:root {
    --background: #ffffff;
    --surface: #ffffff;
    --surface-soft: #fafafa;
    --surface-dark: #111514;

    --text: #202725;
    --text-soft: #66706c;

    --border: #e3e3e3;
    --border-dark: rgba(255, 255, 255, 0.12);

    --gold: #b8904f;
    --gold-dark: #81612f;
    --gold-soft: #f7f2e9;

    --green: #315e4e;
    --green-soft: #edf3f0;

    --blue: #365f7a;
    --blue-soft: #eef3f6;

    --red: #884c45;
    --red-soft: #f7efed;

    --shadow-sm: 0 8px 28px rgba(30, 35, 32, 0.06);
    --shadow-md: 0 20px 60px rgba(30, 35, 32, 0.1);

    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 28px;

    --content-width: 920px;
    --sidebar-width: 260px;
  }

  * {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
    scroll-padding-top: 95px;
  }

  body {
    margin: 0;
    color: var(--text);
    background: #ffffff;
    font-family:
      Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
      Helvetica, Arial, sans-serif;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }

  a {
    color: inherit;
  }

  img {
    display: block;
    max-width: 100%;
    height: auto;
  }

  figure {
    padding: 0;
  }

  ::selection {
    color: #ffffff;
    background: var(--gold-dark);
  }

  /* Scroll progress */

  .scroll-progress {
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    width: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--gold), #e4c386);
    box-shadow: 0 0 12px rgba(184, 144, 79, 0.5);
  }

  /* Top navigation */

  .topbar {
    position: sticky;
    z-index: 900;
    top: 0;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
  }

  .topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(100% - 40px, 1240px);
    min-height: 68px;
    margin: 0 auto;
    gap: 24px;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
  }

  .brand-mark {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border: 1px solid rgba(184, 144, 79, 0.5);
    border-radius: 50%;
    color: var(--gold-dark);
    background: var(--gold-soft);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 19px;
    font-weight: 700;
  }

  .brand-text {
    font-family: Georgia, "Times New Roman", serif;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 0.02em;
  }

  .topbar-meta {
    color: var(--text-soft);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  /* Hero cover */

  .hero {
    position: relative;
    display: flex;
    min-height: 700px;
    overflow: hidden;
    align-items: center;
    padding: 96px 20px 88px;
    color: #ffffff;

    background-image:
      linear-gradient(
        90deg,
        rgba(7, 11, 10, 0.98) 0%,
        rgba(7, 11, 10, 0.94) 23%,
        rgba(7, 11, 10, 0.82) 42%,
        rgba(7, 11, 10, 0.56) 57%,
        rgba(7, 11, 10, 0.2) 74%,
        rgba(7, 11, 10, 0.04) 100%
      ),
      url("/files/647509fe4901fc7bf1082e33c7ea1d592686f279ee243add1cb826bd0e6451a9.webp");

    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
  }

  .hero::before {
    position: absolute;
    z-index: 1;
    inset: 0;
    content: "";
    pointer-events: none;

    background:
      linear-gradient(
        180deg,
        rgba(0, 0, 0, 0.1) 0%,
        transparent 38%,
        rgba(0, 0, 0, 0.32) 100%
      );
  }

  .hero::after {
    position: absolute;
    z-index: 1;
    top: -190px;
    left: -180px;
    width: 600px;
    height: 600px;
    content: "";
    pointer-events: none;
    border-radius: 50%;

    background:
      radial-gradient(
        circle,
        rgba(184, 144, 79, 0.16) 0%,
        rgba(184, 144, 79, 0.05) 42%,
        transparent 70%
      );
  }

  .hero-inner {
    position: relative;
    z-index: 2;
    width: min(100%, 1240px);
    margin: 0 auto;
  }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    margin-bottom: 22px;
    gap: 10px;
    color: #e5c78e;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
  }

  .eyebrow::before {
    width: 38px;
    height: 1px;
    content: "";
    background: currentColor;
  }

  .hero h1 {
    max-width: 730px;
    margin: 0;
    color: #ffffff;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(44px, 6vw, 76px);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -0.045em;
    text-shadow:
      0 3px 18px rgba(0, 0, 0, 0.45),
      0 12px 50px rgba(0, 0, 0, 0.3);
  }

  .hero h1 span {
    display: block;
    margin-top: 5px;
    color: #e2c181;
  }

  .hero-lead {
    max-width: 670px;
    margin: 30px 0 0;
    color: rgba(255, 255, 255, 0.8);
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(18px, 2.2vw, 22px);
    line-height: 1.65;
    text-shadow: 0 2px 18px rgba(0, 0, 0, 0.38);
  }

  .hero-badges {
    display: flex;
    flex-wrap: wrap;
    max-width: 720px;
    margin-top: 34px;
    gap: 10px;
  }

  .hero-badge {
    padding: 9px 14px;
    border: 1px solid rgba(255, 255, 255, 0.17);
    border-radius: 999px;
    color: rgba(255, 255, 255, 0.88);
    background: rgba(10, 14, 13, 0.42);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    font-size: 13px;
    font-weight: 650;
    backdrop-filter: blur(9px);
    -webkit-backdrop-filter: blur(9px);
  }

  /* Page layout */

  .page-shell {
    display: grid;
    align-items: start;
    width: min(100% - 40px, 1240px);
    margin: 52px auto 90px;
    grid-template-columns: var(--sidebar-width) minmax(0, var(--content-width));
    justify-content: center;
    gap: 52px;
  }

  .article {
    min-width: 0;
  }

  /* Sidebar */

  .sidebar {
    position: sticky;
    top: 96px;
    max-height: calc(100vh - 120px);
    overflow: auto;
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .sidebar-title {
    margin: 0 0 16px;
    color: var(--gold-dark);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
  }

  .toc {
    display: grid;
    gap: 4px;
  }

  .toc a {
    display: block;
    padding: 8px 10px;
    border-radius: 8px;
    color: var(--text-soft);
    font-size: 13px;
    font-weight: 600;
    line-height: 1.35;
    text-decoration: none;
    transition:
      color 0.2s ease,
      background 0.2s ease,
      transform 0.2s ease;
  }

  .toc a:hover,
  .toc a.active {
    color: var(--gold-dark);
    background: var(--gold-soft);
    transform: translateX(3px);
  }

  .toc a.sub {
    padding-left: 20px;
    font-size: 12px;
    font-weight: 500;
  }

  /* Article typography */

  .article-section {
    margin-bottom: 66px;
    scroll-margin-top: 100px;
  }

  .article-section > :first-child {
    margin-top: 0;
  }

  .section-label {
    display: inline-block;
    margin-bottom: 10px;
    color: var(--gold-dark);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
  }

  h2,
  h3,
  h4 {
    color: #17201d;
    font-family: Georgia, "Times New Roman", serif;
    line-height: 1.25;
  }

  h2 {
    margin: 0 0 24px;
    font-size: clamp(32px, 4vw, 46px);
    font-weight: 500;
    letter-spacing: -0.035em;
  }

  h3 {
    margin: 36px 0 14px;
    font-size: 27px;
    font-weight: 600;
    letter-spacing: -0.02em;
  }

  h4 {
    margin: 26px 0 10px;
    font-size: 20px;
  }

  p {
    margin: 0 0 18px;
  }

  .article-intro {
    margin-bottom: 56px;
    padding: 30px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .article-intro p {
    margin: 0;
    color: #3e4744;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 20px;
    line-height: 1.75;
  }

  .drop-cap::first-letter {
    float: left;
    margin: 8px 10px 0 0;
    color: var(--gold-dark);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 66px;
    line-height: 0.78;
  }

  .lead {
    color: #39423f;
    font-size: 18px;
  }

  .muted {
    color: var(--text-soft);
  }

  /* Article images */

  .article-image {
    margin: 36px 0 42px;
  }

  .article-image img {
    width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: 0 18px 50px rgba(30, 35, 32, 0.12);
  }

  .article-image figcaption {
    max-width: 780px;
    margin: 13px auto 0;
    padding: 0 8px;
    color: var(--text-soft);
    font-size: 13px;
    line-height: 1.6;
    text-align: center;
  }

  .article-image-wide {
    width: calc(100% + 80px);
    margin-left: -40px;
  }

  /* Image 2: three-tier comparison */

  .tier-comparison-image {
    margin-top: 32px;
    margin-bottom: 0;
  }

  .tier-comparison-image img {
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
  }

  /* Image 3: entry-level movement */

  .tier-one-movement-image,
  .movement-detail-image {
    margin-top: 30px;
    margin-bottom: 34px;
  }

  .tier-one-movement-image img,
  .movement-detail-image img {
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
  }

  /* Image 4: DD3235 and SH3135 comparison */

  .movement-comparison-image {
    margin-top: 38px;
    margin-bottom: 4px;
  }

  .movement-comparison-image img {
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
  }

  /* Image 5: case and bracelet details */

  .case-materials-image {
    margin-top: 30px;
    margin-bottom: 0;
  }

  .case-materials-image img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    object-position: center;
  }

  /* Image 6: visual tells */

  .visual-tells-image {
    margin-top: 30px;
    margin-bottom: 38px;
  }

  .visual-tells-image img {
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
  }

  /* Image 7: QC workstation */

  .qc-workstation-image {
    margin-top: 30px;
    margin-bottom: 38px;
  }

  .qc-workstation-image img {
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: cover;
    object-position: center;
  }

  .movement-comparison-image figcaption,
  .visual-tells-image figcaption,
  .tier-comparison-image figcaption {
    max-width: 720px;
  }

  /* Tier overview */

  .tier-overview {
    display: grid;
    margin-top: 30px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .tier-card {
    position: relative;
    overflow: hidden;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .tier-card::before {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    content: "";
    background: var(--tier-color, var(--gold));
  }

  .tier-card.tier-one {
    --tier-color: #8c6d59;
  }

  .tier-card.tier-two {
    --tier-color: #426c75;
  }

  .tier-card.tier-three {
    --tier-color: #b8904f;
  }

  .tier-number {
    color: var(--tier-color);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
  }

  .tier-card h3 {
    margin: 10px 0;
    font-size: 22px;
  }

  .tier-card p {
    margin: 0;
    color: var(--text-soft);
    font-size: 14px;
    line-height: 1.6;
  }

  /* Section banners */

  .tier-banner {
    position: relative;
    overflow: hidden;
    margin-bottom: 34px;
    padding: 38px;
    border-radius: var(--radius-lg);
    color: #ffffff;
    background: var(--surface-dark);
    box-shadow: var(--shadow-md);
  }

  .tier-banner::after {
    position: absolute;
    top: -90px;
    right: -65px;
    width: 240px;
    height: 240px;
    content: "";
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
  }

  .tier-banner.tier-1 {
    background:
      radial-gradient(
        circle at top right,
        rgba(181, 125, 88, 0.22),
        transparent 17rem
      ),
      linear-gradient(135deg, #231d1a, #3a2e28);
  }

  .tier-banner.tier-2 {
    background:
      radial-gradient(
        circle at top right,
        rgba(83, 140, 153, 0.25),
        transparent 17rem
      ),
      linear-gradient(135deg, #132125, #213940);
  }

  .tier-banner.tier-3 {
    background:
      radial-gradient(
        circle at top right,
        rgba(210, 171, 98, 0.3),
        transparent 17rem
      ),
      linear-gradient(135deg, #171713, #393020);
  }

  .tier-banner .section-label {
    color: #e6ca95;
  }

  .tier-banner h2 {
    max-width: 720px;
    margin-bottom: 12px;
    color: #ffffff;
  }

  .tier-banner p {
    max-width: 680px;
    margin: 0;
    color: rgba(255, 255, 255, 0.7);
    font-size: 16px;
  }

  /* Cards and content blocks */

  .content-block {
    margin: 24px 0;
    padding: 28px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .content-block h3:first-child,
  .content-block h4:first-child {
    margin-top: 0;
  }

  .content-block p:last-child,
  .content-block ul:last-child,
  .content-block figure:last-child {
    margin-bottom: 0;
  }

  .feature-grid {
    display: grid;
    margin: 22px 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 15px;
  }

  .feature-card {
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #ffffff;
  }

  .feature-card strong {
    display: block;
    margin-bottom: 6px;
    color: #1d2724;
    font-size: 15px;
  }

  .feature-card span {
    display: block;
    color: var(--text-soft);
    font-size: 14px;
    line-height: 1.6;
  }

  /* Lists */

  .check-list,
  .plain-list {
    margin: 14px 0 22px;
    padding: 0;
    list-style: none;
  }

  .check-list li,
  .plain-list li {
    position: relative;
    margin: 9px 0;
    padding-left: 27px;
  }

  .check-list li::before {
    position: absolute;
    top: 0.1em;
    left: 0;
    color: var(--gold-dark);
    content: "✓";
    font-weight: 900;
  }

  .plain-list li::before {
    position: absolute;
    top: 0.78em;
    left: 5px;
    width: 6px;
    height: 6px;
    content: "";
    border-radius: 50%;
    background: var(--gold);
  }

  /* Stats */

  .stat-grid {
    display: grid;
    margin: 24px 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .stat {
    padding: 20px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-align: center;
    background: #ffffff;
  }

  .stat strong {
    display: block;
    color: var(--gold-dark);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 25px;
    line-height: 1.2;
  }

  .stat span {
    display: block;
    margin-top: 6px;
    color: var(--text-soft);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  /* Callout */

  .callout {
    position: relative;
    margin: 30px 0;
    padding: 26px 28px 26px 32px;
    border: 1px solid rgba(184, 144, 79, 0.38);
    border-radius: var(--radius-md);
    background: #ffffff;
  }

  .callout::before {
    position: absolute;
    top: 24px;
    bottom: 24px;
    left: 0;
    width: 4px;
    content: "";
    border-radius: 0 4px 4px 0;
    background: var(--gold);
  }

  .callout-title {
    display: block;
    margin-bottom: 7px;
    color: var(--gold-dark);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
  }

  .callout p:last-child {
    margin-bottom: 0;
  }

  /* Factory cards */

  .factory-grid {
    display: grid;
    margin: 25px 0;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .factory-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .factory-initials {
    display: grid;
    width: 52px;
    height: 52px;
    margin-bottom: 18px;
    place-items: center;
    border-radius: 50%;
    color: #ffffff;
    background: linear-gradient(135deg, var(--gold-dark), var(--gold));
    font-family: Georgia, "Times New Roman", serif;
    font-size: 17px;
    font-weight: 700;
  }

  .factory-card h3 {
    margin: 0 0 8px;
    font-size: 21px;
  }

  .factory-card p {
    margin: 0;
    color: var(--text-soft);
    font-size: 14px;
  }

  /* Tables */

  .table-wrap {
    overflow-x: auto;
    margin: 26px 0 34px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  table {
    width: 100%;
    min-width: 720px;
    border-collapse: collapse;
  }

  thead {
    color: #ffffff;
    background: #18201e;
  }

  th,
  td {
    padding: 16px 18px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
  }

  th {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  td {
    font-size: 14px;
  }

  tbody tr {
    background: #ffffff;
  }

  tbody tr:nth-child(even) {
    background: #fafafa;
  }

  tbody tr:last-child td {
    border-bottom: 0;
  }

  tbody tr:hover {
    background: #f8f5ef;
  }

  .comparison-table th:first-child,
  .comparison-table td:first-child {
    position: sticky;
    left: 0;
    z-index: 2;
    font-weight: 750;
    background: inherit;
  }

  .comparison-table thead th:first-child {
    background: #18201e;
  }

  /* Visual tell cards */

  .tell-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .tell-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .tell-icon {
    display: grid;
    width: 42px;
    height: 42px;
    margin-bottom: 15px;
    place-items: center;
    border-radius: 12px;
    color: var(--gold-dark);
    background: var(--gold-soft);
    font-size: 19px;
    font-weight: 800;
  }

  .tell-card h3 {
    margin: 0 0 12px;
    font-size: 21px;
  }

  .tell-level {
    display: grid;
    margin-top: 10px;
    gap: 7px;
  }

  .tell-level div {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-soft);
    background: #ffffff;
    font-size: 13px;
  }

  .tell-level strong {
    color: var(--text);
  }

  /* QC grid */

  .qc-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .qc-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
  }

  .qc-card h3 {
    display: flex;
    align-items: center;
    margin: 0 0 14px;
    gap: 10px;
    font-size: 21px;
  }

  .qc-card h3::before {
    width: 9px;
    height: 9px;
    content: "";
    border-radius: 50%;
    background: var(--gold);
    box-shadow: 0 0 0 5px var(--gold-soft);
  }

  /* FAQ */

  .faq-list {
    display: grid;
    gap: 12px;
  }

  .faq-item {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .faq-item summary {
    position: relative;
    padding: 21px 58px 21px 22px;
    cursor: pointer;
    color: #1e2825;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 18px;
    font-weight: 600;
    line-height: 1.45;
    list-style: none;
  }

  .faq-item summary::-webkit-details-marker {
    display: none;
  }

  .faq-item summary::after {
    position: absolute;
    top: 50%;
    right: 22px;
    width: 28px;
    height: 28px;
    content: "+";
    border-radius: 50%;
    color: var(--gold-dark);
    background: var(--gold-soft);
    font-family: Arial, sans-serif;
    font-size: 20px;
    font-weight: 500;
    line-height: 27px;
    text-align: center;
    transform: translateY(-50%);
  }

  .faq-item[open] summary::after {
    content: "−";
  }

  .faq-answer {
    padding: 0 22px 22px;
    color: var(--text-soft);
  }

  .faq-answer p {
    margin: 0;
  }

  /* Final choices */

  .choice-grid {
    display: grid;
    margin: 28px 0;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .choice-card {
    padding: 25px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
  }

  .choice-card .choice-tag {
    display: inline-block;
    margin-bottom: 13px;
    padding: 6px 10px;
    border-radius: 999px;
    color: var(--gold-dark);
    background: var(--gold-soft);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .choice-card h3 {
    margin: 0 0 10px;
    font-size: 21px;
  }

  .choice-card p {
    margin: 0;
    color: var(--text-soft);
    font-size: 14px;
  }

  /* Footer */

  .article-footer {
    padding: 42px;
    border-radius: var(--radius-lg);
    color: rgba(255, 255, 255, 0.76);
    background:
      radial-gradient(
        circle at top right,
        rgba(184, 144, 79, 0.24),
        transparent 18rem
      ),
      #141a18;
  }

  .article-footer h2 {
    color: #ffffff;
  }

  .article-footer p:last-child {
    margin-bottom: 0;
  }

  .site-footer {
    padding: 30px 20px 42px;
    border-top: 1px solid var(--border);
    color: var(--text-soft);
    background: #ffffff;
    text-align: center;
    font-size: 13px;
  }

  /* Back to top */

  .back-to-top {
    position: fixed;
    z-index: 800;
    right: 22px;
    bottom: 22px;
    display: grid;
    width: 46px;
    height: 46px;
    place-items: center;
    border: 1px solid rgba(184, 144, 79, 0.35);
    border-radius: 50%;
    color: var(--gold-dark);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow-sm);
    font-size: 20px;
    text-decoration: none;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition:
      opacity 0.2s ease,
      transform 0.2s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  /* Medium desktop and tablet */

  @media (max-width: 1050px) {
    .hero {
      min-height: 660px;
      background-position: 58% center;
    }

    .hero h1 {
      max-width: 670px;
    }

    .hero-lead {
      max-width: 610px;
    }

    .page-shell {
      grid-template-columns: 1fr;
    }

    .sidebar {
      display: none;
    }

    .article {
      width: min(100%, var(--content-width));
      margin: 0 auto;
    }
  }

  /* Mobile */

  @media (max-width: 760px) {
    .topbar-inner {
      width: min(100% - 28px, 1240px);
    }

    .topbar-meta {
      display: none;
    }

    .hero {
      min-height: 670px;
      padding: 72px 18px 62px;

      background-image:
        linear-gradient(
          90deg,
          rgba(7, 11, 10, 0.97) 0%,
          rgba(7, 11, 10, 0.93) 35%,
          rgba(7, 11, 10, 0.78) 60%,
          rgba(7, 11, 10, 0.4) 100%
        ),
        url("/files/647509fe4901fc7bf1082e33c7ea1d592686f279ee243add1cb826bd0e6451a9.webp");

      background-position: 64% center;
    }

    .hero::after {
      top: -120px;
      left: -280px;
    }

    .hero-inner {
      width: min(100%, 620px);
    }

    .hero h1 {
      max-width: 570px;
      font-size: clamp(39px, 11vw, 56px);
    }

    .hero-lead {
      max-width: 520px;
      font-size: 17px;
    }

    .hero-badges {
      max-width: 520px;
    }

    .hero-badge {
      padding: 8px 11px;
      font-size: 12px;
    }

    .page-shell {
      width: min(100% - 28px, 1240px);
      margin-top: 34px;
    }

    .tier-overview,
    .factory-grid,
    .choice-grid,
    .feature-grid,
    .tell-grid,
    .qc-grid {
      grid-template-columns: 1fr;
    }

    .stat-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tier-banner,
    .article-footer {
      padding: 28px 24px;
      border-radius: 20px;
    }

    .content-block,
    .article-intro {
      padding: 22px;
    }

    .article-image {
      margin: 30px 0 36px;
    }

    .article-image-wide {
      width: 100%;
      margin-left: 0;
    }

    .tier-comparison-image,
    .tier-one-movement-image,
    .movement-detail-image,
    .movement-comparison-image,
    .case-materials-image,
    .visual-tells-image,
    .qc-workstation-image {
      margin-top: 26px;
    }

    .tier-comparison-image img,
    .tier-one-movement-image img,
    .movement-detail-image img,
    .movement-comparison-image img,
    .visual-tells-image img {
      height: auto;
      aspect-ratio: auto;
      object-fit: contain;
    }

    .case-materials-image img,
    .qc-workstation-image img {
      border-radius: 14px;
    }

    .article-image figcaption {
      margin-top: 10px;
      padding: 0 4px;
      font-size: 12px;
      line-height: 1.55;
    }

    h2 {
      font-size: 34px;
    }

    h3 {
      font-size: 24px;
    }

    .article-intro p {
      font-size: 18px;
    }
  }

  /* Small mobile */

  @media (max-width: 480px) {
    .hero {
      min-height: 690px;
      padding-top: 62px;
      background-position: 61% center;

      background-image:
        linear-gradient(
          90deg,
          rgba(7, 11, 10, 0.98) 0%,
          rgba(7, 11, 10, 0.93) 45%,
          rgba(7, 11, 10, 0.72) 74%,
          rgba(7, 11, 10, 0.4) 100%
        ),
        url("/files/647509fe4901fc7bf1082e33c7ea1d592686f279ee243add1cb826bd0e6451a9.webp");
    }

    .hero h1 {
      font-size: 39px;
    }

    .hero-lead {
      font-size: 16px;
      line-height: 1.6;
    }

    .hero-badges {
      margin-top: 28px;
    }

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

    .back-to-top {
      right: 14px;
      bottom: 14px;
    }
  }

  /* Print */

  @media print {
    .topbar,
    .sidebar,
    .scroll-progress,
    .back-to-top {
      display: none !important;
    }

    body {
      background: #ffffff;
    }

    .hero {
      display: block;
      min-height: auto;
      padding: 40px;
      color: #111111;
      background: #ffffff;
    }

    .hero::before,
    .hero::after {
      display: none;
    }

    .hero h1,
    .hero h1 span,
    .hero-lead,
    .eyebrow {
      color: #111111;
      text-shadow: none;
    }

    .hero-badge {
      border-color: #cccccc;
      color: #111111;
      background: #ffffff;
      box-shadow: none;
    }

    .page-shell {
      display: block;
      width: 100%;
      margin: 0;
    }

    .article {
      width: 100%;
    }

    .content-block,
    .tier-card,
    .factory-card,
    .tell-card,
    .qc-card,
    .choice-card,
    .article-image {
      break-inside: avoid;
      box-shadow: none;
    }
  }