:root {
      --navy:        #0d1f35;
      --navy-light:  #122845;
      --navy-mid:    #1a3355;
      --green:       #36c360;
      --green-hover: #2daa54;
      --white:       #ffffff;
      --off-white:   rgba(255,255,255,0.88);
      --muted:       rgba(255,255,255,0.55);
      --border:      rgba(255,255,255,0.10);
      --card-bg:     rgba(255,255,255,0.04);
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    html { scroll-behavior: smooth; }

    body {
      /* font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; */
      font-family: Inter, Helvetica, Arial, -apple-system, sans-serif;
      background: var(--navy);
      color: var(--off-white);
      line-height: 1.7;
      font-size: 16px;
    }

    /* ── NAV ── */
    nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--navy);
      border-bottom: 1px solid var(--border);
      padding: 0 5%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }

    .nav-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--white);
      text-decoration: none;
      letter-spacing: -0.3px;
    }

    .nav-logo span { color: var(--green); }

    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
    }

    .nav-links a {
      color: var(--muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }

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

    /* ── HERO ── */
    .hero {
      text-align: center;
      padding: 72px 5% 60px;
      border-bottom: 1px solid var(--border);
      background: linear-gradient(180deg, var(--navy-light) 0%, var(--navy) 100%);
    }

    .hero-eyebrow {
      font-size: 0.78rem;
      font-weight: 600;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: var(--green);
      margin-bottom: 16px;
    }

    .hero h1 {
      font-size: clamp(2rem, 5vw, 3rem);
      font-weight: 800;
      color: var(--white);
      line-height: 1.15;
      margin-bottom: 20px;
    }

    .hero p {
      max-width: 640px;
      margin: 0 auto;
      color: var(--muted);
      font-size: 1.05rem;
    }

    /* ── LAYOUT ── */
    .container {
      max-width: 820px;
      margin: 0 auto;
      padding: 0 5%;
    }

    .content-wrapper {
      padding: 64px 0 100px;
    }

    /* ── DISCLAIMER ── */
    .disclaimer {
      background: rgba(54, 195, 96, 0.08);
      border: 1px solid rgba(54, 195, 96, 0.25);
      border-radius: 12px;
      padding: 28px 32px;
      margin-bottom: 56px;
    }

    .disclaimer p {
      font-size: 0.92rem;
      color: var(--off-white);
      margin-bottom: 12px;
    }

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

    .disclaimer strong { color: var(--white); }

    /* ── SECTION ── */
    .section {
      margin-bottom: 48px;
    }

    .section-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 20px;
      padding-bottom: 14px;
      border-bottom: 1px solid var(--border);
    }

    .section-icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: rgba(54, 195, 96, 0.15);
      border: 1px solid rgba(54, 195, 96, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      flex-shrink: 0;
    }

    .section h2 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--white);
    }

    .section-body {
      padding-left: 52px;
    }

    /* ── FORMULA ── */
    .formula-block {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: 10px;
      padding: 18px 22px;
      margin: 14px 0 18px;
      font-size: 0.9rem;
    }

    .formula-block p {
      margin-bottom: 8px;
      color: var(--off-white);
    }

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

    .formula-block .label {
      color: var(--muted);
      font-size: 0.78rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 10px;
      display: block;
    }

    /* ── REFERENCE LIST ── */
    .ref-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .ref-list li {
      font-size: 0.88rem;
      color: var(--off-white);
      padding: 12px 16px;
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: 9px;
      transition: border-color 0.2s, background 0.2s;
    }

    .ref-list li:hover {
      border-color: rgba(54, 195, 96, 0.35);
      background: rgba(54, 195, 96, 0.05);
    }

    .ref-list .ref-authors {
      display: block;
      font-weight: 500;
      color: var(--white);
      margin-bottom: 3px;
      font-size: 0.9rem;
    }

    .ref-list .ref-detail {
      color: var(--muted);
      font-size: 0.82rem;
      margin-top: 4px;
      display: block;
    }

    /* ── LINKS ── */
    a {
      color: var(--green);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--green-hover);
      text-decoration: underline;
    }

    .plain-link {
      font-size: 0.82rem;
      color: var(--green);
      word-break: break-all;
    }

    /* ── DRI TABLE ── */
    .dri-sources {
      margin-top: 14px;
      font-size: 0.84rem;
      color: var(--muted);
      line-height: 1.8;
    }

    .dri-sources strong {
      color: var(--off-white);
    }

    /* ── DIVIDER ── */
    .divider {
      border: none;
      border-top: 1px solid var(--border);
      margin: 56px 0;
    }

    /* ── FOOTER ── */
    footer {
      border-top: 1px solid var(--border);
      padding: 36px 5%;
      text-align: center;
      color: var(--muted);
      font-size: 0.82rem;
    }

    footer a { color: var(--muted); }
    footer a:hover { color: var(--white); text-decoration: none; }

    .footer-inner {
      max-width: 820px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 14px;
    }

    .footer-logo {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--white);
    }

    .footer-links {
      display: flex;
      gap: 1.6rem;
      flex-wrap: wrap;
      justify-content: center;
    }

    /* ── RESPONSIVE ── */
    @media (max-width: 600px) {
      .section-body { padding-left: 0; }
      .nav-links { display: none; }
      .hero { padding: 48px 5% 40px; }
    }