/* ============================================
   TIBA STONE — PRODUCT PAGE STYLES
   Header (solid), product hero, gallery strip,
   editorial split, materials, specs, advice,
   FAQ, related products, inquiry, footer theme
============================================ */

/* ============================================
   1. HEADER (Product pages — solid background)
============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.625rem 0;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(34, 35, 35, 0.08);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: padding var(--duration-fast) var(--ease-smooth);
}

.site-header.is-scrolled {
  padding: 1.125rem 0;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo { position: relative; z-index: 2; flex-shrink: 0; }

.header__logo-img {
  height: 44px;
  width: auto;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 2.75rem;
}

.header__nav-link {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--ls-medium);
  color: var(--color-stone);
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--duration-fast) var(--ease-smooth);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-sunset);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--duration-fast) var(--ease-smooth);
}

.header__nav-link:hover::after,
.header__nav-link--active::after { transform: scaleX(1); }

.header__hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 0.5rem;
  z-index: 2;
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-stone);
  transition: background var(--duration-fast) var(--ease-smooth);
}

/* ============================================
   2. PRODUCT HERO
============================================ */
.product-hero {
  padding-top: 80px;
  display: grid;
  grid-template-columns: 0.38fr 0.62fr;
  min-height: 100vh;
}

.product-hero__info {
  background: var(--color-warm-bg);
  padding: clamp(2.5rem, 5vh, 4rem) clamp(2rem, 3.5vw, 3.5rem);
  display: flex;
  flex-direction: column;
}

.product-hero__back {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--ls-medium);
  text-transform: uppercase;
  color: var(--color-river-green);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--duration-fast) var(--ease-smooth);
}

.product-hero__back:hover { color: var(--color-stone); }

.product-hero__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(3rem, 8vh, 6rem) 0 clamp(2rem, 4vh, 3rem);
}

.product-hero__category {
  font-family: var(--font-body);
  font-size: var(--text-subtitle);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  margin-bottom: 1.25rem;
}

.product-hero__title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 6vw, 5.5rem);
  line-height: 1.0;
  color: var(--color-stone);
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}

.product-hero__subtitle {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-body);
  color: var(--color-river-green);
  margin-bottom: 0;
}

.product-hero__rule {
  width: 48px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-sunset) 15%, var(--color-sunset) 85%, transparent);
  margin: 1.75rem 0;
}

.product-hero__description {
  font-size: var(--text-body);
  line-height: var(--lh-body);
  color: var(--color-stone);
  max-width: 340px;
  margin-bottom: 2.5rem;
}

.hero-thumb {
  width: 56px;
  height: 56px;
  object-fit: cover;
  cursor: pointer;
  opacity: 0.45;
  transition: opacity var(--duration-fast) var(--ease-smooth),
              outline-color var(--duration-fast) var(--ease-smooth);
  outline: 1.5px solid transparent;
  outline-offset: 2px;
}

.hero-thumb:hover { opacity: 0.8; }

.hero-thumb.is-active {
  opacity: 1;
  outline-color: var(--color-stone);
}

.product-hero__media {
  position: relative;
  overflow: hidden;
  background: #D0CBC3;
}

.product-hero__img {
  width: 100%;
  height: 100%;
  min-height: calc(100vh - 80px);
  object-fit: cover;
  object-position: center;
  transition: opacity 0.6s ease;
}

/* ============================================
   3. GALLERY STRIP — 4-column portrait strip
============================================ */
.gallery-strip {
  background: var(--color-sand);
  padding: 0;
}

.gallery-strip__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}

.gallery-strip__item {
  overflow: hidden;
  position: relative;
}

.gallery-strip__img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.gallery-strip__item:hover .gallery-strip__img {
  transform: scale(1.04);
}

/* ============================================
   4. EDITORIAL SPLIT
============================================ */
.editorial-split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--grid-gap);
  align-items: start;
}

.editorial-split__media { overflow: hidden; }

.editorial-split__img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.editorial-split__media:hover .editorial-split__img { transform: scale(1.03); }

.editorial-split__content {
  padding-top: clamp(3rem, 8vw, 7rem);
  padding-left: clamp(1rem, 3vw, 2.5rem);
}

.editorial-split__label {
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  display: block;
  margin-bottom: 1.25rem;
}

.editorial-split__heading {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  line-height: var(--lh-heading);
  margin-bottom: 1.5rem;
}

.editorial-split__text {
  font-weight: 400;
  line-height: var(--lh-body);
  margin-bottom: 2rem;
  max-width: 420px;
}

/* Reversed */
.editorial-split--img-right {
  grid-template-columns: 0.85fr 1.15fr;
}

.editorial-split--img-right .editorial-split__media { order: 2; }

.editorial-split--img-right .editorial-split__content {
  order: 1;
  padding-left: 0;
  padding-right: clamp(1rem, 3vw, 2.5rem);
}

/* Full-bleed variant */
.editorial-split--full-bleed {
  grid-template-columns: 56vw 1fr;
  gap: 0;
  min-height: 72vh;
  align-items: stretch;
}

.editorial-split--full-bleed .editorial-split__media { overflow: hidden; }

.editorial-split--full-bleed .editorial-split__img {
  aspect-ratio: unset;
  height: 100%;
  min-height: 72vh;
  width: 100%;
  object-fit: cover;
}

.editorial-split--full-bleed .editorial-split__content {
  padding: clamp(3rem, 5vw, 5.5rem) clamp(2.5rem, 4vw, 5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.editorial-split--full-bleed .editorial-split__content .btn-primary,
.editorial-split--full-bleed .editorial-split__content .btn-secondary {
  align-self: flex-start;
}

/* Full-bleed image right */
.editorial-split--full-bleed.editorial-split--img-right {
  grid-template-columns: 1fr 56vw;
}

.editorial-split--full-bleed.editorial-split--img-right .editorial-split__content {
  padding: clamp(3rem, 5vw, 5.5rem) clamp(2.5rem, 4vw, 5rem);
  padding-left: clamp(3rem, 5vw, 6rem);
}

/* ============================================
   5. MATERIALS SECTION
============================================ */
.materials-section {
  padding: var(--space-2xl) 0;
  background: var(--color-sand);
}

.materials__inner {
  display: grid;
  grid-template-columns: 0.55fr 0.45fr;
  gap: var(--space-xl);
  align-items: center;
}

.materials__media { overflow: hidden; }

.materials__media img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.materials__media:hover img { transform: scale(1.03); }

.materials__content { padding: var(--space-md) 0; }

.materials__label {
  font-family: var(--font-body);
  font-size: var(--text-subtitle);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  display: block;
  margin-bottom: 0.75rem;
}

.materials__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  margin-bottom: 1.25rem;
}

.materials__text {
  font-weight: 400;
  line-height: var(--lh-body);
  margin-bottom: var(--space-md);
  max-width: 400px;
}

.materials__swatches {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.swatch { text-align: center; cursor: pointer; display: inline-flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.swatch:hover .swatch__img { filter: brightness(0.94) saturate(0.9); }
.swatch.is-active .swatch__img { filter: brightness(1) saturate(1); box-shadow: 0 3px 0 0 var(--color-sunset); outline: none; }
.swatch__img { width: 72px; height: 96px; object-fit: cover; margin-bottom: 0; display: block; filter: brightness(0.88) saturate(0.75); transition: filter 0.45s ease, box-shadow 0.35s var(--ease-spring); }
.swatch__name { font-size: 0.5625rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--color-river-green); line-height: 1.3; font-weight: 500; transition: color 0.3s ease; max-width: 72px; }
.swatch.is-active .swatch__name { color: var(--color-stone); }
.materials__stone-name { font-family: var(--font-display); font-style: italic; font-size: var(--text-body); color: var(--color-stone); margin-bottom: 1rem; letter-spacing: 0.01em; }

/* Stone chip tags (consoles — no swatch selector) */
.materials__stone-chips { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: var(--space-md); }
.stone-chip { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1rem; border: 1px solid rgba(34, 35, 35, 0.12); font-size: var(--text-xs); font-weight: 500; text-transform: uppercase; letter-spacing: var(--ls-medium); color: var(--color-stone); }
.stone-chip__dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

/* ============================================
   6. TECHNICAL SPECIFICATIONS
============================================ */
.specs-section {
  padding: var(--space-2xl) 0;
}

.specs__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.specs__label {
  font-family: var(--font-body);
  font-size: var(--text-subtitle);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  display: block;
  margin-bottom: 0.5rem;
}

.specs__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
}

.specs__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.specs__drawing {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: var(--space-md);
}

.specs__drawing img {
  width: 100%;
  max-width: 480px;
  height: auto;
}

.specs__table {
  width: 100%;
  border-collapse: collapse;
}

.specs__table tr {
  border-bottom: 1px solid rgba(34, 35, 35, 0.1);
}

.specs__table td {
  padding: 1rem 0;
  font-weight: 400;
  font-size: var(--text-body);
  line-height: 1.5;
}

.specs__table td:first-child {
  font-family: var(--font-body);
  font-size: var(--text-small);
  text-transform: uppercase;
  letter-spacing: var(--ls-medium);
  color: var(--color-river-green);
  font-weight: 500;
  width: 170px;
  padding-right: 1.5rem;
}

/* ============================================
   7. ADVICE BANNER
============================================ */
.advice-banner {
  background: var(--color-dusk-blue);
  padding: clamp(3.5rem, 6vw, 5.5rem) 0;
}

.advice-banner__text {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  color: var(--color-ivory);
  line-height: 1.5;
  max-width: 820px;
  margin: 0 auto;
  letter-spacing: 0.01em;
}

/* ============================================
   8. FAQ
============================================ */
.faq-section {
  padding: var(--space-2xl) 0;
}

.faq__inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-2xl);
  align-items: start;
}

.faq__label {
  font-family: var(--font-body);
  font-size: var(--text-subtitle);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  display: block;
  margin-bottom: 1rem;
}

.faq__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  line-height: 1.3;
  margin-bottom: 2rem;
}

.faq-item {
  border-bottom: 1px solid rgba(34, 35, 35, 0.08);
}

.faq-item__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 400;
  text-align: left;
  cursor: pointer;
  transition: color var(--duration-fast);
}

.faq-item__question:hover { color: var(--color-sunset); }

.faq-item__icon {
  font-size: 1.25rem;
  font-weight: 300;
  transition: transform var(--duration-fast);
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq-item.is-open .faq-item__icon { transform: rotate(45deg); }

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-spring), padding var(--duration-fast);
}

.faq-item.is-open .faq-item__answer {
  max-height: 400px;
  padding-bottom: 1.25rem;
}

.faq-item__answer p {
  font-weight: 400;
  line-height: var(--lh-body);
  color: var(--color-river-green);
}

/* ============================================
   9. RELATED PRODUCTS
============================================ */
.related-section {
  padding: var(--space-2xl) 0;
  background: var(--color-sand);
}

.related__header {
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.related__label {
  font-family: var(--font-body);
  font-size: var(--text-subtitle);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  display: block;
  margin-bottom: 0.5rem;
}

.related__title {
  font-family: var(--font-display);
  font-size: var(--text-h1);
}

.related__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.creation-card {
  text-decoration: none;
  color: var(--color-stone);
  display: block;
}

.creation-card__media {
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.creation-card__img {
  width: 100%;
  aspect-ratio: 5 / 4;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.creation-card:hover .creation-card__img { transform: scale(1.03); }

.creation-card__name {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  margin-bottom: 0.375rem;
}

.creation-card__type {
  font-family: var(--font-body);
  font-size: var(--text-small);
  text-transform: uppercase;
  letter-spacing: var(--ls-medium);
  color: var(--color-river-green);
  display: block;
  margin-bottom: 1rem;
  font-weight: 400;
}

/* ============================================
   10. INQUIRY FORM
============================================ */
.inquiry-section {
  padding: var(--space-2xl) 0;
}

.inquiry__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.inquiry__media-col {
  position: sticky;
  top: 120px;
}

.inquiry__media-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  display: block;
  margin-bottom: 1rem;
}

.inquiry__img-wrap {
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.inquiry__preview-img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  transition: opacity 0.25s ease;
}

.inquiry__thumbs {
  display: flex;
  gap: 0.5rem;
}

.inquiry__label {
  font-family: var(--font-body);
  font-size: var(--text-subtitle);
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-river-green);
  display: block;
  margin-bottom: 0.75rem;
}

.inquiry__heading {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  margin-bottom: 1rem;
  line-height: 1.3;
}

.inquiry__text {
  font-weight: 400;
  line-height: var(--lh-body);
  margin-bottom: var(--space-lg);
  max-width: 440px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group--full { grid-column: span 2; }

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.875rem 0;
  border: none;
  border-bottom: 1px solid rgba(163, 153, 106, 0.5);
  background: transparent;
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 400;
  color: var(--color-stone);
  outline: none;
  transition: border-color var(--duration-fast);
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--color-river-green); }

.form-input:focus,
.form-textarea:focus { border-bottom-color: var(--color-stone); }

.form-textarea { resize: none; min-height: 100px; }

.form-consent {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.form-consent input {
  width: 16px;
  height: 16px;
  margin-top: 3px;
  accent-color: var(--color-stone);
  flex-shrink: 0;
}

.form-consent label {
  font-size: var(--text-small);
  color: var(--color-river-green);
  line-height: 1.5;
}

.form-consent a {
  color: var(--color-stone);
  text-decoration: underline;
}

.inquiry__form .btn-primary {
  width: 100%;
  text-align: center;
  margin-top: 0.5rem;
}

/* ============================================
   11. FOOTER THEME (product pages — light bg)
============================================ */
.site-footer {
  background: var(--color-ivory);
  color: var(--color-stone);
}

/* ============================================
   12. RESPONSIVE — TABLET
============================================ */
@media (max-width: 1023px) {
  .product-hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .product-hero__info {
    order: 2;
    padding: var(--space-lg) var(--container-pad);
  }

  .product-hero__content {
    padding: var(--space-md) 0;
    justify-content: flex-start;
  }

  .product-hero__media { order: 1; }

  .product-hero__img { min-height: 60vh; }

  .gallery-strip__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .gallery-strip__img { aspect-ratio: 16 / 9; }

  .editorial-split--full-bleed,
  .editorial-split--full-bleed.editorial-split--img-right {
    grid-template-columns: 1fr 1fr;
    min-height: auto;
  }

  .editorial-split--full-bleed .editorial-split__img {
    min-height: auto;
    aspect-ratio: 4 / 5;
  }

  .editorial-split--full-bleed .editorial-split__content,
  .editorial-split--full-bleed.editorial-split--img-right .editorial-split__content {
    padding: clamp(2rem, 4vw, 3.5rem);
  }

  .materials__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .specs__grid { grid-template-columns: 1fr; }

  .faq__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .related__grid { grid-template-columns: repeat(2, 1fr); }

  .inquiry__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .inquiry__media-col { position: static; }
}

/* ============================================
   13. RESPONSIVE — MOBILE
============================================ */
@media (max-width: 767px) {
  .product-hero__img { min-height: 50vh; }

  .hero-thumb { width: 48px; height: 48px; }

  .gallery-strip__grid { grid-template-columns: repeat(2, 1fr); }

  .editorial-split--full-bleed,
  .editorial-split--full-bleed.editorial-split--img-right {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .editorial-split--full-bleed .editorial-split__media { order: 1; }

  .editorial-split--full-bleed .editorial-split__img {
    aspect-ratio: 4 / 3;
    min-height: auto;
  }

  .editorial-split--full-bleed .editorial-split__content { order: 2; padding: 2rem var(--container-pad); }
  .editorial-split--full-bleed.editorial-split--img-right .editorial-split__media { order: 1; }
  .editorial-split--full-bleed.editorial-split--img-right .editorial-split__content { padding: 2rem var(--container-pad); }

  .materials__swatches { gap: 0.75rem 0.625rem; }
  .swatch__img { width: 60px; height: 80px; }

  .form-row { grid-template-columns: 1fr; }
  .form-group--full { grid-column: span 1; }

  .related__grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
}