/* ===== DRENC — Premium Medical Education ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: #FFFFFF;
  color: #1A1829;
  font-family: 'Nanum Gothic', 'Apple SD Gothic Neo', -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
  padding-top: 0; /* 투명 네비 — 히어로가 뷰포트 최상단부터 시작 */
}

/*
 * font-serif = Playfair Display(영문) / 한국어는 Nanum Gothic 자동 폴백
 * header.php <style> 블록의 !important 규칙에서 폴백이 처리됨
 */
.font-serif { font-family: 'Playfair Display', 'Nanum Gothic', Georgia, sans-serif; }

/* ===== 한국어 타이포그래피 스케일 ===== */
/*
 * 나눔고딕은 굵은 가중치(800)에서 가장 품격 있게 보임
 * 큰 사이즈일수록 자간을 더 좁게(-0.04em), 행간은 1.15~1.25
 */

/* 디스플레이 헤딩 (히어로 H1) */
.heading-display {
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.12;
  word-break: keep-all;
}
/* 섹션 헤딩 (H2) */
.heading-section {
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.22;
  word-break: keep-all;
}
/* 카드/서브 헤딩 (H3) */
.heading-sub {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
  word-break: keep-all;
}

h1, h2, h3, h4 {
  word-break: keep-all;
  line-height: 1.25;
}
p, li { line-height: 1.9; word-break: keep-all; }

/* ===== DESIGN TOKENS ===== */
:root {
  --navy:        #0D1B3E;
  --navy-mid:    #1E3A7B;
  --navy-light:  #2B509E;
  --navy-pale:   #EEF2FB;

  --gold:        #B8940A;
  --gold-mid:    #C9A84C;
  --gold-light:  #E9D08A;
  --gold-pale:   #FBF6E8;

  --ink:         #1A1829;
  --ink-soft:    #4A4860;
  --ink-muted:   #8B8899;

  --white:       #FFFFFF;
  --paper:       #F7F4EF;
  --paper-mid:   #EFECE4;
  --border:      #E4E0D6;
  --border-soft: #EEE9DF;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.45s;
}

h1, h2, h3, h4 { word-break: keep-all; }
p, li           { line-height: 1.9; word-break: keep-all; }

/* ===== NAVIGATION ===== */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  transition: background var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-bottom-color var(--dur) var(--ease);
  background: transparent;
  border-bottom: 1px solid transparent;
}
#site-header.scrolled {
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
  box-shadow: 0 2px 16px rgba(0,0,0,0.06);
}

/* 투명 상태 nav 링크 (히어로 위) */
#site-header:not(.scrolled) .nav-link         { color: rgba(255,255,255,0.82); }
#site-header:not(.scrolled) .nav-link:hover   { color: #fff; }
#site-header:not(.scrolled) .nav-active       { color: #fff !important; }
#site-header:not(.scrolled) .lang-toggle      { border-color: rgba(255,255,255,0.35); color: rgba(255,255,255,0.82); }
#site-header:not(.scrolled) .lang-toggle:hover{ background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.6); color: #fff; }
#site-header:not(.scrolled) .hamburger-line   { background: #fff !important; }
#site-header:not(.scrolled) .header-accent    { opacity: 0; }

/* 스크롤된 상태 */
#site-header.scrolled .nav-link         { color: var(--ink-soft); }
#site-header.scrolled .nav-link:hover   { color: var(--navy-mid); }
#site-header.scrolled .nav-active       { color: var(--navy-mid) !important; }
#site-header.scrolled .lang-toggle      { border-color: var(--border); color: var(--ink-soft); }
#site-header.scrolled .lang-toggle:hover{ background: var(--navy-pale); border-color: var(--navy-mid); color: var(--navy-mid); }
#site-header.scrolled .header-accent    { opacity: 1; }

.nav-link {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color 0.25s;
  position: relative;
  padding-bottom: 2px;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--gold-mid);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.nav-link:hover::after,
.nav-active::after { transform: scaleX(1); }

.lang-toggle {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.875rem;
  border: 1.5px solid;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.25s var(--ease);
}

/* 헤더 하단 강조선 (스크롤 후 표시) */
.header-accent {
  height: 3px;
  background: linear-gradient(90deg, var(--navy) 0%, var(--gold-mid) 50%, var(--navy) 100%);
  transition: opacity var(--dur) var(--ease);
}

/* ===== FULL-VIEWPORT HERO ===== */
.hero-fullvp {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/images/index_bg.jpg') center/cover no-repeat;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    115deg,
    rgba(13,27,62,0.92) 0%,
    rgba(13,27,62,0.75) 45%,
    rgba(13,27,62,0.35) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 160px 2.5rem 7rem;
  width: 100%;
}

/* 히어로 배지 */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  border: 1px solid rgba(201,168,76,0.35);
  background: rgba(201,168,76,0.08);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-mid);
  margin-bottom: 2rem;
}
.hero-badge-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--gold-mid);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.6); }
}

/* 히어로 H1 */
.hero-h1 {
  font-size: clamp(2.8rem, 5.5vw, 5rem);
  font-weight: 800;
  line-height: 1.12;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.hero-h1 .accent { color: var(--gold-mid); }

/* 히어로 구분선 */
.hero-divider {
  width: 56px; height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  margin-bottom: 1.5rem;
}

/* 히어로 스탯 바 */
.stat-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,0.06);
}
.stat-bar-item {
  padding: 2rem 2.5rem;
  border-right: 1px solid rgba(255,255,255,0.08);
  position: relative;
}
.stat-bar-item::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.stat-bar-item:hover::before { opacity: 1; }
.stat-bar-item:last-child { border-right: none; }
.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--gold-mid);
  letter-spacing: -0.04em;
  line-height: 1;
  display: block;
}

/* ===== SECTION LABEL ===== */
.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--navy-mid);
  margin-bottom: 1.25rem;
}
.section-eyebrow::before {
  content: '';
  display: block;
  width: 28px; height: 2px;
  background: var(--gold);
  flex-shrink: 0;
}

/* ===== PARTNER GRID — 원래 이미지 사이즈 ===== */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  background: var(--border);
  gap: 1px;
}
.partner-item {
  background: #fff;
  padding: 1.75rem 2rem;
  flex: 1 1 calc(33.333% - 2px);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s var(--ease);
}
.partner-item:hover { background: var(--paper); }
.partner-item img {
  display: block;
  width: 100%;      /* 셀 폭에 맞춤 */
  height: auto;     /* 원래 비율 유지 */
  max-width: 100%;
  object-fit: contain;
}
@media (max-width: 640px) {
  .partner-item { flex: 1 1 calc(50% - 1px); }
}

/* ===== PROGRAM CARDS ===== */
.program-card {
  background: #fff;
  border: 1px solid var(--border);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.program-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--navy-mid), var(--gold-mid));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.program-card:hover::before  { transform: scaleX(1); }
.program-card:hover {
  box-shadow: 0 20px 56px rgba(13,27,62,0.10);
  transform: translateY(-4px);
}

/* ===== PILLAR CARDS ===== */
.pillar-card {
  background: var(--paper);
  border: 1px solid var(--border-soft);
  padding: 1.75rem;
  transition: background var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.pillar-card:hover {
  background: #fff;
  box-shadow: 0 10px 32px rgba(0,0,0,0.07);
  transform: translateY(-3px);
}

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.9rem 2rem;
  background: var(--navy-mid);
  color: #fff;
  font-family: 'Nanum Gothic', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur) var(--ease);
}
.btn-primary:hover {
  background: var(--navy-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(30,58,123,0.28);
}
.btn-primary:active { transform: scale(0.98); }

.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.9rem 2rem;
  background: linear-gradient(135deg, var(--gold), var(--gold-mid));
  color: #fff;
  font-family: 'Nanum Gothic', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur) var(--ease);
  box-shadow: 0 4px 18px rgba(184,148,10,0.2);
}
.btn-gold:hover {
  opacity: 0.92;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(184,148,10,0.32);
}
.btn-gold:active { transform: scale(0.98); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.9rem 2rem;
  background: transparent;
  color: var(--navy-mid);
  font-family: 'Nanum Gothic', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  border: 1.5px solid var(--navy-mid);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur) var(--ease);
}
.btn-outline:hover { background: var(--navy-pale); }

.btn-outline-white {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.9rem 2rem;
  background: rgba(255,255,255,0.08);
  color: #fff;
  font-family: 'Nanum Gothic', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  border: 1.5px solid rgba(255,255,255,0.3);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur) var(--ease);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.55);
  transform: translateY(-1px);
}

/* ===== FORM ===== */
.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--ink);
  font-family: 'Nanum Gothic', sans-serif;
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-input::placeholder { color: var(--ink-muted); }
.form-input:focus {
  border-color: var(--navy-mid);
  box-shadow: 0 0 0 3px rgba(30,58,123,0.08);
}

/* ===== DIVIDERS ===== */
.divider-gold {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-mid), transparent);
  opacity: 0.35;
}
.divider-light { height: 1px; background: var(--border); }

/* ===== SCROLL REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(1.5rem);
  filter: blur(3px);
  transition: opacity 0.65s var(--ease),
              transform 0.65s var(--ease),
              filter 0.65s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; filter: none; }
.reveal-d1 { transition-delay:  80ms; }
.reveal-d2 { transition-delay: 160ms; }
.reveal-d3 { transition-delay: 240ms; }
.reveal-d4 { transition-delay: 320ms; }

/* ===== 서브 페이지 호환 ===== */
.bg-navy-950 { background: var(--navy) !important; color: #fff; }
.text-gold-500 { color: var(--gold-mid) !important; }
.card-dark {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  transition: border-color var(--dur) var(--ease),
              background var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.card-dark:hover {
  background: rgba(255,255,255,0.09);
  border-color: rgba(201,168,76,0.4);
  transform: translateY(-3px);
}

/* ===== MOBILE MENU ===== */
#mobile-overlay {
  position: fixed; inset: 0; z-index: 48;
  background: rgba(13,27,62,0.55);
  backdrop-filter: blur(6px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.35s var(--ease);
}
#mobile-overlay.open { opacity: 1; pointer-events: all; }
#mobile-panel {
  position: fixed; top: 0; right: 0;
  height: 100dvh; width: 290px; z-index: 49;
  background: #fff;
  padding: 5.5rem 2rem 2rem;
  transform: translateX(100%);
  transition: transform 0.45s var(--ease);
  display: flex; flex-direction: column;
  border-left: 1px solid var(--border);
}
#mobile-panel.open { transform: translateX(0); }
.mobile-nav-link {
  display: block;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border-soft);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s, padding-left 0.3s var(--ease);
}
.mobile-nav-link:hover { color: var(--navy-mid); padding-left: 0.5rem; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: #fff; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--navy-mid); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .stat-bar { grid-template-columns: repeat(2, 1fr); }
  .stat-bar-item:nth-child(2) { border-right: none; }
  .stat-bar-item:nth-child(3),
  .stat-bar-item:nth-child(4) { border-top: 1px solid rgba(255,255,255,0.08); }
}
@media (max-width: 768px) {
  .hero-content { padding: 120px 1.5rem 5rem; }
  .hero-h1 { font-size: 2.4rem; }
  .stat-number { font-size: 2rem; }
  .stat-bar-item { padding: 1.5rem 1.25rem; }
  .partner-item { padding: 1rem 1.25rem; }
}
@media (max-width: 480px) {
  .stat-bar { grid-template-columns: repeat(2, 1fr); }
}