/* productplan — Medium/Brunch inspired reading layout */
:root {
  --bg: #fffdf9;
  --text: #191919;
  --muted: #6b6b6b;
  --border: #ece7df;
  --accent: #1a8917;
  --max: 720px;
  --font: "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  --serif: "Georgia", "Batang", serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

.site-header {
  max-width: calc(var(--max) + 48px);
  margin: 0 auto;
  padding: 28px 24px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.brand { font-size: 15px; font-weight: 700; letter-spacing: -0.02em; }
.brand span { color: var(--muted); font-weight: 400; }

.nav a { font-size: 14px; color: var(--muted); margin-left: 16px; }

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.article-list {
  max-width: var(--max);
  margin: 0 auto;
  padding: 8px 24px 64px;
}

.post-card {
  display: block;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.post-card h2 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.post-card .excerpt {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.post-card .meta {
  font-size: 13px;
  color: var(--muted);
}

.article-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.article-header h1 {
  margin: 0 0 16px;
  font-size: 38px;
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-family: var(--serif);
  font-weight: 700;
}

.article-header .meta {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.article-body {
  font-size: 18px;
  line-height: 1.85;
  letter-spacing: -0.01em;
}

.article-body p { margin: 0 0 1.4em; }

.article-body h2 {
  margin: 2em 0 0.8em;
  font-size: 24px;
  line-height: 1.35;
}

.article-body blockquote {
  margin: 1.5em 0;
  padding-left: 20px;
  border-left: 3px solid var(--border);
  color: var(--muted);
  font-style: italic;
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--muted);
}

.engagement {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 24px 48px;
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

@media (max-width: 600px) {
  .hero h1 { font-size: 28px; }
  .article-header h1 { font-size: 30px; }
  .article-body { font-size: 17px; }
}