:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --surface: #f8fafc;
  --ink: #111827;
  --muted: #64748b;
  --line: #e2e8f0;
  --card: #ffffff;
  --soft-blue: #eff6ff;
  --soft-green: #ecfdf5;
  --soft-amber: #fffbeb;
  --radius: 8px;
  --shadow: 0 14px 40px rgba(15, 23, 42, 0.08);
  --content: 1120px;
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
}

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

img,
svg {
  max-width: 100%;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 50;
  padding: 10px 14px;
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.header-inner,
.container {
  width: min(var(--content), calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 900;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: #334155;
  font-size: 15px;
}

.nav a:hover,
.footer a:hover,
.text-link:hover {
  color: var(--primary);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 38px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(14, 165, 233, 0.06)),
    var(--surface);
  border-bottom: 1px solid var(--line);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: 45%;
  height: 100%;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(90deg, transparent, #000);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin: 18px 0 16px;
  font-size: clamp(34px, 5vw, 56px);
}

h2 {
  margin: 0 0 12px;
  font-size: 28px;
}

h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

p {
  margin: 0 0 14px;
}

.lead {
  max-width: 680px;
  color: #334155;
  font-size: 18px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 14px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.btn:hover {
  background: var(--primary-dark);
}

.btn.secondary {
  background: #fff;
  color: var(--primary);
  border-color: #bfdbfe;
}

.btn.secondary:hover {
  background: var(--soft-blue);
}

.btn.ghost {
  background: transparent;
  color: #334155;
  border-color: var(--line);
}

.btn.danger {
  background: #dc2626;
}

.visual-panel {
  position: relative;
  padding: 22px;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.visual-row {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.visual-row:last-child {
  border-bottom: 0;
}

.visual-icon,
.category-icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--soft-blue);
  color: var(--primary);
  font-weight: 900;
}

.section {
  padding: 54px 0;
}

.section.alt {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.section-head p {
  max-width: 660px;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  padding: 20px;
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

a.card:hover,
.post-card:hover {
  transform: translateY(-2px);
  border-color: #bfdbfe;
  box-shadow: var(--shadow);
}

.post-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  color: var(--muted);
  font-size: 13px;
}

.badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 26px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--soft-blue);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.summary {
  color: #475569;
}

.card-footer {
  margin-top: auto;
  padding-top: 16px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 24px 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: #334155;
}

.page-hero {
  padding: 36px 0 30px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  margin-top: 0;
  font-size: clamp(30px, 4vw, 44px);
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 34px;
  align-items: start;
}

.article {
  max-width: 760px;
}

.article-body {
  font-size: 17px;
}

.article-body h2 {
  margin-top: 38px;
  padding-top: 8px;
}

.article-body ul,
.article-body ol {
  padding-left: 22px;
}

.info-box {
  margin: 26px 0;
  padding: 18px;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  background: var(--soft-blue);
}

.warn-box {
  margin: 26px 0;
  padding: 18px;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  background: var(--soft-amber);
}

.toc {
  position: sticky;
  top: 92px;
}

.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: #475569;
  font-size: 14px;
}

.author-box {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 14px;
  margin-top: 32px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.avatar {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
}

.footer {
  padding: 36px 0;
  border-top: 1px solid var(--line);
  background: #0f172a;
  color: #cbd5e1;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(140px, 1fr));
  gap: 24px;
}

.footer h2,
.footer h3 {
  color: #fff;
  font-size: 16px;
}

.footer a {
  display: block;
  margin: 6px 0;
  color: #cbd5e1;
}

.legal-page {
  max-width: 820px;
}

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

label {
  display: grid;
  gap: 6px;
  color: #334155;
  font-weight: 700;
}

input,
textarea,
select {
  width: 100%;
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.notice {
  padding: 14px;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  background: var(--soft-amber);
  color: #92400e;
}

.admin-shell {
  min-height: calc(100vh - 72px);
  background: #f1f5f9;
}

.admin-login {
  max-width: 480px;
  margin: 50px auto;
}

.admin-app {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  min-height: calc(100vh - 72px);
}

.admin-sidebar {
  padding: 18px;
  border-right: 1px solid #cbd5e1;
  background: #111827;
  color: #e5e7eb;
}

.admin-sidebar button,
.admin-sidebar a {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  margin: 4px 0;
  padding: 10px 12px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #e5e7eb;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.admin-sidebar button.active,
.admin-sidebar button:hover,
.admin-sidebar a:hover {
  background: #1f2937;
}

.admin-main {
  padding: 24px;
  overflow-x: auto;
}

.admin-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stat {
  padding: 18px;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius);
  background: #fff;
}

.stat strong {
  display: block;
  font-size: 30px;
}

.table-list {
  display: grid;
  gap: 10px;
}

.table-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 14px;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius);
  background: #fff;
}

.admin-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.admin-form .full {
  grid-column: 1 / -1;
}

.preview-panel {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius);
  background: #fff;
}

.hidden {
  display: none !important;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .hero-grid,
  .content-layout,
  .footer-grid,
  .admin-app {
    grid-template-columns: 1fr;
  }

  .grid.cols-2,
  .grid.cols-3,
  .grid.cols-4,
  .stat-grid,
  .admin-form {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

  .section-head,
  .admin-top {
    align-items: start;
    flex-direction: column;
  }

  .admin-sidebar {
    border-right: 0;
  }
}

@media (max-width: 560px) {
  .header-inner,
  .container {
    width: min(var(--content), calc(100% - 24px));
  }

  .hero {
    padding-top: 44px;
  }

  .visual-panel {
    padding: 16px;
  }

  .table-item {
    grid-template-columns: 1fr;
  }
}