:root {
  color-scheme: light;
  --bg: #0f172a;
  --surface: #111827;
  --card: #0b1220;
  --ink: #e2e8f0;
  --muted: #94a3b8;
  --line: #1f2937;
  --accent: #14b8a6;
  --accent-dark: #0f766e;
  --highlight: #f59e0b;
  --shadow: 0 22px 40px rgba(2, 6, 23, 0.45);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  background: radial-gradient(circle at top, #111827 0%, #0b1120 60%);
  color: var(--ink);
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.masthead {
  background: rgba(15, 23, 42, 0.8);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.masthead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 44px;
  border-radius: 14px;
  background: var(--accent);
  color: #041c1a;
  font-weight: 700;
  letter-spacing: 0.6px;
}

.brand p {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.main-nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.main-nav a {
  padding: 6px 8px;
  border-radius: 8px;
  color: var(--muted);
}

.main-nav a[aria-current="page"] {
  background: rgba(20, 184, 166, 0.16);
  color: var(--accent);
  font-weight: 600;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  cursor: pointer;
  transition: 0.2s ease;
}

.btn.primary {
  background: var(--accent);
  color: #021313;
  border-color: var(--accent);
}

.btn.primary:hover {
  background: var(--accent-dark);
  color: #e6fffb;
}

.btn.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.hero {
  padding: 72px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  align-items: center;
}

.hero-sub {
  color: var(--muted);
  font-size: 16px;
  margin: 16px 0 24px;
}

.hero-slab {
  background: linear-gradient(135deg, rgba(20, 184, 166, 0.12), transparent);
  border: 1px solid var(--line);
  padding: 28px;
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.focus-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 24px;
  display: grid;
  gap: 12px;
}

.focus-list li {
  padding-left: 22px;
  position: relative;
  color: var(--muted);
}

.focus-list li::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.focus-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.focus-stats div {
  background: rgba(15, 118, 110, 0.18);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}

.focus-stats span {
  display: block;
  font-size: 12px;
  color: var(--muted);
}

.focus-stats strong {
  font-size: 16px;
}

.section {
  padding: 48px 0;
}

.section.deep {
  background: rgba(15, 23, 42, 0.8);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

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

.post-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.post-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  display: grid;
  gap: 12px;
  box-shadow: 0 12px 20px rgba(2, 6, 23, 0.5);
}

.post-card h3 {
  margin: 0;
}

.post-card p {
  margin: 0;
  color: var(--muted);
}

.post-card .tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(245, 158, 11, 0.18);
  color: var(--highlight);
}

.split-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.panel {
  background: var(--surface);
  border-radius: 16px;
  border: 1px solid var(--line);
  padding: 20px;
}

.list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  color: var(--muted);
}

.page {
  padding: 48px 0 72px;
}

.page-hero {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: center;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.timeline-item {
  background: var(--card);
  padding: 18px;
  border-radius: 14px;
  border: 1px dashed var(--line);
  text-align: center;
}

.timeline-item span {
  display: block;
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 6px;
}

.blog-layout {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr) 320px;
}

.post-list {
  display: grid;
  gap: 16px;
}

.post-row {
  background: var(--card);
  border-radius: 14px;
  border: 1px solid var(--line);
  padding: 18px;
  display: grid;
  gap: 10px;
}

.post-meta {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  gap: 12px;
}

.side-panel {
  display: grid;
  gap: 16px;
}

.admin-layout {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.admin-panel[aria-hidden="true"] {
  display: none;
}

.admin-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.form {
  display: grid;
  gap: 12px;
}

input,
textarea {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  padding: 10px 12px;
  font-family: inherit;
  font-size: 14px;
  background: #0b1220;
  color: var(--ink);
}

textarea {
  resize: vertical;
}

.admin-posts {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}

.admin-post {
  border: 1px solid var(--line);
  padding: 12px;
  border-radius: 12px;
  display: grid;
  gap: 8px;
  background: var(--card);
}

.admin-post-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 0;
  background: rgba(15, 23, 42, 0.9);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 14px;
}

@media (max-width: 900px) {
  .masthead-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .blog-layout {
    grid-template-columns: 1fr;
  }

  .main-nav {
    flex-wrap: wrap;
  }
}