/* Bosugo Info – Premium Design System */
/* 8pt grid · Pretendard + Noto Serif KR · WCAG AA */

:root {
  --color-primary: #1e40af;
  --color-primary-light: #3b82f6;
  --color-primary-dark: #1e3a8a;
  --color-accent: #f59e0b;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-border: #e2e8f0;
  --color-success: #059669;
  --font-sans: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif KR', Georgia, 'Times New Roman', serif;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.12);
  --transition: .25s cubic-bezier(.4,0,.2,1);
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}
h1 { font-size: 2rem; letter-spacing: -.02em; }
h2 { font-size: 1.5rem; letter-spacing: -.01em; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
p { margin: 0 0 var(--space-md); }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-light); }
a:focus-visible { outline: 2px solid var(--color-primary-light); outline-offset: 2px; border-radius: 2px; }

/* Layout */
.site-container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-lg); }
.content-area { max-width: 780px; margin: 0 auto; padding: var(--space-2xl) 0; }
.archive-shell { padding-top:80px; padding-bottom:112px; }
.archive-header { max-width:760px; margin-bottom:48px; }
.archive-header h1 { font-size:clamp(2rem,5vw,3.5rem); margin:8px 0 16px; }
.pagination { margin-top:48px; }
.legal-page { min-height:50vh; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}
.site-logo { display: flex; align-items: center; gap: var(--space-sm); }
.site-logo img { height: 36px; width: 36px; border-radius: 10px; image-rendering: auto; }
.site-logo span {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
}

/* Navigation */
.main-nav { display: flex; align-items: center; gap: var(--space-xs); }
.main-nav a {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: .925rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
  background: rgba(30,64,175,.06);
}
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-sm);
  cursor: pointer;
  color: var(--color-text);
}
.mobile-menu-toggle svg { width: 24px; height: 24px; }

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .main-nav a { width: 100%; padding: var(--space-md); }
  .mobile-menu-toggle { display: block; }
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  padding: var(--space-3xl) var(--space-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::after { content:''; position:absolute; inset:0; background:linear-gradient(90deg,rgba(15,23,42,.94) 0%,rgba(30,58,138,.82) 48%,rgba(30,64,175,.28) 100%),var(--hero-image) center/cover no-repeat; }
.hero-inner { position:relative; z-index:1; text-align:left; min-height:440px; display:flex; flex-direction:column; justify-content:center; align-items:flex-start; }
.hero-kicker { margin:0 0 var(--space-md)!important; font-size:.82rem!important; font-weight:700; letter-spacing:.08em; color:#fde68a; }
.hero-actions { display:flex; gap:var(--space-md); flex-wrap:wrap; }
.hero .btn-secondary { display:inline-flex; align-items:center; min-height:52px; padding:0 var(--space-xl); border:1px solid rgba(255,255,255,.55); border-radius:var(--radius-md); color:#fff; font-weight:600; }
.hero .btn-secondary:hover { background:rgba(255,255,255,.12); color:#fff; }
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,.08) 0%, transparent 70%);
  border-radius: 50%; z-index: 2; pointer-events:none;
}
.hero h1 {
  font-size: clamp(2.5rem,6vw,4.75rem);
  color: #fff;
  margin: 0 0 var(--space-md);
  position: relative; max-width:820px; letter-spacing:-.045em;
}
.hero p {
  font-size: 1.1rem;
  opacity: .9;
  max-width: 640px;
  margin: 0 0 var(--space-xl);
  position: relative;
}
.site-legal { max-width:980px; margin:24px auto 0; padding:16px; border-top:1px solid rgba(148,163,184,.3); font-size:.75rem; line-height:1.65; color:#94a3b8; text-align:left; }
.site-legal p { margin:3px 0; }
.process-strip { display:grid; grid-template-columns:repeat(4,1fr); gap:8px; margin:32px 0; counter-reset:step; }
.process-strip span { counter-increment:step; min-height:76px; display:flex; align-items:center; justify-content:center; padding:12px; border:1px solid var(--color-border); border-radius:var(--radius-sm); background:var(--color-surface); color:var(--color-primary-dark); font-weight:700; text-align:center; }
.process-strip span::before { content:counter(step); display:inline-grid; place-items:center; width:24px; height:24px; margin-right:8px; border-radius:50%; background:var(--color-primary); color:#fff; font-size:.75rem; }
.entry-content .table-wrap { overflow-x:auto; margin:32px 0; border:1px solid var(--color-border); border-radius:var(--radius-md); }
.entry-content table { width:100%; min-width:560px; border-collapse:collapse; margin:0; }
.entry-content caption { padding:16px; text-align:left; font-weight:700; background:var(--color-surface); }
.entry-content th,.entry-content td { padding:14px 16px; border-top:1px solid var(--color-border); text-align:left; vertical-align:top; }
.entry-content th { color:var(--color-primary-dark); background:#f8fafc; }
.hero .btn-cta {
  display: inline-block;
  background: var(--color-accent);
  color: #1a1a1a;
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: all var(--transition);
  position: relative;
}
.hero .btn-cta:hover { background: #fbbf24; transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* Cards */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card-image { aspect-ratio: 16/10; overflow: hidden; }
.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.card:hover .card-image img { transform: scale(1.04); }
.card-body { padding: var(--space-lg); }
.card-category {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}
.card-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 var(--space-sm);
  color: var(--color-text);
}
.card-title a { color: inherit; }
.card-title a:hover { color: var(--color-primary); }
.card-excerpt {
  font-size: .9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: .82rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

/* Card Grid */
.card-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}
@media (max-width: 768px) {
  .card-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
}
@media (max-width: 768px) { .hero-inner { min-height:380px; } .hero { padding:48px 8px; } .hero h1 { font-size:2.55rem; } .content-area { padding-left:20px; padding-right:20px; } .process-strip { grid-template-columns:1fr 1fr; } }

/* Featured Post Carousel */
.featured-section { padding: var(--space-2xl) 0; }
.featured-section .section-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 var(--space-xl);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.featured-section .section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
  margin-left: var(--space-md);
}
.featured-carousel {
  display: flex;
  gap: var(--space-lg);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--space-md);
  scrollbar-width: none;
}
.featured-carousel::-webkit-scrollbar { display: none; }
.featured-carousel .card {
  flex: 0 0 340px;
  scroll-snap-align: start;
}
@media (max-width: 768px) {
  .featured-carousel .card { flex: 0 0 85vw; }
}

/* Single Post */
.entry-header { margin-bottom: var(--space-2xl); }
.entry-category {
  display: inline-block;
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--color-primary);
  background: rgba(30,64,175,.06);
  padding: var(--space-xs) var(--space-md);
  border-radius: 99px;
  margin-bottom: var(--space-md);
}
.entry-title {
  font-size: 2rem;
  margin: 0 0 var(--space-md);
}
.entry-meta {
  font-size: .88rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.entry-content {
  font-size: 1rem;
  line-height: 1.85;
}
.entry-content h2 {
  font-size: 1.4rem;
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}
.entry-content h2:first-of-type { border-top: none; padding-top: 0; }
.entry-content h3 { font-size: 1.15rem; margin-top: var(--space-xl); }
.entry-content ul, .entry-content ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
}
.entry-content li { margin-bottom: var(--space-sm); }
.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: .94rem;
}
.entry-content th {
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-md);
  text-align: left;
  font-weight: 600;
}
.entry-content td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}
.entry-content tr:nth-child(even) { background: var(--color-surface); }
.entry-content blockquote {
  margin: var(--space-lg) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-accent);
  background: #fffbeb;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .95rem;
}
.entry-content blockquote p:last-child { margin-bottom: 0; }
.entry-content figure { margin: var(--space-xl) 0; }
.entry-content figure img {
  width: 100%;
  max-width: 800px;
  display: block;
  margin: 0 auto;
  border-radius: var(--radius-md);
}
.entry-content figcaption {
  text-align: center;
  font-size: .85rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
}

/* Post Summary Box */
.post-summary {
  background: linear-gradient(135deg, #f0f7ff, #e8f4f8);
  border-radius: var(--radius-md);
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-2xl);
  border-left: 4px solid var(--color-primary);
  font-size: .95rem;
  line-height: 1.7;
}

/* Legal/AI Notices */
.legal-notice {
  font-size: .85rem;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border-left: 3px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  margin-top: var(--space-2xl);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.legal-notice p { margin: var(--space-xs) 0; }
.ai-notice {
  font-size: .85rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-2xl);
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: var(--space-2xl) var(--space-lg);
  margin-top: var(--space-3xl);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xl);
  justify-content: space-between;
}
.footer-section h4 {
  font-family: var(--font-sans);
  font-size: .88rem;
  font-weight: 600;
  color: #e2e8f0;
  text-transform: uppercase;
  letter-spacing: .04em;
  margin: 0 0 var(--space-md);
}
.footer-section ul { list-style: none; padding: 0; margin: 0; }
.footer-section li { margin-bottom: var(--space-sm); }
.footer-section a { color: #94a3b8; font-size: .88rem; }
.footer-section a:hover { color: #e2e8f0; }
.footer-bottom {
  max-width: 1200px;
  margin: var(--space-xl) auto 0;
  padding-top: var(--space-xl);
  border-top: 1px solid #1e293b;
  font-size: .82rem;
  text-align: center;
  color: #64748b;
}
.footer-bottom p { margin: var(--space-xs) 0; }

/* Breadcrumb */
.breadcrumb {
  font-size: .85rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { margin: 0 var(--space-sm); }

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-2xl) 0;
}
.pagination a, .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}
.pagination a:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.pagination .current {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Category Filter */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}
.category-filter a {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 99px;
  font-size: .85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}
.category-filter a:hover,
.category-filter a.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Search */
.search-form {
  display: flex;
  max-width: 480px;
  margin: 0 auto;
}
.search-form input[type="search"] {
  flex: 1;
  padding: var(--space-md);
  border: 2px solid var(--color-border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  font-size: .95rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition);
}
.search-form input[type="search"]:focus { border-color: var(--color-primary); }
.search-form button {
  padding: var(--space-md) var(--space-lg);
  background: var(--color-primary);
  color: #fff;
  border: 2px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.search-form button:hover { background: var(--color-primary-light); border-color: var(--color-primary-light); }

/* Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}
.text-center { text-align: center; }

/* Responsive */
@media (max-width: 480px) {
  .hero { padding: var(--space-2xl) var(--space-md); }
  .hero h1 { font-size: 1.7rem; }
  .entry-title { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }
  .footer-inner { flex-direction: column; gap: var(--space-xl); }
}