/* ==========================================================
   Material Guides — home-system visual language
   Tokens aligned to v2-home / site navy-blue industrial UI.
   Layout families: mosaic tiles | swiss split | stacked rows | soft rail
   ========================================================== */

.v2-page[data-page="material-guides"] {
  --home-ink: #0b1f33;
  --home-muted: #5f6976;
  --home-line: #e2e8ef;
  --home-soft: #f5f8fb;
  --home-radius: 4px;
  --home-blue: #2b328e;
  --mat-ink: var(--home-ink);
  --mat-muted: var(--home-muted);
  --mat-line: var(--home-line);
  --mat-soft: var(--home-soft);
  --mat-radius: var(--home-radius);
  --mat-blue: var(--home-blue);
}

.v2-page[data-page="material-guides"] #material-details.v2-section {
  padding-top: clamp(36px, 4vw, 56px);
  padding-bottom: clamp(36px, 4vw, 56px);
}

/* ---------- Section heads (eyebrow ration: hero only keeps section-code) ---------- */
.v2-page[data-page="material-guides"] .mat-section-head {
  display: grid;
  gap: 6px;
  max-width: 62ch;
  margin: 0 0 16px;
}

.v2-page[data-page="material-guides"] .mat-section-head > .section-code {
  display: none;
}

.v2-page[data-page="material-guides"] .mat-section-head > h2 {
  margin: 0;
  color: var(--mat-ink);
  font-size: clamp(26px, 2.6vw, 36px);
  font-weight: 740;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.v2-page[data-page="material-guides"] .mat-section-head > p {
  margin: 0;
  color: var(--mat-muted);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.65;
  max-width: none;
}

.v2-page[data-page="material-guides"] .mat-band {
  background: var(--mat-soft);
}

.v2-page[data-page="material-guides"] #material-categories.v2-section {
  padding-top: clamp(32px, 3.5vw, 48px);
  padding-bottom: clamp(28px, 3vw, 40px);
}

/* ==========================================================
   1) Categories — one compact row (jump into details)
   ========================================================== */
.v2-page[data-page="material-guides"] .mat-cat-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--mat-line);
  border-radius: var(--mat-radius);
  overflow: hidden;
  background: #fff;
}

.v2-page[data-page="material-guides"] .mat-cat-card {
  appearance: none;
  display: grid;
  grid-template-rows: 168px auto;
  align-content: start;
  text-align: left;
  min-height: 0;
  padding: 0;
  border: 0;
  border-right: 1px solid var(--mat-line);
  border-radius: 0;
  background: #fff;
  color: inherit;
  font: inherit;
  cursor: pointer;
  overflow: hidden;
  box-shadow: none;
  transform: none;
}

.v2-page[data-page="material-guides"] .mat-cat-card:last-child {
  border-right: 0;
}

.v2-page[data-page="material-guides"] .mat-cat-card:hover {
  background: var(--mat-soft);
  border-color: var(--mat-line);
  box-shadow: none;
  transform: none;
}

.v2-page[data-page="material-guides"] .mat-cat-card:active {
  transform: none;
}

.v2-page[data-page="material-guides"] .mat-cat-card:focus-visible {
  outline: 2px solid var(--mat-blue);
  outline-offset: -2px;
  z-index: 1;
}

.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(1),
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(2),
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(n + 3) {
  grid-column: auto;
}

.v2-page[data-page="material-guides"] .mat-cat-media {
  margin: 0;
  padding: 0;
  height: 168px;
  background: transparent;
  border: 0;
  overflow: hidden;
  aspect-ratio: auto;
}

.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(1) .mat-cat-media,
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(2) .mat-cat-media {
  aspect-ratio: auto;
  height: 168px;
}

.v2-page[data-page="material-guides"] .mat-cat-img,
.v2-page[data-page="material-guides"] .mat-cat-icon {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center;
  padding: 0;
  margin: 0;
  border: 0;
  background: transparent;
  border-radius: 0;
}

.v2-page[data-page="material-guides"] .mat-cat-body {
  display: grid;
  gap: 2px;
  align-content: start;
  padding: 8px 10px 10px;
}

.v2-page[data-page="material-guides"] .mat-cat-card > h3,
.v2-page[data-page="material-guides"] .mat-cat-body > h3 {
  margin: 0;
  color: var(--mat-ink);
  font-size: 13px;
  font-weight: 720;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(1) .mat-cat-body > h3,
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(2) .mat-cat-body > h3 {
  font-size: 13px;
}

.v2-page[data-page="material-guides"] .mat-cat-card > p,
.v2-page[data-page="material-guides"] .mat-cat-body > p {
  display: none;
}

.v2-page[data-page="material-guides"] .mat-cat-count {
  margin: 0;
  color: var(--mat-muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0;
}

@media (max-width: 1024px) {
  .v2-page[data-page="material-guides"] .mat-cat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .v2-page[data-page="material-guides"] .mat-cat-card:nth-child(4n) {
    border-right: 0;
  }

  .v2-page[data-page="material-guides"] .mat-cat-card:nth-child(-n + 4) {
    border-bottom: 1px solid var(--mat-line);
  }
}

@media (max-width: 640px) {
  .v2-page[data-page="material-guides"] .mat-cat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
  }

  .v2-page[data-page="material-guides"] .mat-cat-card,
  .v2-page[data-page="material-guides"] .mat-cat-card:nth-child(1),
  .v2-page[data-page="material-guides"] .mat-cat-card:nth-child(2),
  .v2-page[data-page="material-guides"] .mat-cat-card:nth-child(n + 3) {
    grid-column: auto;
    grid-template-columns: 1fr;
    grid-template-rows: 64px auto;
    border-right: 1px solid var(--mat-line);
    border-bottom: 1px solid var(--mat-line);
  }

  .v2-page[data-page="material-guides"] .mat-cat-card:nth-child(2n) {
    border-right: 0;
  }

  .v2-page[data-page="material-guides"] .mat-cat-media {
    height: 64px;
    min-height: 0;
  }

  .v2-page[data-page="material-guides"] .mat-cat-body {
    padding: 8px 10px;
  }
}

.v2-page[data-page="material-guides"] #material-details .mat-cat-grid {
  margin: 0;
  border-bottom: 0;
  border-radius: var(--mat-radius) var(--mat-radius) 0 0;
}

.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab.active,
.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab.is-active {
  background: var(--mat-soft);
  box-shadow: inset 0 -2px 0 var(--mat-blue);
  color: var(--mat-ink);
}

.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab.active h3,
.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab.is-active h3 {
  color: var(--mat-ink);
}

.v2-page[data-page="material-guides"] #material-details .mat-panel {
  border-top: 0;
  border-radius: 0 0 var(--mat-radius) var(--mat-radius);
}

/* ==========================================================
   2) Details tabs — material swatch rail (home process DNA + 图文)
   ========================================================== */
.v2-page[data-page="material-guides"] .mat-tabs-wrap {
  position: relative;
  margin: 0 0 16px;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: visible;
}

.v2-page[data-page="material-guides"] .mat-tabs {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: visible;
}

.v2-page[data-page="material-guides"] .mat-tab {
  appearance: none;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto auto;
  justify-items: stretch;
  gap: 10px;
  width: 100%;
  min-height: 0;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--mat-muted);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.v2-page[data-page="material-guides"] .mat-tab:last-child {
  border-right: 0;
}

.v2-page[data-page="material-guides"] .mat-tab-swatch {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--mat-line);
  border-radius: var(--mat-radius);
  background: transparent;
  box-shadow: none;
}

.v2-page[data-page="material-guides"] .mat-tab-swatch img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center;
  padding: 0;
  margin: 0;
  border: 0;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-tab-label {
  display: block;
  padding: 0 2px 6px;
  border-bottom: 2px solid transparent;
  color: inherit;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: -0.015em;
  line-height: 1.3;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.v2-page[data-page="material-guides"] .mat-tab:hover {
  color: var(--mat-ink);
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-tab:hover .mat-tab-swatch {
  border-color: #c8d2de;
}

.v2-page[data-page="material-guides"] .mat-tab:focus-visible {
  outline: none;
}

.v2-page[data-page="material-guides"] .mat-tab:focus-visible .mat-tab-swatch {
  outline: 2px solid var(--mat-blue);
  outline-offset: 2px;
}

.v2-page[data-page="material-guides"] .mat-tab.active,
.v2-page[data-page="material-guides"] .mat-tab.is-active {
  color: var(--mat-ink);
  background: transparent;
  box-shadow: none;
}

.v2-page[data-page="material-guides"] .mat-tab.active .mat-tab-swatch,
.v2-page[data-page="material-guides"] .mat-tab.is-active .mat-tab-swatch {
  border-color: var(--mat-ink);
  box-shadow: none;
}

.v2-page[data-page="material-guides"] .mat-tab.active .mat-tab-label,
.v2-page[data-page="material-guides"] .mat-tab.is-active .mat-tab-label {
  color: var(--mat-ink);
  font-weight: 740;
  border-bottom-color: var(--mat-blue);
}

.v2-page[data-page="material-guides"] .mat-tab.active:hover,
.v2-page[data-page="material-guides"] .mat-tab.is-active:hover {
  color: var(--mat-ink);
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-tab.active:hover .mat-tab-swatch,
.v2-page[data-page="material-guides"] .mat-tab.is-active:hover .mat-tab-swatch {
  border-color: var(--mat-ink);
  box-shadow: none;
}

@media (max-width: 1100px) {
  .v2-page[data-page="material-guides"] .mat-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px 12px;
  }

  .v2-page[data-page="material-guides"] .mat-tab:nth-child(4n),
  .v2-page[data-page="material-guides"] .mat-tab:nth-child(-n + 4) {
    border: 0;
  }
}

@media (max-width: 640px) {
  .v2-page[data-page="material-guides"] .mat-tabs-wrap {
    margin-left: -4px;
    margin-right: -4px;
    padding: 0 4px 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }

  .v2-page[data-page="material-guides"] .mat-tabs {
    display: flex;
    width: max-content;
    min-width: 100%;
    gap: 10px;
    grid-template-columns: none;
  }

  .v2-page[data-page="material-guides"] .mat-tab {
    flex: 0 0 auto;
    width: 6.75rem;
    min-width: 6.75rem;
    min-height: 0;
    padding: 0;
    border: 0;
    white-space: normal;
  }

  .v2-page[data-page="material-guides"] .mat-tab:nth-child(4n),
  .v2-page[data-page="material-guides"] .mat-tab:nth-child(-n + 4) {
    border: 0;
  }

  .v2-page[data-page="material-guides"] .mat-tab-label {
    font-size: 12px;
    white-space: nowrap;
  }
}

.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab {
  display: grid;
  grid-template-rows: 168px auto;
  gap: 0;
  width: auto;
  min-height: 0;
  padding: 0;
  border: 0;
  border-right: 1px solid var(--mat-line);
  background: #fff;
  color: inherit;
  text-align: left;
  white-space: normal;
}

.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab:last-child {
  border-right: 0;
}

.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab:hover {
  background: var(--mat-soft);
  color: inherit;
}

.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab:active {
  transform: none;
}

.v2-page[data-page="material-guides"] .mat-panel[hidden] {
  display: none !important;
}

/* Compact one-screen stack: overview + grades + apps as one block */
.v2-page[data-page="material-guides"] .mat-panel {
  border: 1px solid var(--mat-line);
  border-radius: var(--mat-radius);
  background: #fff;
  overflow: hidden;
}

.v2-page[data-page="material-guides"] .mat-overview {
  display: block;
  margin: 0;
  padding: clamp(16px, 1.8vw, 22px);
  border: 0;
  border-bottom: 1px solid var(--mat-line);
  border-radius: 0;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-overview-right {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(220px, 0.75fr);
  gap: clamp(16px, 2vw, 28px);
  align-items: start;
}

.v2-page[data-page="material-guides"] .mat-sample-figure {
  display: none;
}

.v2-page[data-page="material-guides"] .mat-sample-note {
  display: none !important;
}

.v2-page[data-page="material-guides"] .mat-desc > h3 {
  margin: 0 0 8px;
  color: var(--mat-ink);
  font-size: clamp(18px, 1.6vw, 22px);
  font-weight: 720;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.v2-page[data-page="material-guides"] .mat-desc > p {
  margin: 0 0 8px;
  color: var(--mat-muted);
  font-size: 13.5px;
  line-height: 1.55;
  max-width: 62ch;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.v2-page[data-page="material-guides"] .mat-desc > p:last-child {
  margin-bottom: 0;
}

.v2-page[data-page="material-guides"] .mat-key-props {
  padding: 0;
  border: 0;
  border-top: 1px solid var(--mat-line);
  border-radius: 0;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-key-props > h4 {
  margin: 0;
  padding-top: 10px;
  padding-bottom: 2px;
  color: var(--mat-ink);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.02em;
  text-transform: none;
}

.v2-page[data-page="material-guides"] .mat-prop-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 6px 0;
  border-top: 1px solid rgba(226, 232, 239, 0.95);
  font-size: 12.5px;
}

.v2-page[data-page="material-guides"] .mat-prop-row:first-of-type {
  border-top: 0;
}

.v2-page[data-page="material-guides"] .mat-prop-label {
  color: var(--mat-muted);
}

.v2-page[data-page="material-guides"] .mat-prop-val {
  color: var(--mat-ink);
  font-weight: 650;
  text-align: right;
}

.v2-page[data-page="material-guides"] .mat-stars {
  color: var(--mat-blue);
  letter-spacing: 0.06em;
}

.v2-page[data-page="material-guides"] .mat-star-empty {
  opacity: 0.28;
}

/* Grades — denser 2-col, same card */
.v2-page[data-page="material-guides"] .mat-grades-title {
  margin: 0;
  padding: 12px clamp(14px, 1.6vw, 20px) 6px;
  color: var(--mat-ink);
  font-size: 15px;
  font-weight: 720;
  letter-spacing: -0.02em;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-grades {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 24px;
  margin: 0;
  padding: 0 clamp(14px, 1.6vw, 20px) 4px;
  border-top: 0;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-grade-card {
  padding: 8px 0;
  border: 0;
  border-bottom: 1px solid var(--mat-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.v2-page[data-page="material-guides"] .mat-grade-name {
  display: block;
  margin: 0 0 3px;
  color: var(--mat-ink);
  font-size: 13.5px;
  font-weight: 720;
  letter-spacing: -0.015em;
}

.v2-page[data-page="material-guides"] .mat-grade-note {
  margin: 0;
  color: var(--mat-muted);
  font-size: 12.5px;
  line-height: 1.45;
}

.v2-page[data-page="material-guides"] .mat-apps {
  display: block;
  margin: 0;
  padding: 16px clamp(14px, 1.6vw, 20px) 18px;
  border-top: 1px solid var(--mat-line);
  background: #fff;
}

.v2-page[data-page="material-guides"] .mat-apps > h4 {
  margin: 0 0 12px;
  padding: 0;
  display: block;
  border: 0;
  color: var(--mat-ink);
  font-size: 15px;
  font-weight: 720;
  letter-spacing: -0.02em;
  line-height: 1.3;
  text-transform: none;
}

.v2-page[data-page="material-guides"] .mat-app-badges {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-app-badge {
  display: grid;
  grid-template-rows: auto auto;
  align-items: stretch;
  min-height: 0;
  padding: 0;
  border: 1px solid var(--mat-line);
  border-right: 1px solid var(--mat-line);
  border-bottom: 1px solid var(--mat-line);
  border-radius: var(--mat-radius);
  background: #fff;
  color: var(--mat-ink);
  overflow: hidden;
}

.v2-page[data-page="material-guides"] .mat-app-badge img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: center;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-app-badge > span {
  display: block;
  padding: 8px 10px 10px;
  font-size: 13px;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.v2-page[data-page="material-guides"] .mat-app-badge:nth-child(4n),
.v2-page[data-page="material-guides"] .mat-app-badge:nth-last-child(-n + 4) {
  border-right: 1px solid var(--mat-line);
  border-bottom: 1px solid var(--mat-line);
}

@media (max-width: 900px) {
  .v2-page[data-page="material-guides"] .mat-app-badges {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .v2-page[data-page="material-guides"] .mat-overview-right {
    grid-template-columns: 1fr;
  }

  .v2-page[data-page="material-guides"] .mat-grades {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

/* ==========================================================
   3) Selection guide — split media + stacked rows (no step nums)
   ========================================================== */
.v2-page[data-page="material-guides"] #selection-guide.mat-select-section {
  padding-top: clamp(56px, 7vw, 88px);
  padding-bottom: clamp(56px, 7vw, 88px);
}

.v2-page[data-page="material-guides"] .mat-select-split {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.2fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.v2-page[data-page="material-guides"] .mat-select-media {
  margin: 0;
  padding: 0;
  border: 1px solid var(--mat-line);
  border-radius: var(--mat-radius);
  overflow: hidden;
  background: transparent;
  position: sticky;
  top: 112px;
}

.v2-page[data-page="material-guides"] .mat-select-media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 4 / 5;
  padding: 0;
  background: transparent;
}

.v2-page[data-page="material-guides"] .mat-select-copy > h2 {
  margin: 0 0 12px;
  color: var(--mat-ink);
  font-size: clamp(26px, 2.6vw, 36px);
  font-weight: 740;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.v2-page[data-page="material-guides"] .mat-select-copy > p {
  margin: 0 0 24px;
  color: var(--mat-muted);
  font-size: 16px;
  line-height: 1.65;
  max-width: 52ch;
}

.v2-page[data-page="material-guides"] .mat-select-rows {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] .mat-select-row {
  display: grid;
  grid-template-columns: minmax(140px, 0.4fr) minmax(0, 1fr);
  gap: 16px 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] .mat-select-row > h3 {
  margin: 0;
  color: var(--mat-ink);
  font-size: 15px;
  font-weight: 720;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.v2-page[data-page="material-guides"] .mat-select-row > p {
  margin: 0;
  color: var(--mat-muted);
  font-size: 14px;
  line-height: 1.6;
}

.v2-page[data-page="material-guides"] .mat-select-cta {
  margin: 28px 0 0;
}

.v2-page[data-page="material-guides"] .mat-select-cta .button {
  display: inline-flex;
}

@media (max-width: 900px) {
  .v2-page[data-page="material-guides"] .mat-select-split {
    grid-template-columns: 1fr;
  }

  .v2-page[data-page="material-guides"] .mat-select-media {
    position: static;
    max-width: 420px;
  }

  .v2-page[data-page="material-guides"] .mat-select-media img {
    aspect-ratio: 16 / 10;
  }

  .v2-page[data-page="material-guides"] .mat-select-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

/* ==========================================================
   4) Certification — soft band + horizontal rail
   ========================================================== */
.v2-page[data-page="material-guides"] #material-certification.mat-cert-section {
  background: var(--mat-soft);
  border-top: 1px solid var(--mat-line);
  border-bottom: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] .mat-cert-inner {
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.v2-page[data-page="material-guides"] .mat-cert-inner > h2 {
  margin: 0;
  max-width: 28ch;
  color: var(--mat-ink);
  font-size: clamp(26px, 2.6vw, 34px);
  font-weight: 740;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.v2-page[data-page="material-guides"] .mat-cert-inner > .mat-cert-lead {
  margin: -12px 0 0;
  max-width: 58ch;
  color: var(--mat-muted);
  font-size: 16px;
  line-height: 1.65;
}

.v2-page[data-page="material-guides"] .mat-cert-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--mat-line);
  border-radius: var(--mat-radius);
  background: #fff;
  overflow: hidden;
}

.v2-page[data-page="material-guides"] .mat-cert-item {
  padding: clamp(20px, 2.4vw, 28px) clamp(16px, 1.8vw, 22px);
  border-right: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] .mat-cert-item:last-child {
  border-right: 0;
}

.v2-page[data-page="material-guides"] .mat-cert-item > h3 {
  margin: 0 0 8px;
  color: var(--mat-ink);
  font-size: 15px;
  font-weight: 720;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.v2-page[data-page="material-guides"] .mat-cert-item > p {
  margin: 0;
  color: var(--mat-muted);
  font-size: 13.5px;
  line-height: 1.55;
}

.v2-page[data-page="material-guides"] .mat-cert-item .mat-cert-icon {
  width: 28px;
  height: 28px;
  display: block;
  margin-bottom: 14px;
  color: var(--mat-blue);
  stroke: var(--mat-blue);
  fill: none;
  stroke-width: 1.5;
}

@media (max-width: 960px) {
  .v2-page[data-page="material-guides"] .mat-cert-rail {
    grid-template-columns: 1fr 1fr;
  }

  .v2-page[data-page="material-guides"] .mat-cert-item:nth-child(2n) {
    border-right: 0;
  }

  .v2-page[data-page="material-guides"] .mat-cert-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--mat-line);
  }
}

@media (max-width: 560px) {
  .v2-page[data-page="material-guides"] .mat-cert-rail {
    grid-template-columns: 1fr;
  }

  .v2-page[data-page="material-guides"] .mat-cert-item {
    border-right: 0;
    border-bottom: 1px solid var(--mat-line);
  }

  .v2-page[data-page="material-guides"] .mat-cert-item:last-child {
    border-bottom: 0;
  }
}

/* ==========================================================
   CTA band polish
   ========================================================== */
.v2-page[data-page="material-guides"] .v2-cta-band .section-code {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .v2-page[data-page="material-guides"] .mat-cat-card,
  .v2-page[data-page="material-guides"] .mat-tab {
    transition: none;
  }

  .v2-page[data-page="material-guides"] .mat-cat-card:hover {
    transform: none;
  }
}


/* ==========================================================
   Catalog hierarchy
   Photo selector, spec band, grade index, side-image apps.
   Variance 5 / motion 2 / density 5. No lift, no shadow.
   ========================================================== */
.v2-page[data-page="material-guides"] #material-details.v2-section {
  padding-top: 32px;
  padding-bottom: 40px;
}

.v2-page[data-page="material-guides"] #material-details .mat-section-head {
  max-width: none;
  gap: 4px;
  margin: 0 0 14px;
}

.v2-page[data-page="material-guides"] #material-details .mat-section-head > h2 {
  font-size: clamp(28px, 2.4vw, 36px);
}

.v2-page[data-page="material-guides"] #material-details .mat-section-head > p {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.55;
}

.v2-page[data-page="material-guides"] .mat-cat-card,
.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab {
  grid-template-rows: 128px auto;
  background: #fff;
}

.v2-page[data-page="material-guides"] .mat-cat-media,
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(1) .mat-cat-media,
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(2) .mat-cat-media {
  height: 128px;
}

.v2-page[data-page="material-guides"] .mat-cat-body {
  gap: 3px;
  min-height: 58px;
  padding: 10px 10px 12px;
}

.v2-page[data-page="material-guides"] .mat-cat-body > h3,
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(1) .mat-cat-body > h3,
.v2-page[data-page="material-guides"] .mat-cat-card:nth-child(2) .mat-cat-body > h3 {
  font-size: 15px;
  line-height: 1.3;
}

.v2-page[data-page="material-guides"] .mat-cat-count {
  font-size: 13px;
}

.v2-page[data-page="material-guides"] #material-details .mat-cat-grid {
  border-bottom: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab.active,
.v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab.is-active {
  background: #fff;
  box-shadow: inset 0 -3px 0 var(--mat-blue);
}

.v2-page[data-page="material-guides"] #material-details .mat-panel {
  display: block;
}

.v2-page[data-page="material-guides"] #material-details .mat-overview {
  display: block;
  margin: 0;
  padding: 18px 20px 16px;
  border-right: 0;
  border-bottom: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] #material-details .mat-overview-right {
  display: block;
}

.v2-page[data-page="material-guides"] #material-details .mat-desc {
  max-width: 78ch;
}

.v2-page[data-page="material-guides"] #material-details .mat-desc > h3 {
  margin: 0 0 10px;
  font-size: clamp(24px, 1.8vw, 30px);
  letter-spacing: -0.03em;
}

.v2-page[data-page="material-guides"] #material-details .mat-desc > p {
  max-width: 78ch;
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-line-clamp: 4;
}

.v2-page[data-page="material-guides"] #material-details .mat-desc > p + p {
  -webkit-line-clamp: 2;
}

.v2-page[data-page="material-guides"] #material-details .mat-key-props {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  margin: 16px 0 0;
  padding: 0;
  border: 1px solid var(--mat-line);
  border-left: 1px solid var(--mat-line);
  border-radius: 4px;
  background: var(--mat-soft);
  overflow: hidden;
}

.v2-page[data-page="material-guides"] #material-details .mat-key-props > h4 {
  grid-column: 1 / -1;
  margin: 0;
  padding: 8px 12px 0;
  border: 0;
  background: transparent;
  color: var(--mat-ink);
  font-size: 16px;
  font-weight: 720;
  letter-spacing: -0.01em;
  text-transform: none;
}

.v2-page[data-page="material-guides"] #material-details .mat-prop-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  min-width: 0;
  padding: 8px 12px 12px;
  border: 0;
  border-right: 1px solid var(--mat-line);
  font-size: 13px;
}

.v2-page[data-page="material-guides"] #material-details .mat-prop-row:last-child {
  border-right: 0;
}

.v2-page[data-page="material-guides"] #material-details .mat-prop-label {
  order: 2;
  color: var(--mat-muted);
  font-size: 13px;
  line-height: 1.35;
}

.v2-page[data-page="material-guides"] #material-details .mat-prop-val {
  order: 1;
  color: var(--mat-ink);
  font-size: 18px;
  font-weight: 720;
  letter-spacing: -0.02em;
  line-height: 1.3;
  text-align: left;
}

.v2-page[data-page="material-guides"] #material-details .mat-stars {
  font-size: 16px;
  letter-spacing: 0.04em;
}

.v2-page[data-page="material-guides"] #material-details .mat-grade-stack {
  display: block;
  min-width: 0;
  padding: 14px 20px 6px;
  border-top: 0;
}

.v2-page[data-page="material-guides"] #material-details .mat-grade-col + .mat-grade-col {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] #material-details .mat-grades-title {
  padding: 0 0 4px;
  font-size: 18px;
}

.v2-page[data-page="material-guides"] #material-details .mat-grades {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 28px;
  padding: 0;
}

.v2-page[data-page="material-guides"] #material-details .mat-grade-card {
  padding: 8px 0 9px;
}

.v2-page[data-page="material-guides"] #material-details .mat-grade-name {
  font-size: 16px;
}

.v2-page[data-page="material-guides"] #material-details .mat-grade-note {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  font-size: 15px;
  line-height: 1.5;
}

.v2-page[data-page="material-guides"] #material-details .mat-apps {
  display: block;
  padding: 12px 20px 18px;
  border-top: 1px solid var(--mat-line);
  background: #fff;
}

.v2-page[data-page="material-guides"] #material-details .mat-apps > h4 {
  margin: 0 0 12px;
  font-size: 18px;
}

.v2-page[data-page="material-guides"] #material-details .mat-app-badges {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  border: 0;
  border-radius: 0;
  overflow: visible;
  background: transparent;
}

.v2-page[data-page="material-guides"] #material-details .mat-app-badge {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto;
  align-items: stretch;
  min-height: 0;
  border: 1px solid var(--mat-line);
  border-right: 1px solid var(--mat-line);
  border-bottom: 1px solid var(--mat-line);
  border-radius: 4px;
  background: #fff;
  overflow: hidden;
}

.v2-page[data-page="material-guides"] #material-details .mat-app-badge:nth-child(n) {
  border-top: 1px solid var(--mat-line);
  border-right: 1px solid var(--mat-line);
}

.v2-page[data-page="material-guides"] #material-details .mat-app-badge:hover {
  background: var(--mat-soft);
  transform: none;
  box-shadow: none;
}

.v2-page[data-page="material-guides"] #material-details .mat-app-badge img {
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  padding: 0;
  background: transparent;
}

.v2-page[data-page="material-guides"] #material-details .mat-app-badge > span {
  padding: 10px 12px 12px;
  font-size: 16px;
  font-weight: 650;
  line-height: 1.35;
}

@media (max-width: 1100px) {
  .v2-page[data-page="material-guides"] #material-details .mat-key-props {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .v2-page[data-page="material-guides"] #material-details .mat-prop-row:nth-child(3n + 1) {
    border-right: 1px solid var(--mat-line);
  }

  .v2-page[data-page="material-guides"] #material-details .mat-prop-row:nth-child(n + 5) {
    border-top: 1px solid var(--mat-line);
  }

  .v2-page[data-page="material-guides"] #material-details .mat-grades {
    grid-template-columns: 1fr 1fr;
  }

  .v2-page[data-page="material-guides"] #material-details .mat-app-badges {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 700px) {
  .v2-page[data-page="material-guides"] #material-details .mat-key-props,
  .v2-page[data-page="material-guides"] #material-details .mat-grades,
  .v2-page[data-page="material-guides"] #material-details .mat-app-badges {
    grid-template-columns: 1fr;
  }

  .v2-page[data-page="material-guides"] #material-details .mat-prop-row {
    border-right: 0;
    border-top: 1px solid var(--mat-line);
  }

  .v2-page[data-page="material-guides"] .mat-cat-card,
  .v2-page[data-page="material-guides"] .mat-cat-grid .mat-tab {
    grid-template-rows: 72px auto;
  }

  .v2-page[data-page="material-guides"] .mat-cat-media {
    height: 72px;
  }
}