; border-top: 1px solid var(--line); }
.topic-meta dl div { display: flex; justify-content: space-between; gap: 24px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: .8125rem; }
.topic-meta dt { color: var(--muted); }
.topic-meta dd { margin: 0; }
.button-row { display: flex; flex-wrap: wrap; gap: 8px; }
.button, button.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 18px; cursor: pointer; border: 1px solid var(--ink); text-decoration: none; background: transparent; }
.button.primary { color: white; background: var(--ink); }
.button:hover { filter: invert(.1); }

.topic-layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 72px; padding-top: 64px; }
.content-column { min-width: 0; }
.content-block { padding-bottom: 64px; }
.block-kicker { display: flex; justify-content: space-between; gap: 24px; margin-bottom: 24px; padding-bottom: 13px; border-bottom: 1px solid var(--ink); }
.block-kicker h2 { margin: 0; font-size: 1.375rem; }
.block-kicker span { color: var(--muted); font-size: .75rem; letter-spacing: .09em; }
.summary-intro { margin: 0 0 32px; max-width: 52rem; font-size: 1.125rem; line-height: 1.75; word-break: keep-all; }
.sample-warning { margin: 0 0 24px; padding: 14px 16px; border-left: 3px solid var(--ink); background: var(--soft); font-size: .875rem; line-height: 1.55; }
.summary-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.summary-item { min-height: 190px; padding: 22px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.summary-item small { color: var(--muted); font-size: .75rem; font-weight: 700; letter-spacing: .12em; }
.summary-item h3 { margin: 30px 0 12px; font-size: 1.125rem; line-height: 1.35; }
.summary-item p { margin: 0; color: var(--muted); font-size: .875rem; line-height: 1.65; }
.version-line { display: flex; justify-content: space-between; gap: 20px; margin-top: 16px; padding: 14px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .8125rem; }

.context-panel { align-self: start; position: sticky; top: 104px; }
.context-panel section { padding: 20px 0; border-top: 1px solid var(--line); }
.context-panel section:last-child { border-bottom: 1px solid var(--line); }
.context-panel h2 { margin: 0 0 14px; color: var(--muted); font-size: .75rem; letter-spacing: .12em; }
.context-panel strong { display: block; font-size: 1.0625rem; line-height: 1.4; }
.context-panel p { margin: 8px 0 0; color: var(--muted); font-size: .875rem; line-height: 1.6; }
.context-panel a { display: inline-block; margin-top: 14px; font-size: .8125rem; text-underline-offset: 5px; }

.board-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.post-row { display: grid; grid-template-columns: 100px minmax(0, 1fr) 190px 32px; gap: 24px; align-items: center; min-height: 150px; padding: 24px 8px; border-bottom: 1px solid var(--line); }
a.post-row { text-decoration: none; transition: padding .18s ease, background .18s ease; }
a.post-row:hover { padding-inline: 20px; background: var(--surface); }
.post-row h3 { margin: 8px 0 8px; font-size: 1.1875rem; line-height: 1.35; }
.post-row p { margin: 0; color: var(--muted); font-size: .875rem; line-height: 1.55; }
.post-meta { display: grid; gap: 7px; color: var(--muted); font-size: .8125rem; }
.status-label { color: var(--ink); font-weight: 700; }

.post-layout { display: grid; grid-template-columns: minmax(0, 760px) 300px; justify-content: space-between; gap: 72px; padding-top: 48px; }
.post-article header { padding-bottom: 34px; border-bottom: 1px solid var(--ink); }
.post-article h1 { margin: 14px 0 22px; font-size: clamp(2.5rem, 5vw, 4.8rem); line-height: 1.05; letter-spacing: -.055em; word-break: keep-all; }
.author-line { display: flex; flex-wrap: wrap; gap: 16px; color: var(--muted); font-size: .8125rem; }
.post-body { padding: 40px 0; }
.post-body h2 { margin: 42px 0 14px; font-size: 1.25rem; }
.post-body p, .post-body li { font-size: 1rem; line-height: 1.85; word-break: keep-all; }
.post-body ul { padding-left: 22px; }
.source-box { margin-top: 34px; padding: 20px; border: 1px solid var(--line); background: var(--surface); }
.source-box strong { font-size: .875rem; }
.source-box p { margin-bottom: 0; color: var(--muted); font-size: .875rem; }

dialog { width: min(700px, calc(100% - 32px)); max-width: none; max-height: calc(100dvh - 32px); padding: 0; border: 0; color: var(--ink); background: transparent; }
dialog::backdrop { background: rgba(15,15,15,.48); backdrop-filter: blur(4px); }
.composer { display: grid; gap: 18px; max-height: calc(100dvh - 32px); overflow: auto; padding-bottom: 24px; border: 1px solid var(--ink); background: var(--surface); box-shadow: 14px 14px 0 rgba(0,0,0,.18); }
.composer header { display: flex; justify-content: space-between; align-items: start; padding: 24px; border-bottom: 1px solid var(--line); }
.composer header h2 { margin: 5px 0 0; font-size: 1.75rem; }
.close-button { width: 44px; height: 44px; cursor: pointer; border: 1px solid var(--line); border-radius: 50%; background: transparent; font-size: 1.4rem; }
.composer-context, .composer label, .composer-note, .composer-actions { margin-inline: 24px; }
.composer-context { display: grid; gap: 5px; padding: 15px; border: 1px solid var(--line); }
.composer-context small, .composer label { color: var(--muted); font-size: .8125rem; }
.composer-context strong { font-size: 1rem; line-height: 1.45; }
.composer label { display: grid; gap: 8px; }
.composer input, .composer select, .composer textarea { width: 100%; min-height: 46px; padding: 11px 12px; border: 1px solid var(--line); background: white; font-size: 1rem; }
.composer textarea { min-height: 160px; resize: vertical; }
.composer-note { margin-block: 0; color: var(--muted); font-size: .8125rem; line-height: 1.55; }
.composer-actions { display: flex; justify-content: flex-end; gap: 8px; }

@media (max-width: 940px) {
  .discussion-hero, .topic-hero, .topic-layout, .post-layout { grid-template-columns: 1fr; }
  .discussion-hero { align-items: start; }
  .topic-meta { max-width: 540px; }
  .context-panel { position: static; display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .topic-card { grid-template-columns: 60px minmax(0, 1fr) 36px; }
  .topic-stats { grid-column: 2; }
  .post-row { grid-template-columns: 86px minmax(0, 1fr) 28px; }
  .post-meta { grid-column: 2; }
}

@media (max-width: 700px) {
  .site-header { position: static; display: block; padding: 16px; }
  .site-header nav { gap: 14px; margin-top: 12px; overflow-x: auto; white-space: nowrap; }
  main { width: calc(100% - 32px); padding-top: 24px; }
  .prototype-note { display: block; margin-bottom: 40px; }
  .prototype-note span { display: block; margin-top: 6px; }
  .discussion-hero, .topic-hero { gap: 38px; padding-bottom: 42px; }
  .discussion-hero h1 { font-size: clamp(3rem, 16vw, 4.8rem); }
  .hero-metrics { grid-template-columns: 1fr; }
  .hero-metrics dt { min-height: 0; }
  .section-heading { display: block; padding-top: 52px; }
  .section-heading p { margin-top: 10px; }
  .topic-card, .post-row { grid-template-columns: 1fr auto; gap: 18px; padding-block: 26px; }
  .topic-number, .topic-copy, .topic-stats, .post-row>div:first-child, .post-row>div:nth-child(2), .post-meta { grid-column: 1 / 3; }
  .topic-arrow, .post-row>span:last-child { grid-column: 2; }
  .topic-stats { max-width: 280px; }
  .summary-grid, .context-panel { grid-template-columns: 1fr; }
  .summary-item { min-height: 0; }
  .version-line { display: block; }
  .version-line span { display: block; margin-top: 7px; }
  .composer-context, .composer label, .composer-note, .composer-actions { margin-inline: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; }
}