@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css");

:root {
  --blue: #3182f6;
  --blue-strong: #1b64da;
  --blue-soft: #e8f3ff;
  --blue-softer: #f4f9ff;
  --text: #191f28;
  --text-2: #333d4b;
  --text-3: #4e5968;
  --muted: #8b95a1;
  --line: #e5e8eb;
  --fill: #f2f4f6;
  --fill-2: #f9fafb;
  --bg: #ffffff;
  --radius: 20px;
  --max: 760px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  word-break: keep-all;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-strong); }
::selection { background: var(--blue-soft); }

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

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgba(229, 232, 235, 0.7);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.logo {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 800; font-size: 18px; color: var(--text); letter-spacing: -0.03em;
}
.logo:hover { color: var(--text); }
.logo-mark {
  width: 26px; height: 26px; border-radius: 8px;
  background: var(--blue); color: #fff;
  display: grid; place-items: center;
  font-size: 13px; font-weight: 800; letter-spacing: 0;
}
.nav { display: flex; gap: 4px; font-size: 15px; font-weight: 600; }
.nav a { color: var(--text-3); padding: 7px 12px; border-radius: 10px; transition: background .15s, color .15s; }
.nav a:hover { background: var(--fill); color: var(--text); }
.nav a[aria-current="page"] { color: var(--blue); }

/* Hero */
.hero { padding: 72px 0 40px; }
.eyebrow {
  display: inline-block; font-size: 14px; font-weight: 700; color: var(--blue);
  background: var(--blue-soft); padding: 6px 12px; border-radius: 999px; margin-bottom: 20px;
}
.hero h1 { font-size: 44px; line-height: 1.3; margin: 0 0 16px; font-weight: 800; letter-spacing: -0.04em; }
.hero h1 em { font-style: normal; color: var(--blue); }
.hero p { color: var(--text-3); margin: 0; font-size: 18px; }

/* Filters */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0 16px; }
.filters button {
  font: inherit; font-size: 15px; font-weight: 600; cursor: pointer;
  padding: 9px 18px; border-radius: 999px; border: 0;
  background: var(--fill); color: var(--text-3);
  transition: background .15s, color .15s, transform .1s;
}
.filters button:hover { background: #e5e8eb; }
.filters button:active { transform: scale(0.97); }
.filters button[aria-pressed="true"] { background: var(--blue); color: #fff; }

/* Post list */
.post-list { list-style: none; margin: 0 -20px; padding: 0; }
.post-list a.card {
  position: relative;
  display: block; padding: 24px 120px 24px 20px; border-radius: var(--radius); color: inherit;
  transition: background .15s, transform .1s;
}
.post-list a.card:hover { background: var(--fill-2); color: inherit; }
.post-list a.card:active { transform: scale(0.99); background: var(--fill); }
.post-list h2 { font-size: 21px; line-height: 1.45; margin: 10px 0 6px; font-weight: 700; letter-spacing: -0.03em; }
.post-list p { margin: 0; color: var(--text-3); font-size: 16px; }
.post-list .arrow {
  position: absolute; right: 20px; top: 50%;
  color: var(--blue); font-weight: 700; font-size: 15px;
  opacity: 0; transform: translate(-4px, -50%); transition: opacity .15s, transform .15s;
}
.post-list a.card:hover .arrow { opacity: 1; transform: translate(0, -50%); }

.meta { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); font-weight: 500; }
.tag {
  display: inline-block; font-size: 13px; font-weight: 700;
  padding: 3px 10px; border-radius: 8px;
  background: var(--blue-soft); color: var(--blue);
}
.tag.tip { background: var(--fill); color: var(--text-3); }

/* Subscribe card */
.subscribe {
  margin: 48px 0 0; padding: 28px; border-radius: 24px;
  background: var(--blue-softer); border: 1px solid var(--blue-soft);
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.subscribe strong { display: block; font-size: 19px; letter-spacing: -0.03em; }
.subscribe span { color: var(--text-3); font-size: 15px; }
.btn {
  display: inline-block; font-weight: 700; font-size: 16px;
  background: var(--blue); color: #fff; padding: 12px 22px; border-radius: 14px;
  transition: background .15s, transform .1s;
}
.btn:hover { background: var(--blue-strong); color: #fff; }
.btn:active { transform: scale(0.97); }

/* Article */
.article { padding: 56px 0 24px; }
.article h1 { font-size: 36px; line-height: 1.35; margin: 16px 0 12px; font-weight: 800; letter-spacing: -0.04em; }
.article .lead { color: var(--text-3); font-size: 19px; margin: 0 0 40px; padding-bottom: 40px; border-bottom: 1px solid var(--line); }
.prose { color: var(--text-2); font-size: 17px; line-height: 1.85; }
.prose h2 { color: var(--text); font-size: 24px; line-height: 1.4; margin: 56px 0 14px; font-weight: 700; letter-spacing: -0.03em; }
.prose h3 { color: var(--text); font-size: 19px; margin: 36px 0 8px; font-weight: 700; }
.prose p, .prose ul, .prose ol { margin: 0 0 20px; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--blue); }
.prose strong { color: var(--text); }
.prose blockquote {
  margin: 28px 0; padding: 18px 22px; border-radius: 16px;
  background: var(--fill-2); color: var(--text-3); border: 0;
}
.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.88em;
  background: var(--fill); color: var(--text-2); padding: 2px 7px; border-radius: 6px;
}
.prose pre {
  background: var(--fill); padding: 18px 22px; border-radius: 16px;
  overflow-x: auto; line-height: 1.7; margin: 0 0 20px;
  font-family: inherit; white-space: pre-wrap;
}
.prose pre code { background: none; padding: 0; font-family: inherit; font-size: 15px; color: var(--text-2); }
.callout {
  background: var(--blue-soft); border-radius: 20px; padding: 22px 24px; margin: 32px 0;
  color: var(--text-2);
}
.callout strong { color: var(--blue); display: block; margin-bottom: 6px; font-size: 16px; }
.back {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 40px;
  font-size: 15px; font-weight: 700; padding: 12px 18px; border-radius: 14px;
  background: var(--fill); color: var(--text-3);
}
.back:hover { background: #e5e8eb; color: var(--text); }

/* Footer */
.site-footer { background: var(--fill-2); margin-top: 80px; padding: 36px 0 48px; color: var(--muted); font-size: 14px; }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer a { color: var(--text-3); font-weight: 600; }

@media (max-width: 600px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .hero { padding: 48px 0 28px; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 16px; }
  .article { padding: 40px 0 16px; }
  .article h1 { font-size: 27px; }
  .article .lead { font-size: 17px; }
  .post-list { margin: 0 -12px; }
  .post-list a.card { padding: 20px 12px; }
  .post-list .arrow { display: none; }
  .post-list h2 { font-size: 19px; }
  .nav a { padding: 7px 8px; }
  .subscribe { padding: 22px; }
}