:root {
      --bg: #04001F;
      --surface: #140E24;
      --surface-2: #1E1236;
      --surface-3: #2D184E;
      --accent: #5C2D91;
      --accent-light: #9F6FD8;
      --text: #ECECEC;
      --text-muted: #B1AFAD;
      --border: #4F485E;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      min-height: 100vh;
    }
    a { color: var(--accent-light); text-decoration: none; }
    a:hover { text-decoration: underline; }

    /* Base content typography, shared by every page. The six tool description
       pages are built from plain p/ul/ol/li/blockquote/h1 and need these to
       read at all. Everywhere else these elements already have a more
       specific rule (header h1, .page-404, .tools-intro, .lead, .field-note,
       .disclaimer/.unresolved/.rounding-note, .byline) that wins on
       specificity, so it keeps its current look unchanged. */
    p { margin-bottom: 1rem; }
    h1 { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; }
    ul, ol { padding-left: 1.25rem; margin-bottom: 1rem; }
    li { margin-bottom: 0.5rem; }
    li:last-child { margin-bottom: 0; }
    blockquote {
      background: var(--surface);
      border-left: 3px solid var(--accent);
      border-radius: 0 4px 4px 0;
      padding: 0.75rem 1rem;
      margin: 1.5rem 0;
      color: var(--text-muted);
    }
    blockquote p { margin-bottom: 0.75rem; }
    blockquote p:last-child { margin-bottom: 0; }
    .byline { color: var(--text-muted); font-size: 0.8rem; margin-top: 2rem; }

    /* Reference table pages (rates/*): plain semantic tables, no calculator. */
    .container > table { width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: 0.95rem; }
    .container > table th,
    .container > table td { text-align: left; padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); }
    .container > table th { color: var(--text-muted); font-weight: 600; border-bottom: 2px solid var(--border); }
    .container dl { margin: 1rem 0; }
    .container dt { font-weight: 600; margin-top: 1rem; }
    .container dd { margin: 0.25rem 0 0; }

    .container { max-width: 860px; margin: 0 auto; padding: 2rem 1.5rem; }

    header { text-align: center; padding: 3rem 0 2rem; }
    header h1 { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; }
    header p.subtitle { color: var(--text-muted); font-size: 1.05rem; max-width: 640px; margin: 0 auto 1rem; }
    .badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; margin-top: 1rem; }
    .badge {
      display: inline-block; padding: 0.3rem 0.75rem; border-radius: 4px;
      font-size: 0.8rem; font-weight: 600;
      background: var(--surface); border: 1px solid var(--border); color: var(--text-muted);
    }

    .install-section {
      background: var(--surface);
      border: 1px solid var(--accent);
      border-radius: 8px;
      padding: 1.5rem;
      margin: 2rem 0;
    }
    .install-section h2 { font-size: 1.2rem; margin-bottom: 0.75rem; }
    pre {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 1rem;
      overflow-x: auto;
      font-size: 0.85rem;
      line-height: 1.5;
    }
    code { font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace; }
    .comment { color: var(--text-muted); }
    .cmd { color: var(--accent-light); }

    h2.section-title {
      font-size: 1.1rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border);
      padding-bottom: 0.5rem;
      margin: 2.5rem 0 1rem;
    }

    .tools-intro { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 1rem; }
    .tools-list {
      display: grid;
      grid-template-columns: 1fr;
      gap: 0.75rem;
      margin: 1.5rem 0;
    }
    @media (min-width: 640px) {
      .tools-list { grid-template-columns: 1fr 1fr; }
    }
    .tool-card {
      background: var(--surface);
      border: 1px solid var(--accent);
      border-radius: 6px;
      padding: 0.9rem 1rem;
    }
    .tool-card .tool-name { font-weight: 600; font-size: 0.95rem; }
    .tool-card .desc { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.35rem; }

    .repo-card .tool-link {
      display: inline-block;
      margin-top: 0.4rem;
      font-size: 0.8rem;
      font-weight: 600;
    }

    .stack {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.5rem;
      margin: 1.5rem 0;
    }
    @media (min-width: 640px) {
      .stack { grid-template-columns: 1fr 1fr 1fr; }
    }
    .stack-col h3 {
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--text-muted);
      margin-bottom: 0.75rem;
      padding-bottom: 0.4rem;
      border-bottom: 2px solid var(--accent);
    }
    .stack-col.layer-1 h3 { border-color: var(--border); }
    .stack-col.layer-2 h3 { border-color: var(--accent); }
    .stack-col.layer-3 h3 { border-color: var(--accent-light); }

    .repo-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 0.75rem;
      margin-bottom: 0.5rem;
    }
    .repo-card .name { font-weight: 600; font-size: 0.9rem; }
    .repo-card .alias { color: var(--text-muted); font-size: 0.8rem; font-family: monospace; }
    .repo-card .desc { color: var(--text-muted); font-size: 0.8rem; margin-top: 0.25rem; }

    .principles {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      margin: 1rem 0;
    }
    @media (max-width: 639px) {
      .principles { grid-template-columns: 1fr; }
    }
    .principle {
      background: var(--surface);
      border-left: 3px solid var(--accent);
      padding: 0.75rem 1rem;
      border-radius: 0 4px 4px 0;
    }
    .principle strong { display: block; margin-bottom: 0.25rem; font-size: 0.9rem; }
    .principle span { color: var(--text-muted); font-size: 0.8rem; }

    footer {
      text-align: center;
      padding: 2rem 0;
      color: var(--text-muted);
      font-size: 0.85rem;
      border-top: 1px solid var(--border);
      margin-top: 2rem;
    }
    footer a { color: var(--accent-light); }
    /* Compensates the new base `p { margin-bottom }` above so the two footer
       paragraphs keep their current spacing (governed by the inline
       margin-top on the second one), not a new collapsed margin. */
    footer p { margin-bottom: 0; }

    .links {
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      flex-wrap: wrap;
      margin-top: 1rem;
    }
    .links a {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.5rem 1rem;
      border: 1px solid var(--accent);
      border-radius: 6px;
      font-size: 0.9rem;
      transition: background 0.2s;
    }
    .links a:hover { background: var(--surface); text-decoration: none; }
  
    /* 404.html-only rules, scoped so they cannot affect index.html */
    body.page-404 { display: flex; align-items: center; justify-content: center; }
    .page-404 .container { max-width: 640px; padding: 2rem 1.5rem; text-align: center; margin: 0; }
    .page-404 .code {
      font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace;
      font-size: 0.8rem;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--text-muted);
      margin-bottom: 0.75rem;
    }
    .page-404 h1 { font-size: 1.9rem; font-weight: 700; margin-bottom: 0.75rem; }
    .page-404 p.lead { color: var(--text-muted); margin-bottom: 1.75rem; }
    .page-404 .links { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; margin-top: 0; }
    .page-404 .links a {
      display: inline-block;
      padding: 0.45rem 0.9rem;
      border-radius: 6px;
      font-size: 0.9rem;
      font-weight: 600;
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--accent-light);
      text-decoration: none;
      transition: none;
    }
    .page-404 .links a:first-child { border-color: var(--accent); }
    .page-404 .links a:hover { background: var(--surface); text-decoration: underline; }

    /* tools/coal-lsl-levy/index.html-only rules, scoped so they cannot affect other pages */
    .page-calculator .lead { color: var(--text-muted); margin: 1rem 0 1.5rem; }
    .page-calculator fieldset {
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 1rem;
      margin: 1.5rem 0;
    }
    .page-calculator legend { padding: 0 0.4rem; font-weight: 600; }
    .page-calculator fieldset label { display: block; margin: 0.4rem 0; font-weight: 400; }
    .page-calculator .field { margin: 1rem 0; }
    .page-calculator .field > label { display: block; margin-bottom: 0.3rem; font-weight: 600; font-size: 0.9rem; }
    .page-calculator .field input[type="number"],
    .page-calculator .field input[type="month"],
    .page-calculator .field input[type="text"] {
      width: 100%;
      max-width: 260px;
      padding: 0.4rem 0.5rem;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 4px;
      color: var(--text);
      font-size: 0.95rem;
    }
    .page-calculator .field-note { color: var(--text-muted); font-size: 0.8rem; margin-top: 0.3rem; margin-bottom: 0; }
    .page-calculator .field-checkbox label { display: flex; align-items: center; gap: 0.5rem; font-weight: 400; }
    .page-calculator .bonus-row { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-bottom: 0.5rem; }
    .page-calculator .bonus-row input,
    .page-calculator .bonus-row select {
      padding: 0.4rem 0.5rem;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 4px;
      color: var(--text);
    }
    .page-calculator button {
      padding: 0.5rem 1rem;
      background: var(--accent);
      border: 1px solid var(--accent);
      border-radius: 6px;
      color: var(--text);
      font-size: 0.9rem;
      cursor: pointer;
    }
    .page-calculator button:hover { background: var(--accent-light); border-color: var(--accent-light); }
    .page-calculator button.link-button {
      background: none;
      border: none;
      color: var(--accent-light);
      text-decoration: underline;
      padding: 0.2rem 0.4rem;
    }
    .page-calculator #result {
      background: var(--surface);
      border: 1px solid var(--accent);
      border-radius: 8px;
      padding: 1.25rem;
      margin: 1.5rem 0;
    }
    .page-calculator #result:empty { display: none; }
    .page-calculator .result-row {
      display: flex;
      justify-content: space-between;
      gap: 1rem;
      padding: 0.35rem 0;
      border-bottom: 1px solid var(--border);
    }
    .page-calculator .result-row:last-of-type { border-bottom: none; }
    .page-calculator .result-why { margin-top: 0.75rem; margin-bottom: 0; color: var(--text-muted); font-size: 0.9rem; }
    .page-calculator table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
    .page-calculator table th,
    .page-calculator table td { text-align: left; padding: 0.5rem; border-bottom: 1px solid var(--border); }
    .page-calculator .disclaimer,
    .page-calculator .unresolved,
    .page-calculator .rounding-note {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 1.25rem;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .page-calculator .disclaimer p,
    .page-calculator .unresolved p,
    .page-calculator .rounding-note p { margin-bottom: 0.75rem; }
    .page-calculator .disclaimer p:last-child,
    .page-calculator .unresolved p:last-child,
    .page-calculator .rounding-note p:last-child { margin-bottom: 0; }
    .page-calculator .unresolved ul { padding-left: 1.25rem; margin-bottom: 0; }
    .page-calculator .unresolved li { margin-bottom: 0.5rem; }
    .page-calculator .unresolved li:last-child { margin-bottom: 0; }
    .page-calculator .byline { color: var(--text-muted); font-size: 0.8rem; margin-top: 2rem; }
    .page-calculator tfoot td { font-weight: 700; border-top: 2px solid var(--border); border-bottom: none; }
    /* Answer, questions, sources and provenance blocks. Every page uses them,
       so they sit outside the .page-calculator scope. */
    .short-answer {
      background: var(--surface);
      border-left: 3px solid var(--accent-light);
      border-radius: 0 6px 6px 0;
      padding: 1rem 1.25rem;
      margin: 1.25rem 0 1.5rem;
      font-size: 1.02rem;
    }
    .faq h3 { font-size: 1rem; font-weight: 600; margin: 1.25rem 0 0.35rem; }
    .faq h3:first-child { margin-top: 0; }
    .faq p { color: var(--text-muted); }
    .sources li, .related li { margin-bottom: 0.4rem; }
    .page-meta { color: var(--text-muted); font-size: 0.8rem; margin-top: 2rem; }
    table.facts { width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: 0.92rem; }
    table.facts th,
    table.facts td { text-align: left; vertical-align: top; padding: 0.6rem 0.5rem; border-bottom: 1px solid var(--border); }
    table.facts th { width: 12rem; color: var(--text-muted); font-weight: 600; }
    @media (max-width: 560px) {
      table.facts th { width: 9rem; }
    }