body { background: #FAFAF9; color: #1a1a1a; font-family: var(--font-sans); }

.site-header {
  background: #fff;
  border-bottom: 1px solid #E8E8E6;
  padding: 18px 32px;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 100;
}
.site-header .brandmark-name, .site-header .brandmark-sub { font-family: var(--font-serif); }
.site-header .brandmark-name { color: #1a1a1a; }
.site-header .brandmark-sub { color: #94908B; }
.header-caption { font-family: var(--font-mono); font-size: 12px; color: #777; letter-spacing: -0.005em; }

.page-wrap { max-width: 920px; margin: 0 auto; padding: 56px 24px 80px; }

.welcome-block { margin-bottom: 56px; }
.welcome-block h1 { font-family: var(--font-serif); font-size: clamp(36px, 5.5vw, 52px); font-weight: 500; color: #1a1a1a; line-height: 1.1; letter-spacing: -0.015em; margin-bottom: 20px; }
.welcome-block p { font-size: 17px; color: #444; line-height: 1.7; max-width: 640px; }

/* ───── Concept cards ───── */
.concepts-section { margin-bottom: 64px; }
.concept-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
@media (max-width: 720px) { .concept-cards { grid-template-columns: 1fr; } }

.concept-card {
  background: #fff;
  border-radius: 20px;
  border: 1px solid #E8E8E6;
  padding: 36px 32px 32px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03), 0 8px 24px rgba(0,0,0,0.04);
  display: flex; flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.concept-card:hover { transform: translateY(-3px); box-shadow: 0 2px 6px rgba(0,0,0,0.04), 0 14px 32px rgba(0,0,0,0.07); border-color: #D8D8D5; }

/* Header block — labels, name, tagline */
.concept-card-header {
  padding-bottom: 28px;
  margin-bottom: 28px;
  border-bottom: 1px solid #EFEFED;
}
.concept-card-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: #999;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.concept-card-name {
  font-size: 38px;
  line-height: 1;
  margin-bottom: 14px;
}
.hearth-name { font-family: var(--font-serif); font-weight: 500; color: #C67B5C; font-style: italic; letter-spacing: -0.01em; }
.atrium-name { font-family: var(--font-sans); font-weight: 700; color: #2B6CB0; letter-spacing: -0.035em; }
.concept-card-tagline {
  font-size: 14px;
  color: #666;
  line-height: 1.55;
  max-width: 320px;
}

/* Sections inside card */
.concept-card-section { margin-bottom: 24px; }
.concept-card-section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: #aaa;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.palette-swatches { display: flex; gap: 8px; }
.swatch { width: 36px; height: 36px; border-radius: 50%; border: 1.5px solid rgba(0,0,0,0.08); }

.type-specimen { padding: 18px 20px; border-radius: 12px; background: #F4F4F2; border: 1px solid #E5E5E3; }
.type-specimen .specimen-text { font-size: 28px; line-height: 1.1; }
.type-specimen .specimen-sub { font-family: var(--font-mono); font-size: 10px; color: #888; margin-top: 8px; letter-spacing: 0.04em; text-transform: uppercase; }
.hearth-specimen-text { font-family: var(--font-serif); color: #1a1a1a; font-weight: 500; letter-spacing: -0.01em; }
.atrium-specimen-text { font-family: var(--font-sans); color: #1a1a1a; font-weight: 700; letter-spacing: -0.035em; }

.btn-explore {
  margin-top: 8px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 22px;
  border-radius: 12px;
  font-family: var(--font-sans);
  font-size: 15px; font-weight: 600;
  background: #1a1a1a; color: #fff;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  letter-spacing: -0.005em;
}
.btn-explore span { font-size: 18px; line-height: 1; transition: transform 0.15s; }
.btn-explore:hover { background: #2a2a2a; }
.btn-explore:hover span { transform: translateX(3px); }
.btn-explore:active { transform: scale(0.98); }

.dna-link { display: flex; justify-content: center; width: 100%; max-width: none; margin-top: 44px; }
.dna-link a {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 16px 32px; border-radius: 12px;
  font-family: var(--font-sans); font-size: 15px; font-weight: 600;
  background: #4F5D75; color: #fff; letter-spacing: -0.005em;
  text-decoration: none; cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.dna-link a span { font-size: 18px; line-height: 1; transition: transform 0.15s; }
.dna-link a:hover { background: #404c61; transform: translateY(-1px); }
.dna-link a:hover span { transform: translateX(3px); }
.dna-link a:active { transform: scale(0.99); }

.site-footer { border-top: 1px solid #E8E8E6; padding: 24px 32px; text-align: center; font-family: var(--font-mono); font-size: 11px; color: #888; letter-spacing: 0.04em; }