/* Breadcrumb Navigation */
.breadcrumb-nav {
  padding: 12px 0;
  background: transparent;
}
.breadcrumb-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
  color: #94a3b8;
}
.breadcrumb-list a {
  color: #64748b;
  text-decoration: none;
}
.breadcrumb-list a:hover { color: #1A365D; }
.breadcrumb-list .current { color: #1A365D; font-weight: 600; }

/* =====================================================
   Product Compact CSS - Modern Tone + Changho Structure
   LearnToday EdTech Partner Pages

   이중 톤 시스템: 모던 (제품 페이지)
   - 배경: 흰색 (#FFFFFF)
   - 액센트: 네이비 (#1a365d)
   - 카드: 흰색 + 미세 border
   - 폰트: Noto Sans KR
   - 구조: 창호 radius/shadow/spacing 공유
   ===================================================== */

/* =====================================================
   CSS Reset & Base - Modern Clean Design
   ===================================================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans, 'Noto Sans KR'), -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--modern-bg, #FFFFFF);
  min-height: 100vh;
  color: var(--modern-text, #1E293B);
  line-height: 1.6;
  overflow-x: hidden;
}
.container { max-width: var(--section-max-width, 1200px); margin: 0 auto; padding: 0 24px; }

/* =====================================================
   Header - Overridden by header.css (kept for fallback)
   ===================================================== */
.header {
  position: fixed; top: 16px; left: 50%; transform: translateX(-50%);
  width: calc(100% - 48px); max-width: 1200px; z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: var(--modern-card-border, 1px solid #E2E8F0);
  border-radius: var(--changho-card-radius, 12px);
  box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08));
  padding: 0 32px;
}
.header-container { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: flex; align-items: center; text-decoration: none; overflow: hidden; height: 5rem; }
.logo img { height: 15rem; width: auto; max-width: 900px; object-fit: cover; object-position: center; }
.nav-menu { display: flex; align-items: center; gap: 12px; }
.nav-menu > a { padding: 12px 20px; color: var(--modern-text-secondary, #64748B); text-decoration: none; font-weight: 500; font-size: 1.1rem; border-radius: var(--changho-btn-radius, 8px); transition: all 0.3s ease; }
.nav-menu > a:hover { background: rgba(26, 54, 93, 0.06); color: var(--changho-accent, #1a365d); }
.dropdown { position: relative; }
.dropdown-toggle { padding: 12px 20px; background: transparent; border: none; color: var(--modern-text-secondary, #64748B); font-weight: 500; font-size: 1.1rem; border-radius: var(--changho-btn-radius, 8px); cursor: pointer; transition: all 0.3s ease; font-family: inherit; }
.dropdown-toggle:hover { background: rgba(26, 54, 93, 0.06); color: var(--changho-accent, #1a365d); }
.dropdown-content { position: absolute; top: calc(100% + 12px); left: 50%; transform: translateX(-50%) translateY(10px); background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1); padding: 8px; min-width: 260px; opacity: 0; visibility: hidden; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); z-index: 1001; }
.dropdown:hover .dropdown-content { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.dropdown-content a { display: block; padding: 12px 16px; color: var(--modern-text, #1E293B); text-decoration: none; border-radius: var(--changho-btn-radius, 8px); font-size: 0.95rem; transition: all 0.2s ease; }
.dropdown-content a:hover { background: var(--changho-accent, #1a365d); color: white; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-toggle { display: flex; align-items: center; gap: 6px; padding: 10px 16px; background: rgba(26, 54, 93, 0.06); border: none; border-radius: var(--changho-btn-radius, 8px); color: var(--changho-accent, #1a365d); font-weight: 500; cursor: pointer; transition: all 0.3s ease; }
.lang-toggle:hover { background: rgba(26, 54, 93, 0.12); }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; padding: 10px; background: transparent; border: none; cursor: pointer; }
.mobile-toggle span { width: 24px; height: 2px; background: var(--modern-text-secondary, #64748B); border-radius: 2px; transition: all 0.3s ease; }
.mobile-menu-content { display: none; position: fixed; top: 100px; left: 24px; right: 24px; background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); padding: 16px; box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1); z-index: 999; }
.mobile-menu-content.active { display: block; max-height: calc(100vh - 120px); overflow-y: auto; -webkit-overflow-scrolling: touch; }
.mobile-nav-menu { display: flex; flex-direction: column; gap: 8px; }
.mobile-nav-menu a { padding: 12px 16px; color: var(--modern-text, #1E293B); text-decoration: none; border-radius: var(--changho-btn-radius, 8px); font-weight: 500; transition: all 0.2s ease; }
.mobile-nav-menu a:hover { background: rgba(26, 54, 93, 0.06); color: var(--changho-accent, #1a365d); }
.mobile-dropdown-toggle { width: 100%; text-align: left; padding: 12px 16px; background: transparent; border: none; color: var(--modern-text, #1E293B); font-weight: 500; cursor: pointer; border-radius: var(--changho-btn-radius, 8px); font-size: 1rem; font-family: inherit; display: flex; justify-content: space-between; align-items: center; }
.mobile-dropdown-toggle::after { content: '▾'; font-size: 0.75rem; transition: transform 0.2s ease; color: #94A3B8; }
.mobile-dropdown-toggle[aria-expanded="true"]::after { transform: rotate(180deg); }
.mobile-dropdown-content { display: none; padding-left: 16px; }
.mobile-dropdown-content.active { display: block; }

/* =====================================================
   Hero Section
   ===================================================== */
.hero { padding: 160px 0 80px; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-content h1 { font-size: 3.5rem; font-weight: 800; line-height: 1.1; margin-bottom: 24px; color: var(--changho-accent, #1a365d); }
.hero-content p { font-size: 1.25rem; color: var(--modern-text-secondary, #64748B); margin-bottom: 32px; line-height: 1.7; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary { display: inline-flex; align-items: center; gap: 8px; padding: 16px 32px; background: var(--changho-btn-primary-bg, #1a365d); color: var(--changho-btn-primary-text, #FFFFFF); text-decoration: none; border-radius: var(--changho-card-radius, 12px); font-weight: 600; font-size: 1.05rem; box-shadow: 0 4px 16px rgba(26, 54, 93, 0.25); transition: all 0.3s ease; }
.btn-primary:hover { background: var(--changho-btn-primary-hover, #0f2442); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26, 54, 93, 0.3); }
.btn-secondary { display: inline-flex; align-items: center; gap: 8px; padding: 16px 32px; background: #FFFFFF; color: var(--changho-accent, #1a365d); text-decoration: none; border-radius: var(--changho-card-radius, 12px); font-weight: 600; font-size: 1.05rem; border: var(--modern-card-border, 1px solid #E2E8F0); transition: all 0.3s ease; }
.btn-secondary:hover { background: var(--modern-section-alt, #F8FAFC); transform: translateY(-2px); box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08)); }
.hero-card { background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); padding: 40px; box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08)); }
.hero-card-logo { text-align: center; margin-bottom: 32px; }
.hero-card-logo img { width: 120px; height: 120px; object-fit: contain; border-radius: var(--changho-card-radius, 12px); box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08)); }
.hero-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.stat-card { background: var(--modern-section-alt, #F8FAFC); border-radius: var(--changho-card-radius, 12px); padding: 20px; text-align: center; border: var(--modern-card-border, 1px solid #E2E8F0); }
.stat-card h3 { font-size: 1.8rem; font-weight: 800; color: var(--changho-accent, #1a365d); margin-bottom: 4px; }
.stat-card p { font-size: 0.9rem; color: var(--modern-text-secondary, #64748B); }

/* =====================================================
   Features Section
   ===================================================== */
.features { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 2.5rem; font-weight: 800; color: var(--modern-text, #1E293B); margin-bottom: 16px; }
.section-header p { font-size: 1.15rem; color: var(--modern-text-secondary, #64748B); max-width: 600px; margin: 0 auto; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); padding: 32px; box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08)); transition: all 0.3s ease; }
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(26, 54, 93, 0.12); }
.feature-icon { width: 56px; height: 56px; background: var(--changho-accent, #1a365d); border-radius: var(--changho-card-radius, 12px); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 20px; }
.feature-card h3 { font-size: 1.25rem; font-weight: 700; color: var(--modern-text, #1E293B); margin-bottom: 12px; }
.feature-card p { font-size: 0.95rem; color: var(--modern-text-secondary, #64748B); line-height: 1.6; }

/* =====================================================
   Use Cases Section
   ===================================================== */
.use-cases { padding: 80px 0; background: var(--modern-section-alt, #F8FAFC); border-radius: 24px; margin: 40px 24px; }
.use-cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.use-case-card { background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); padding: 32px; box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08)); transition: all 0.3s ease; }
.use-case-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(26, 54, 93, 0.12); }
.use-case-icon { font-size: 2.5rem; margin-bottom: 16px; }
.use-case-card h3 { font-size: 1.2rem; font-weight: 700; color: var(--modern-text, #1E293B); margin-bottom: 12px; }
.use-case-card p { font-size: 0.95rem; color: var(--modern-text-secondary, #64748B); line-height: 1.6; }

/* =====================================================
   Pricing Section
   ===================================================== */
.pricing { padding: 80px 0; }
.pricing-card { background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); padding: 48px; box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08)); max-width: 900px; margin: 0 auto; }
.pricing-header { text-align: center; margin-bottom: 40px; }
.pricing-header h3 { font-size: 1.8rem; font-weight: 700; color: var(--modern-text, #1E293B); margin-bottom: 8px; }
.pricing-header p { font-size: 1rem; color: var(--modern-text-secondary, #64748B); }
.pricing-tiers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 32px; }
.tier-card { background: var(--modern-section-alt, #F8FAFC); border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); padding: 20px 16px; text-align: center; transition: all 0.3s ease; }
.tier-card:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(26, 54, 93, 0.12); }
.tier-card .segment { font-size: 0.85rem; color: var(--modern-text-secondary, #64748B); margin-bottom: 8px; }
.tier-card .amount { font-size: 1.3rem; font-weight: 800; color: var(--changho-accent, #1a365d); }
.tier-card .meta { font-size: 0.8rem; color: var(--modern-text-muted, #94A3B8); }
.pricing-features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-bottom: 32px; }
.pricing-feature { display: flex; align-items: center; gap: 10px; font-size: 0.95rem; color: var(--modern-text, #1E293B); }
.pricing-feature::before { content: '✓'; color: var(--changho-accent, #1a365d); font-weight: 700; }
.pricing-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-cta { display: inline-flex; align-items: center; gap: 8px; padding: 16px 32px; background: var(--changho-btn-primary-bg, #1a365d); color: var(--changho-btn-primary-text, #FFFFFF); text-decoration: none; border-radius: var(--changho-card-radius, 12px); font-weight: 600; font-size: 1.05rem; box-shadow: 0 4px 16px rgba(26, 54, 93, 0.25); transition: all 0.3s ease; }
.btn-cta:hover { background: var(--changho-btn-primary-hover, #0f2442); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26, 54, 93, 0.3); }

/* =====================================================
   CTA Section
   ===================================================== */
.cta { padding: 80px 0; margin: 40px 24px; background: var(--changho-accent, #1a365d); border-radius: var(--changho-card-radius, 12px); text-align: center; }
.cta h2 { font-size: 2.5rem; font-weight: 800; color: white; margin-bottom: 16px; }
.cta p { font-size: 1.15rem; color: rgba(255, 255, 255, 0.85); margin-bottom: 32px; max-width: 600px; margin-left: auto; margin-right: auto; }
.cta .btn-white { display: inline-flex; align-items: center; gap: 8px; padding: 16px 32px; background: white; color: var(--changho-accent, #1a365d); text-decoration: none; border-radius: var(--changho-card-radius, 12px); font-weight: 600; font-size: 1.05rem; box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15); transition: all 0.3s ease; }
.cta .btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2); }

/* =====================================================
   Footer Section
   ===================================================== */
.footer { padding: 80px 0 40px; }
.footer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 48px; }
.footer-card { background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-card-radius, 12px); padding: 32px; box-shadow: var(--changho-card-shadow, 0 2px 12px rgba(26, 54, 93, 0.08)); }
.footer-card h3 { font-size: 1.5rem; font-weight: 700; color: var(--modern-text, #1E293B); margin-bottom: 8px; }
.footer-card .tagline { font-size: 1rem; color: var(--modern-text-secondary, #64748B); margin-bottom: 24px; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-item .label { font-size: 0.75rem; font-weight: 600; color: var(--changho-accent, #1a365d); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.contact-item .value { font-size: 0.95rem; color: var(--modern-text, #1E293B); font-weight: 500; }
.contact-item a { color: var(--modern-text, #1E293B); text-decoration: none; transition: color 0.2s ease; }
.contact-item a:hover { color: var(--changho-accent, #1a365d); }
.footer-card h4 { font-size: 1.2rem; font-weight: 700; color: var(--modern-text, #1E293B); margin-bottom: 8px; }
.footer-card .desc { font-size: 0.95rem; color: var(--modern-text-secondary, #64748B); margin-bottom: 20px; }
.newsletter-form { display: flex; flex-direction: column; gap: 12px; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--modern-text, #1E293B); }
.form-group input { width: 100%; padding: 12px 16px; background: #FFFFFF; border: var(--modern-card-border, 1px solid #E2E8F0); border-radius: var(--changho-btn-radius, 8px); font-size: 0.95rem; color: var(--modern-text, #1E293B); transition: all 0.2s ease; }
.form-group input:focus { outline: none; border-color: var(--changho-accent, #1a365d); box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1); }
.newsletter-btn { padding: 14px 24px; background: var(--changho-btn-primary-bg, #1a365d); color: var(--changho-btn-primary-text, #FFFFFF); border: none; border-radius: var(--changho-btn-radius, 8px); font-weight: 600; cursor: pointer; transition: all 0.3s ease; }
.newsletter-btn:hover { background: var(--changho-btn-primary-hover, #0f2442); transform: translateY(-2px); box-shadow: 0 4px 16px rgba(26, 54, 93, 0.25); }
.company-info { display: flex; flex-direction: column; gap: 16px; }
.info-item .label { font-size: 0.75rem; font-weight: 600; color: var(--changho-accent, #1a365d); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.info-item .value { font-size: 0.95rem; color: var(--modern-text, #1E293B); font-weight: 500; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding-top: 32px; border-top: 1px solid var(--modern-divider, #E2E8F0); }
.footer-bottom p { font-size: 0.9rem; color: var(--modern-text-secondary, #64748B); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 0.9rem; color: var(--changho-accent, #1a365d); text-decoration: none; font-weight: 500; transition: color 0.2s ease; }
.footer-links a:hover { color: var(--changho-btn-primary-hover, #0f2442); }

/* =====================================================
   Changho Structure — 창호 구조 요소
   product-compact 페이지에 창호 격자/프레임/디바이더 적용
   ===================================================== */

/* Hero — 한지 투과광 (changho-hanji-glow 클래스가 HTML에 있을 때 활성화) */
.hero.changho-hanji-glow { position: relative; overflow: hidden; }
.hero.changho-hanji-glow::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 600px 400px at var(--glow-x, 50%) var(--glow-y, 30%),
    rgba(255, 255, 255, 0.5) 0%,
    rgba(248, 250, 252, 0.2) 40%,
    transparent 70%
  );
  pointer-events: none;
  mix-blend-mode: soft-light;
  z-index: 1;
  transition: opacity 0.6s var(--changho-ease, cubic-bezier(0.25, 1, 0.5, 1));
}

/* Hero Card — 창호 프레임 (frame-thick) */
.hero-card {
  border: 3px solid var(--changho-wood, #475569) !important;
  box-shadow:
    inset 0 1px 0 var(--changho-wood-light, #94A3B8),
    inset 0 -1px 0 var(--changho-wood-dark, #334155),
    0 8px 32px rgba(71, 85, 105, 0.12) !important;
  border-radius: 6px !important;
}

/* Features Grid — 창호 격자 (lattice-grid) */
.features-grid {
  gap: 3px;
  border: 3px solid var(--changho-wood, #475569);
  border-radius: 6px;
  overflow: hidden;
  background: var(--changho-wood, #475569);
}
.feature-card {
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  background: var(--changho-paper-light, #FFFFFF);
}
.feature-card:hover {
  transform: none;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: inset 0 0 30px rgba(248, 250, 252, 0.8) !important;
}

/* Feature Card — 문 열림 효과 (door-card) */
.feature-card {
  perspective: 800px;
  cursor: pointer;
}
.feature-card > * {
  transition: transform 0.4s var(--changho-ease, cubic-bezier(0.25, 1, 0.5, 1));
}
.feature-card:hover > * {
  transform: rotateY(-3deg);
  transform-origin: left center;
}

/* Section 사이 디바이더 자동 삽입 */
.section + .section::before {
  content: '';
  display: block;
  height: 3px;
  max-width: 85%;
  margin: 0 auto 60px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--changho-wood-light, #94A3B8) 15%,
    var(--changho-wood, #475569) 50%,
    var(--changho-wood-light, #94A3B8) 85%,
    transparent 100%
  );
  position: relative;
}

/* AI Section — 창호 프레임 래핑 */
.ai-section {
  border: 3px solid var(--changho-wood, #475569);
  border-radius: 6px;
  box-shadow:
    inset 0 1px 0 rgba(148, 163, 184, 0.3),
    0 8px 32px rgba(71, 85, 105, 0.12);
}

/* Pricing Card — 미닫이 느낌 */
.tier-card {
  perspective: 600px;
}
.tier-card:hover {
  transform: translateY(-4px) rotateY(-2deg);
  border-color: var(--changho-wood, #475569);
}

/* Section Reveal 애니메이션 */
.section.changho-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.section.changho-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Use Cases Grid — 격자 스타일 */
.use-cases-grid {
  gap: 3px;
  border: 3px solid var(--changho-wood, #475569);
  border-radius: 6px;
  overflow: hidden;
  background: var(--changho-wood, #475569);
}
.use-case-card {
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  background: var(--changho-paper-light, #FFFFFF);
  perspective: 800px;
}
.use-case-card:hover {
  transform: none;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: inset 0 0 30px rgba(248, 250, 252, 0.8) !important;
}

/* Footer Grid — 창호 격자 */
.footer-grid {
  gap: 3px;
  border: 3px solid var(--changho-wood, #475569);
  border-radius: 6px;
  overflow: hidden;
  background: var(--changho-wood, #475569);
}
.footer-card {
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  background: var(--changho-paper-light, #FFFFFF);
}

/* =====================================================
   Responsive Design
   ===================================================== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-content h1 { font-size: 2.5rem; }
  .features-grid, .use-cases-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-tiers { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .header { width: calc(100% - 32px); padding: 0 16px; top: 8px; }
  .nav-menu { display: none; }
  .mobile-toggle { display: flex; }
  .hero { padding: 120px 0 60px; }
  .hero-content h1 { font-size: 2rem; }
  .hero-buttons { flex-direction: column; }
  .features-grid, .use-cases-grid { grid-template-columns: 1fr; }
  .pricing-features { grid-template-columns: 1fr; }
  .cta { margin: 24px 16px; padding: 60px 24px; }
  .cta h2 { font-size: 1.8rem; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .footer-links { flex-direction: column; gap: 12px; }
  /* 모바일 door-card 효과 비활성 */
  .feature-card:hover > *, .use-case-card:hover > * { transform: none; }
  /* 디바이더 폭 축소 */
  .section + .section::before { max-width: 60%; }
}

/* ── FAQ Section ── */
.faq-section {
  padding: 60px 0;
  background: #f8fafc;
}

.faq-section h2 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 1.8rem;
  color: var(--text-primary, #1e293b);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid #e2e8f0;
}

.faq-item summary {
  padding: 20px 0;
  font-weight: 600;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text-primary, #1e293b);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--changho-accent, #1a365d);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item p {
  padding: 0 0 20px;
  color: #64748b;
  line-height: 1.7;
  margin: 0;
}

@media (max-width: 768px) {
  .faq-section {
    padding: 40px 20px;
  }

  .faq-item summary {
    font-size: 1rem;
    padding: 16px 0;
  }
}