/* ============================================================
   Insight Bank Hub — Design System
   "6개 매체 통합 지식 뱅크 + GEO-AIO 싱크탱크"
   Premium White · Heritage Gold · Glass Morphism · Mobile-First
   Font: KoPubWorld Dotum (한국출판인회의)
   ============================================================ */

/* ---------- 0. KoPubWorld Dotum @font-face ---------- */
/* 1순위: 로컬 설치 폰트 / 2순위: jsDelivr CDN / 3순위: 시스템 sans-serif */
@font-face {
  font-family: 'KoPubWorld Dotum';
  font-weight: 300;
  font-style: normal;
  font-display: swap;
  src: local('KoPubWorld Dotum Light'),
       local('KoPubWorldDotum-Light'),
       local('KoPubWorldDotumLight'),
       url('https://cdn.jsdelivr.net/gh/webfontworld/kopub@1.0/KoPubWorld_Dotum_Light.woff2') format('woff2');
}
@font-face {
  font-family: 'KoPubWorld Dotum';
  font-weight: 500;
  font-style: normal;
  font-display: swap;
  src: local('KoPubWorld Dotum Medium'),
       local('KoPubWorldDotum-Medium'),
       local('KoPubWorldDotumMedium'),
       url('https://cdn.jsdelivr.net/gh/webfontworld/kopub@1.0/KoPubWorld_Dotum_Medium.woff2') format('woff2');
}
@font-face {
  font-family: 'KoPubWorld Dotum';
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  src: local('KoPubWorld Dotum Bold'),
       local('KoPubWorldDotum-Bold'),
       local('KoPubWorldDotumBold'),
       url('https://cdn.jsdelivr.net/gh/webfontworld/kopub@1.0/KoPubWorld_Dotum_Bold.woff2') format('woff2');
}
@font-face {
  font-family: 'KoPubWorld Dotum';
  font-weight: 900;
  font-style: normal;
  font-display: swap;
  src: local('KoPubWorld Dotum Bold'),
       url('https://cdn.jsdelivr.net/gh/webfontworld/kopub@1.0/KoPubWorld_Dotum_Bold.woff2') format('woff2');
}

/* ---------- 1. 색상 토큰 — White Premium ---------- */
:root {
  /* Background — Heritage Cream / Pure White Series */
  --bg-base:   #fafaf6;   /* off-white, heritage paper */
  --bg-elev-1: #f4f1e8;   /* soft warm cream (section alt) */
  --bg-elev-2: #ede8d9;   /* deeper beige (cards solid) */
  --bg-elev-3: #ffffff;   /* pure white (menu/dropdown) */
  --bg-elev-4: #fbf6ec;   /* gold-tinged cream (featured) */

  /* Brand — Heritage Gold (값을 깊게: 흰 배경 위 가독성) */
  --gold-50:  #fbf6ec;
  --gold-100: #f3e6cc;
  --gold-300: #8a6135;   /* 본문 텍스트용 deep gold (white bg AA+) */
  --gold-500: #b8864e;   /* primary 버튼 그라디언트 시작 */
  --gold-600: #8a6135;   /* primary 버튼 그라디언트 끝 */
  --gold-700: #6e4a25;   /* 가장 진한 골드 */

  /* Accent — Insight Blue (AI/디지털, white bg 가독성 우선) */
  --blue-300: #2c6fc2;   /* 본문 텍스트용 deep blue */
  --blue-500: #1d4f93;
  --blue-600: #143869;
  --blue-700: #0e264a;

  /* Accent — Royal Purple (Phase 2.5 · Stream 09 · 월간지방세연구) */
  --purple-300: #7e22ce;
  --purple-500: #6b1ab0;
  --purple-700: #4a1380;

  /* Semantic — white bg 가독성 보정 */
  --success: #15803d;
  --warning: #b45309;
  --danger:  #b91c1c;
  --info:    #1d4f93;

  /* Text — 가독성 최적화 (화이트 배경 #fafaf6 기준)
     · primary   #1a1a1f  → 명도비 16.0 : 1  (AAA · 본문 강조)
     · secondary #3a3a45  → 명도비 11.5 : 1  (AAA · 본문)
     · muted     #6a6a78  → 명도비  5.8 : 1  (AA  · 보조 라벨)
     · faint     #9a9aa8  → 명도비  3.2 : 1  (Large text only)
  */
  --text-primary:   #1a1a1f;
  --text-secondary: #3a3a45;
  --text-muted:     #6a6a78;
  --text-faint:     #9a9aa8;
  --text-on-gold:   #1a1208;   /* 골드 버튼 위 텍스트 (변경 없음) */

  /* Border / Divider — 흑색 톤 (반전) */
  --border-subtle:  rgba(0,0,0,0.06);
  --border-default: rgba(0,0,0,0.10);
  --border-strong:  rgba(0,0,0,0.18);
  --border-gold:    rgba(138,97,53,0.35);
  --border-purple:  rgba(126,34,206,0.30);

  /* Glass — White bg 위 subtle dark wash (반전) */
  --glass-50:  rgba(0,0,0,0.015);
  --glass-100: rgba(0,0,0,0.03);
  --glass-200: rgba(0,0,0,0.05);
  --glass-300: rgba(0,0,0,0.08);
  --glass-400: rgba(0,0,0,0.12);
  --glass-gold:   rgba(212,165,116,0.14);
  --glass-blue:   rgba(74,144,226,0.10);
  --glass-purple: rgba(192,132,252,0.10);
  --glass-purple-soft: rgba(192,132,252,0.06);
  --glass-purple-strong: rgba(192,132,252,0.18);

  /* Shadow — 화이트 테마용 부드러운 그림자 */
  --shadow-sm: 0 2px 6px rgba(0,0,0,0.05);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
  --shadow-gold: 0 8px 32px rgba(138,97,53,0.18);

  /* Radius */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-full: 999px;

  /* Spacing scale */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;

  /* Type scale */
  --fs-xs: 13px;
  --fs-sm: 15px;
  --fs-base: 17px;
  --fs-md: 19px;
  --fs-lg: 23px;
  --fs-xl: 29px;
  --fs-2xl: 37px;
  --fs-3xl: 49px;
  --fs-4xl: 65px;
  --fs-display: 85px;

  /* Layout */
  --container: 1240px;
  --header-h: 72px;

  /* Easing */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ---------- 2. Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'KoPubWorld Dotum', 'Pretendard', -apple-system, BlinkMacSystemFont,
               'Apple SD Gothic Neo', 'Noto Sans KR', system-ui, sans-serif;
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--bg-base);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(212,165,116,0.10), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 110%, rgba(212,165,116,0.07), transparent 60%),
    radial-gradient(ellipse 50% 35% at 5% 60%, rgba(74,144,226,0.04), transparent 60%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
input, textarea, select, button { font-family: inherit; color: inherit; }

::selection { background: var(--gold-500); color: var(--text-on-gold); }

/* ---------- 3. Typography ---------- */
.display, .h-display {
  font-family: 'KoPubWorld Dotum', 'Pretendard', 'Noto Sans KR', system-ui, sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h1, h2, h3, h4 {
  margin: 0 0 var(--s-4);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

h1 { font-size: var(--fs-3xl); line-height: 1.15; }
h2 { font-size: var(--fs-2xl); line-height: 1.2; }
h3 { font-size: var(--fs-xl); line-height: 1.3; }
h4 { font-size: var(--fs-lg); line-height: 1.35; }

p { margin: 0 0 var(--s-4); color: var(--text-secondary); }

.eyebrow {
  display: inline-block;
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-500);
  font-weight: 600;
  padding: 6px 12px;
  border: 1px solid var(--border-gold);
  border-radius: var(--r-full);
  background: var(--glass-gold);
}

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-gold { color: var(--gold-500); }
.text-blue { color: var(--blue-500); }
.text-gradient {
  background: linear-gradient(135deg, var(--gold-300), var(--gold-500) 50%, var(--blue-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 4. Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-5);
}

.section {
  padding: var(--s-9) 0;
  position: relative;
}
.section--sm { padding: var(--s-7) 0; }
.section--lg { padding: 120px 0; }

.grid {
  display: grid;
  gap: var(--s-5);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.row { display: flex; gap: var(--s-4); flex-wrap: wrap; }
.row--center { align-items: center; justify-content: center; }
.row--between { justify-content: space-between; align-items: center; }

/* ---------- 5. Header / Nav ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(255,255,255,0.85);
  border-bottom: 1px solid var(--border-subtle);
}
.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--s-5);
  max-width: var(--container);
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-weight: 700;
  font-size: var(--fs-md);
  letter-spacing: -0.01em;
}
.brand__logo {
  height: 40px;
  width: auto;
  display: block;
}
@media (max-width: 480px) {
  .brand__logo { height: 32px; }
}
/* Legacy mark + name (deprecated, kept for fallback) */
.brand__mark {
  width: 36px; height: 36px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--gold-500), var(--gold-700));
  display: grid; place-items: center;
  color: var(--text-on-gold);
  font-family: 'KoPubWorld Dotum', 'Pretendard', 'Noto Sans KR', system-ui, sans-serif;
  font-size: 19px;
  font-weight: 700;
  box-shadow: var(--shadow-gold);
}
.brand__name {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}
.brand__name small {
  font-size: 11px;
  color: var(--gold-500);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--s-2);
}
.nav__link {
  padding: 8px 14px;
  border-radius: var(--r-md);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  transition: all 0.18s var(--ease-out);
}
.nav__link:hover {
  color: var(--text-primary);
  background: var(--glass-200);
}
.nav__link.active {
  color: var(--gold-300);
  background: var(--glass-gold);
}

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  background: var(--glass-200);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

/* ===== Nav dropdown groups ===== */
.nav__group { position: relative; }
.nav__trigger {
  background: transparent;
  border: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.nav__trigger::after {
  content: '▾';
  font-size: 10px;
  opacity: 0.6;
  transition: transform 0.2s;
}
.nav__group:hover .nav__trigger::after,
.nav__group:focus-within .nav__trigger::after { transform: rotate(180deg); }

.nav__menu {
  position: absolute;
  top: 100%; left: 0;
  min-width: 220px;
  background: var(--bg-elev-3);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  padding: 6px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all 0.18s var(--ease-out);
  z-index: 110;
  margin-top: 6px;
}
.nav__group:hover .nav__menu,
.nav__group:focus-within .nav__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav__menu-link {
  display: block;
  padding: 9px 12px;
  border-radius: var(--r-sm);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  white-space: nowrap;
  transition: all 0.15s;
}
.nav__menu-link:hover {
  background: var(--glass-200);
  color: var(--text-primary);
}
.nav__menu-link.active {
  color: var(--gold-300);
  background: var(--glass-gold);
}
.nav__menu-link small {
  display: block;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.06em;
  margin-top: 2px;
  font-weight: 400;
}
.nav__group.has-active .nav__trigger {
  color: var(--gold-300);
  background: var(--glass-gold);
}
.nav__menu__heading {
  padding: 6px 12px;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--gold-300);
  text-transform: uppercase;
  font-weight: 700;
}

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 12px 22px;
  border-radius: var(--r-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  border: 1px solid transparent;
  transition: all 0.2s var(--ease-out);
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(135deg, var(--gold-500), var(--gold-600));
  color: var(--text-on-gold);
  box-shadow: var(--shadow-gold);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(212,165,116,0.32);
}
.btn--ghost {
  background: var(--glass-100);
  color: var(--text-primary);
  border-color: var(--border-default);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover {
  background: var(--glass-300);
  border-color: var(--border-strong);
}
.btn--lg { padding: 16px 28px; font-size: var(--fs-base); }
.btn--sm { padding: 8px 14px; font-size: var(--fs-xs); }

/* ---------- 7. Cards / Glass surfaces ---------- */
.card {
  background: rgba(255,255,255,0.65);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  box-shadow: var(--shadow-sm);
  transition: all 0.25s var(--ease-out);
}
@media (hover: hover) {
  .card:hover {
    background: var(--glass-200);
    border-color: var(--border-strong);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
  }
}
.card--solid {
  background: var(--bg-elev-2);
  backdrop-filter: none;
}
.card--featured {
  background: linear-gradient(135deg, rgba(251,246,236,0.85), rgba(255,255,255,0.75));
  border-color: var(--border-gold);
}
.card__icon {
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  background: var(--glass-300);
  display: grid; place-items: center;
  font-size: 25px;
  margin-bottom: var(--s-4);
}
.card__icon--gold {
  background: linear-gradient(135deg, var(--gold-500), var(--gold-700));
  color: var(--text-on-gold);
}
.card__title {
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: var(--s-2);
}
.card__desc {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  line-height: 1.6;
}

/* ---------- 8. Tags / Chips / Badges ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: var(--fs-xs);
  font-weight: 500;
  border-radius: var(--r-full);
  background: var(--glass-200);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}
.chip--gold { background: var(--glass-gold); color: var(--gold-300); border-color: var(--border-gold); }
.chip--blue { background: var(--glass-blue); color: var(--blue-300); border-color: rgba(74,144,226,0.30); }
.chip--success { background: rgba(74,222,128,0.10); color: var(--success); border-color: rgba(74,222,128,0.25); }

.badge-num {
  display: inline-grid;
  place-items: center;
  width: 32px; height: 32px;
  border-radius: var(--r-full);
  background: var(--glass-gold);
  color: var(--gold-300);
  font-weight: 700;
  font-family: 'KoPubWorld Dotum', 'Pretendard', 'Noto Sans KR', system-ui, sans-serif;
  border: 1px solid var(--border-gold);
}

/* ---------- 9. Forms ---------- */
.input, .textarea, .select {
  width: 100%;
  padding: 12px 16px;
  background: var(--glass-100);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  color: var(--text-primary);
  font-size: var(--fs-sm);
  transition: all 0.18s var(--ease-out);
}
.input:focus, .textarea:focus, .select:focus {
  outline: none;
  border-color: var(--gold-500);
  background: var(--glass-200);
  box-shadow: 0 0 0 3px rgba(212,165,116,0.15);
}
.input::placeholder, .textarea::placeholder { color: var(--text-muted); }
.textarea { resize: vertical; min-height: 120px; }

/* ---------- 10. Tables ---------- */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-sm);
}
.table th, .table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}
.table th {
  font-weight: 600;
  color: var(--gold-300);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--fs-xs);
  background: var(--glass-100);
}
.table tr:hover td { background: var(--glass-100); }

/* ---------- 11. Footer (Premium) ---------- */
.footer {
  margin-top: var(--s-9);
  border-top: 1px solid var(--border-subtle);
  background:
    linear-gradient(180deg, transparent 0%, rgba(212,165,116,0.04) 30%, transparent 100%),
    var(--bg-elev-1);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  position: relative;
  overflow: hidden;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-500) 25%, var(--blue-500) 75%, transparent);
  opacity: 0.5;
}
.footer__cta-strip {
  background:
    linear-gradient(135deg, rgba(212,165,116,0.08), rgba(74,144,226,0.06));
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--s-6) 0;
}
.footer__cta-strip h3 { margin: 0 0 4px; color: var(--text-primary); font-size: var(--fs-lg); }
.footer__cta-strip p { margin: 0; color: var(--text-secondary); }
.footer__main { padding: var(--s-7) 0 var(--s-5); }
.footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.2fr;
  gap: var(--s-6);
}
.footer__brand-col img {
  height: 48px;
  width: auto;
  margin-bottom: var(--s-4);
  display: block;
}
.footer__tagline {
  color: var(--text-secondary);
  margin-bottom: var(--s-4);
  font-size: var(--fs-sm);
  line-height: 1.6;
}
.footer__langs {
  display: flex;
  gap: 4px;
  font-size: 19px;
  margin-bottom: var(--s-4);
  flex-wrap: wrap;
  filter: saturate(0.92);
}
.footer__social {
  display: flex;
  gap: 8px;
}
.footer__social a {
  width: 36px; height: 36px;
  background: var(--glass-100);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  display: grid; place-items: center;
  color: var(--text-secondary);
  transition: all 0.2s var(--ease-out);
}
.footer__social a:hover {
  color: var(--gold-300);
  border-color: var(--border-gold);
  background: var(--glass-gold);
  transform: translateY(-2px);
}
.footer__col h5 {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-300);
  text-transform: uppercase;
  margin: 0 0 var(--s-4);
  font-weight: 700;
}
.footer__col a {
  display: block;
  padding: 6px 0;
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  transition: color 0.18s, transform 0.18s;
}
.footer__col a:hover {
  color: var(--gold-300);
  transform: translateX(4px);
}
.footer__col p {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  margin: 0 0 6px;
  line-height: 1.6;
}
.footer__divider {
  height: 1px;
  border: none;
  background: linear-gradient(90deg, transparent, var(--border-default), transparent);
  margin: var(--s-6) 0 var(--s-5);
}
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--s-3);
  font-size: var(--fs-xs);
  color: var(--text-muted);
}
.footer__legal {
  display: flex;
  gap: var(--s-4);
  flex-wrap: wrap;
  align-items: center;
}
.footer__legal a {
  color: var(--text-muted);
  transition: color 0.18s;
}
.footer__legal a:hover { color: var(--gold-300); }
.footer__seal {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--border-gold);
  border-radius: var(--r-full);
  background: var(--glass-gold);
  color: var(--gold-300);
  font-size: 11px;
  letter-spacing: 0.12em;
  font-weight: 600;
  text-transform: uppercase;
}

@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand-col { grid-column: span 2; }
}
@media (max-width: 640px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__brand-col { grid-column: span 1; }
  .footer__cta-strip .row { flex-direction: column !important; align-items: flex-start !important; }
}

/* ---------- 12. Hero ---------- */
.hero {
  position: relative;
  padding: 120px 0 var(--s-9);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(800px 400px at 30% 20%, rgba(212,165,116,0.16), transparent 60%),
    radial-gradient(600px 400px at 80% 60%, rgba(74,144,226,0.10), transparent 60%);
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 1; text-align: center; }
.hero__title {
  font-size: clamp(41px, 7vw, var(--fs-display));
  margin: var(--s-5) 0 var(--s-4);
}
.hero__sub {
  font-size: clamp(17px, 2vw, var(--fs-md));
  max-width: 720px;
  margin: 0 auto var(--s-6);
  color: var(--text-secondary);
}
.hero__cta { display: inline-flex; gap: var(--s-3); flex-wrap: wrap; justify-content: center; }

/* ---------- 13. Animation ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.animate-up { animation: fadeUp 0.6s var(--ease-out) backwards; }
.animate-up.delay-1 { animation-delay: 0.1s; }
.animate-up.delay-2 { animation-delay: 0.2s; }
.animate-up.delay-3 { animation-delay: 0.3s; }
.animate-up.delay-4 { animation-delay: 0.4s; }

/* ---------- 14. Utilities ---------- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-0 { margin-top: 0; } .mt-2 { margin-top: var(--s-2); }
.mt-4 { margin-top: var(--s-4); } .mt-6 { margin-top: var(--s-6); }
.mt-8 { margin-top: var(--s-7); }
.mb-0 { margin-bottom: 0; } .mb-2 { margin-bottom: var(--s-2); }
.mb-4 { margin-bottom: var(--s-4); } .mb-6 { margin-bottom: var(--s-6); }
.mb-8 { margin-bottom: var(--s-7); }
.gap-2 { gap: var(--s-2); } .gap-4 { gap: var(--s-4); } .gap-6 { gap: var(--s-6); }
.flex { display: flex; } .grid-c { display: grid; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.w-full { width: 100%; }
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-default), transparent);
  margin: var(--s-7) 0;
}

/* ---------- 15. KPI / Stat ---------- */
.stat {
  text-align: center;
  padding: var(--s-5);
}
.stat__value {
  font-family: 'KoPubWorld Dotum', 'Pretendard', 'Noto Sans KR', system-ui, sans-serif;
  font-size: var(--fs-3xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--gold-300), var(--gold-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.stat__label {
  margin-top: var(--s-2);
  color: var(--text-muted);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ---------- 16. Toast / Alert ---------- */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 14px 20px;
  background: #ffffff;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: var(--s-3);
  transform: translateX(120%);
  transition: transform 0.3s var(--ease-out);
}
.toast.show { transform: translateX(0); }

/* ---------- 17. Language Switcher (글로벌 i18n) ---------- */
.lang-switch {
  position: relative;
  margin-left: var(--s-2);
}
.lang-switch__trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--glass-100);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  color: var(--text-secondary);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all 0.18s var(--ease-out);
  backdrop-filter: blur(8px);
}
.lang-switch__trigger:hover {
  background: var(--glass-200);
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.lang-switch__trigger.open {
  background: var(--glass-gold);
  color: var(--gold-300);
  border-color: var(--border-gold);
}
.lang-switch__flag { font-size: 15px; }
.lang-switch__chev {
  transition: transform 0.2s;
  opacity: 0.6;
}
.lang-switch__trigger.open .lang-switch__chev { transform: rotate(180deg); }

.lang-switch__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--bg-elev-3);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  padding: 6px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all 0.18s var(--ease-out);
  z-index: 200;
  max-height: 360px;
  overflow-y: auto;
}
.lang-switch__menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.lang-switch__item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: none;
  border-radius: var(--r-sm);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  text-align: left;
  cursor: pointer;
  transition: all 0.15s;
}
.lang-switch__item:hover {
  background: var(--glass-200);
  color: var(--text-primary);
}
.lang-switch__item.active {
  background: var(--glass-gold);
  color: var(--gold-300);
}
.lang-switch__item .lang-switch__flag { font-size: 19px; line-height: 1; }
.lang-switch__item__name { flex: 1; }
.lang-switch__item__native {
  color: var(--text-muted);
  font-size: 12px;
  margin-left: 4px;
}
.lang-switch__item__check {
  color: var(--gold-500);
  opacity: 0;
}
.lang-switch__item.active .lang-switch__item__check { opacity: 1; }

.lang-switch__divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 4px 0;
}
.lang-switch__heading {
  padding: 6px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold-300);
  text-transform: uppercase;
  font-weight: 600;
}

/* RTL 지원 (아랍어 등) */
[dir="rtl"] .lang-switch__menu { right: auto; left: 0; }

/* ---------- 18. Mobile (모바일 화면 최적화) ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  :root {
    --header-h: 60px;
    --fs-3xl: 37px;
    --fs-2xl: 29px;
    --fs-xl: 23px;
  }
  .section { padding: var(--s-7) 0; }
  .section--lg { padding: var(--s-9) 0; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav { display: none; }
  .nav.open {
    display: flex;
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    background: var(--bg-elev-2);
    border-bottom: 1px solid var(--border-default);
    padding: var(--s-3);
    gap: 4px;
  }
  .nav.open .nav__link { padding: 12px 16px; }
  .nav.open .nav__group { width: 100%; }
  .nav.open .nav__menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: transparent;
    border: none;
    padding-left: var(--s-4);
    backdrop-filter: none;
    margin-top: 0;
  }
  .nav.open .nav__trigger::after { display: none; }
  .nav.open .nav__menu-link { padding: 10px 16px; font-size: var(--fs-xs); }
  .nav-toggle { display: inline-flex; }
  .hero { padding: 80px 0 var(--s-7); }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .container { padding: 0 var(--s-4); }
  .grid-4 { grid-template-columns: 1fr; }
  .btn { width: 100%; justify-content: center; }
  .hero__cta { flex-direction: column; width: 100%; }
}

@media (max-width: 768px) {
  .lang-switch__trigger { padding: 8px 10px; }
  .lang-switch__trigger__name { display: none; }
}

/* ---------- 19. Abbreviation auto-expansion (자동 약어 풀이) ---------- */
.abbr-expansion {
  font-size: 0.78em;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: -0.005em;
  /* 자연스러운 줄바꿈: nowrap 제거 — 좁은 컬럼에서도 끼임 방지 */
  word-break: keep-all;
  overflow-wrap: anywhere;
}

/* ---------- 20. Print (제안서 출력용) ---------- */
@media print {
  body { background: white; color: black; }
  .header, .footer, .nav-toggle { display: none; }
  .card { background: #f8f8f8; border: 1px solid #ddd; box-shadow: none; }
  .abbr-expansion { color: #666; }
}