:root {
      --navy: #062b4f;
      --blue: #0a6fb8;
      --sky: #eaf7ff;
      --ice: #f6fbff;
      --cyan: #56c7f5;
      --text: #1d2939;
      --muted: #667085;
      --line: #d9eaf6;
      --white: #ffffff;
      --gold: #e9b75f;
      --soft-shadow: 0 18px 45px rgba(6, 43, 79, 0.11);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      color: var(--text);
      background: #ffffff;
      line-height: 1.75;
    }

    a {
      color: var(--blue);
      font-weight: 700;
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

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

    .page {
      background:
        linear-gradient(90deg, rgba(234,247,255,0.8) 0, rgba(255,255,255,0) 26%),
        linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
      overflow: hidden;
    }

    .top-strip {
      background: var(--navy);
      color: #dff4ff;
      padding: 12px 20px;
      font-size: 14px;
      letter-spacing: 0.3px;
      text-align: center;
    }

    .editorial-hero {
      max-width: 1240px;
      margin: 0 auto;
      padding: 58px 20px 42px;
      display: grid;
      grid-template-columns: 0.72fr 1.28fr;
      gap: 42px;
      align-items: stretch;
    }

    .hero-left {
      background: var(--navy);
      color: #ffffff;
      border-radius: 0 42px 42px 0;
      padding: 42px 34px;
      position: relative;
      overflow: hidden;
      min-height: 520px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--soft-shadow);
    }

    .hero-left::before {
      content: "";
      position: absolute;
      width: 260px;
      height: 260px;
      border-radius: 50%;
      border: 1px solid rgba(255,255,255,0.16);
      right: -90px;
      top: -80px;
    }

    .hero-left::after {
      content: "";
      position: absolute;
      width: 160px;
      height: 160px;
      border-radius: 50%;
      background: rgba(86,199,245,0.14);
      left: -50px;
      bottom: -40px;
    }

    .hero-label {
      position: relative;
      z-index: 1;
      display: inline-flex;
      width: fit-content;
      padding: 7px 14px;
      border: 1px solid rgba(255,255,255,0.22);
      border-radius: 999px;
      color: #c8f0ff;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.8px;
    }

    .hero-left h1 {
      position: relative;
      z-index: 1;
      font-size: clamp(38px, 5vw, 64px);
      line-height: 1.02;
      margin: 28px 0;
      letter-spacing: -1.8px;
    }

    .hero-left p {
      position: relative;
      z-index: 1;
      color: #dcefff;
      font-size: 17px;
      margin: 0;
    }

    .hero-number {
      position: relative;
      z-index: 1;
      font-size: 92px;
      line-height: 0.9;
      font-weight: 800;
      color: rgba(255,255,255,0.13);
      letter-spacing: -5px;
    }

    .hero-right {
      display: grid;
      grid-template-rows: auto 1fr;
      gap: 22px;
    }

    .hero-image-panel {
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 38px;
      padding: 16px;
      box-shadow: var(--soft-shadow);
    }

    .hero-image-panel img {
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      border-radius: 28px;
      background: var(--ice);
    }

    .hero-facts {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .fact {
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 24px;
      padding: 22px;
      box-shadow: 0 12px 28px rgba(6,43,79,0.06);
    }

    .fact strong {
      display: block;
      font-size: 28px;
      color: var(--blue);
      line-height: 1;
      margin-bottom: 10px;
    }

    .fact span {
      color: var(--muted);
      font-size: 14px;
    }

    .main-layout {
      max-width: 1240px;
      margin: 0 auto;
      padding: 28px 20px 90px;
      display: grid;
      grid-template-columns: 280px minmax(0, 1fr);
      gap: 38px;
      align-items: start;
    }

    .side-nav {
      position: sticky;
      top: 20px;
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 28px;
      padding: 22px;
      box-shadow: 0 15px 35px rgba(6,43,79,0.08);
    }

    .side-nav h2 {
      margin: 0 0 16px;
      color: var(--navy);
      font-size: 18px;
    }

    .side-nav a {
      display: block;
      padding: 11px 0;
      border-bottom: 1px solid #edf5fb;
      color: var(--muted);
      font-size: 14px;
      font-weight: 600;
    }

    .side-nav a:last-child {
      border-bottom: none;
    }

    .side-nav a:hover {
      color: var(--blue);
      text-decoration: none;
    }

    .content-flow {
      min-width: 0;
    }

    .answer-band {
      background: linear-gradient(135deg, var(--sky), #ffffff);
      border: 1px solid var(--line);
      border-radius: 32px;
      padding: 34px;
      margin-bottom: 34px;
      position: relative;
      overflow: hidden;
    }

    .answer-band::after {
      content: "Réponse";
      position: absolute;
      right: 24px;
      bottom: -18px;
      font-size: 78px;
      font-weight: 800;
      color: rgba(10,111,184,0.06);
      letter-spacing: -3px;
    }

    .answer-band h2 {
      margin: 0 0 12px;
      color: var(--navy);
      font-size: 30px;
      line-height: 1.22;
    }

    .answer-band p {
      margin: 0;
      color: var(--text);
      font-size: 17px;
      max-width: 860px;
      position: relative;
      z-index: 1;
    }

    .chapter {
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 34px;
      padding: 38px;
      margin-bottom: 34px;
      box-shadow: 0 12px 34px rgba(6,43,79,0.05);
    }

    .chapter-kicker {
      display: inline-flex;
      color: var(--blue);
      background: rgba(10,111,184,0.08);
      border-radius: 999px;
      padding: 6px 13px;
      font-weight: 700;
      font-size: 13px;
      margin-bottom: 14px;
    }

    .chapter h2 {
      margin: 0 0 18px;
      color: var(--navy);
      font-size: clamp(26px, 3vw, 40px);
      line-height: 1.18;
      letter-spacing: -0.7px;
    }

    .chapter h3 {
      color: var(--navy);
      font-size: 22px;
      margin: 28px 0 10px;
    }

    .chapter p {
      color: var(--text);
      margin: 0 0 18px;
    }

    .split-note {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 22px;
      margin-top: 28px;
    }

    .note-card {
      border-radius: 26px;
      padding: 26px;
      background: var(--ice);
      border: 1px solid var(--line);
    }

    .note-card.dark {
      background: var(--navy);
      color: #ffffff;
      border-color: var(--navy);
    }

    .note-card.dark p,
    .note-card.dark li {
      color: #dcefff;
    }

    .note-card h3 {
      margin-top: 0;
      color: inherit;
    }

    .note-card ul {
      margin: 14px 0 0;
      padding-left: 19px;
    }

    .note-card li {
      margin-bottom: 8px;
      color: var(--muted);
    }

    .skin-scale {
      margin-top: 30px;
      display: grid;
      gap: 14px;
    }

    .scale-row {
      display: grid;
      grid-template-columns: 150px 1fr 170px;
      gap: 14px;
      align-items: center;
      padding: 16px;
      border: 1px solid var(--line);
      border-radius: 20px;
      background: #ffffff;
    }

    .scale-label {
      font-weight: 800;
      color: var(--navy);
    }

    .scale-bar {
      height: 16px;
      border-radius: 999px;
      background: linear-gradient(90deg, #f8dfc9, #c38963, #6c3d2b);
      overflow: hidden;
      position: relative;
    }

    .scale-bar span {
      display: block;
      height: 100%;
      border-radius: 999px;
      background: rgba(10,111,184,0.82);
    }

    .scale-status {
      font-size: 14px;
      color: var(--muted);
      font-weight: 700;
    }

    .w30 { width: 30%; }
    .w55 { width: 55%; }
    .w76 { width: 76%; }
    .w90 { width: 90%; }

    .wavelength-board {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
      margin-top: 28px;
    }

    .wave {
      border-radius: 28px;
      padding: 28px;
      background: linear-gradient(180deg, #ffffff, var(--ice));
      border: 1px solid var(--line);
      position: relative;
      overflow: hidden;
    }

    .wave::before {
      content: "";
      position: absolute;
      right: -36px;
      top: -36px;
      width: 100px;
      height: 100px;
      border-radius: 50%;
      background: rgba(86,199,245,0.16);
    }

    .wave strong {
      display: block;
      color: var(--blue);
      font-size: 34px;
      line-height: 1;
      margin-bottom: 12px;
    }

    .wave h3 {
      margin: 0 0 10px;
      font-size: 20px;
    }

    .comparison-lanes {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 22px;
      margin-top: 30px;
    }

    .lane {
      border-radius: 30px;
      overflow: hidden;
      border: 1px solid var(--line);
      background: #ffffff;
    }

    .lane-head {
      padding: 18px 24px;
      color: #ffffff;
      font-size: 22px;
      font-weight: 800;
    }

    .lane-head.diode {
      background: var(--blue);
    }

    .lane-head.ipl {
      background: #7c99b8;
    }

    .lane-body {
      padding: 24px;
    }

    .lane-body img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      border-radius: 22px;
      background: var(--ice);
      margin-bottom: 20px;
    }

    .check-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .check-list li {
      position: relative;
      padding-left: 32px;
      margin-bottom: 12px;
      color: var(--text);
    }

    .check-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: rgba(10,111,184,0.11);
      color: var(--blue);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 13px;
    }

    .check-list.negative li::before {
      content: "!";
      background: rgba(124,153,184,0.16);
      color: #66829f;
    }

    .product-block {
      display: grid;
      grid-template-columns: 0.95fr 1.05fr;
      gap: 28px;
      align-items: center;
      background: linear-gradient(135deg, #ffffff, var(--sky));
      border: 1px solid var(--line);
      border-radius: 34px;
      padding: 26px;
      margin-top: 30px;
    }

    .product-block img {
      width: 100%;
      aspect-ratio: 1 / 1;
      object-fit: contain;
      border-radius: 28px;
      background: #ffffff;
      padding: 12px;
    }

    .product-features {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 20px;
    }

    .feature-pill {
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 16px;
      padding: 14px;
      color: var(--navy);
      font-weight: 700;
      font-size: 14px;
    }

    .protocol {
      counter-reset: step;
      display: grid;
      gap: 16px;
      margin-top: 28px;
    }

    .protocol-item {
      counter-increment: step;
      display: grid;
      grid-template-columns: 64px 1fr;
      gap: 18px;
      align-items: start;
      background: var(--ice);
      border: 1px solid var(--line);
      border-radius: 24px;
      padding: 20px;
    }

    .protocol-item::before {
      content: counter(step);
      width: 52px;
      height: 52px;
      border-radius: 18px;
      background: var(--navy);
      color: #ffffff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 800;
    }

    .protocol-item h3 {
      margin: 0 0 6px;
      font-size: 20px;
    }

    .protocol-item p {
      margin: 0;
      color: var(--muted);
    }

    .faq-list {
      display: grid;
      gap: 14px;
      margin-top: 24px;
    }

    details {
      border: 1px solid var(--line);
      border-radius: 20px;
      background: #ffffff;
      padding: 0;
      overflow: hidden;
    }

    summary {
      cursor: pointer;
      padding: 20px 22px;
      color: var(--navy);
      font-weight: 800;
      list-style: none;
      position: relative;
    }

    summary::-webkit-details-marker {
      display: none;
    }

    summary::after {
      content: "+";
      position: absolute;
      right: 22px;
      top: 18px;
      color: var(--blue);
      font-size: 24px;
    }

    details[open] summary::after {
      content: "–";
    }

    details p {
      margin: 0;
      padding: 0 22px 22px;
      color: var(--muted);
    }

    .cta-panel {
      margin-top: 36px;
      background:
        radial-gradient(circle at top right, rgba(86,199,245,0.28), transparent 32%),
        var(--navy);
      color: #ffffff;
      border-radius: 38px;
      padding: 46px;
      text-align: center;
      box-shadow: var(--soft-shadow);
    }

    .cta-panel h2 {
      margin: 0 0 14px;
      font-size: clamp(28px, 4vw, 46px);
      line-height: 1.12;
    }

    .cta-panel p {
      max-width: 760px;
      margin: 0 auto 26px;
      color: #dcefff;
    }

    .cta-panel a {
      display: inline-block;
      background: #ffffff;
      color: var(--blue);
      border-radius: 999px;
      padding: 15px 28px;
      font-weight: 800;
    }

    .disclaimer {
      margin-top: 28px;
      border-left: 4px solid var(--gold);
      background: #fffaf0;
      color: #6b5a37;
      padding: 18px 20px;
      border-radius: 14px;
      font-size: 14px;
    }

    @media (max-width: 1020px) {
      .editorial-hero {
        grid-template-columns: 1fr;
      }

      .hero-left {
        border-radius: 34px;
        min-height: auto;
      }

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

      .side-nav {
        position: relative;
        top: auto;
      }

      .side-nav a {
        display: inline-block;
        margin-right: 14px;
        border-bottom: none;
      }
    }

    @media (max-width: 780px) {
      .hero-facts,
      .split-note,
      .wavelength-board,
      .comparison-lanes,
      .product-block,
      .product-features {
        grid-template-columns: 1fr;
      }

      .chapter,
      .answer-band,
      .cta-panel {
        padding: 26px 20px;
        border-radius: 26px;
      }

      .scale-row {
        grid-template-columns: 1fr;
      }

      .protocol-item {
        grid-template-columns: 1fr;
      }
    }