:root {
  --bg: #0f1419;
  --bg-card: #161b22;
  --bg-card-hover: #1c2530;
  --border: #2a3340;
  --text: #e6edf3;
  --text-dim: #9aa7b5;
  --accent: #4f8cff;
  --accent-dim: #2d4a7c;
  --tag-bg: #1a2332;
  --maxw: 1080px;
  --radius: 8px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard", "Noto Sans KR", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

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

img { max-width: 100%; display: block; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

header.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}
.logo span { color: var(--accent); }

nav.main-nav { display: flex; gap: 4px; align-items: center; }
nav.main-nav a {
  color: var(--text-dim);
  font-size: 14.5px;
  padding: 8px 12px;
  border-radius: 6px;
  text-decoration: none;
}
nav.main-nav a:hover,
nav.main-nav a.active {
  color: var(--text);
  background: var(--bg-card);
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 14px;
  cursor: pointer;
}

/* Hero / page header */
.page-head {
  padding: 40px 0 28px;
  border-bottom: 1px solid var(--border);
}
.page-head h1 {
  font-size: 28px;
  margin: 0 0 8px;
  letter-spacing: -0.4px;
}
.page-head p {
  color: var(--text-dim);
  margin: 0;
  font-size: 15px;
}
.breadcrumb {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--accent); }

/* Main layout */
main { padding: 36px 0 60px; }

.section-title {
  font-size: 20px;
  margin: 0 0 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.section-title a.more {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-dim);
}

/* Category grid on home */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 44px;
}
.cat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
  transition: border-color .15s, background .15s;
}
.cat-card:hover { border-color: var(--accent-dim); background: var(--bg-card-hover); text-decoration: none; }
.cat-card .cat-icon { font-size: 22px; margin-bottom: 10px; }
.cat-card h3 { margin: 0 0 6px; font-size: 16px; color: var(--text); }
.cat-card p { margin: 0; font-size: 13px; color: var(--text-dim); }

/* Post list */
.post-list { display: flex; flex-direction: column; gap: 0; margin-bottom: 40px; }
.post-row {
  display: flex;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.post-row:first-child { padding-top: 0; }
.post-row .meta-col { width: 100px; flex-shrink: 0; }
.post-row .tag {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--accent);
  background: var(--tag-bg);
  border: 1px solid var(--accent-dim);
  padding: 3px 8px;
  border-radius: 4px;
}
.post-row .content-col h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
}
.post-row .content-col h3 a { color: var(--text); }
.post-row .content-col h3 a:hover { color: var(--accent); }
.post-row .content-col p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--text-dim);
}
.post-row .date {
  font-size: 12.5px;
  color: var(--text-dim);
}

/* Post detail */
article.post {
  max-width: 760px;
  margin: 0 auto;
}
article.post .post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 14px;
}
article.post h1 {
  font-size: 30px;
  line-height: 1.35;
  margin: 0 0 18px;
  letter-spacing: -0.4px;
}
article.post .lead {
  font-size: 16.5px;
  color: var(--text-dim);
  border-left: 3px solid var(--accent);
  padding-left: 14px;
  margin: 0 0 30px;
}
article.post h2 {
  font-size: 21px;
  margin: 38px 0 14px;
  padding-top: 4px;
  letter-spacing: -0.3px;
}
article.post h3 {
  font-size: 17.5px;
  margin: 26px 0 10px;
}
article.post p { margin: 0 0 16px; color: #d6dde5; }
article.post ul, article.post ol { margin: 0 0 16px; padding-left: 22px; color: #d6dde5; }
article.post li { margin-bottom: 6px; }
article.post code {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13.5px;
  font-family: "SF Mono", Consolas, Monaco, monospace;
  color: #ffb86b;
}
article.post pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0 0 20px;
}
article.post pre code {
  background: none;
  border: none;
  padding: 0;
  color: #c9d1d9;
}
article.post table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 22px;
  font-size: 14px;
}
article.post th, article.post td {
  border: 1px solid var(--border);
  padding: 9px 12px;
  text-align: left;
}
article.post th { background: var(--bg-card); color: var(--text); }
article.post td { color: var(--text-dim); }
article.post blockquote {
  margin: 0 0 18px;
  padding: 12px 16px;
  background: var(--bg-card);
  border-left: 3px solid var(--accent-dim);
  border-radius: 0 6px 6px 0;
  color: var(--text-dim);
  font-size: 14.5px;
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 44px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.post-nav a {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--text-dim);
  font-size: 13px;
}
.post-nav a:hover { border-color: var(--accent-dim); text-decoration: none; }
.post-nav a span { display: block; color: var(--text); font-size: 14.5px; margin-top: 4px; }
.post-nav a.next { text-align: right; }

/* Static page content (about/contact/privacy/disclaimer) */
.static-page {
  max-width: 760px;
  margin: 0 auto;
}
.static-page h2 { font-size: 19px; margin: 30px 0 12px; }
.static-page p { margin: 0 0 14px; color: #d6dde5; }
.static-page ul { margin: 0 0 14px; padding-left: 20px; color: #d6dde5; }
.static-page li { margin-bottom: 6px; }
.static-page table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.static-page th, .static-page td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.static-page th { background: var(--bg-card); }
.static-page td { color: var(--text-dim); }

/* Contact form */
.contact-form { max-width: 480px; }
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 13.5px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 14.5px;
  font-family: inherit;
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 11px 22px;
  border-radius: 6px;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { background: #3d7ae0; text-decoration: none; }
.form-note {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 14px;
}
#form-status { font-size: 13.5px; margin-top: 10px; display: none; }

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
  margin-top: 20px;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 22px;
}
.footer-col h4 {
  font-size: 13.5px;
  color: var(--text);
  margin: 0 0 12px;
}
.footer-col a {
  display: block;
  color: var(--text-dim);
  font-size: 13.5px;
  margin-bottom: 8px;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 18px;
  font-size: 12.5px;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* Responsive */
@media (max-width: 760px) {
  nav.main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 14px 14px;
    display: none;
  }
  nav.main-nav.open { display: flex; }
  nav.main-nav a { padding: 12px 8px; border-radius: 4px; }
  .menu-toggle { display: inline-block; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .post-row { flex-direction: column; gap: 8px; }
  .post-row .meta-col { width: auto; }
  article.post h1 { font-size: 24px; }
  .post-nav { flex-direction: column; }
  .post-nav a.next { text-align: left; }
  .footer-grid { gap: 28px 40px; }
}