@layer reset, base, theme, components, utilities;

@layer reset {
  :where(html, body, div, span, h1, h2, h3, h4, p, ul, ol, li, figure, figcaption, blockquote, dl, dd, form, fieldset, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, details, footer, header, main, nav, section, summary, search, dialog) {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  :where(button, input, select, textarea) {
    font: inherit;
    color: inherit;
    box-sizing: border-box;
  }

  :where(img, picture, svg, video) {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
  }

  :where(ul, ol) {
    list-style: none;
  }

  :where(a) {
    color: inherit;
    text-decoration: none;
  }
}

@layer theme {
  :root {
    /* Tier 1: Literal Brand Tokens from DTB_UK_2026_NEW.pdf */
    --color-obsidian: #0a0d12;
    --color-charcoal: #121721;
    --color-slate-900: #0f172a;
    --color-slate-800: #1e293b;
    --color-slate-700: #334155;
    --color-slate-600: #475569;
    --color-slate-500: #64748b;
    --color-slate-300: #cbd5e1;
    --color-slate-200: #e2e8f0;
    --color-slate-100: #f1f5f9;
    --color-slate-50: #f8fafc;
    --color-white: #ffffff;

    /* Catalog Line Colors */
    --color-dtb-blue: #3c91cc;       /* Mini Line & Brand Blue */
    --color-dtb-blue-dark: #256ea3;
    --color-dtb-blue-soft: #eaf4fb;
    --color-dtb-purple: #7c3a84;     /* Ultra Mini Line */
    --color-dtb-purple-soft: #f5ecf7;
    --color-dtb-red: #d9232e;        /* Cover Accent & Biomaterials */
    --color-dtb-red-soft: #fdecee;
    --color-dtb-amber: #f5a623;      /* Surgical Kit Line */
    --color-dtb-amber-soft: #fef6e6;
    --color-dtb-grey: #6e737b;       /* Scan Bodies & Caps Line */
    --color-dtb-grey-soft: #f1f2f4;

    /* Tier 2: Semantic Tokens */
    --surface-page: var(--color-slate-50);
    --surface-card: var(--color-white);
    --surface-dark: var(--color-obsidian);
    --surface-dark-elevated: var(--color-charcoal);
    --text-primary: var(--color-slate-900);
    --text-secondary: var(--color-slate-600);
    --text-muted: var(--color-slate-500);
    --text-on-dark: var(--color-white);
    --border-subtle: var(--color-slate-200);
    --border-strong: var(--color-slate-300);

    /* Typography & Spacing */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1.125rem;
    --radius-xl: 1.5rem;
    --radius-pill: 999px;

    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 4px 10px -3px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 20px 40px -12px rgba(15, 23, 42, 0.14);
    --container-max: 1320px;
  }
}

@layer base {
  html {
    scroll-behavior: smooth;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--surface-page);
    line-height: 1.6;
  }

  body {
    min-block-size: 100dvh;
    overflow-x: hidden;
    text-align: start;
    overflow-wrap: break-word;
  }

  p {
    text-wrap: pretty;
  }

  :focus-visible {
    outline: 2px solid var(--color-dtb-blue);
    outline-offset: 2px;
  }

  [inert], [inert] * {
    opacity: 0.5;
    cursor: default;
    user-select: none;
  }
}

@layer components {
  .container {
    inline-size: min(var(--container-max), 100% - 2.5rem);
    margin-inline: auto;
  }

  /* Top Announcement Bar */
  .top-bar {
    background-color: var(--color-obsidian);
    color: var(--color-slate-300);
    font-size: 0.8125rem;
    border-block-end: 1px solid rgba(255, 255, 255, 0.08);
    padding-block: 0.5rem;
  }

  .top-bar-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
  }

  .top-bar-badges {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
  }

  .top-bar-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
  }

  .badge-dot {
    inline-size: 0.5rem;
    block-size: 0.5rem;
    border-radius: var(--radius-pill);
    background-color: var(--color-dtb-red);
  }

  .top-bar-links {
    display: flex;
    align-items: center;
    gap: 1.25rem;
  }

  .top-bar-links a:hover {
    color: var(--color-white);
  }

  /* Main Sticky Header & Scrollspy Navigation (modern-web-guidance: scrollspy) */
  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 40;
    background-color: rgba(10, 13, 18, 0.92);
    backdrop-filter: blur(14px);
    border-block-end: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-white);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    padding-block: 0.875rem;
  }

  .brand-link {
    display: flex;
    align-items: center;
    gap: 0.85rem;
  }

  .brand-logo-svg {
    inline-size: 2.75rem;
    block-size: 2.75rem;
    flex-shrink: 0;
  }

  .brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
  }

  .brand-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--color-white);
  }

  .brand-subtitle {
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-dtb-blue);
    margin-block-start: 0.15rem;
  }

  /* Native CSS Scrollspy Target Group */
  .main-nav {
    scroll-target-group: auto;
  }

  .main-nav ul {
    display: flex;
    align-items: center;
    gap: 1.5rem;
  }

  .main-nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-slate-300);
    transition: color 0.2s ease, border-color 0.2s ease;
    padding-block: 0.35rem;
    border-block-end: 2px solid transparent;
  }

  .main-nav a:hover {
    color: var(--color-white);
  }

  /* Combine native :target-current with fallback escaped class inside :is() */
  .main-nav a:is(:target-current, .\:target-current) {
    color: var(--color-white);
    border-block-end-color: var(--color-dtb-blue);
    font-weight: 700;
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 0.65rem;
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding-block: 0.625rem;
    padding-inline: 1.15rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
    white-space: nowrap;
  }

  .btn:active:not(:disabled) {
    transform: translateY(1px);
  }

  .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }

  .btn-primary {
    background-color: var(--color-dtb-blue);
    color: var(--color-white);
  }

  .btn-primary:hover:not(:disabled) {
    background-color: var(--color-dtb-blue-dark);
  }

  .btn-crimson {
    background-color: var(--color-dtb-red);
    color: var(--color-white);
  }

  .btn-crimson:hover:not(:disabled) {
    background-color: #b81b25;
  }

  .btn-outline-light {
    background-color: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
  }

  .btn-outline-light:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.35);
  }

  .btn-outline {
    background-color: var(--color-white);
    border-color: var(--border-strong);
    color: var(--text-primary);
  }

  .btn-outline:hover:not(:disabled) {
    border-color: var(--color-dtb-blue);
    color: var(--color-dtb-blue-dark);
    background-color: var(--color-dtb-blue-soft);
  }

  .btn-sm {
    padding-block: 0.4rem;
    padding-inline: 0.75rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
  }

  .inquiry-count-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-inline-size: 1.35rem;
    block-size: 1.35rem;
    padding-inline: 0.35rem;
    border-radius: var(--radius-pill);
    background-color: var(--color-dtb-red);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 700;
  }

  .mobile-menu-btn {
    display: none;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
  }

  /* Hero Section (Catalog Page 1 & 32 Aesthetic) */
  .hero-section {
    position: relative;
    background: radial-gradient(circle at 78% 35%, rgba(60, 145, 204, 0.18), transparent 45%),
                radial-gradient(circle at 20% 80%, rgba(217, 35, 46, 0.12), transparent 40%),
                linear-gradient(135deg, #06080c 0%, #0d131d 60%, #111927 100%);
    color: var(--color-white);
    padding-block: 5rem 4.5rem;
    overflow: hidden;
    border-block-end: 1px solid rgba(255, 255, 255, 0.08);
  }

  .hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 3.5rem;
  }

  .hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding-block: 0.35rem;
    padding-inline: 0.9rem;
    border-radius: var(--radius-pill);
    background-color: rgba(60, 145, 204, 0.15);
    border: 1px solid rgba(60, 145, 204, 0.4);
    color: #7cc4f5;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-block-end: 1.5rem;
  }

  .hero-title-frame {
    border-block-start: 3px solid var(--color-dtb-red);
    border-block-end: 3px solid var(--color-dtb-red);
    padding-block: 1.5rem;
    margin-block-end: 1.5rem;
  }

  .hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.25rem, 1.4rem + 3vw, 3.75rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--color-white);
    text-wrap: balance;
  }

  .hero-title span {
    color: var(--color-dtb-blue);
  }

  .hero-guarantee {
    font-size: clamp(1.1rem, 0.9rem + 0.8vw, 1.35rem);
    font-weight: 500;
    color: var(--color-slate-200);
    margin-block-end: 1rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
  }

  .hero-description {
    color: var(--color-slate-300);
    font-size: 1.025rem;
    max-inline-size: 62ch;
    margin-block-end: 2rem;
  }

  .hero-cta-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-block-end: 2.75rem;
  }

  .hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    padding-block-start: 1.75rem;
    border-block-start: 1px solid rgba(255, 255, 255, 0.12);
  }

  .stat-item {
    display: flex;
    flex-direction: column;
  }

  .stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-white);
  }

  .stat-label {
    font-size: 0.78rem;
    color: var(--color-slate-300);
    margin-block-start: 0.15rem;
  }

  .hero-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-visual-card {
    position: relative;
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.01));
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.55);
    overflow: hidden;
    inline-size: 100%;
  }

  .hero-macro-img {
    inline-size: 100%;
    border-radius: var(--radius-lg);
    object-fit: cover;
  }

  .hero-floating-badge {
    position: absolute;
    inset-block-start: 1.5rem;
    inset-inline-start: 1.5rem;
    background-color: rgba(10, 13, 18, 0.88);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-inline-start: 4px solid var(--color-dtb-blue);
    padding-block: 0.75rem;
    padding-inline: 1rem;
    border-radius: var(--radius-md);
  }

  .hero-floating-badge strong {
    display: block;
    font-size: 0.875rem;
    color: var(--color-white);
  }

  .hero-floating-badge span {
    font-size: 0.75rem;
    color: var(--color-slate-300);
  }

  /* Section Headers & Layout */
  .section {
    padding-block: 5rem;
  }

  .section-alt {
    background-color: var(--color-white);
    border-block: 1px solid var(--border-subtle);
  }

  .section-dark {
    background-color: var(--surface-dark);
    color: var(--color-white);
  }

  .section-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1.5rem;
    margin-block-end: 3rem;
  }

  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-dtb-blue-dark);
    margin-block-end: 0.5rem;
  }

  .section-dark .section-tag {
    color: #6cc0f7;
  }

  .section-tag::before {
    content: "";
    display: inline-block;
    inline-size: 1.5rem;
    block-size: 2px;
    background-color: var(--color-dtb-red);
  }

  .section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 1.2rem + 2vw, 2.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    text-wrap: balance;
  }

  .section-subtitle {
    color: var(--text-secondary);
    max-inline-size: 65ch;
    margin-block-start: 0.65rem;
    font-size: 1.025rem;
  }

  .section-dark .section-subtitle {
    color: var(--color-slate-300);
  }

  /* About Section (Page 2) */
  .about-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 3.5rem;
    align-items: start;
  }

  .about-visual-box {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .about-image-frame {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-subtle);
  }

  .about-quote-card {
    background: linear-gradient(135deg, var(--color-slate-900), var(--color-slate-800));
    color: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border-inline-start: 5px solid var(--color-dtb-blue);
  }

  .about-quote-title {
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--color-white);
    margin-block-end: 0.5rem;
  }

  .about-content-cards {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .info-card {
    background-color: var(--color-slate-50);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
  }

  .info-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-dtb-blue-dark);
    margin-block-end: 0.75rem;
  }

  .info-card p:not(:last-child) {
    margin-block-end: 1rem;
  }

  .pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-block-start: 0.5rem;
  }

  .pillar-chip {
    background-color: var(--color-white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
    box-shadow: var(--shadow-sm);
  }

  .pillar-chip strong {
    display: block;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-block-end: 0.25rem;
  }

  .pillar-chip span {
    font-size: 0.8rem;
    color: var(--text-secondary);
  }

  /* Surface Design Section (Page 3 - Dual Square SEM Layout from DTB_UK_2026_NEW.pdf) */
  .surface-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .surface-sem-card {
    background-color: var(--color-white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
  }

  .surface-sem-card img {
    margin-inline: auto;
    max-block-size: 420px;
    object-fit: contain;
    border-radius: var(--radius-sm);
  }

  .surface-sem-caption {
    margin-block-start: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
  }

  .surface-cards-stack {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .surface-detail-card {
    background-color: var(--color-white);
    border: 1px solid var(--border-subtle);
    border-inline-start: 5px solid var(--color-dtb-blue);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
  }

  .surface-detail-card.active-surface {
    border-inline-start-color: var(--color-dtb-purple);
  }

  .surface-detail-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin-block-end: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .surface-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding-block: 0.25rem;
    padding-inline: 0.65rem;
    border-radius: var(--radius-pill);
    background-color: var(--color-dtb-blue-soft);
    color: var(--color-dtb-blue-dark);
  }

  .surface-detail-card.active-surface .surface-tag {
    background-color: var(--color-dtb-purple-soft);
    color: var(--color-dtb-purple);
  }

  .surface-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-block-start: 1.25rem;
  }

  .surface-highlight-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-slate-700);
  }

  /* Key Features Implant Design (Pages 4 & 5) */
  .anatomy-layout {
    display: grid;
    grid-template-columns: 1fr 320px 1fr;
    gap: 2rem;
    align-items: center;
    margin-block-end: 4rem;
  }

  .anatomy-column {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .feature-callout-card {
    background-color: var(--color-slate-50);
    border: 1px solid var(--border-subtle);
    border-block-start: 3px solid var(--color-dtb-red);
    border-radius: var(--radius-md);
    padding: 1.35rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  }

  .feature-callout-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background-color: var(--color-white);
  }

  .feature-callout-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-dtb-red);
    margin-block-end: 0.45rem;
  }

  .feature-callout-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
  }

  .anatomy-center-stage {
    background: radial-gradient(circle, rgba(60, 145, 204, 0.12) 0%, rgba(255, 255, 255, 0) 70%);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .anatomy-center-stage img {
    max-block-size: 520px;
    width: auto;
    filter: drop-shadow(0 18px 28px rgba(15, 23, 42, 0.22));
  }

  .bone-level-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .showcase-split-card {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 1.5rem;
    align-items: center;
    background-color: var(--color-slate-50);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
  }

  .showcase-split-card img {
    max-block-size: 200px;
    margin-inline: auto;
    object-fit: contain;
  }

  .showcase-split-card h3 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    margin-block-end: 0.5rem;
  }

  .showcase-split-card h3 span {
    color: var(--color-dtb-red);
  }

  /* Product Catalog & Search Landmark (Pages 6–30) */
  .catalog-controls-panel {
    background-color: var(--color-white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    margin-block-end: 2.25rem;
  }

  .catalog-search-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    margin-block-end: 1.25rem;
  }

  .search-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
  }

  .search-icon {
    position: absolute;
    inset-inline-start: 1rem;
    color: var(--text-muted);
    pointer-events: none;
  }

  .search-input {
    inline-size: 100%;
    padding-block: 0.8rem;
    padding-inline: 2.75rem 1rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    background-color: var(--color-slate-50);
    transition: border-color 0.2s ease, background-color 0.2s ease;
  }

  .search-input:focus {
    background-color: var(--color-white);
    border-color: var(--color-dtb-blue);
    outline: none;
  }

  .category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding-block-end: 1.15rem;
    border-block-end: 1px solid var(--border-subtle);
    margin-block-end: 1.15rem;
  }

  .cat-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding-block: 0.55rem;
    padding-inline: 1rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-subtle);
    background-color: var(--color-slate-50);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
  }

  .cat-tab-btn:hover {
    border-color: var(--color-dtb-blue);
    color: var(--text-primary);
  }

  .cat-tab-btn[aria-pressed="true"] {
    background-color: var(--color-slate-900);
    border-color: var(--color-slate-900);
    color: var(--color-white);
  }

  .cat-count {
    font-size: 0.72rem;
    padding-block: 0.1rem;
    padding-inline: 0.45rem;
    border-radius: var(--radius-pill);
    background-color: rgba(100, 116, 139, 0.18);
  }

  .cat-tab-btn[aria-pressed="true"] .cat-count {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
  }

  /* Platform Filter Pills using modern :has(:checked) */
  .platform-filters-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }

  .platform-pill-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
  }

  .platform-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding-block: 0.4rem;
    padding-inline: 0.85rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-subtle);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    transition: all 0.15s ease;
  }

  .platform-pill input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
  }

  .platform-pill:hover {
    border-color: var(--border-strong);
    background-color: var(--color-slate-50);
  }

  .platform-pill:has(:checked) {
    background-color: var(--color-dtb-blue-soft);
    border-color: var(--color-dtb-blue);
    color: var(--color-dtb-blue-dark);
  }

  .platform-pill[data-platform="ultra-mini"]:has(:checked) {
    background-color: var(--color-dtb-purple-soft);
    border-color: var(--color-dtb-purple);
    color: var(--color-dtb-purple);
  }

  .platform-pill[data-platform="surgical"]:has(:checked) {
    background-color: var(--color-dtb-amber-soft);
    border-color: #d98200;
    color: #9e5d00;
  }

  .platform-pill[data-platform="biomaterial"]:has(:checked) {
    background-color: var(--color-dtb-red-soft);
    border-color: var(--color-dtb-red);
    color: var(--color-dtb-red);
  }

  .pill-swatch {
    inline-size: 0.6rem;
    block-size: 0.6rem;
    border-radius: var(--radius-pill);
  }

  .catalog-results-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
  }

  /* Product Catalog Cards & Containment (modern-web-guidance: interactions-in-complex-layouts) */
  .catalog-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

  .product-group-card {
    background-color: var(--color-white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease;
    content-visibility: auto;
    contain-intrinsic-size: auto 900px auto 420px;
  }

  @supports not (content-visibility: auto) {
    .product-group-card {
      contain: layout style paint;
    }
  }

  .product-group-card:hover {
    box-shadow: var(--shadow-md);
  }

  /* Authentic Angled Ribbon Banner from DTB PDF Catalog */
  .catalog-ribbon-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 0.9rem;
    padding-inline: 1.5rem;
    color: var(--color-white);
    background-color: var(--color-dtb-blue);
    border-block-end: 3px solid rgba(0, 0, 0, 0.12);
  }

  .product-group-card[data-platform="ultra-mini"] .catalog-ribbon-bar {
    background-color: var(--color-dtb-purple);
  }

  .product-group-card[data-platform="accessory"] .catalog-ribbon-bar {
    background-color: var(--color-dtb-grey);
  }

  .product-group-card[data-platform="surgical"] .catalog-ribbon-bar {
    background-color: var(--color-dtb-amber);
    color: var(--color-slate-900);
  }

  .product-group-card[data-platform="biomaterial"] .catalog-ribbon-bar {
    background-color: var(--color-dtb-red);
  }

  .ribbon-title-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .ribbon-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-transform: uppercase;
  }

  .ribbon-meta {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.78rem;
    font-weight: 600;
  }

  .ribbon-page-badge {
    padding-block: 0.2rem;
    padding-inline: 0.65rem;
    border-radius: var(--radius-pill);
    background-color: rgba(255, 255, 255, 0.2);
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.35);
    color: inherit;
    font-weight: 700;
    font-size: 0.75rem;
  }

  .ribbon-page-badge:hover {
    background-color: rgba(255, 255, 255, 0.32);
  }

  .product-group-body {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 1.75rem;
    padding: 1.5rem;
    align-items: start;
  }

  .product-group-desc {
    font-size: 0.925rem;
    color: var(--text-secondary);
    margin-block-end: 1.15rem;
    max-inline-size: 80ch;
  }

  .product-visual-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--color-slate-50);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    min-block-size: 220px;
    text-align: center;
  }

  .product-Group-biomaterial .product-visual-panel {
    background-color: var(--color-obsidian);
    color: var(--color-white);
  }

  .product-visual-panel img {
    max-block-size: 210px;
    width: auto;
    object-fit: contain;
    margin-block-end: 0.85rem;
  }

  /* Responsive Table Implementation (modern-web-guidance: responsive-table) */
  .table-wrapper {
    overflow: auto;
    max-inline-size: 100%;
    max-block-size: min(460px, 75vh);
    container-type: inline-size;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
  }

  .spec-table {
    inline-size: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.875rem;
    text-align: start;
  }

  .spec-table caption {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  /* Sticky column headers (desktop) */
  .spec-table thead {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background-color: var(--color-slate-100);
  }

  .spec-table th,
  .spec-table td {
    padding-block: 0.65rem;
    padding-inline: 0.9rem;
    border-block-end: 1px solid var(--border-subtle);
  }

  .spec-table thead th {
    font-weight: 700;
    color: var(--color-slate-700);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-block-end: 2px solid var(--border-strong);
  }

  /* Sticky row headers (desktop) */
  .spec-table tbody th {
    position: sticky;
    inset-inline-start: 0;
    z-index: 1;
    background-color: var(--color-white);
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--color-slate-900);
    border-inline-end: 1px solid var(--border-subtle);
  }

  .spec-table tbody tr:hover td,
  .spec-table tbody tr:hover th {
    background-color: var(--color-dtb-blue-soft);
  }

  /* Container Query Stacked Table for Narrow Containers (< 600px) */
  @container (width < 600px) {
    .spec-table,
    .spec-table thead,
    .spec-table tbody,
    .spec-table tr,
    .spec-table th,
    .spec-table td {
      display: block;
    }

    .spec-table thead {
      /* MANDATORY: Hide column header from layout and screen readers */
      display: none;
    }

    .spec-table tbody tr {
      margin-block-end: 1rem;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-sm);
    }

    .spec-table tbody th {
      position: sticky;
      inset-block-start: 0;
      z-index: 2;
      background-color: var(--color-slate-100);
      border-inline-end: none;
    }

    .spec-table td:nth-child(2)::before {
      content: var(--label-2) ": ";
      font-weight: 700;
      color: var(--text-secondary);
    }

    .spec-table td:nth-child(3)::before {
      content: var(--label-3) ": ";
      font-weight: 700;
      color: var(--text-secondary);
    }

    .spec-table td:nth-child(4)::before {
      content: var(--label-4) ": ";
      font-weight: 700;
      color: var(--text-secondary);
    }

    .spec-table td:nth-child(5)::before {
      content: var(--label-5) ": ";
      font-weight: 700;
      color: var(--text-secondary);
    }

    .spec-table td:nth-child(6)::before {
      content: var(--label-6) ": ";
      font-weight: 700;
      color: var(--text-secondary);
    }
  }

  .add-sku-btn {
    padding-block: 0.28rem;
    padding-inline: 0.65rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background-color: var(--color-white);
    font-size: 0.76rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
  }

  .add-sku-btn:hover:not(:disabled) {
    background-color: var(--color-dtb-blue);
    border-color: var(--color-dtb-blue);
    color: var(--color-white);
  }

  .add-sku-btn[data-added="true"] {
    background-color: #16a34a;
    border-color: #16a34a;
    color: var(--color-white);
  }

  /* Surgical Kit Section (Pages 27–29) */
  .surgical-showcase-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 2.5rem;
    align-items: center;
  }

  .kit-Interactive-frame {
    background-color: var(--color-white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
  }

  .kit-color-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-block-start: 1.25rem;
    justify-content: center;
  }

  .kit-color-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 700;
    padding-block: 0.3rem;
    padding-inline: 0.7rem;
    border-radius: var(--radius-pill);
    background-color: var(--color-slate-100);
  }

  /* Biomaterials Section (Page 30 Dark Aesthetic) */
  .biomaterials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
  }

  .bio-card {
    background: linear-gradient(145deg, #131924, #0c1017);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-xl);
    padding: 2.25rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1.75rem;
  }

  .bio-card-top {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 1.5rem;
    align-items: center;
  }

  .bio-card h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-white);
    margin-block-end: 0.85rem;
  }

  .bio-card p {
    color: var(--color-slate-300);
    font-size: 0.925rem;
    margin-block-end: 0.75rem;
  }

  .bio-red-pill-bar {
    background-color: var(--color-dtb-red);
    color: var(--color-white);
    text-align: center;
    font-weight: 800;
    font-size: 0.95rem;
    padding-block: 0.55rem;
    border-radius: var(--radius-pill);
    margin-block-end: 1rem;
    letter-spacing: 0.03em;
  }

  .bio-sizes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 0.75rem;
    text-align: center;
  }

  .bio-size-box {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    padding: 0.85rem 0.5rem;
  }

  .bio-size-box strong {
    display: block;
    font-size: 1.05rem;
    color: var(--color-white);
  }

  .bio-size-box span {
    display: block;
    font-size: 0.78rem;
    color: var(--color-slate-300);
    margin-block-start: 0.25rem;
  }

  /* Contact & UK Headquarters Section (Page 32) */
  .contact-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 3rem;
  }

  .hq-card {
    background: linear-gradient(150deg, var(--color-obsidian), var(--color-slate-900));
    color: var(--color-white);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 2rem;
  }

  .hq-detail-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .hq-detail-item strong {
    display: block;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-dtb-blue);
    margin-block-end: 0.2rem;
  }

  .hq-detail-item span,
  .hq-detail-item a {
    font-size: 1.05rem;
    color: var(--color-white);
  }

  .contact-form-card {
    background-color: var(--color-white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
  }

  .form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.15rem;
  }

  .form-field {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .form-field.full-width {
    grid-column: 1 / -1;
  }

  .form-field label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-slate-700);
  }

  .form-field input,
  .form-field select,
  .form-field textarea {
    padding-block: 0.7rem;
    padding-inline: 0.9rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background-color: var(--color-slate-50);
    font-size: 0.925rem;
  }

  .form-field input:focus,
  .form-field select:focus,
  .form-field textarea:focus {
    background-color: var(--color-white);
    border-color: var(--color-dtb-blue);
    outline: none;
  }

  /* Native Modal Dialogs with Light Dismiss (modern-web-guidance: light-dismiss-a-dialog) */
  dialog {
    margin: auto;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 0;
    background-color: var(--color-white);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    inline-size: min(920px, 94vw);
    max-block-size: 90dvh;
    overflow: hidden;
  }

  dialog::backdrop {
    background-color: rgba(10, 13, 18, 0.72);
    backdrop-filter: blur(4px);
  }

  .dialog-inner {
    display: flex;
    flex-direction: column;
    max-block-size: 90dvh;
  }

  .dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 1.15rem;
    padding-inline: 1.5rem;
    background-color: var(--color-slate-900);
    color: var(--color-white);
  }

  .dialog-header h2 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
  }

  .dialog-body {
    padding: 1.5rem;
    overflow-y: auto;
  }

  .dialog-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 1rem;
    padding-inline: 1.5rem;
    background-color: var(--color-slate-50);
    border-block-start: 1px solid var(--border-subtle);
  }

  /* Digital Catalog Flipbook Viewer inside Dialog */
  .flipbook-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-block-end: 1rem;
  }

  .flipbook-stage {
    background-color: var(--color-obsidian);
    border-radius: var(--radius-lg);
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-block-size: 480px;
  }

  .flipbook-stage img {
    max-block-size: 68dvh;
    width: auto;
    border-radius: var(--radius-sm);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
  }

  /* Footer */
  .site-footer {
    background-color: var(--color-obsidian);
    color: var(--color-slate-300);
    padding-block: 4rem 2rem;
    border-block-start: 3px solid var(--color-dtb-red);
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 2.5rem;
    padding-block-end: 3rem;
    border-block-end: 1px solid rgba(255, 255, 255, 0.1);
  }

  .footer-col h3 {
    font-family: var(--font-display);
    color: var(--color-white);
    font-size: 0.95rem;
    font-weight: 700;
    margin-block-end: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
  }

  .footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    font-size: 0.875rem;
  }

  .footer-col a:hover {
    color: var(--color-white);
  }

  .footer-bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block-start: 1.75rem;
    font-size: 0.825rem;
    color: var(--color-slate-500);
  }

  /* Responsive Breakpoints */
  @media (width < 1024px) {
    .hero-grid,
    .about-grid,
    .surface-grid,
    .surgical-showcase-grid,
    .biomaterials-grid,
    .contact-grid,
    .bone-level-banner {
      grid-template-columns: 1fr;
    }

    .anatomy-layout {
      grid-template-columns: 1fr;
    }

    .anatomy-center-stage {
      order: -1;
    }

    .product-group-body {
      grid-template-columns: 1fr;
    }

    .product-visual-panel {
      order: -1;
    }

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

  @media (width < 768px) {
    .main-nav {
      display: none;
    }

    .main-nav.is-open {
      display: block;
      position: absolute;
      inset-block-start: 100%;
      inset-inline: 0;
      background-color: var(--color-obsidian);
      padding: 1.25rem;
      border-block-end: 1px solid rgba(255, 255, 255, 0.15);
    }

    .main-nav.is-open ul {
      flex-direction: column;
      align-items: flex-start;
      gap: 0.85rem;
    }

    .mobile-menu-btn {
      display: inline-flex;
    }

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

    .pillars-grid,
    .form-grid,
    .footer-grid,
    .bio-card-top,
    .showcase-split-card {
      grid-template-columns: 1fr;
    }
  }
}