*, *::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);
      --teal-glow: rgba(0,201,167,0.06);
      --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 */
    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 */
    .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 */
    .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 WRAP */
    main { max-width: 760px; margin: 0 auto; width: 100%; padding: 0 2rem; flex: 1; }

    /* CALCULATOR CARD */
    .calc-card {
      background: var(--navy2);
      border: 1px solid var(--divider);
      border-radius: var(--radius);
      padding: 1.5rem;
      margin: 1.5rem 0 2.5rem;
    }
    .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;
    }
    .calc-field { display: flex; flex-direction: column; gap: 0.35rem; flex: 1; min-width: 140px; }
    .calc-field label { font-size: 0.72rem; color: var(--dimmer); font-weight: 500; }
    .calc-field select, .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 select:focus, .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); }
    .calc-note { font-size: 0.76rem; color: var(--dimmer); margin-top: 0.9rem; line-height: 1.5; }

    /* CHART TABLE */
    .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: 560px; }
    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 BLOCKS */
    .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 */
    .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); }

    .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;
    }

    /* FAQ */
    .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; }

    /* FOOTER */
    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; }
    }