:root {
  color-scheme: light dark;
  --bg: #fbfbfa;
  --panel: #ffffff;
  --ink: #16181d;
  --dim: #6a7080;
  --line: #e3e5ea;
  --accent: #2f6df6;
  --warn: #b4560a;
  --warn-bg: #fdf3e7;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1014;
    --panel: #161a21;
    --ink: #e6e8ee;
    --dim: #8b93a5;
    --line: #262c37;
    --accent: #6b9bff;
    --warn: #f0a860;
    --warn-bg: #2a2015;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 0 4rem;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

header {
  padding-top: 4rem;
  padding-bottom: 1rem;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 7vw, 3rem);
  letter-spacing: -0.03em;
  font-weight: 650;
}

h1 .dim {
  color: var(--dim);
}

.lede {
  margin: 0.75rem 0 1.25rem;
  font-size: 1.1rem;
  color: var(--dim);
  max-width: 34rem;
}

.lede strong {
  color: var(--ink);
}

.links {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9rem;
}

.links a {
  color: var(--accent);
  text-decoration: none;
}

.links a:hover {
  text-decoration: underline;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 1.25rem;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.note {
  color: var(--dim);
  font-size: 0.9rem;
  margin: 0.5rem 0 1rem;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
}

pre {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  margin: 0 0 0.85rem;
}

pre code {
  font-size: 0.82rem;
  line-height: 1.55;
}

/* --- comparison table --- */
.compare {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.compare th,
.compare td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--line);
}

.compare thead th {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--dim);
}

.compare tbody th {
  font-weight: 400;
  color: var(--dim);
  width: 30%;
}

/* --- inputs --- */
.field {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 0.85rem;
  background: var(--bg);
}

.field:focus-within {
  border-color: var(--accent);
}

.field label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--dim);
  flex-shrink: 0;
}

.field input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.95rem;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.presets button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--dim);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
}

.presets button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.presets button:disabled {
  opacity: 0.5;
  cursor: default;
}

/* --- readout --- */
.readout {
  margin: 1.1rem 0 0;
  display: grid;
  grid-template-columns: minmax(7rem, auto) 1fr;
  gap: 0.05rem 1rem;
}

.readout:empty {
  margin: 0;
}

.readout dt {
  color: var(--dim);
  font-size: 0.82rem;
  padding: 0.4rem 0;
  border-top: 1px solid var(--line);
}

.readout dd {
  margin: 0;
  padding: 0.4rem 0;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.85rem;
  word-break: break-all;
}

.readout dd .unit {
  color: var(--dim);
  font-size: 0.78rem;
  margin-left: 0.35rem;
}

.readout .lost {
  color: var(--warn);
}

.banner {
  grid-column: 1 / -1;
  margin-top: 0.9rem;
  padding: 0.7rem 0.85rem;
  border-radius: 8px;
  background: var(--warn-bg);
  color: var(--warn);
  font-size: 0.85rem;
  line-height: 1.5;
}

.error {
  margin-top: 0.9rem;
  color: var(--warn);
  font-size: 0.87rem;
}

.status {
  margin-top: 0.9rem;
  color: var(--dim);
  font-size: 0.87rem;
}

footer {
  margin-top: 2.5rem;
  color: var(--dim);
  font-size: 0.84rem;
}

footer p {
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}