/* GasTest Log — instrument panel: dark field tool, one blue needle, numbers in mono.
   Deliberately unlike the hub and unlike every other section. */
:root {
  --bg: #0b0f14;
  --panel: #121820;
  --panel-2: #0e141b;
  --fg: #e9eef7;
  --muted: #8d9ab0;
  --line: #1f2733;
  --accent: #4a90f0;
  --pass: #34c77b;
  --warn: #f0b33a;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.wrap { max-width: 46rem; margin: 0 auto; padding: 0 20px; }

/* top bar */
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}
.bar a { color: var(--muted); text-decoration: none; }
.bar a:hover { color: var(--fg); }
.bar .id { display: flex; align-items: center; gap: 10px; color: var(--fg); }
.bar .id img { width: 26px; height: 26px; border-radius: 7px; display: block; }

/* hero */
.hero { padding: clamp(36px, 8vw, 64px) 0 clamp(24px, 5vw, 40px); }
h1 {
  font-size: clamp(2rem, 6.4vw, 2.9rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 14px;
  font-weight: 700;
}
.sub { font-size: clamp(1.05rem, 3.2vw, 1.22rem); color: var(--muted); margin: 0 0 24px; max-width: 34rem; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #06101f;
  font-weight: 650;
  text-decoration: none;
  padding: 12px 20px;
  border-radius: 11px;
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--fg); border: 1px solid var(--line); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); filter: none; }

/* gauge + readout */
.instrument {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  margin: 36px 0;
}
.instrument svg { width: 100%; height: auto; display: block; }
.readout dt {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.readout dd {
  margin: 2px 0 14px;
  font-family: var(--mono);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}
.readout dd small { font-size: 0.8rem; color: var(--muted); font-family: inherit; }
.readout dd:last-child { margin-bottom: 0; }
@media (max-width: 40rem) {
  .instrument { grid-template-columns: 1fr; gap: 18px; padding: 18px; }
  .instrument svg { max-width: 190px; margin: 0 auto; }
}

/* sections */
section { padding: clamp(28px, 6vw, 48px) 0; border-top: 1px solid var(--line); }
h2 {
  font-size: clamp(1.3rem, 4vw, 1.6rem);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}
h3 { font-size: 1.02rem; margin: 22px 0 4px; }
p { margin: 0 0 14px; }
.lede { color: var(--muted); max-width: 36rem; }

/* steps */
.steps { display: grid; gap: 14px; margin: 22px 0 0; padding: 0; list-style: none; counter-reset: step; }
.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 15px 17px;
}
.steps li::before {
  content: counter(step);
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.95rem;
  padding-top: 1px;
}
.steps b { display: block; margin-bottom: 2px; }
.steps span { color: var(--muted); font-size: 0.96rem; }

/* facts table */
table { width: 100%; border-collapse: collapse; margin: 18px 0 10px; font-size: 0.97rem; }
th, td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
td.num { font-family: var(--mono); white-space: nowrap; }
td cite { display: block; color: var(--muted); font-style: normal; font-size: 0.85rem; margin-top: 3px; }

/* note / caveat */
.note {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--warn);
  border-radius: 0 12px 12px 0;
  padding: 14px 16px;
  color: var(--muted);
  font-size: 0.95rem;
  margin: 18px 0;
}
.note b { color: var(--fg); }

/* screenshots */
.shots { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 22px; }
.shots img { width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); display: block; }
@media (max-width: 40rem) {
  .shots { grid-template-columns: repeat(2, 1fr); }
}

/* tool cards */
.tools { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 14px; margin-top: 20px; }
.tool {
  display: block;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  text-decoration: none;
  color: inherit;
}
.tool:hover { border-color: var(--accent); }
.tool b { display: block; font-size: 1.04rem; margin-bottom: 4px; }
.tool span { color: var(--muted); font-size: 0.94rem; }

/* calculator */
.calc {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  margin: 24px 0;
}
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 0.9rem; margin-bottom: 6px; }
.field .hint { color: var(--muted); font-size: 0.85rem; margin-top: 5px; }
input[type="number"], select {
  width: 100%;
  background: var(--panel-2);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 12px 13px;
  font: inherit;
  font-family: var(--mono);
}
input[type="number"]:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.result {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  margin-top: 6px;
}
.result .big { font-family: var(--mono); font-size: clamp(1.6rem, 6vw, 2.2rem); letter-spacing: -0.02em; }
.result .big span { color: var(--muted); font-size: 0.9rem; }
.result .pair { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.result cite { display: block; font-style: normal; color: var(--muted); font-size: 0.86rem; margin-top: 12px; }
@media (max-width: 34rem) { .result .pair { grid-template-columns: 1fr; gap: 12px; } }

/* faq */
.faq h3 { margin-top: 20px; }
.faq p { color: var(--muted); }

/* footer */
footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 56px;
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { color: var(--muted); }
footer a:hover { color: var(--fg); }
footer p { margin: 0 0 6px; }

.reviewed { font-size: 0.82rem; opacity: 0.75; margin-top: 10px; }