/* Materials Page — Editorial layout for the 21 stones */

/* Hero */
.materials-hero {
  padding: 10rem var(--gutter) 6rem;
  text-align: center;
  background: var(--cream-light);
}
.materials-hero-inner {
  max-width: 700px;
  margin: 0 auto;
}
.materials-hero h1 {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 400;
  line-height: 1.05;
  margin: 1rem 0 1.5rem;
  color: var(--ink);
}
.materials-hero p {
  font-size: 1.125rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 460px;
  margin: 0 auto;
}

/* Intro */
.materials-intro {
  padding: 5rem var(--gutter);
  background: var(--cream);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.materials-intro .container {
  max-width: 720px;
  margin: 0 auto;
}
.materials-intro p {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink);
  margin-bottom: 1.5rem;
}
.materials-signature {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--accent);
  font-size: 1.125rem;
  margin-top: 2rem !important;
  text-align: right;
}

/* Filter */
.materials-filter {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding: 4rem var(--gutter) 2rem;
  background: var(--cream-light);
  position: sticky;
  top: 60px;
  z-index: 10;
  border-bottom: 1px solid var(--line);
}
.materials-filter-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 0.7rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s ease;
  border-radius: 0;
}
.materials-filter-btn span {
  margin-left: 0.5rem;
  font-size: 0.7rem;
  opacity: 0.5;
}
.materials-filter-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.materials-filter-btn.active {
  background: var(--ink);
  color: var(--cream-light);
  border-color: var(--ink);
}
.materials-filter-btn.active span {
  opacity: 0.7;
}

/* Grid */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 0;
  padding: 4rem var(--gutter) 6rem;
  background: var(--cream-light);
}

/* Stone Card */
.stone-card {
  background: var(--cream-light);
  border: 1px solid var(--line);
  padding: 3rem 2.5rem;
  margin: -1px;
  display: flex;
  flex-direction: column;
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.stone-card.hidden {
  display: none;
}
.stone-card:hover {
  background: var(--cream);
}

.stone-visual {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  margin: 0 auto 2rem;
  box-shadow:
    inset 0 -8px 16px rgba(0,0,0,0.1),
    inset 0 8px 16px rgba(255,255,255,0.3),
    0 4px 16px rgba(0,0,0,0.08);
  transition: transform 0.3s ease;
}
.stone-card:hover .stone-visual {
  transform: scale(1.05);
}

.stone-name-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.5rem;
  gap: 1rem;
}
.stone-name {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--ink);
  margin: 0;
  line-height: 1.2;
}
.stone-category {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.stone-latin {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-style: italic;
  color: var(--muted);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.stone-note {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink);
  margin-bottom: 0;
}
.stone-note-more {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.stone-note-more p {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink);
  margin: 1rem 0 0;
}
.stone-card.expanded .stone-note-more {
  max-height: 400px;
}

.stone-expand {
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  cursor: pointer;
  padding: 1rem 0;
  align-self: flex-start;
  transition: color 0.2s ease;
}
.stone-expand:hover {
  color: var(--ink);
}
.stone-card.expanded .stone-expand {
  display: none;
}

.stone-meta {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
.stone-meta-label {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}
.stone-pairs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.stone-pairs span {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 0.35rem 0.7rem;
  background: var(--cream);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 0;
}
.stone-pieces {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9375rem;
  color: var(--ink);
}
.stone-pieces-empty {
  color: var(--muted);
}

/* Summary */
.materials-summary {
  padding: 8rem var(--gutter);
  text-align: center;
  background: var(--cream);
  border-top: 1px solid var(--line);
}
.materials-summary h2 {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1.5rem;
}
.materials-summary p {
  max-width: 580px;
  margin: 0 auto 1.5rem;
  font-size: 1.0625rem;
  color: var(--muted);
  line-height: 1.8;
}
.cta-row {
  margin-top: 3rem !important;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Mobile */
@media (max-width: 768px) {
  .materials-hero { padding: 6rem var(--gutter) 4rem; }
  .materials-intro { padding: 3rem var(--gutter); }
  .materials-filter {
    padding: 2.5rem var(--gutter) 1.5rem;
    gap: 0.75rem;
  }
  .materials-filter-btn {
    padding: 0.55rem 1rem;
    font-size: 0.7rem;
  }
  .materials-grid {
    grid-template-columns: 1fr;
    padding: 2.5rem 0;
  }
  .stone-card {
    padding: 2.5rem 1.75rem;
  }
  .stone-visual {
    width: 90px;
    height: 90px;
  }
  .stone-name {
    font-size: 1.5rem;
  }
}