/* ==========================================================================
   ELEVATED ROOFING PARTNERS — materials.css
   Roofing Materials Showcase Page Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. MATERIALS STICKY SUB-NAV
   -------------------------------------------------------------------------- */
.materials-nav {
  position: sticky;
  top: var(--nav-height);
  z-index: var(--z-above);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
}

@media (max-width: 767px) {
  .materials-nav {
    top: var(--nav-height-mobile);
  }
}

.materials-nav__inner {
  display: flex;
  align-items: stretch;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.materials-nav__link {
  display: flex;
  align-items: center;
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

@media (prefers-reduced-motion: no-preference) {
  .materials-nav__link {
    transition: color var(--transition-fast), border-color var(--transition-fast), opacity 0.25s ease;
  }
}

.materials-nav__link:hover {
  color: var(--color-gold);
}

.materials-nav__link.active {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
}

/* --------------------------------------------------------------------------
   2. MATERIAL SECTION — Alternating image/text rows
   -------------------------------------------------------------------------- */
.material-section {
  padding: var(--space-20) 0;
  border-bottom: 1px solid var(--color-border);
}

.material-section:last-of-type {
  border-bottom: none;
}

.material-section__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: center;
}

@media (min-width: 768px) {
  .material-section__split {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }
}

/* Reverse layout for alternating rows */
.material-section--reverse .material-section__split {
  direction: ltr;
}

@media (min-width: 768px) {
  .material-section--reverse .material-section__image {
    order: 2;
  }

  .material-section--reverse .material-section__content {
    order: 1;
  }
}

/* --------------------------------------------------------------------------
   3. MATERIAL IMAGE
   -------------------------------------------------------------------------- */
.material-section__image {
  position: relative;
  overflow: hidden;
}

.material-section__image .img-placeholder {
  min-height: 360px;
  width: 100%;
}

@media (min-width: 768px) {
  .material-section__image .img-placeholder {
    min-height: 440px;
  }
}

@media (max-width: 479px) {
  .material-section__image .img-placeholder {
    min-height: 260px;
  }
}

/* --------------------------------------------------------------------------
   4. MATERIAL CONTENT
   -------------------------------------------------------------------------- */
.material-section__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.material-section__kicker {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-gold);
}

/* Olive kicker for eco-friendly / synthetic materials */
.material-section__kicker--eco {
  color: var(--color-olive);
  border-color: var(--color-olive);
}

.material-section__content h2 {
  font-size: var(--text-4xl);
  line-height: 0.95;
  color: var(--color-charcoal);
}

@media (min-width: 768px) {
  .material-section__content h2 {
    font-size: var(--text-5xl);
  }
}

.material-section__content p {
  color: var(--color-text-secondary, #555);
  font-size: var(--text-base);
  line-height: 1.75;
  max-width: 520px;
}

/* --------------------------------------------------------------------------
   5. SPEC GRID — Technical specifications
   -------------------------------------------------------------------------- */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: 1px solid var(--color-border);
  margin-top: var(--space-6);
}

@media (min-width: 768px) {
  .spec-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.spec-item {
  padding: var(--space-5);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.spec-item:nth-child(2n) {
  border-right: none;
}

@media (min-width: 768px) {
  .spec-item:nth-child(2n) {
    border-right: 1px solid var(--color-border);
  }

  .spec-item:nth-child(3n) {
    border-right: none;
  }
}

.spec-item__label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.spec-item__value {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--color-gold);
  line-height: 1;
}

/* --------------------------------------------------------------------------
   6. MATERIAL OPTIONS — Sub-type cards within a material
   -------------------------------------------------------------------------- */
.material-options {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

@media (min-width: 768px) {
  .material-options {
    grid-template-columns: repeat(3, 1fr);
  }
}

.material-option {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (prefers-reduced-motion: no-preference) {
  .material-option {
    transition: border-color var(--transition-base);
  }

  .material-option:hover {
    border-color: var(--color-gold);
  }
}

.material-option .img-placeholder {
  min-height: 160px;
}

.material-option__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-lg);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-charcoal);
}

.material-option__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   7. COMPARISON TABLE
   -------------------------------------------------------------------------- */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-8);
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-4) var(--space-5);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.comparison-table th {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  background-color: var(--color-white);
  border-bottom: 2px solid var(--color-gold);
}

.comparison-table td {
  color: var(--color-text-primary);
  font-family: var(--font-body);
}

.comparison-table tr:hover td {
  background-color: rgba(197, 160, 89, 0.05);
}

.comparison-table__highlight {
  color: var(--color-gold);
  font-weight: 700;
}

/* Responsive: horizontal scroll on small screens */
.comparison-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 767px) {
  .comparison-table {
    min-width: 600px;
  }
}