/* ============ HERO ============ */
  .page-hero {
    padding: 180px var(--pad-x) 80px;
    background: var(--paper);
    color: var(--ink);
    border-bottom: 1px solid var(--line);
    position: relative;
    overflow: hidden;
  }

  .page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
      radial-gradient(circle at 80% 30%, rgba(143, 163, 145, 0.10), transparent 55%),
      linear-gradient(to right, rgba(26, 31, 27, 0.04) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(26, 31, 27, 0.04) 1px, transparent 1px);
    background-size: auto, 80px 80px, 80px 80px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 90%);
    pointer-events: none;
  }

  .ph-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    position: relative;
    z-index: 2;
  }

  .breadcrumbs {
    display: flex;
    gap: 8px;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    opacity: 0.6;
    margin-bottom: 32px;
  }

  .breadcrumbs .sep {
    opacity: 0.4;
  }

  .ph-title {
    font-family: var(--font-sans);
    font-size: clamp(42px, 5.5vw, 68px);
    line-height: 1.1;
    letter-spacing: -0.03em;
    font-weight: 500;
    max-width: 100%;
  }

  .ph-title em {
    font-style: normal;
    color: var(--sage-deep);
    font-weight: 500;
  }

  .ph-meta {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    margin-top: 72px;
    padding-top: 32px;
    border-top: 1px solid var(--line);
  }

  @media (max-width: 800px) {
    .ph-meta {
      grid-template-columns: 1fr 1fr;
    }
  }

  .ph-meta .lede {
    opacity: 0.78;
    max-width: 56ch;
    font-size: 16px;
    line-height: 1.55;
  }

  .ph-meta .stat .num {
    font-family: var(--font-sans);
    font-size: clamp(36px, 4vw, 56px);
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1;
  }

  .ph-meta .stat .num em {
    font-style: normal;
    color: var(--sage-deep);
    font-size: 0.65em;
  }

  .ph-meta .stat .label {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    opacity: 0.6;
    margin-top: 8px;
  }

  /* ============ CATEGORY OVERVIEW BAND ============ */
  .cat-overview {
    background: var(--paper-2, #f3efe7);
    border-bottom: 1px solid var(--line);
    padding: clamp(72px, 9vw, 120px) var(--pad-x);
  }

  .co-inner {
    max-width: var(--max-w);
    margin: 0 auto;
  }

  .co-head {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 56px;
    margin-bottom: 56px;
    align-items: end;
  }

  @media (max-width: 900px) {
    .co-head {
      grid-template-columns: 1fr;
      gap: 24px;
    }
  }

  .co-label {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    opacity: 0.55;
  }

  .co-title {
    font-family: var(--font-sans);
    font-size: clamp(34px, 4.6vw, 60px);
    line-height: 1.04;
    letter-spacing: -0.025em;
    font-weight: 500;
    margin-top: 14px;
  }

  .co-title em {
    font-style: normal;
    color: var(--sage-deep);
    font-weight: 500;
  }

  .co-desc {
    font-size: 15px;
    line-height: 1.6;
    opacity: 0.78;
    max-width: 50ch;
  }

  .co-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
  }

  @media (max-width: 1100px) {
    .co-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (max-width: 600px) {
    .co-grid {
      grid-template-columns: 1fr;
    }
  }

  .co-card {
    background: var(--paper);
    padding: 36px 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 320px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: background 0.4s var(--ease-out-expo);
    color: var(--ink);
    text-decoration: none;
  }

  .co-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(90deg, var(--accent), var(--accent)) no-repeat;
    background-size: 20% 2px;
    background-position: 0% 0%;
    animation: co-border-travel 4s linear infinite;
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
    z-index: 1;
  }

  .co-card:hover::before {
    opacity: 1;
  }

  .co-card>* {
    position: relative;
    z-index: 2;
  }

  @keyframes co-border-travel {
    0% {
      background-position: 0% 0%;
      background-size: 20% 2px;
    }

    24.9% {
      background-position: 100% 0%;
      background-size: 20% 2px;
    }

    25% {
      background-position: 100% 0%;
      background-size: 2px 20%;
    }

    49.9% {
      background-position: 100% 100%;
      background-size: 2px 20%;
    }

    50% {
      background-position: 100% 100%;
      background-size: 20% 2px;
    }

    74.9% {
      background-position: 0% 100%;
      background-size: 20% 2px;
    }

    75% {
      background-position: 0% 100%;
      background-size: 2px 20%;
    }

    99.9% {
      background-position: 0% 0%;
      background-size: 2px 20%;
    }

    100% {
      background-position: 0% 0%;
      background-size: 20% 2px;
    }
  }

  .co-card:hover {
    background: var(--ink);
    color: var(--paper);
  }

  .co-card .co-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
  }

  .co-card .co-num {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    opacity: 0.5;
  }

  .co-card .co-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid currentColor;
    border-radius: 50%;
    opacity: 0.4;
    transition: opacity 0.3s;
  }

  .co-card:hover .co-icon {
    opacity: 1;
  }

  .co-card .co-icon svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.5;
  }

  .co-card .co-name {
    font-family: var(--font-sans);
    font-size: clamp(28px, 3vw, 40px);
    line-height: 0.98;
    letter-spacing: -0.025em;
    font-weight: 500;
    margin-bottom: 18px;
  }

  .co-card .co-name em {
    font-style: normal;
    color: var(--sage-deep);
    font-weight: 500;
    transition: color 0.3s;
  }

  .co-card:hover .co-name em {
    color: var(--accent);
  }

  .co-card .co-meta {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    opacity: 0.65;
    padding-top: 14px;
    border-top: 1px solid currentColor;
    border-color: var(--line);
    transition: border-color 0.3s;
  }

  .co-card:hover .co-meta {
    border-color: rgba(244, 241, 234, 0.2);
  }

  .co-card .co-cta {
    margin-top: 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    opacity: 0.85;
  }

  .co-card .co-cta::after {
    content: '↗';
    transition: transform 0.3s;
  }

  .co-card:hover .co-cta::after {
    transform: translate(2px, -2px);
  }

  /* ============ DEEP-DIVE STACK ============ */
  .deep-stack {
    background: var(--paper);
    border-top: 1px solid var(--line);
    position: relative;
  }

  .ds-head {
    padding: clamp(80px, 10vw, 140px) var(--pad-x) clamp(48px, 6vw, 80px);
  }

  .ds-head-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 56px;
    align-items: end;
  }

  @media (max-width: 900px) {
    .ds-head-inner {
      grid-template-columns: 1fr;
      gap: 24px;
    }
  }

  .ds-title {
    font-family: var(--font-sans);
    font-size: clamp(40px, 6vw, 84px);
    line-height: 0.96;
    letter-spacing: -0.03em;
    font-weight: 500;
    margin-top: 18px;
  }

  .ds-title em {
    font-style: normal;
    color: var(--sage-deep);
    font-weight: 500;
  }

  .ds-desc {
    font-size: 15px;
    line-height: 1.6;
    opacity: 0.72;
    max-width: 50ch;
  }

  .ds-track {
    border-top: 1px solid var(--line);
  }

  .ds-panel {
    border-bottom: 1px solid var(--line);
    min-height: 100vh;
    padding: clamp(64px, 8vw, 120px) var(--pad-x);
    background: var(--paper);
    position: relative;
  }

  .ds-panel:nth-child(even) {
    background: var(--paper-2, #f3efe7);
  }

  .ds-panel.is-dark {
    background: var(--ink);
    color: var(--paper);
  }

  .ds-panel.is-dark .ds-section {
    border-color: rgba(244, 241, 234, 0.16);
  }

  .ds-panel.is-dark .ds-name-block {
    border-color: rgba(244, 241, 234, 0.16);
  }

  .ds-panel.is-dark .ds-foot {
    border-color: rgba(244, 241, 234, 0.2);
  }

  .ds-panel.is-dark .ds-num-row {
    border-color: rgba(244, 241, 234, 0.2);
  }

  .ds-panel.is-dark .ds-tag {
    color: var(--paper);
    border-color: rgba(244, 241, 234, 0.2);
    background: rgba(244, 241, 234, 0.06);
  }

  .ds-panel.is-dark .ds-tag .led {
    background: var(--accent);
  }

  .ds-panel.is-dark .sub-card {
    background: transparent;
    border-color: rgba(244, 241, 234, 0.16);
    color: var(--ink);
  }

  .ds-panel.is-dark .sub-card:hover {
    background: var(--paper-2, #f3efe7);
  }
  .ds-panel.is-dark .sub-card-head {
    color: var(--paper);
  }
  .ds-panel.is-dark .sub-card:hover .sub-card-head {
    color: var(--ink);
  }

  .ds-panel.is-dark .chip {
    background: rgba(244, 241, 234, 0.08);
    border-color: rgba(244, 241, 234, 0.2);
    color: var(--paper);
  }

  .ds-panel.is-dark .chip:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--ink);
  }

  .ds-panel.is-dark .sub-card .chip {
    background: var(--paper-2, #f3efe7);
    border-color: var(--line);
    color: var(--ink);
  }

  .ds-panel.is-dark .sub-card .chip:hover {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
  }

  .ds-panel.is-dark .ds-foot .btn-primary {
    background: var(--accent);
    color: var(--paper);
    border-color: var(--accent);
  }

  .ds-panel.is-dark .ds-foot .btn-ghost {
    color: var(--paper);
    border-color: rgba(244, 241, 234, 0.3);
  }

  .ds-panel.is-dark .ds-foot .btn-ghost:hover {
    background: var(--paper);
    color: var(--ink);
    border-color: var(--paper);
  }

  .ds-panel-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: clamp(48px, 6vw, 96px);
  }

  @media (max-width: 1000px) {
    .ds-panel-inner {
      grid-template-columns: 1fr;
      gap: 36px;
    }
  }

  .ds-identity {
    position: sticky;
    top: 96px;
    align-self: start;
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  @media (max-width: 1000px) {
    .ds-identity {
      position: static;
    }
  }

  .ds-num-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    opacity: 0.7;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--line);
  }

  .ds-num-row .n {
    color: var(--sage-deep);
    font-weight: 700;
  }

  .ds-panel.is-dark .ds-num-row .n {
    color: var(--accent);
  }

  .ds-icon-card {
    aspect-ratio: 1;
    background: rgba(143, 163, 145, 0.08);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--sage-deep);
  }

  .ds-panel.is-dark .ds-icon-card {
    background: rgba(244, 241, 234, 0.04);
    border-color: rgba(244, 241, 234, 0.16);
    color: var(--accent);
  }

  .ds-icon-card svg {
    width: 80%;
    height: 80%;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.2;
  }

  .ds-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: max-content;
    padding: 8px 14px;
    border: 1px solid var(--line);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    background: var(--paper);
  }

  .ds-tag .led {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--sage-deep);
    animation: pulse 2.4s ease-in-out infinite;
  }

  @keyframes pulse {

    0%,
    100% {
      opacity: 1;
    }

    50% {
      opacity: 0.4;
    }
  }

  .ds-content {
    display: flex;
    flex-direction: column;
    gap: clamp(32px, 4vw, 56px);
  }

  .ds-name-block {
    border-bottom: 1px solid var(--line);
    padding-bottom: clamp(24px, 3vw, 36px);
  }

  .ds-name {
    font-family: var(--font-sans);
    font-size: clamp(48px, 8vw, 124px);
    line-height: 0.92;
    letter-spacing: -0.045em;
    font-weight: 500;
  }

  .ds-name em {
    font-style: normal;
    color: var(--sage-deep);
    font-weight: 500;
  }

  .ds-panel.is-dark .ds-name em {
    color: var(--accent);
  }

  .ds-tagline {
    margin-top: 18px;
    font-size: clamp(18px, 1.6vw, 22px);
    line-height: 1.4;
    opacity: 0.78;
    max-width: 40ch;
  }

  .ds-section {
    border-top: 1px solid var(--line);
    padding-top: clamp(24px, 3vw, 32px);
  }

  .ds-section:first-of-type {
    border-top: none;
    padding-top: 0;
  }

  .ds-section-label {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--sage);
    margin-bottom: 22px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .ds-section-label .count {
    font-family: var(--font-mono);
    font-size: 10px;
    opacity: 0.6;
  }

  /* Subcategory grid — 2 col */
  .sub-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  @media (max-width: 700px) {
    .sub-grid {
      grid-template-columns: 1fr;
    }
  }

  .sub-card {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: background 0.3s, border-color 0.3s, transform 0.3s var(--ease-out-expo);
  }

  .sub-card:hover {
    background: var(--paper-2, #f3efe7);
    /* border-color: var(--ink); */
    transform: translateY(-2px);
  }

  .sub-card-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
  }

  .sub-card-name {
    font-family: var(--font-sans);
    font-size: 17px;
    font-weight: 500;
    letter-spacing: -0.015em;
    line-height: 1.15;
  }

  .sub-card-num {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.14em;
    opacity: 0.5;
    flex-shrink: 0;
  }

  .sub-card-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .chip {
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: -0.005em;
    padding: 5px 10px;
    border-radius: 4px;
    background: var(--paper-2, #f3efe7);
    border: 1px solid var(--line);
    color: var(--ink);
    transition: all 0.2s;
    cursor: pointer;
  }

  .ds-panel:nth-child(even) .chip {
    background: var(--paper);
  }

  .chip:hover {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
  }

  .sub-card .chip {
    color: var(--ink);
  }

  .sub-card .chip:hover {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
  }

  .ds-foot {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    padding-top: clamp(24px, 3vw, 32px);
    border-top: 1px solid var(--line);
    align-items: center;
  }

  .ds-foot .ds-spacer {
    flex: 1;
  }

  .ds-next {
    background: var(--ink);
    color: var(--paper);
    border: 1px solid var(--ink);
    border-radius: 100px;
    padding: 14px 24px;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.3s var(--ease-out-expo);
  }

  .ds-panel.is-dark .ds-next {
    background: var(--accent);
    color: var(--ink);
    border-color: var(--accent);
  }

  .ds-next:hover {
    transform: translateY(-2px);
    background: var(--sage-deep);
    border-color: var(--sage-deep);
  }

  .ds-next span {
    display: inline-block;
    transition: transform 0.3s;
  }

  .ds-next:hover span {
    transform: translateY(3px);
  }

  /* ============ SIDE RAIL ============ */
  .ds-rail {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s;
    background: rgba(244, 241, 234, 0.96);
    backdrop-filter: blur(20px);
    border: 1px solid var(--line);
   border-radius: 15px;
    padding: 8px;
  }

  .ds-rail.is-visible {
    opacity: 1;
    pointer-events: auto;
  }

  @media (max-width: 800px) {
    .ds-rail {
      display: none;
    }
  }

  .ds-rail-track {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .ds-dot {
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink);
    opacity: 0.45;
    transition: opacity 0.2s, background 0.2s;
    border-radius: 100px;
  }

  .ds-dot::before {
    content: "";
    display: block;
    width: 18px;
    height: 1px;
    background: currentColor;
    transition: all 0.3s var(--ease-out-expo);
  }

  .ds-dot.is-active {
    opacity: 1;
    background: rgba(143, 163, 145, 0.12);
  }

  .ds-dot.is-active::before {
    width: 28px;
    height: 2px;
    background: var(--sage-deep);
  }

  .ds-dot:hover {
    opacity: 1;
  }

  /* ============ B2B CTA ============ */
  .feat-cta {
    background: var(--ink);
    color: var(--paper);
    padding: clamp(60px, 8vw, 100px) var(--pad-x);
  }

  .fc-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 40px;
    align-items: center;
  }

  @media (max-width: 800px) {
    .fc-inner {
      grid-template-columns: 1fr;
    }
  }

  .fc-inner h3 {
    font-family: var(--font-sans);
    font-size: clamp(32px, 5vw, 64px);
    line-height: 0.95;
    font-weight: 500;
    letter-spacing: -0.02em;
  }

  .fc-inner h3 em {
    font-style: normal;
    color: var(--accent);
    font-weight: 500;
  }