:root {
      --ink: #182430;
      --ink-soft: #526272;
      --teal: #159d9c;
      --teal-dark: #087476;
      --teal-pale: #e8f8f6;
      --violet: #8a79f2;
      --violet-pale: #f0edff;
      --amber: #f4ae59;
      --line: #dce8e8;
      --paper: #ffffff;
      --mist: #f4f9f8;
      --shadow: 0 20px 60px rgba(22, 76, 82, .12);
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }

    body {
      margin: 0;
      color: var(--ink);
      background:
        radial-gradient(circle at 9% 2%, rgba(21, 157, 156, .10), transparent 24rem),
        linear-gradient(180deg, #f7fbfa 0, #ffffff 35rem);
      font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
      line-height: 1.72;
      -webkit-font-smoothing: antialiased;
    }

    a { color: var(--teal-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
    a:hover { color: var(--violet); }

    .wrap { width: min(100% - 32px, 1120px); margin: 0 auto; padding: 34px 0 76px; }

    .article {
      overflow: hidden;
      background: var(--paper);
      border: 1px solid rgba(188, 215, 214, .9);
      border-radius: 28px;
      box-shadow: var(--shadow);
    }

    .hero {
      display: grid;
      grid-template-columns: minmax(0, 1.12fr) minmax(330px, .88fr);
      gap: 34px;
      align-items: stretch;
      padding: clamp(28px, 6vw, 74px);
      background: linear-gradient(120deg, #f9fffe 0%, #eefafa 57%, #f1efff 100%);
      border-bottom: 1px solid var(--line);
    }

    .kicker {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      margin: 0 0 18px;
      color: var(--teal-dark);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: .16em;
      text-transform: uppercase;
    }

    .kicker::before {
      content: "";
      width: 31px;
      height: 3px;
      border-radius: 9px;
      background: var(--violet);
    }

    h1, h2, h3 { line-height: 1.16; color: var(--ink); }
    h1 { max-width: 720px; margin: 0; font-size: clamp(2.2rem, 5vw, 4.1rem); letter-spacing: -.055em; }
    h2 { margin: 58px 0 18px; font-size: clamp(1.55rem, 3vw, 2.35rem); letter-spacing: -.025em; }
    h3 { margin: 0 0 10px; font-size: 1.16rem; }

    .lead { max-width: 700px; margin: 22px 0 0; color: var(--ink-soft); font-size: clamp(1.04rem, 2vw, 1.22rem); }

    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 18px;
      margin-top: 24px;
      color: var(--ink-soft);
      font-size: .9rem;
    }

    .hero-link {
      display: inline-flex;
      margin-top: 30px;
      padding: 12px 17px;
      color: #ffffff;
      background: var(--teal-dark);
      border-radius: 999px;
      font-weight: 700;
      text-decoration: none;
      box-shadow: 0 9px 22px rgba(8, 116, 118, .18);
    }

    .hero-link:hover { color: #ffffff; background: var(--violet); }

    .led-visual {
      position: relative;
      min-height: 350px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 28px;
      background: #112f38;
      border-radius: 26px;
      isolation: isolate;
    }

    .led-visual::before,
    .led-visual::after {
      content: "";
      position: absolute;
      border-radius: 50%;
      filter: blur(3px);
      opacity: .75;
      z-index: -1;
    }

    .led-visual::before {
      width: 240px;
      height: 240px;
      background: radial-gradient(circle, rgba(21, 200, 190, .85), rgba(21, 157, 156, 0) 68%);
      transform: translate(-74px, -60px);
    }

    .led-visual::after {
      width: 210px;
      height: 210px;
      background: radial-gradient(circle, rgba(138, 121, 242, .9), rgba(138, 121, 242, 0) 70%);
      transform: translate(104px, 74px);
    }

    .visual-core {
      position: relative;
      width: min(100%, 285px);
      aspect-ratio: 1;
      display: grid;
      place-items: center;
      border: 1px solid rgba(255,255,255,.28);
      border-radius: 50%;
      box-shadow: 0 0 0 18px rgba(255,255,255,.04), 0 0 0 44px rgba(255,255,255,.025);
    }

    .visual-core::before,
    .visual-core::after {
      content: "";
      position: absolute;
      border: 1px solid rgba(255,255,255,.22);
      border-radius: 50%;
    }

    .visual-core::before { inset: 30px; }
    .visual-core::after { inset: 62px; border-color: rgba(255,255,255,.34); }

    .visual-label { color: #ffffff; text-align: center; letter-spacing: .08em; }
    .visual-label strong { display: block; font-size: 2.4rem; letter-spacing: -.04em; }
    .visual-label span { color: #a8e4e1; font-size: .8rem; text-transform: uppercase; }

    .light-tags {
      position: absolute;
      right: 20px;
      bottom: 20px;
      left: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 7px;
      justify-content: center;
    }

    .light-tags span {
      padding: 5px 9px;
      color: #ffffff;
      background: rgba(255,255,255,.12);
      border: 1px solid rgba(255,255,255,.22);
      border-radius: 999px;
      font-size: .7rem;
      letter-spacing: .05em;
    }

    .body { padding: 0 clamp(24px, 7vw, 82px) 76px; }

    .answer-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.25fr) minmax(240px, .75fr);
      gap: 20px;
      margin: 36px 0 30px;
    }

    .answer, .takeaway { padding: 25px; border-radius: 18px; }
    .answer { background: var(--teal-pale); border: 1px solid #c6e9e5; }
    .answer strong { display: block; margin-bottom: 8px; color: var(--teal-dark); }
    .answer p, .takeaway p { margin: 0; }

    .takeaway { color: #eefefe; background: #183c46; }
    .takeaway strong { display: block; margin-bottom: 11px; color: #91e3dd; }

    .toc {
      display: grid;
      grid-template-columns: 150px 1fr;
      gap: 20px;
      align-items: start;
      margin: 32px 0 46px;
      padding: 20px 22px;
      background: #fbfcff;
      border: 1px solid #e4e3f6;
      border-radius: 16px;
    }

    .toc-title { margin: 0; color: var(--violet); font-weight: 800; text-transform: uppercase; letter-spacing: .08em; font-size: .82rem; }
    .toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 5px 24px; margin: 0; padding-left: 20px; }
    .toc li { margin: 0; }

    p { margin: 0 0 16px; }
    .muted { color: var(--ink-soft); }

    .definition {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin: 24px 0;
    }

    .definition-card {
      padding: 23px;
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 16px;
    }

    .definition-card.accent { background: var(--violet-pale); border-color: #ded8ff; }
    .definition-card strong { color: var(--teal-dark); }

    .indications {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 12px;
      margin: 24px 0;
    }

    .indication {
      min-height: 150px;
      padding: 19px;
      background: var(--mist);
      border-top: 4px solid var(--teal);
      border-radius: 12px;
    }

    .indication:nth-child(2) { border-top-color: var(--violet); }
    .indication:nth-child(3) { border-top-color: var(--amber); }
    .indication:nth-child(4) { border-top-color: #56a4d8; }
    .indication p { margin: 0; color: var(--ink-soft); font-size: .92rem; }

    .criteria-table {
      width: 100%;
      margin: 22px 0;
      border-collapse: collapse;
      font-size: .95rem;
    }

    .criteria-table th,
    .criteria-table td {
      padding: 15px 14px;
      border: 1px solid var(--line);
      text-align: left;
      vertical-align: top;
    }

    .criteria-table th { color: #ffffff; background: var(--teal-dark); font-weight: 800; }
    .criteria-table tr:nth-child(even) td { background: #f7fbfa; }

    .warning {
      margin: 24px 0;
      padding: 19px 21px;
      color: #59461f;
      background: #fff8e9;
      border-left: 4px solid var(--amber);
      border-radius: 10px;
    }

    .compare {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
      margin: 24px 0;
    }

    .compare-card { padding: 24px; border: 1px solid var(--line); border-radius: 16px; background: #ffffff; }
    .compare-card h3 { margin-top: 0; }
    .compare-card ul { margin: 0; padding-left: 20px; }

    .checklist {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 11px 20px;
      margin: 22px 0;
      padding: 0;
      list-style: none;
    }

    .checklist li {
      position: relative;
      padding: 12px 13px 12px 34px;
      background: #fbfdfd;
      border: 1px solid var(--line);
      border-radius: 10px;
    }

    .checklist li::before { content: "✓"; position: absolute; left: 12px; color: var(--teal); font-weight: 900; }

    .faq { margin-top: 18px; border-top: 1px solid var(--line); }
    .faq details { padding: 18px 0; border-bottom: 1px solid var(--line); }
    .faq summary { cursor: pointer; color: var(--teal-dark); font-weight: 800; }
    .faq details p { margin: 12px 0 0; color: var(--ink-soft); }

    .cta {
      margin-top: 50px;
      padding: 29px;
      color: #ffffff;
      background: linear-gradient(135deg, #163c46, #277d80 70%, #6f61ce);
      border-radius: 20px;
    }

    .cta h2 { margin-top: 0; color: #ffffff; }
    .cta p { color: #e4ffff; }
    .cta a { color: #ffffff; font-weight: 800; }

    .note { margin-top: 28px; padding: 17px 19px; color: var(--ink-soft); background: #f8fbfb; border: 1px solid var(--line); border-radius: 12px; font-size: .9rem; }

    .footer { padding: 22px clamp(24px, 7vw, 82px); color: #6e8186; background: #f5fafa; border-top: 1px solid var(--line); font-size: .86rem; }

    .media-card {
      margin: 28px 0;
      padding: 12px;
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 18px;
      box-shadow: 0 12px 30px rgba(22, 76, 82, .07);
    }

    .media-card img {
      display: block;
      width: 100%;
      height: auto;
      border-radius: 12px;
      background: #eef7f7;
      object-fit: cover;
    }

    .hero-media {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-self: stretch;
      margin: 0;
      padding: 12px;
      background: rgba(255, 255, 255, .72);
      border-color: rgba(159, 205, 203, .85);
    }

    .hero-media img { aspect-ratio: 3 / 2; object-fit: cover; }

    .media-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
      margin: 26px 0;
    }

    .media-grid .media-card { margin: 0; }

    .media-caption {
      margin: 10px 3px 2px;
      color: var(--ink-soft);
      font-size: .78rem;
      line-height: 1.45;
    }

    .media-caption strong { color: var(--teal-dark); }

    @media (max-width: 850px) {
      .hero, .answer-grid, .definition, .compare { grid-template-columns: 1fr; }
      .led-visual { min-height: 290px; }
      .indications { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .media-grid { grid-template-columns: 1fr; }
      .toc { grid-template-columns: 1fr; }
    }

    @media (max-width: 620px) {
      .wrap { width: min(100% - 18px, 1120px); padding-top: 16px; }
      .article { border-radius: 17px; }
      .hero { padding: 28px 22px; }
      .body { padding-bottom: 44px; }
      .toc ol, .checklist, .indications { grid-template-columns: 1fr; }
      .criteria-table { display: block; overflow-x: auto; }
      .criteria-table th, .criteria-table td { min-width: 180px; }
    }