:root {
  --bg: #0b0d10;
  --bg-alt: #0f1318;
  --bg-card: #12171d;
  --border: #1f2630;
  --border-strong: #2a3441;
  --text: #e6edf3;
  --muted: #8b96a3;
  --accent: #7ee7c7;
  --accent-soft: rgba(126, 231, 199, 0.12);
  --merged: #a371f7;
  --open: #3fb950;
  --closed: #f85149;
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard",
    "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
}
.container.narrow { max-width: 720px; }

.muted { color: var(--muted); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 13, 16, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
}
.brand:hover { text-decoration: none; }
.brand-name { font-size: 15px; }
.brand-alt { font-size: 13px; color: var(--muted); }

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
}
.nav > a, .nav-group > a {
  color: var(--muted);
  font-size: 14px;
}
.nav > a:hover, .nav-group > a:hover { color: var(--text); text-decoration: none; }

/* Dropdown menus */
.nav-group { position: relative; }
.nav-group > a::after {
  content: " ▾";
  font-size: 10px;
  color: var(--muted);
}
.nav-group .dropdown {
  position: absolute;
  top: 100%;
  left: -8px;
  margin-top: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 6px;
  min-width: 220px;
  display: none;
  z-index: 20;
  box-shadow: 0 12px 28px rgba(0,0,0,0.45);
}
/* Invisible bridge that keeps the dropdown open while the cursor
   travels across the visual gap between the parent link and the menu. */
.nav-group .dropdown::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 0;
  right: 0;
  height: 10px;
}
/* Hover area extends below the parent link so the cursor never leaves
   .nav-group while moving down toward the dropdown. */
.nav-group > a {
  display: inline-block;
  padding: 8px 0;
}
.nav-group:hover .dropdown,
.nav-group:focus-within .dropdown,
.nav-group.open .dropdown { display: block; }
.nav-group .dropdown a {
  display: block;
  padding: 7px 10px;
  font-size: 13px;
  color: var(--text);
  border-radius: 5px;
  font-family: var(--mono);
}
.nav-group .dropdown a:hover { background: var(--bg-alt); color: var(--accent); text-decoration: none; }
.nav-group .dropdown .dropdown-section {
  padding: 6px 10px 2px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.lang-toggle {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  font-family: var(--mono);
  cursor: pointer;
}
.lang-toggle:hover { color: var(--text); border-color: var(--accent); }

@media (max-width: 640px) {
  .nav { gap: 12px; }
  .nav-group > a::after { display: none; }
  .nav-group .dropdown {
    left: auto;
    right: -8px;
    min-width: 240px;
  }
}

/* Hero */
.hero {
  padding: 96px 0 64px;
  border-bottom: 1px solid var(--border);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}
.title {
  margin: 0 0 20px;
  font-size: 27px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 700;
}
.lede {
  margin: 0 0 28px;
  max-width: 640px;
  font-size: 17px;
  color: #c3ccd6;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 8px 14px;
  color: var(--text);
  font-size: 14px;
  font-family: var(--mono);
}
.pill:hover { border-color: var(--accent); text-decoration: none; }
.pill-sub { color: var(--muted); }

/* Section */
.section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
}
.section-alt { background: var(--bg-alt); }
.section-header {
  margin-bottom: 36px;
}
.section-header h2 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: -0.01em;
}
.section-header p { margin: 0; max-width: 680px; }

/* Contribution groups */
.groups {
  display: grid;
  gap: 20px;
}
.group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 24px 18px;
}
.group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.group-head h3 {
  margin: 0;
  font-size: 19px;
  letter-spacing: -0.01em;
}
.badge {
  display: inline-block;
  font-size: 11px;
  font-family: var(--mono);
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 3px 10px;
}
.badge-merged {
  color: var(--merged);
  border-color: rgba(163, 113, 247, 0.5);
}
.group-desc {
  margin: 0 0 14px;
  color: #c3ccd6;
  font-size: 15px;
}

.pr-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}
.pr-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
}
.pr-list li:hover { border-color: var(--border-strong); }
.pr-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text);
  flex: 1 1 auto;
  min-width: 0;
}
.pr-list a:hover { text-decoration: none; }
.pr-id {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  flex: 0 0 auto;
}
.pr-title {
  font-size: 14px;
  color: #c3ccd6;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pr-list a:hover .pr-title { color: var(--text); }
.pr-state {
  font-size: 11px;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  flex: 0 0 auto;
}
.state-open { color: var(--open); border-color: rgba(63, 185, 80, 0.4); }
.state-merged { color: var(--merged); border-color: rgba(163, 113, 247, 0.5); }
.state-closed { color: var(--closed); border-color: rgba(248, 81, 73, 0.4); }

@media (max-width: 560px) {
  .pr-list a { flex-wrap: wrap; }
  .pr-title { white-space: normal; }
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}
.card:hover { border-color: var(--border-strong); }
.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.card p {
  margin: 0 0 14px;
  color: #c3ccd6;
  font-size: 14.5px;
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(126, 231, 199, 0.18);
  border-radius: 999px;
  padding: 2px 8px;
}

/* Contact */
.contact-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.contact-list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.contact-list .k {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  width: 70px;
  flex: 0 0 auto;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 13px;
}
.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Group/Card heading links */
.group-head h3 a, .card h3 a { color: var(--text); }
.group-head h3 a:hover, .card h3 a:hover { color: var(--accent); text-decoration: none; }

/* "Read more" link under groups/cards */
.group-more, .card-more {
  margin: 12px 0 0;
  font-family: var(--mono);
  font-size: 12px;
}
.group-more a, .card-more a { color: var(--accent); }

/* Breadcrumb (subpages) */
.breadcrumb {
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}
.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 14px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb li + li::before {
  content: "/";
  color: var(--border-strong);
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); text-decoration: none; }
.breadcrumb [aria-current="page"] { color: var(--text); }

/* Page hero (subpages) */
.page-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border);
}
.page-hero .title {
  margin: 0 0 16px;
  font-size: 26px;
  letter-spacing: -0.01em;
  font-weight: 700;
}
.page-hero .lede {
  margin: 0;
  max-width: 720px;
  font-size: 16px;
  line-height: 1.7;
  color: #c3ccd6;
}
.page-hero .hero-meta {
  margin-top: 22px;
}

/* Subpage body content */
.section h2 {
  margin: 36px 0 12px;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.section h2:first-child { margin-top: 0; }
.section p {
  margin: 0 0 14px;
  color: #c3ccd6;
  font-size: 15.5px;
  line-height: 1.75;
}
.section ul {
  margin: 0 0 18px;
  padding-left: 22px;
  color: #c3ccd6;
  font-size: 15px;
  line-height: 1.75;
}
.section ul li { margin: 4px 0; }
.section ul.contact-list,
.section ul.pr-list { padding-left: 0; list-style: none; }

/* Inline code */
code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--accent);
}

/* Code blocks */
pre {
  margin: 0 0 18px;
  padding: 16px 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: #c3ccd6;
}
pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
}