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

    :root {
      --navy: #0F1B2D; --navy2: #152033; --navy3: #1C2D42; --navy4: #243348;
      --teal: #00C9A7; --teal-dim: rgba(0,201,167,0.12);
      --off-white: #F0F4F8; --muted: #8899AA; --dimmer: #556070;
      --divider: rgba(255,255,255,0.07);
      --mono: 'JetBrains Mono', monospace; --sans: 'Space Grotesk', sans-serif;
      --radius: 12px;
    }

    html { font-size: 16px; scroll-behavior: smooth; }
    body { background: var(--navy); color: var(--off-white); font-family: var(--sans); min-height: 100vh; display: flex; flex-direction: column; -webkit-font-smoothing: antialiased; }
    a { color: inherit; }

    header {
      padding: 1rem 2rem; display: flex; align-items: center; justify-content: space-between;
      border-bottom: 1px solid var(--divider); position: sticky; top: 0;
      background: rgba(15,27,45,0.96); backdrop-filter: blur(12px); z-index: 100;
    }
    .logo { display: flex; align-items: center; gap: 0.55rem; text-decoration: none; }
    .logo-mark { width: 30px; height: 30px; background: var(--teal); border-radius: 7px; display: grid; place-items: center; font-family: var(--mono); font-size: 0.7rem; font-weight: 700; color: var(--navy); }
    .logo-text { font-size: 1.05rem; font-weight: 600; letter-spacing: -0.02em; }
    .logo-text span { color: var(--teal); }
    .header-right a { color: var(--muted); text-decoration: none; font-size: 0.85rem; font-weight: 500; transition: color 0.15s; }
    .header-right a:hover { color: var(--off-white); }

    .btn { border: none; border-radius: 8px; font-family: var(--sans); font-weight: 600; cursor: pointer; transition: opacity 0.15s, transform 0.1s; display: inline-flex; align-items: center; gap: 0.4rem; white-space: nowrap; text-decoration: none; }
    .btn:hover { opacity: 0.85; }
    .btn:active { transform: scale(0.97); }
    .btn-primary { background: var(--teal); color: var(--navy); padding: 0.45rem 1rem; font-size: 0.85rem; }
    .btn-ghost { background: var(--navy3); color: var(--off-white); padding: 0.45rem 0.9rem; font-size: 0.82rem; border: 1px solid var(--divider); }
    .btn-sm { padding: 0.3rem 0.75rem; font-size: 0.78rem; border-radius: 6px; }

    .breadcrumb { max-width: 760px; margin: 0 auto; width: 100%; padding: 1rem 2rem 0; font-size: 0.78rem; color: var(--dimmer); }
    .breadcrumb a { color: var(--dimmer); text-decoration: none; }
    .breadcrumb a:hover { color: var(--muted); }
    .breadcrumb span[aria-current] { color: var(--muted); }

    .hero { text-align: center; padding: 2rem 1.5rem 1.75rem; }
    .hero-eyebrow { font-family: var(--mono); font-size: 0.72rem; color: var(--teal); letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 0.9rem; }
    .hero h1 { font-size: clamp(1.6rem, 4vw, 2.6rem); font-weight: 700; letter-spacing: -0.035em; line-height: 1.15; margin-bottom: 0.75rem; }
    .hero h1 em { font-style: normal; color: var(--teal); }
    .hero p { color: var(--muted); font-size: 0.97rem; max-width: 560px; margin: 0 auto; line-height: 1.6; }

    main { max-width: 760px; margin: 0 auto; width: 100%; padding: 0 2rem; flex: 1; }

    /* SCALER CARD */
    .calc-card { background: var(--navy2); border: 1px solid var(--divider); border-radius: var(--radius); padding: 1.5rem; margin: 1.5rem 0 2rem; }
    .calc-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 1rem; }
    .calc-row { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: flex-end; margin-bottom: 1rem; }
    .calc-field { display: flex; flex-direction: column; gap: 0.35rem; flex: 1; min-width: 120px; }
    .calc-field label { font-size: 0.72rem; color: var(--dimmer); font-weight: 500; }
    .calc-field input { background: var(--navy3); border: 1px solid var(--divider); border-radius: 7px; color: var(--off-white); font-family: var(--sans); font-size: 0.88rem; padding: 0.55rem 0.7rem; }
    .calc-field input:focus { outline: 2px solid var(--teal); outline-offset: -1px; }
    .calc-result { flex: 1; min-width: 140px; background: var(--teal-dim); border: 1px solid rgba(0,201,167,0.3); border-radius: 7px; padding: 0.55rem 0.7rem; display: flex; flex-direction: column; gap: 0.15rem; }
    .calc-result span { font-size: 0.7rem; color: var(--muted); }
    .calc-result strong { font-family: var(--mono); font-size: 1.15rem; color: var(--teal); }

    .scaler-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
    .scaler-col label { font-size: 0.72rem; color: var(--dimmer); font-weight: 500; display: block; margin-bottom: 0.35rem; }
    .scaler-col textarea {
      width: 100%; min-height: 160px; background: var(--navy3); border: 1px solid var(--divider);
      border-radius: 7px; color: var(--off-white); font-family: var(--mono); font-size: 0.82rem;
      padding: 0.7rem; resize: vertical; line-height: 1.6;
    }
    .scaler-col textarea:focus { outline: 2px solid var(--teal); outline-offset: -1px; }
    .scaler-col textarea[readonly] { color: var(--teal); }
    .calc-note { font-size: 0.76rem; color: var(--dimmer); margin-top: 0.9rem; line-height: 1.5; }

    @media (max-width: 640px) { .scaler-grid { grid-template-columns: 1fr; } }

    /* CHART */
    .chart-section { margin-bottom: 2.5rem; }
    .chart-section h2 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 1rem; }
    .chart-scroll { overflow-x: auto; border: 1px solid var(--divider); border-radius: var(--radius); }
    table.chart-table { width: 100%; border-collapse: collapse; font-size: 0.84rem; min-width: 480px; }
    table.chart-table th, table.chart-table td { padding: 0.65rem 0.9rem; text-align: right; border-bottom: 1px solid var(--divider); white-space: nowrap; }
    table.chart-table th:first-child, table.chart-table td:first-child { text-align: left; }
    table.chart-table thead th { background: var(--navy3); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--dimmer); font-weight: 600; }
    table.chart-table tbody tr:last-child td { border-bottom: none; }
    table.chart-table tbody td:not(:first-child) { font-family: var(--mono); color: var(--teal); }
    table.chart-table tbody td:first-child { color: var(--off-white); font-weight: 500; }

    .seo-block { margin-bottom: 1.75rem; }
    .seo-block h2 { font-size: 1rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.6rem; }
    .seo-block p { font-size: 0.875rem; color: var(--muted); line-height: 1.7; }
    .seo-block p + p { margin-top: 0.6rem; }

    .cta-box { background: var(--navy2); border: 1px solid var(--divider); border-radius: var(--radius); padding: 1.5rem; margin: 2rem 0 2.5rem; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; }
    .cta-box p { font-size: 0.88rem; color: var(--muted); max-width: 420px; }
    .cta-box strong { color: var(--off-white); }

    .related-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0 0 2.5rem; }
    .related-links a {
      font-size: 0.8rem; color: var(--muted); text-decoration: none;
      border: 1px solid var(--divider); border-radius: 20px; padding: 0.4rem 0.9rem;
      transition: color 0.15s, border-color 0.15s;
    }
    .related-links a:hover { color: var(--teal); border-color: var(--teal); }

    .faq-section { border-top: 1px solid var(--divider); padding: 2.5rem 0 3rem; }
    .faq-eyebrow { font-family: var(--mono); font-size: 0.7rem; color: var(--teal); letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 0.75rem; font-weight: 500; }
    .faq-heading { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.025em; margin-bottom: 1.5rem; }
    .faq-list { display: flex; flex-direction: column; }
    .faq-item { border-top: 1px solid var(--divider); }
    .faq-item:last-child { border-bottom: 1px solid var(--divider); }
    .faq-question { width: 100%; background: none; border: none; text-align: left; padding: 1.1rem 0; font-family: var(--sans); font-size: 0.95rem; font-weight: 600; color: var(--off-white); cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 1rem; transition: color 0.15s; }
    .faq-question:hover { color: var(--teal); }
    .faq-chevron { font-size: 0.7rem; color: var(--dimmer); flex-shrink: 0; transition: transform 0.2s ease, color 0.15s; }
    .faq-item.open .faq-chevron { transform: rotate(180deg); color: var(--teal); }
    .faq-answer { font-size: 0.875rem; color: var(--muted); line-height: 1.65; max-height: 0; overflow: hidden; transition: max-height 0.25s ease, padding 0.2s ease; padding: 0; }
    .faq-item.open .faq-answer { max-height: 300px; padding-bottom: 1.1rem; }

    .modal-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(5,12,22,0.85);
      backdrop-filter: blur(6px);
      z-index: 300;
      display: none;
      align-items: center;
      justify-content: center;
      padding: 1rem;
    }

    .modal-backdrop.open { display: flex; }

    .modal {
      background: var(--navy2);
      border: 1px solid rgba(0,201,167,0.2);
      border-radius: 16px;
      width: 100%;
      max-width: 480px;
      max-height: 88vh;
      display: flex;
      flex-direction: column;
      box-shadow: 0 24px 64px rgba(0,0,0,0.6);
    }

    .modal-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.1rem 1.35rem;
      border-bottom: 1px solid var(--divider);
    }

    .modal-title {
      font-size: 1rem;
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    .modal-close {
      background: var(--navy3);
      border: 1px solid var(--divider);
      color: var(--muted);
      border-radius: 7px;
      width: 30px; height: 30px;
      font-size: 1rem;
      cursor: pointer;
      display: grid;
      place-items: center;
      transition: color 0.15s;
    }

    .modal-close:hover { color: var(--off-white); }

    .modal-body {
      flex: 1;
      overflow-y: auto;
      padding: 1.1rem 1.35rem;
    }

    .modal-footer {
      padding: 1rem 1.35rem;
      border-top: 1px solid var(--divider);
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    footer {
      border-top: 1px solid var(--divider);
      padding: 1rem 2rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 0.5rem;
    }

    .footer-note { font-size: 0.74rem; color: var(--dimmer); }

    .footer-links { display: flex; gap: 1.25rem; flex-wrap: wrap; }

    .footer-links a {
      font-size: 0.74rem;
      color: var(--dimmer);
      text-decoration: none;
      transition: color 0.15s;
    }

    .footer-links a:hover { color: var(--muted); }

    .footer-link-btn {
      background: none;
      border: none;
      font-family: var(--sans);
      font-size: 0.74rem;
      color: var(--dimmer);
      cursor: pointer;
      padding: 0;
      transition: color 0.15s;
    }

    .footer-link-btn:hover { color: var(--muted); }

    @media (max-width: 720px) {
      header { padding: 0.8rem 1rem; }
      .breadcrumb { padding: 1rem 1rem 0; }
      main { padding: 0 1rem; }
      .hero { padding: 1.5rem 1rem 1.25rem; }
      .hero h1 { font-size: 1.5rem; }
      footer { padding: 0.85rem 1rem; }
      .cta-box { flex-direction: column; align-items: flex-start; }
    }