/* ============================================================
   AI가 바꾸는 자동차 산업의 미래 - 랜딩페이지 스타일시트
   Blueprint / Engineering Document Style
   ============================================================ */

/* ─── Page fade-in on load ─── */
body {
  animation: pageFadeIn 0.5s ease forwards;
}
@keyframes pageFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ─── CSS Variables ─── */
:root {
  --white: #FFFFFF;
  --black: #111111;
  --orange: #FF5A1F;
  --orange-light: #FF7A4A;
  --navy: #071B5D;
  --navy-light: #0D2B8C;
  --gray-line: #D9DEE7;
  --gray-bg: #F4F6FA;
  --gray-mid: #8B96A9;
  --gray-dark: #3D4A5C;
  --font-kr: 'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;
  --font-en: 'Inter', 'Helvetica Neue', sans-serif;
  --bp-dot: rgba(7, 27, 93, 0.06);
  --transition: 0.3s ease;
  --shadow-sm: 0 2px 12px rgba(7,27,93,0.07);
  --shadow-md: 0 8px 32px rgba(7,27,93,0.12);
  --shadow-lg: 0 16px 48px rgba(7,27,93,0.16);
}

/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-kr);
  color: var(--black);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ─── Container ─── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Blueprint Background ─── */
.blueprint-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.bp-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--bp-dot) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-dot) 1px, transparent 1px);
  background-size: 40px 40px;
}
.bp-cross {
  position: absolute;
  width: 40px;
  height: 40px;
}
.bp-cross::before,
.bp-cross::after {
  content: '';
  position: absolute;
  background: rgba(7,27,93,0.15);
}
.bp-cross::before { width: 1px; height: 100%; left: 50%; }
.bp-cross::after  { height: 1px; width: 100%; top: 50%; }
.bp-cross-1 { top: 60px; left: 8%; }
.bp-cross-2 { bottom: 80px; right: 10%; }

.bp-corner {
  position: absolute;
  width: 20px;
  height: 20px;
  border-color: rgba(7,27,93,0.2);
  border-style: solid;
}
.bp-corner-tl { top: 20px; left: 20px; border-width: 2px 0 0 2px; }
.bp-corner-tr { top: 20px; right: 20px; border-width: 2px 2px 0 0; }
.bp-corner-bl { bottom: 20px; left: 20px; border-width: 0 0 2px 2px; }
.bp-corner-br { bottom: 20px; right: 20px; border-width: 0 2px 2px 0; }

/* ─── Section Label Row ─── */
.section-label-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.section-doc-tag {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--orange);
  white-space: nowrap;
  text-transform: uppercase;
}
.orange-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), transparent);
}
.center-label { justify-content: center; }
.center-label .orange-line { flex: 0 0 60px; }
.short-line { background: linear-gradient(90deg, transparent, var(--orange), transparent) !important; }

/* ─── Section Title ─── */
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: var(--navy);
  line-height: 1.3;
  margin-bottom: 20px;
}
.section-title .accent { color: var(--orange); }
.section-lead {
  font-size: 1.05rem;
  color: var(--gray-dark);
  line-height: 1.8;
  margin-bottom: 16px;
}
.section-body {
  font-size: 1rem;
  color: var(--gray-dark);
  line-height: 1.8;
  margin-bottom: 16px;
}
.section-emphasis {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-primary {
  background: var(--orange);
  color: var(--white);
  border: 2px solid var(--orange);
}
.btn-primary:hover {
  background: var(--orange-light);
  border-color: var(--orange-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,90,31,0.35);
}
.btn-secondary {
  background: var(--navy);
  color: var(--white);
  border: 2px solid var(--navy);
}
.btn-secondary:hover {
  background: var(--navy-light);
  border-color: var(--navy-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(7,27,93,0.35);
}
.btn-outline {
  background: transparent;
  color: var(--navy);
  border: 2px solid var(--navy);
}
.btn-outline:hover {
  background: var(--navy);
  color: var(--white);
  transform: translateY(-2px);
}

/* ─── Section Base ─── */
.section {
  padding: 96px 0;
  position: relative;
}

/* ======================================================
   NAVIGATION
   ====================================================== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-line);
  transition: box-shadow var(--transition);
}
#navbar.scrolled {
  box-shadow: var(--shadow-md);
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-brand {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  min-width: 120px;
}
.brand-tag {
  font-family: var(--font-en);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--orange);
  text-transform: uppercase;
}
.brand-name {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--navy);
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  gap: 28px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-dark);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 2px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--orange);
  transition: width var(--transition);
}
.nav-links a:hover { color: var(--orange); }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  background: var(--orange);
  color: var(--white);
  padding: 8px 18px;
  border-radius: 4px;
  font-size: 0.82rem;
  font-weight: 700;
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-cta:hover { background: var(--orange-light); transform: translateY(-1px); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--navy);
  transition: all var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ======================================================
   HERO SECTION
   ====================================================== */
#hero {
  min-height: 100vh;
  padding-top: 64px;
  display: flex;
  align-items: center;
  background: var(--white);
  overflow: hidden;
  position: relative;
}
.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
  width: 100%;
}

/* Hero - Left Content */
.hero-content { }
.doc-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.doc-tag {
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--white);
  background: var(--orange);
  padding: 3px 10px;
  text-transform: uppercase;
}
.doc-rev {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--gray-mid);
}
.hero-org {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 3px solid var(--orange);
}
.org-badge {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--navy);
}
.org-course {
  font-size: 0.8rem;
  color: var(--gray-dark);
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900;
  line-height: 1.15;
  color: var(--navy);
  margin-bottom: 16px;
  word-break: keep-all;
}
.title-line { display: block; }
.accent-line { color: var(--orange); }
.hero-subtitle {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--gray-dark);
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--gray-line);
}
.hero-desc {
  font-size: 0.95rem;
  color: var(--gray-dark);
  line-height: 1.85;
  margin-bottom: 24px;
}
.hero-desc strong { color: var(--navy); font-weight: 700; }

/* Tech Tags */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.tech-tag {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--navy);
  background: var(--gray-bg);
  border: 1px solid var(--gray-line);
  padding: 5px 12px;
  border-radius: 2px;
  transition: all var(--transition);
}
.tech-tag:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.tech-tag i { margin-right: 4px; color: var(--orange); }

/* Hero Points */
.hero-points {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 32px;
}
.hero-points li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--gray-dark);
  font-weight: 500;
}
.hero-points li i { color: var(--orange); font-size: 0.8rem; }

/* Hero CTA */
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Hero - Right Visual */
.hero-visual {
  position: relative;
}
.visual-frame {
  position: relative;
  background: var(--gray-bg);
  border: 1px solid var(--gray-line);
  padding: 0;
  border-radius: 4px;
  overflow: hidden;
}
.visual-frame::before,
.visual-frame::after {
  content: '';
  position: absolute;
  background: var(--orange);
  z-index: 1;
}
.visual-frame::before { top: 0; left: 0; right: 0; height: 3px; }
.visual-frame::after  { top: 0; left: 0; bottom: 0; width: 3px; }

.hero-poster {
  width: 100%;
  border-radius: 2px;
  box-shadow: var(--shadow-md);
}

/* Blueprint annotation labels */
.frame-label {
  position: absolute;
  font-family: var(--font-en);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--navy);
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--gray-line);
  padding: 3px 8px;
  white-space: nowrap;
  z-index: 2;
}
.frame-label::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 1px;
  background: var(--orange);
}
.frame-label-suite { top: 60px; right: -8px; }
.frame-label-suite::before { right: 100%; top: 50%; transform: translateX(-4px); }
.frame-label-connect { top: 100px; right: -8px; }
.frame-label-connect::before { right: 100%; top: 50%; transform: translateX(-4px); }
.frame-label-edrive { bottom: 100px; left: -8px; }
.frame-label-edrive::before { left: 100%; top: 50%; transform: translateX(4px); }
.frame-label-battery { bottom: 60px; left: 50%; transform: translateX(-50%); }
.frame-label-chassis { bottom: 100px; right: -8px; }
.frame-label-chassis::before { right: 100%; top: 50%; transform: translateX(-4px); }

/* Dimension lines */
.dim-measure {
  font-family: var(--font-en);
  font-size: 9px;
  font-weight: 600;
  color: var(--orange);
  letter-spacing: 0.08em;
  position: absolute;
}
.dim-width  { bottom: 20px; left: 50%; transform: translateX(-50%); }
.dim-height { right: 10px; top: 50%; transform: translateY(-50%) rotate(90deg); }

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--gray-mid);
  font-family: var(--font-en);
  font-size: 9px;
  letter-spacing: 0.2em;
  animation: bounce 2s infinite;
  z-index: 1;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* ======================================================
   PROBLEM SECTION
   ====================================================== */
.section-problem {
  background: var(--gray-bg);
  border-top: 1px solid var(--gray-line);
  border-bottom: 1px solid var(--gray-line);
}
.section-problem .section-title { color: var(--navy); }

.target-grid {
  margin-top: 40px;
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-left: 4px solid var(--orange);
  padding: 32px;
}
.target-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--gray-line);
}
.target-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  font-size: 0.95rem;
  color: var(--gray-dark);
  border-bottom: 1px solid rgba(217,222,231,0.5);
}
.target-list li:last-child { border-bottom: none; }
.target-list li i { color: var(--orange); margin-top: 4px; }

/* ======================================================
   CORE MESSAGE SECTION
   ====================================================== */
.section-core { background: var(--white); }
.core-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.core-text p {
  font-size: 0.95rem;
  color: var(--gray-dark);
  line-height: 1.85;
  margin-bottom: 16px;
}
.core-text strong { color: var(--navy); }
.core-quote {
  margin-top: 32px;
  padding: 24px 28px;
  border-left: 4px solid var(--orange);
  background: var(--gray-bg);
  font-size: 0.95rem;
  color: var(--navy);
  line-height: 1.85;
  font-style: normal;
  position: relative;
}
.core-quote strong { color: var(--orange); }

.core-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.tech-card {
  background: var(--gray-bg);
  border: 1px solid var(--gray-line);
  padding: 24px 20px;
  border-radius: 4px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.tech-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.tech-card:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}
.tech-card:hover::after { transform: scaleX(1); }
.tc-icon {
  width: 40px;
  height: 40px;
  background: var(--navy);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 12px;
}
.tech-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 4px;
}
.tech-card p {
  font-size: 0.8rem;
  color: var(--gray-mid);
  line-height: 1.5;
}

/* ======================================================
   CURRICULUM SECTION
   ====================================================== */
.section-curriculum {
  background: var(--navy);
  color: var(--white);
}
.section-curriculum .section-title { color: var(--white); }
.section-curriculum .section-title .accent { color: var(--orange); }
.section-curriculum .orange-line { background: linear-gradient(90deg, var(--orange), transparent); }
.section-curriculum .section-doc-tag { color: var(--orange); }

.curriculum-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 48px;
}
.curriculum-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  padding: 36px 32px;
  border-radius: 4px;
  position: relative;
  transition: all var(--transition);
}
.curriculum-card:hover {
  background: rgba(255,255,255,0.07);
  border-color: var(--orange);
}
.curriculum-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--orange);
}
.cc-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.cc-num {
  flex-shrink: 0;
  background: var(--orange);
  color: var(--white);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 2px;
  white-space: nowrap;
  margin-top: 4px;
}
.cc-header h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.3;
}
.cc-desc {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 24px;
  line-height: 1.7;
}
.cc-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}
.cc-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.85);
  line-height: 1.55;
}
.num-badge {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  background: rgba(255,90,31,0.2);
  border: 1px solid var(--orange);
  color: var(--orange);
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  margin-top: 1px;
}
.cc-detail {
  background: rgba(0,0,0,0.2);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 20px 24px;
  border-radius: 4px;
}
.cc-detail p {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--orange);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.detail-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.detail-list li {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
  padding-left: 10px;
  position: relative;
}
.detail-list li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--orange);
}

/* ======================================================
   RESULTS SECTION
   ====================================================== */
.section-results {
  background: var(--gray-bg);
  border-top: 1px solid var(--gray-line);
  border-bottom: 1px solid var(--gray-line);
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.result-card {
  background: var(--white);
  border: 1px solid var(--gray-line);
  padding: 32px 24px;
  border-radius: 4px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}
.result-card:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.result-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--orange);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.result-card:hover::before { transform: scaleX(1); }
.rc-icon {
  width: 48px;
  height: 48px;
  background: var(--gray-bg);
  border: 2px solid var(--gray-line);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--orange);
  margin-bottom: 12px;
  transition: all var(--transition);
}
.result-card:hover .rc-icon {
  background: var(--orange);
  color: var(--white);
  border-color: var(--orange);
}
.rc-num {
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gray-mid);
  margin-bottom: 8px;
}
.result-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
  line-height: 1.4;
}
.result-card p {
  font-size: 0.85rem;
  color: var(--gray-dark);
  line-height: 1.65;
}

/* ======================================================
   GALLERY SECTION
   ====================================================== */
.section-gallery { background: var(--white); }

/* ── Gallery Grid: 3열 균일 카드 ── */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 48px;
}

/* 모든 카드 동일 스타일 */
.gallery-item {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid var(--gray-line);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(7,27,93,0.06);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}
.gallery-item:hover {
  box-shadow: 0 8px 28px rgba(7,27,93,0.13);
  transform: translateY(-3px);
}

/* 이미지: 16:9 비율 고정 */
.gallery-item img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center center;
  display: block;
  transition: transform 0.5s ease;
}
.gallery-item:hover img { transform: scale(1.04); }

/* gallery-main의 span 효과 완전 제거 */
.gallery-main {
  grid-column: unset;
}

/* 캡션 */
figcaption {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 11px 14px;
  font-size: 0.78rem;
  font-weight: 500;
  color: #5F6B7A;
  background: #F8FAFC;
  border-top: 1px solid var(--gray-line);
  line-height: 1.5;
  min-height: 44px;
}

.gallery-quote {
  margin-top: 48px;
  text-align: center;
  padding: 36px;
  border: 1px solid var(--gray-line);
  background: var(--gray-bg);
  position: relative;
}
.gallery-quote::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--orange), transparent);
}
.gallery-quote p {
  font-size: 1.05rem;
  color: var(--gray-dark);
  line-height: 1.9;
}
.gallery-quote strong { color: var(--orange); font-weight: 700; }
.gallery-quote .fa-quote-left,
.gallery-quote .fa-quote-right {
  color: var(--gray-line);
  font-size: 1.2rem;
  margin: 0 6px;
}

/* ======================================================
   DIFFERENTIATORS SECTION
   ====================================================== */
.section-diff {
  background: var(--gray-bg);
  border-top: 1px solid var(--gray-line);
  border-bottom: 1px solid var(--gray-line);
}
.diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.diff-card {
  background: var(--white);
  border: 1px solid var(--gray-line);
  padding: 28px 24px;
  border-radius: 4px;
  text-align: center;
  transition: all var(--transition);
}
.diff-card:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow-sm);
  transform: translateY(-4px);
}
.diff-icon {
  width: 56px;
  height: 56px;
  background: var(--navy);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--white);
  margin: 0 auto 16px;
  transition: all var(--transition);
}
.diff-card:hover .diff-icon { background: var(--orange); }
.diff-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}
.diff-card p {
  font-size: 0.85rem;
  color: var(--gray-dark);
  line-height: 1.6;
}

/* ======================================================
   TARGET EDUCATION SECTION
   ====================================================== */
.section-target { background: var(--white); }
.target-edu-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.target-edu-item {
  background: var(--gray-bg);
  border: 1px solid var(--gray-line);
  padding: 24px 16px;
  text-align: center;
  border-radius: 4px;
  transition: all var(--transition);
}
.target-edu-item:hover {
  border-color: var(--orange);
  background: var(--white);
  transform: translateY(-2px);
}
.target-edu-item i {
  font-size: 1.6rem;
  color: var(--orange);
  margin-bottom: 12px;
  display: block;
}
.target-edu-item p {
  font-size: 0.82rem;
  color: var(--gray-dark);
  line-height: 1.5;
  font-weight: 500;
}

/* ======================================================
   FORMAT SECTION
   ====================================================== */
.section-format { background: var(--gray-bg); }
.format-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
  align-items: stretch;
}
.format-card {
  background: var(--white);
  border: 1px solid var(--gray-line);
  padding: 36px 28px;
  border-radius: 4px;
  position: relative;
  transition: all var(--transition);
}
.format-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.format-highlight {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.format-highlight h3 { color: #ffffff !important; }
.format-highlight p  { color: rgba(255,255,255,0.9) !important; }
.format-highlight ul li { color: rgba(255,255,255,0.85); }

.format-duration {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 16px;
}
.duration-num {
  font-family: var(--font-en);
  font-size: 3rem;
  font-weight: 800;
  color: var(--orange);
  line-height: 1;
}
.duration-unit {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-dark);
}
.format-highlight .duration-unit { color: rgba(255,255,255,0.7); }
.format-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 10px;
}
.format-card p {
  font-size: 0.88rem;
  color: var(--gray-dark);
  margin-bottom: 20px;
  line-height: 1.65;
}
.format-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.format-card ul li {
  font-size: 0.85rem;
  color: var(--gray-dark);
  padding-left: 14px;
  position: relative;
}
.format-highlight ul li { color: rgba(255,255,255,0.75); }
.format-card ul li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--orange);
  font-weight: 700;
}

.recommended-badge {
  position: absolute;
  top: -1px;
  right: 20px;
  background: var(--orange);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 0 0 6px 6px;
  letter-spacing: 0.04em;
}

/* ======================================================
   INSTRUCTOR SECTION
   ====================================================== */
.section-instructor { background: var(--white); }
.instructor-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 60px;
  align-items: start;
  margin-top: 48px;
}
.instructor-photo-wrap {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.photo-frame {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  border: 2px solid var(--gray-line);
}
.photo-frame::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--orange);
  z-index: 2;
}
.instructor-photo {
  width: 100%;
  height: 320px;
  object-fit: cover;
  object-position: center top;
  background: #f8f9fb;
  transition: filter var(--transition);
}
.photo-frame:hover .instructor-photo { filter: grayscale(0); }
.photo-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(7,27,93,0.8));
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 24px 14px 12px;
  letter-spacing: 0.04em;
}
.instructor-title-block {
  text-align: center;
}
.instructor-name {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--navy);
  margin-bottom: 6px;
}
.instructor-role {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--orange);
  margin-bottom: 4px;
}
.instructor-org {
  font-size: 0.85rem;
  color: var(--gray-dark);
  margin-bottom: 2px;
}

.instructor-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.instructor-career,
.instructor-fields {
  padding: 24px 28px;
  border: 1px solid var(--gray-line);
  border-left: 4px solid var(--navy);
  background: var(--gray-bg);
  border-radius: 0 4px 4px 0;
}
.instructor-career h4,
.instructor-fields h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 16px;
}
.instructor-career ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.instructor-career li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--gray-dark);
}
.instructor-career li i { color: var(--orange); margin-top: 4px; font-size: 0.7rem; }

.field-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.field-tags span {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--navy);
  background: var(--white);
  border: 1px solid var(--gray-line);
  padding: 5px 12px;
  border-radius: 2px;
  transition: all var(--transition);
}
.field-tags span:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

.instructor-desc {
  padding: 24px 28px;
  border: 1px solid var(--gray-line);
  background: var(--gray-bg);
  border-radius: 4px;
}
.instructor-desc p {
  font-size: 0.92rem;
  color: var(--gray-dark);
  line-height: 1.85;
}
.instructor-desc strong { color: var(--navy); }

/* ======================================================
   FAQ SECTION
   ====================================================== */
.section-faq { background: var(--gray-bg); }
.faq-list {
  max-width: 800px;
  margin: 48px auto 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.faq-item {
  border: 1px solid var(--gray-line);
  border-top: none;
  background: var(--white);
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item:first-child { border-top: 1px solid var(--gray-line); border-radius: 4px 4px 0 0; }
.faq-item:last-child  { border-radius: 0 0 4px 4px; }
.faq-item.active { border-color: var(--orange); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--navy);
  text-align: left;
  transition: all var(--transition);
  gap: 16px;
}
.faq-question:hover { background: var(--gray-bg); color: var(--orange); }
.faq-item.active .faq-question { color: var(--orange); background: rgba(255,90,31,0.04); }
.faq-icon {
  flex-shrink: 0;
  color: var(--orange);
  font-size: 0.8rem;
  transition: transform var(--transition);
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-answer:not([hidden]) {
  max-height: 200px;
  padding: 4px 24px 20px;
}
.faq-answer p {
  font-size: 0.88rem;
  color: var(--gray-dark);
  line-height: 1.8;
}

/* ======================================================
   CTA SECTION
   ====================================================== */
.section-cta {
  background: var(--gray-bg);
  text-align: center;
  border-top: 1px solid var(--gray-line);
  padding: 120px 0;
  overflow: hidden;
}
.cta-inner { position: relative; z-index: 1; }
.cta-title { font-size: clamp(1.8rem, 4vw, 2.8rem); }
.cta-desc {
  font-size: 0.98rem;
  color: var(--gray-dark);
  line-height: 1.9;
  margin: 24px auto 40px;
  max-width: 660px;
}
.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 36px;
}
.cta-contact-info {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--gray-dark);
}
.cta-contact-info i { color: var(--orange); margin-right: 4px; }
.cta-contact-info .divider { color: var(--gray-line); }

/* ======================================================
   FOOTER
   ====================================================== */
#footer {
  background: var(--navy);
  color: rgba(255,255,255,0.8);
}
.footer-inner {
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
}
.footer-brand { }
.footer-logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 16px;
}
.footer-logo .brand-tag { color: var(--orange); }
.footer-logo .brand-name { color: var(--white); font-size: 15px; }
.footer-tagline {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 6px;
}
.footer-sub {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}
.footer-info h4,
.footer-fields h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-info ul,
.footer-fields ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-info li,
.footer-fields li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
}
.footer-info li i { color: var(--orange); margin-top: 3px; font-size: 0.75rem; }
.footer-info a { color: rgba(255,255,255,0.65); }
.footer-info a:hover { color: var(--orange); }
.footer-fields li { padding-left: 12px; position: relative; }
.footer-fields li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--orange);
}

.footer-bottom {
  background: rgba(0,0,0,0.3);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-bottom-inner {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.35);
}
.footer-meta .divider { color: rgba(255,255,255,0.15); }
.footer-copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}

/* ======================================================
   RESPONSIVE - Tablet
   ====================================================== */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    padding: 80px 24px 48px;
  }
  .hero-visual {
    display: block;
    max-width: 560px;
    margin: 0 auto;
    width: 100%;
  }
  .core-layout { grid-template-columns: 1fr; }
  .curriculum-grid { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: repeat(2, 1fr); }
  .diff-grid { grid-template-columns: repeat(2, 1fr); }
  .target-edu-grid { grid-template-columns: repeat(2, 1fr); }
  .format-grid { grid-template-columns: 1fr; }
  .instructor-layout { grid-template-columns: 1fr; }
  .instructor-photo-wrap { flex-direction: row; align-items: center; }
  .photo-frame { width: 200px; flex-shrink: 0; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-cta { display: none; }
  /* 태블릿: 2열 */
  .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .detail-list { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .hero-title { font-size: clamp(2rem, 8vw, 3rem); }
  .hero-visual {
    max-width: 100%;
  }
  .hero-points { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .diff-grid { grid-template-columns: 1fr; }
  .target-edu-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
  .cta-buttons { flex-direction: column; align-items: center; }
  .curriculum-card { padding: 24px 20px; }
  .instructor-photo-wrap { flex-direction: column; }
  /* 모바일: 1열 */
  .gallery-grid { grid-template-columns: 1fr; gap: 16px; }
  .core-cards { grid-template-columns: 1fr 1fr; }
  .section-title { font-size: clamp(1.5rem, 5vw, 2rem); }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .nav-inner { padding: 0 16px; }
  .container { padding: 0 16px; }
  .target-edu-grid { grid-template-columns: 1fr 1fr; }
  .core-cards { grid-template-columns: 1fr; }
  .cta-buttons .btn { width: 100%; justify-content: center; }
  .footer-meta { flex-direction: column; align-items: flex-start; }
  .frame-label { display: none; }
  .tech-tags { gap: 6px; }
  .tech-tag { font-size: 10px; padding: 4px 10px; }
}

/* ─── Mobile Nav Overlay ─── */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-line);
  z-index: 999;
  padding: 24px;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-lg);
}
.mobile-nav-overlay.open { display: flex; }
.mobile-nav-overlay a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-dark);
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-line);
  transition: color var(--transition);
}
.mobile-nav-overlay a:last-child { border-bottom: none; }
.mobile-nav-overlay a:hover { color: var(--orange); }
.mobile-nav-overlay .mobile-cta {
  margin-top: 8px;
  background: var(--orange);
  color: var(--white);
  text-align: center;
  padding: 14px;
  border-radius: 4px;
  font-weight: 700;
  border: none;
}

/* ─── Scroll animations ─── */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-up:nth-child(2) { transition-delay: 0.1s; }
.fade-in-up:nth-child(3) { transition-delay: 0.2s; }
.fade-in-up:nth-child(4) { transition-delay: 0.3s; }
.fade-in-up:nth-child(5) { transition-delay: 0.4s; }
.fade-in-up:nth-child(6) { transition-delay: 0.5s; }