:root {
  --cg-bg: #ffffff;
  --cg-bg-alt: #f5f5f2;
  --cg-text: #1f2933;
  --cg-text-muted: #6b7280;
  --cg-accent: #111827;
  --cg-border-soft: #e4e1da;
  --cg-radius-lg: 20px;
  --cg-radius-xl: 26px;
  --cg-shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.12);
  --cg-transition-fast: 0.18s ease-out;
  --cg-container-width: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--cg-bg);
  color: var(--cg-text);
}

.cg-root {
  min-height: 100vh;
  background: radial-gradient(circle at top left, #fef9f3, #ffffff);
}

/* 공통 레이아웃 */

.cg-container {
  width: 100%;
  max-width: var(--cg-container-width);
  margin: 0 auto;
  padding: 0 16px;
}

/* 헤더 */

.cg-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.95),
    rgba(255, 255, 255, 0.8)
  );
  border-bottom: 1px solid rgba(209, 213, 219, 0.8);
}

.cg-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.cg-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cg-logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  background: radial-gradient(circle at top left, #4f46e5, #38bdf8);
  color: #f9fafb;
}

.cg-logo-text {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.cg-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.cg-nav-link {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6b7280;
  text-decoration: none;
  padding: 6px 8px;
  border-radius: 999px;
  transition: background-color var(--cg-transition-fast), color var(--cg-transition-fast),
    transform var(--cg-transition-fast);
}

.cg-nav-link:hover {
  background-color: rgba(17, 24, 39, 0.06);
  color: #111827;
  transform: translateY(-1px);
}

/* 모바일 메뉴 버튼 */

.cg-nav-toggle {
  display: none;
  border: none;
  background: transparent;
  font-size: 22px;
  cursor: pointer;
}

/* 히어로 */

.cg-hero {
  position: relative;
  padding: 56px 0 64px;
  background-image: url("https://images.unsplash.com/photo-1523580846011-d3a5bc25702b?auto=format&fit=crop&w=1600&q=80");
  /* 교실/스터디 느낌 배경 */
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.cg-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(255, 255, 255, 0.95),
    rgba(255, 255, 255, 0.85),
    rgba(255, 255, 255, 0.45)
  );
}

.cg-hero-inner {
  position: relative;
  z-index: 1;
}

.cg-hero-content {
  max-width: 540px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.cg-hero-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  font-size: 11px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid rgba(17, 24, 39, 0.2);
  background-color: rgba(255, 255, 255, 0.95);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #4b5563;
}

.cg-hero-title {
  margin: 0;
  font-size: clamp(30px, 3.3vw, 38px);
  line-height: 1.12;
  letter-spacing: -0.04em;
  color: #111827;
}

.cg-hero-subtitle {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cg-text-muted);
}

.cg-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.cg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 9px 18px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--cg-transition-fast), color var(--cg-transition-fast),
    box-shadow var(--cg-transition-fast), transform var(--cg-transition-fast),
    border-color var(--cg-transition-fast);
}

.cg-btn-primary {
  background-color: #111827;
  color: #f9fafb;
  box-shadow: var(--cg-shadow-soft);
}

.cg-btn-primary:hover {
  background-color: #020617;
  transform: translateY(-1px);
}

.cg-btn-secondary {
  background-color: #ffffff;
  border-color: rgba(148, 163, 184, 0.7);
  color: #111827;
}

.cg-btn-secondary:hover {
  background-color: #111827;
  color: #f9fafb;
}

.cg-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
  font-size: 11px;
  color: var(--cg-text-muted);
}

.cg-dot {
  opacity: 0.6;
}

/* 공통 섹션 */

.cg-section {
  padding: 52px 0 60px;
}

.cg-section-alt {
  background-color: var(--cg-bg-alt);
}

.cg-section-head {
  margin-bottom: 18px;
}

.cg-section-title {
  margin: 0 0 6px;
  font-size: 22px;
  letter-spacing: -0.03em;
}

.cg-section-subtitle {
  margin: 0;
  font-size: 13px;
  color: var(--cg-text-muted);
}

/* 필터 바 (디자인용) */

.cg-filter-bar {
  margin-top: 18px;
  margin-bottom: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.cg-filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cg-filter-tab {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 6px 11px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background-color: transparent;
  color: #6b7280;
  cursor: default; /* 기능 없음 표시 */
}

.cg-filter-tab-active {
  background-color: #111827;
  color: #f9fafb;
  border-color: #111827;
}

.cg-filter-meta {
  font-size: 11px;
  color: #9ca3af;
}

/* 카드 그리드 */

.cg-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.cg-card {
  border-radius: var(--cg-radius-lg);
  border: 1px solid var(--cg-border-soft);
  background-color: #ffffff;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--cg-transition-fast), box-shadow var(--cg-transition-fast),
    border-color var(--cg-transition-fast);
}

.cg-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--cg-shadow-soft);
  border-color: rgba(17, 24, 39, 0.12);
}

/* 카드 이미지 영역 */

.cg-card-image {
  position: relative;
  padding-top: 68%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* 각 카드별 배경 이미지 (Unsplash, 교육/오피스/작업 느낌) */
.cg-card-image-1 {
  background-image: url("https://images.unsplash.com/photo-1516245834210-c4c142787335?auto=format&fit=crop&w=900&q=80");
}

.cg-card-image-2 {
  background-image: url("https://images.unsplash.com/photo-1522202176988-66273c2fd55f?auto=format&fit=crop&w=900&q=80");
}

.cg-card-image-3 {
  background-image: url("https://images.unsplash.com/photo-1582719478250-c89cae4dc85b?auto=format&fit=crop&w=900&q=80");
}

.cg-card-image-4 {
  background-image: url("https://images.unsplash.com/photo-1518770660439-4636190af475?auto=format&fit=crop&w=900&q=80");
}

.cg-card-image-5 {
  background-image: url("https://images.unsplash.com/photo-1521737604893-d14cc237f11d?auto=format&fit=crop&w=900&q=80");
}

.cg-card-image-6 {
  background-image: url("https://images.unsplash.com/photo-1517245386807-bb43f82c33c4?auto=format&fit=crop&w=900&q=80");
}

.cg-card-tag {
  position: absolute;
  left: 10px;
  top: 10px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 4px 9px;
  border-radius: 999px;
  background-color: #111827;
  color: #f9fafb;
}

.cg-card-tag-muted {
  background-color: rgba(17, 24, 39, 0.8);
}

/* 카드 본문 */

.cg-card-body {
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cg-card-name {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
}

.cg-card-desc {
  margin: 0;
  font-size: 12px;
  color: var(--cg-text-muted);
  line-height: 1.6;
}

.cg-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 6px;
  font-size: 11px;
  color: #6b7280;
}

.cg-card-label-sub {
  font-size: 11px;
  color: #9ca3af;
}

/* ABOUT / METHOD 섹션 */

.cg-about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 24px;
  align-items: flex-start;
}

.cg-about-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.cg-about-card {
  border-radius: 18px;
  border: 1px solid #e5e7eb;
  background-color: #ffffff;
  padding: 14px 14px 16px;
}

.cg-about-card h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.cg-about-card p {
  margin: 0;
  font-size: 12px;
  color: var(--cg-text-muted);
  line-height: 1.6;
}

/* CONTACT 블록 */

.cg-contact-title {
  margin: 0 0 8px;
  font-size: 16px;
}

.cg-contact-list {
  margin: 0 0 10px;
  padding-left: 18px;
  font-size: 13px;
  color: var(--cg-text-muted);
}

.cg-contact-list li {
  margin-bottom: 4px;
}

.cg-contact-note {
  margin: 0;
  font-size: 12px;
  color: #9ca3af;
  line-height: 1.6;
}

/* 푸터 */

.cg-footer {
  border-top: 1px solid rgba(209, 213, 219, 0.8);
  padding: 16px 0 20px;
  background-color: #f9fafb;
}

.cg-footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  font-size: 11px;
  color: #6b7280;
}

.cg-footer-brand,
.cg-footer-meta {
  margin: 0;
}

/* 반응형 */

.cg-only-desktop {
  display: inline;
}

@media (max-width: 960px) {
  .cg-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cg-about-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 720px) {
  .cg-header-inner {
    height: 60px;
  }

  .cg-nav {
    display: none;
  }

  .cg-nav-toggle {
    display: block;
  }

  .cg-hero {
    padding: 40px 0 44px;
  }

  .cg-section {
    padding: 40px 0 48px;
  }

  .cg-section-title {
    font-size: 20px;
  }

  .cg-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .cg-only-desktop {
    display: none;
  }
}