:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #191c22;
  --muted: #5d6573;
  --line: #e3e6ec;
  --accent: #1f5eff;
  --accent-soft: #e8efff;
  --code: #f1f3f6;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --surface: #1a1d24;
    --text: #e8eaef;
    --muted: #a0a7b4;
    --line: #2b2f39;
    --accent: #6d97ff;
    --accent-soft: #1f2a44;
    --code: #232731;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: 'Pretendard Variable', Pretendard, -apple-system, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  font-size: 17px; line-height: 1.75; word-break: keep-all; overflow-wrap: break-word;
}
a { color: var(--accent); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.header-inner { display: flex; align-items: center; gap: 24px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 20px; color: var(--text); text-decoration: none; }
.brand-mark { width: 30px; height: 30px; border-radius: 8px; background: var(--accent); color: #fff; display: grid; place-items: center; font-size: 16px; }
.cats { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; margin: 0 -16px; padding: 0 16px 8px; flex: 1 1 100%; }
.cats a { white-space: nowrap; color: var(--muted); text-decoration: none; padding: 4px 10px; border-radius: 999px; font-size: 15px; }
.cats a:hover { background: var(--accent-soft); color: var(--accent); }
@media (min-width: 760px) {
  .cats { flex: 1; margin: 0; padding: 0; justify-content: flex-end; }
}

.list-head { padding: 40px 0 24px; }
.list-head h1 { font-size: clamp(24px, 4vw, 32px); line-height: 1.35; margin: 0 0 8px; }
.list-head p { color: var(--muted); margin: 0; }
.eyebrow { font-size: 14px; font-weight: 600; color: var(--accent) !important; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-link { display: flex; flex-direction: column; gap: 8px; height: 100%; padding: 20px; color: inherit; text-decoration: none; }
.card h2 { font-size: 18px; line-height: 1.45; margin: 0; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.6; flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card time { font-size: 13px; color: var(--muted); }
.chip { align-self: flex-start; display: inline-block; font-size: 13px; font-weight: 600; color: var(--accent); background: var(--accent-soft); padding: 2px 10px; border-radius: 999px; text-decoration: none; }

.pager { display: flex; justify-content: space-between; align-items: center; margin: 32px 0; color: var(--muted); }

.post { max-width: 720px; margin: 0 auto; padding: 32px 0 16px; }
.post-head h1 { font-size: clamp(26px, 5vw, 34px); line-height: 1.35; margin: 12px 0 8px; letter-spacing: -0.01em; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; margin-bottom: 32px; font-size: 15px; }
.toc ol { margin: 8px 0 0; padding-left: 20px; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

.prose h2 { font-size: 23px; line-height: 1.4; margin: 48px 0 12px; padding-top: 8px; scroll-margin-top: 80px; }
.prose h3 { font-size: 19px; margin: 32px 0 8px; scroll-margin-top: 80px; }
.prose p, .prose ul, .prose ol { margin: 0 0 18px; }
.prose li { margin: 4px 0; }
.prose li.task { list-style: none; margin-left: -20px; }
.prose blockquote { margin: 24px 0; padding: 12px 20px; border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; }
.prose blockquote p:last-child { margin: 0; }
.prose code { background: var(--code); padding: 1px 6px; border-radius: 5px; font-size: .9em; }
.prose pre { background: var(--code); padding: 16px; border-radius: 10px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; }
.prose img { max-width: 100%; border-radius: 10px; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.table-wrap { overflow-x: auto; margin: 0 0 24px; border: 1px solid var(--line); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; background: var(--surface); }
th, td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--code); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }

.sources { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 14px; }
.sources h2 { font-size: 16px; margin: 0 0 8px; }
.sources ul { padding-left: 18px; margin: 0; color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); font-size: 14px; }

.related { max-width: 1040px; margin: 40px auto 0; }
.related > h2 { font-size: 20px; }

.site-footer { margin-top: 64px; border-top: 1px solid var(--line); background: var(--surface); padding: 24px 0 40px; font-size: 14px; color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 8px; }
.footer-links a { color: var(--text); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }

/* --- 커버 그림: 카테고리 색(--hue) 그라데이션 + 선 아이콘. 사진이 있으면 사진 --- */
.cover {
  position: relative; overflow: hidden; display: grid; place-items: center;
  background:
    radial-gradient(circle at 85% 15%, hsl(var(--hue) 90% 75% / .55), transparent 45%),
    linear-gradient(135deg, hsl(var(--hue) 70% 52%), hsl(calc(var(--hue) + 35) 65% 40%));
  color: #fff;
}
.cover::after {
  content: ""; position: absolute; inset: 0; opacity: .14;
  background-image: radial-gradient(#fff 1.2px, transparent 1.2px); background-size: 16px 16px;
}
.cover.has-photo { background: var(--code); }
.cover.has-photo::after { display: none; }
.cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cover-icon { width: 34%; max-width: 120px; position: relative; z-index: 1; filter: drop-shadow(0 4px 12px rgb(0 0 0 / .18)); }
.cover-card { aspect-ratio: 16 / 9; margin: -20px -20px 4px; border-radius: var(--radius) var(--radius) 0 0; }
.cover-hero { aspect-ratio: 21 / 9; border-radius: var(--radius); }
.cover-hero .cover-icon { width: 22%; }
.post-cover { margin: 0 0 28px; }
.post-cover figcaption { font-size: 13px; color: var(--muted); margin-top: 6px; text-align: right; }

/* --- 그래프 (lib/visuals.mjs) --- */
:root { --v0: #1f5eff; --v1: #12a37f; --v2: #f08c00; --v3: #d6336c; --v4: #7048e8; --v5: #0c8599; --v-lo: #c9d1de; }
@media (prefers-color-scheme: dark) { :root { --v0: #6d97ff; --v1: #3dd6a8; --v2: #ffb84d; --v3: #f06595; --v4: #9775fa; --v5: #3bc9db; --v-lo: #3a4150; } }
.viz { margin: 28px 0; padding: 18px 18px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.viz svg { width: 100%; height: auto; display: block; overflow: visible; }
.viz-title { font-weight: 700; font-size: 16px; margin-bottom: 10px; }
.viz-title span { font-weight: 400; color: var(--muted); font-size: 13px; }
.viz-source { margin: 8px 0 0 !important; font-size: 12.5px; color: var(--muted); }
.viz text { font-family: inherit; }
.v-lab { fill: var(--muted); font-size: 14px; }
.v-val { fill: var(--text); font-size: 14px; font-weight: 700; }
.v-axis { stroke: var(--line); stroke-width: 1.5; }
.v-c0 { fill: var(--v0); color: var(--v0); } .v-c1 { fill: var(--v1); color: var(--v1); } .v-c2 { fill: var(--v2); color: var(--v2); }
.v-c3 { fill: var(--v3); color: var(--v3); } .v-c4 { fill: var(--v4); color: var(--v4); } .v-c5 { fill: var(--v5); color: var(--v5); }
.v-hi { fill: var(--v0); color: var(--v0); } .v-lo { fill: var(--v-lo); color: var(--v-lo); }
.v-line { fill: none; stroke: var(--v0); stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; }
.v-area { fill: var(--v0); opacity: .1; }
.v-dot { fill: var(--surface); stroke: var(--v0); stroke-width: 2.5; }
.v-dot-hi { fill: var(--v0); }
.v-seg { fill: none; stroke: currentColor; stroke-width: 34; }
.viz-donut { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.viz-donut svg { width: 180px; flex: none; }
.viz-legend { list-style: none; padding: 0 !important; margin: 0 !important; font-size: 15px; flex: 1; min-width: 200px; }
.viz-legend li { display: flex; align-items: center; gap: 8px; padding: 4px 0; }
.viz-legend i { width: 12px; height: 12px; border-radius: 3px; background: currentColor; flex: none; }
.viz-legend b { margin-left: auto; }
.viz-legend span { color: var(--muted); width: 3.2em; text-align: right; }

/* --- 단계 흐름도 --- */
.steps { list-style: none; padding: 0 !important; margin: 28px 0; display: grid; gap: 0; }
.steps li { display: flex; gap: 16px; position: relative; padding: 0 0 20px; margin: 0; }
.steps li:not(:last-child)::before { content: ""; position: absolute; left: 17px; top: 38px; bottom: 2px; width: 2px; background: var(--line); }
.step-n { flex: none; width: 36px; height: 36px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 15px; }
.steps strong { display: block; line-height: 36px; }
.steps p { margin: 0 !important; color: var(--muted); font-size: 15.5px; line-height: 1.6; }

/* --- 숫자 타일 --- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 28px 0; }
.stat { background: var(--accent-soft); border-radius: var(--radius); padding: 16px 18px; display: flex; flex-direction: column; gap: 2px; }
.stat b { font-size: 24px; line-height: 1.3; color: var(--accent); letter-spacing: -0.01em; }
.stat span { font-size: 14px; color: var(--muted); line-height: 1.5; }

/* --- 본문 사진 --- */
.photo { margin: 28px 0; }
.photo img { width: 100%; border-radius: var(--radius); display: block; }
.photo figcaption { font-size: 14px; color: var(--muted); margin-top: 8px; }
.photo figcaption span { font-size: 12.5px; opacity: .85; }