/* ------------------------------------------------------------------ tokens */
  :root {
    --bg: #F3F5F8;
    --surface: #FFFFFF;
    --surface-2: #E9EDF3;
    --ink: #111C2A;
    --muted: #556173;
    --line: #D5DBE4;
    --brand: #1B5FA8;
    --brand-ink: #FFFFFF;
    --warn-row: #FFF1BF;
    --warn-ink: #7A5200;
    --err-row: #FBE3E1;
    --err-ink: #B3261E;
    --ok-ink: #1C7A3E;
    --panel: #0F1B2B;          /* dark "log" panels stay dark in both themes */
    --panel-ink: #D7E0EC;
    --panel-muted: #8494A9;
    --shadow: 0 1px 2px rgba(17,28,42,.06), 0 12px 32px rgba(17,28,42,.10);
    --display: "Archivo", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
    --body: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
    --mono: "JetBrains Mono", Consolas, "SFMono-Regular", monospace;
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      color-scheme: dark;
      --bg: #0C1520; --surface: #132031; --surface-2: #1A2A3E; --ink: #E6ECF3; --muted: #9AA8BA; --line: #26374D;
      --brand: #5BA3F0; --brand-ink: #081421; --warn-row: #3A3013; --warn-ink: #F5CE62; --err-row: #3D1C1C; --err-ink: #FF8A80; --ok-ink: #6BD69A;
      --panel: #07101A; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 12px 32px rgba(0,0,0,.35);
    }
  }
  :root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0C1520; --surface: #132031; --surface-2: #1A2A3E; --ink: #E6ECF3; --muted: #9AA8BA; --line: #26374D;
    --brand: #5BA3F0; --brand-ink: #081421; --warn-row: #3A3013; --warn-ink: #F5CE62; --err-row: #3D1C1C; --err-ink: #FF8A80; --ok-ink: #6BD69A;
    --panel: #07101A; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 12px 32px rgba(0,0,0,.35);
  }

  /* ------------------------------------------------------------------ base */
  * { box-sizing: border-box; }
  body { background: var(--bg); color: var(--ink); font: 400 17px/1.6 var(--body); padding-inline: 20px; }
  .wrap { max-width: 1160px; margin: 0 auto; }
  h1, h2, h3 { font-family: var(--display); font-stretch: 85%; line-height: 1.08; margin: 0; text-wrap: balance; letter-spacing: -0.01em; }
  h1 { font-size: clamp(2.3rem, 5.4vw, 3.9rem); font-weight: 800; }
  h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); font-weight: 750; }
  h3 { font-size: 1.2rem; font-weight: 700; font-stretch: 90%; letter-spacing: 0; }
  p { margin: 0; }
  a { color: var(--brand); }
  code, .mono { font-family: var(--mono); font-size: .86em; }
  .eyebrow { font: 600 .78rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
  .lede { font-size: 1.2rem; color: var(--muted); max-width: 36em; }
  :focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; border-radius: 4px; }
  section { padding-block: 72px; }

  .btn { display: inline-flex; align-items: center; gap: 8px; font: 600 1rem/1 var(--body); padding: 14px 20px; border-radius: 8px; text-decoration: none; border: 1px solid transparent; cursor: pointer; }
  .btn-primary { background: var(--brand); color: var(--brand-ink); }
  .btn-primary:hover { filter: brightness(1.08); }
  .btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
  .btn-ghost:hover { border-color: var(--brand); }

  /* ------------------------------------------------------------------ nav */
  .nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 18px; flex-wrap: wrap; }
  .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
  .brand svg { flex: none; }
  .brand b { font: 800 1.05rem/1 var(--display); font-stretch: 85%; letter-spacing: .01em; }
  .brand small { display: block; font: 500 .72rem/1.3 var(--mono); color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }
  .nav nav { display: flex; gap: 22px; flex-wrap: wrap; align-items: center; }
  .nav nav a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: .95rem; }
  .nav nav a:hover { color: var(--ink); }
  .nav nav a.btn { color: var(--brand-ink); padding: 10px 16px; }

  /* ------------------------------------------------------------------ hero */
  .hero { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 48px; align-items: center; padding-block: 40px 64px; }
  .hero-copy { display: grid; gap: 22px; }
  .beta-pill { justify-self: start; display: inline-flex; gap: 8px; align-items: center; font: 600 .8rem/1 var(--mono); padding: 7px 12px; border-radius: 999px; background: var(--warn-row); color: var(--warn-ink); }
  .beta-pill i { width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
  .cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
  .fine { font-size: .92rem; color: var(--muted); }

  /* App replica */
  .app { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); overflow: hidden; font-family: "Segoe UI", var(--body); font-size: 12.5px; }
  .app-title { display: flex; justify-content: space-between; align-items: center; padding: 8px 12px; background: var(--surface-2); border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
  .app-title span:last-child { letter-spacing: 6px; }
  .app-body { padding: 12px; display: grid; gap: 10px; }
  .app-cards { display: grid; grid-template-columns: 2.2fr repeat(3, 1fr); gap: 8px; }
  .app-card { border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px; }
  .app-card .k { color: var(--muted); font-size: 11px; }
  .app-card .v { font: 700 18px/1.2 var(--display); font-variant-numeric: tabular-nums; }
  .app-card.health .v { color: var(--err-ink); font-size: 15px; }
  .grid-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; }
  table.grid { border-collapse: collapse; width: 100%; min-width: 520px; }
  .grid th { text-align: left; font-weight: 600; color: var(--muted); padding: 6px 8px; border-bottom: 1px solid var(--line); background: var(--surface); white-space: nowrap; }
  .grid td { padding: 5px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; font-variant-numeric: tabular-nums; }
  .grid tr.err td { background: var(--err-row); }
  .grid tr.warn td { background: var(--warn-row); }
  .grid tr.sel td { outline: 1px solid var(--brand); outline-offset: -1px; }
  .grid td.issue { white-space: normal; min-width: 220px; }
  .fix { font-weight: 600; color: var(--ok-ink); }
  .app-fix { border: 1px solid var(--line); border-radius: 6px; padding: 10px 12px; display: grid; gap: 6px; }
  .app-fix b { font-size: 13px; }
  .app-fix ol { margin: 0; padding-left: 18px; color: var(--ink); }
  .app-fix .k { color: var(--muted); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; font-weight: 600; }
  .demo-note { margin-top: 10px; font-size: .82rem; color: var(--muted); text-align: right; }

  /* ------------------------------------------------------------------ problem */
  .problem { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: start; }
  .problem-copy { display: grid; gap: 18px; }
  .problem-copy p { max-width: 34em; }
  .transform { display: grid; gap: 14px; }
  .log { background: var(--panel); color: var(--panel-ink); border-radius: 10px; padding: 16px; font: 400 12.5px/1.65 var(--mono); overflow-x: auto; white-space: pre; }
  .log .t { color: var(--panel-muted); }
  .log .e { color: #FF8C82; }
  .log .w { color: #F5CE62; }
  .log-label { font: 600 .75rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
  .arrow { justify-self: center; color: var(--muted); font: 600 .85rem/1 var(--mono); }
  .result { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--err-ink); border-radius: 8px; padding: 16px 18px; display: grid; gap: 8px; }
  .result h3 { font-size: 1.05rem; }
  .result ol { margin: 0; padding-left: 20px; font-size: .95rem; }

  /* ------------------------------------------------------------------ features */
  .section-head { display: grid; gap: 12px; margin-bottom: 36px; max-width: 46em; }
  .features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
  .feature { background: var(--surface); padding: 26px 24px; display: grid; gap: 10px; align-content: start; }
  .feature .tag { font: 600 .74rem/1 var(--mono); color: var(--brand); letter-spacing: .06em; }
  .feature p { color: var(--muted); font-size: .98rem; }

  /* ------------------------------------------------------------------ sources */
  .sources { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 6fr); gap: 48px; align-items: start; }
  .paths { display: grid; gap: 10px; }
  .path { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 14px; align-items: baseline; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
  .path .src { font: 700 .82rem/1.2 var(--display); font-stretch: 90%; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
  .path code { font-size: .84rem; overflow-wrap: anywhere; }
  .path small { display: block; color: var(--muted); font-size: .88rem; margin-top: 4px; }

  /* ------------------------------------------------------------------ decoder */
  .decoder { background: var(--panel); color: var(--panel-ink); border-radius: 12px; padding: 32px; display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 36px; align-items: start; }
  .decoder h2 { color: #FFFFFF; }
  .decoder p { color: var(--panel-muted); }
  .decoder-copy { display: grid; gap: 14px; }
  .decoder-ui { display: grid; gap: 12px; }
  .decoder label { font: 600 .75rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--panel-muted); }
  .decoder-input { display: flex; gap: 8px; flex-wrap: wrap; }
  .decoder input { flex: 1 1 220px; min-width: 0; font: 400 1.05rem/1 var(--mono); padding: 13px 14px; border-radius: 8px; border: 1px solid #2B3D55; background: #0A1522; color: #FFFFFF; }
  .decoder input::placeholder { color: #5E718A; }
  .chips { display: flex; gap: 8px; flex-wrap: wrap; }
  .chip { font: 400 .8rem/1 var(--mono); padding: 7px 10px; border-radius: 6px; border: 1px solid #2B3D55; background: transparent; color: var(--panel-ink); cursor: pointer; }
  .chip:hover { border-color: #5BA3F0; }
  .decoded { border: 1px solid #2B3D55; border-radius: 8px; padding: 14px 16px; min-height: 92px; display: grid; gap: 6px; }
  .decoded .code { font: 600 .95rem/1.2 var(--mono); color: #F5CE62; }
  .decoded .meaning { color: #FFFFFF; }
  .decoded .next { color: var(--panel-muted); font-size: .95rem; }

  /* ------------------------------------------------------------------ fit */
  .fit { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
  .fit-item { display: grid; gap: 8px; align-content: start; padding-top: 16px; border-top: 2px solid var(--ink); }
  .fit-item p { color: var(--muted); font-size: .96rem; }

  /* ------------------------------------------------------------------ beta */
  .beta { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 40px; display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: 40px; align-items: start; }
  .beta-copy { display: grid; gap: 16px; }
  .beta ul { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
  .contact { display: grid; gap: 14px; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 22px; }
  .contact .addr { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
  .contact .addr code { font-size: 1rem; padding: 10px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; user-select: all; overflow-wrap: anywhere; }
  .copy-status { font-size: .88rem; color: var(--ok-ink); min-height: 1.2em; }
  .contact ol { margin: 0; padding-left: 20px; color: var(--muted); font-size: .95rem; display: grid; gap: 4px; }

  .form { display: grid; gap: 12px; }
  .form .row { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 12px; }
  .form label { display: grid; gap: 5px; font-size: .88rem; font-weight: 600; color: var(--ink); }
  .form input, .form select, .form textarea { font: 400 1rem/1.3 var(--body); padding: 10px 12px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); width: 100%; }
  .form textarea { min-height: 76px; resize: vertical; }
  .form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
  .form-msg { font-size: .95rem; min-height: 1.2em; }
  .form-msg.ok { color: var(--ok-ink); font-weight: 600; }
  .form-msg.bad { color: var(--err-ink); }
  @media (max-width: 600px) { .form .row { grid-template-columns: minmax(0,1fr); } }

  /* ------------------------------------------------------------------ footer */
  footer { padding-block: 40px 56px; border-top: 1px solid var(--line); margin-top: 24px; display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; color: var(--muted); font-size: .9rem; }
  footer p { max-width: 42em; }

  /* ------------------------------------------------------------------ responsive */
  @media (max-width: 960px) {
    .hero, .problem, .sources, .decoder, .beta { grid-template-columns: minmax(0, 1fr); }
    .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .fit { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }
  @media (max-width: 600px) {
    body { padding-inline: 16px; font-size: 16px; }
    section { padding-block: 52px; }
    .features, .fit { grid-template-columns: minmax(0, 1fr); }
    .app-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .app-card.health { grid-column: 1 / -1; }
    .decoder, .beta { padding: 22px; }
    .path { grid-template-columns: minmax(0, 1fr); gap: 4px; }
    .nav nav a:not(.btn) { display: none; }
  }
  @media (prefers-reduced-motion: no-preference) {
    .grid tr.pulse td { animation: pulse 1.6s ease-out 1; }
    @keyframes pulse { from { box-shadow: inset 4px 0 0 var(--err-ink); } to { box-shadow: inset 0 0 0 transparent; } }
  }

/* ---- shared by the sub-pages ---- */
.doc { max-width: 46em; display: grid; gap: 14px; padding-block: 32px 64px; }
.doc h2 { font-size: 1.4rem; margin-top: 14px; }
.doc ul, .doc ol { margin: 0; padding-left: 22px; display: grid; gap: 6px; }
.doc table { border-collapse: collapse; width: 100%; font-size: .95rem; }
.doc th, .doc td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th { color: var(--muted); font-weight: 600; }
.page-head { display: grid; gap: 14px; padding-block: 28px 8px; max-width: 46em; }
.callout { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--brand); border-radius: 8px; padding: 14px 18px; }
.plans { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; align-items: stretch; }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 24px 22px; display: grid; gap: 12px; align-content: start; }
.plan.hot { border: 2px solid var(--brand); box-shadow: var(--shadow); }
.plan .tier { font: 600 .78rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.plan .price { font: 800 2.3rem/1 var(--display); font-stretch: 85%; }
.plan .price small { font: 400 .9rem/1.3 var(--body); color: var(--muted); display: block; margin-top: 6px; }
.plan ul { margin: 0; padding-left: 18px; display: grid; gap: 6px; color: var(--muted); font-size: .95rem; }
.plan .btn { justify-content: center; }
.compare { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; font-size: .96rem; }
.compare th, .compare td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.compare thead th { background: var(--surface-2); font-weight: 600; }
.compare td.c, .compare th.c { text-align: center; width: 110px; }
.compare .yes { color: var(--ok-ink); font-weight: 700; }
.compare .no { color: var(--muted); }
.compare tr.group td { background: var(--bg); font: 600 .74rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.calc { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 22px; display: grid; gap: 12px; max-width: 34em; }
.calc input { font: 400 1.1rem/1 var(--body); padding: 10px 12px; width: 8em; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); }
.calc .total { font: 800 1.8rem/1.1 var(--display); font-stretch: 85%; }
.faq { display: grid; gap: 10px; max-width: 46em; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin-top: 8px; color: var(--muted); }
.steps { counter-reset: s; display: grid; gap: 12px; padding: 0; list-style: none; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 34px minmax(0,1fr); gap: 12px; align-items: start; }
.steps li::before { content: counter(s); width: 34px; height: 34px; border-radius: 50%; background: var(--brand); color: var(--brand-ink); display: grid; place-items: center; font: 700 .95rem/1 var(--display); }
.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.pro-tag { font: 600 .68rem/1 var(--mono); letter-spacing: .08em; color: var(--brand); border: 1px solid var(--brand); border-radius: 4px; padding: 2px 5px; margin-left: 6px; vertical-align: middle; }
@media (max-width: 960px) { .plans { grid-template-columns: repeat(2, minmax(0, 1fr)); } .two { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 600px) { .plans { grid-template-columns: minmax(0, 1fr); } .compare td.c, .compare th.c { width: 70px; padding-inline: 6px; } }