/* Watt Math — plain, document-like, data forward. Not a startup landing page. */

:root {
  --ink: #14161a;
  --ink-2: #444a54;
  --ink-3: #6b7280;
  --line: #e3e6ea;
  --line-2: #c9ced6;
  --bg: #ffffff;
  --bg-2: #f7f8fa;
  --bad: #b42318;
  --bad-bg: #fef3f2;
  --good: #067647;
  --good-bg: #ecfdf3;
  --accent: #1b4dd8;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
.wrap-wide { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */
header {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
header .wrap-wide { display: flex; align-items: center; gap: 24px; }
.brand {
  font-weight: 700; font-size: 17px; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.brand span { color: var(--accent); }
nav.top { display: flex; gap: 18px; flex-wrap: wrap; font-size: 15px; }
nav.top a { color: var(--ink-2); text-decoration: none; }
nav.top a:hover { color: var(--accent); text-decoration: underline; }

/* ---------- disclosure: must be visible without scrolling ---------- */
.disclosure {
  background: var(--bg-2);
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--ink-2);
  padding: 9px 0;
}
.disclosure a { color: var(--ink-2); }

/* ---------- type ---------- */
h1 {
  font-size: 40px; line-height: 1.12; letter-spacing: -0.025em;
  margin: 34px 0 14px; font-weight: 700;
}
h2 {
  font-size: 25px; line-height: 1.25; letter-spacing: -0.015em;
  margin: 44px 0 12px; font-weight: 700;
}
h3 { font-size: 18px; margin: 28px 0 8px; font-weight: 650; }
p { margin: 0 0 16px; }
.lede { font-size: 20px; color: var(--ink-2); line-height: 1.5; }
a { color: var(--accent); }
small, .small { font-size: 14px; color: var(--ink-3); line-height: 1.5; }

/* ---------- the headline number ---------- */
.verdict {
  border: 1px solid var(--line-2);
  border-left: 4px solid var(--bad);
  background: var(--bad-bg);
  border-radius: 6px;
  padding: 22px 24px;
  margin: 26px 0;
}
.verdict .n {
  font-size: 46px; font-weight: 700; letter-spacing: -0.03em;
  line-height: 1.05; color: var(--bad); font-variant-numeric: tabular-nums;
}
.verdict .cap { font-size: 15px; color: var(--ink-2); margin-top: 6px; }

/* ---------- comparison bars ---------- */
.bars { margin: 22px 0; }
.bar-row { display: grid; grid-template-columns: 190px 1fr 78px; gap: 12px;
           align-items: center; margin-bottom: 9px; font-size: 15px; }
.bar-row .lbl { color: var(--ink-2); }
.bar-track { background: var(--bg-2); border-radius: 3px; height: 26px; position: relative; }
.bar-fill { height: 100%; border-radius: 3px; background: var(--line-2); }
.bar-fill.hi { background: var(--bad); }
.bar-fill.lo { background: var(--good); }
.bar-row .val { text-align: right; font-family: var(--mono); font-size: 14.5px;
                font-variant-numeric: tabular-nums; }
@media (max-width: 620px) {
  .bar-row { grid-template-columns: 1fr 64px; }
  .bar-row .bar-track { grid-column: 1 / -1; }
}

/* ---------- tables ---------- */
.tablewrap { overflow-x: auto; margin: 20px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); }
th { font-weight: 650; color: var(--ink-2); font-size: 13.5px;
     text-transform: uppercase; letter-spacing: 0.04em; white-space: nowrap; }
td.num, th.num { text-align: right; font-family: var(--mono);
                 font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.flag td { background: var(--bad-bg); }
tr.best td { background: var(--good-bg); }

/* ---------- quote from a source document ---------- */
.src {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px 18px;
  margin: 20px 0;
  background: var(--bg-2);
}
.src .q { font-size: 16.5px; line-height: 1.55; margin: 0 0 9px; }
.src .who { font-size: 13.5px; color: var(--ink-3); }

/* ---------- callout ---------- */
.note {
  border-left: 3px solid var(--line-2);
  padding: 2px 0 2px 16px;
  margin: 20px 0;
  color: var(--ink-2);
  font-size: 16px;
}

/* ---------- cta ---------- */
.cta {
  display: inline-block; background: var(--accent); color: #fff;
  padding: 11px 20px; border-radius: 6px; text-decoration: none;
  font-weight: 600; font-size: 16px; margin: 6px 0;
}
.cta:hover { background: #163fae; }

/* ---------- zip form ---------- */
.zipform { display: flex; gap: 8px; margin: 20px 0; flex-wrap: wrap; }
.zipform input {
  font-size: 17px; padding: 11px 14px; border: 1px solid var(--line-2);
  border-radius: 6px; width: 150px; font-family: var(--sans);
}
.zipform button {
  font-size: 16px; font-weight: 600; padding: 11px 20px; border: 0;
  border-radius: 6px; background: var(--ink); color: #fff; cursor: pointer;
}
#zipmsg { font-size: 15px; color: var(--ink-2); min-height: 22px; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line); margin-top: 60px;
  padding: 26px 0 50px; font-size: 14px; color: var(--ink-3);
}
footer a { color: var(--ink-3); }
footer nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 12px; }
.stamp { font-family: var(--mono); font-size: 13px; color: var(--ink-3); }

/* ---------- utility picker ---------- */
.picker { display: grid; grid-template-columns: repeat(auto-fit, minmax(196px, 1fr));
          gap: 10px; margin: 20px 0; }
.pick {
  display: flex; flex-direction: column; gap: 3px;
  border: 1px solid var(--line-2); border-radius: 8px;
  padding: 14px 16px; text-decoration: none; color: var(--ink);
  background: var(--bg); transition: border-color .12s, background .12s;
}
.pick:hover { border-color: var(--accent); background: var(--bg-2); }
.pick strong { font-size: 16px; font-weight: 650; line-height: 1.25; }
.pick span { font-size: 13.5px; color: var(--ink-3); }