/* Omni-style tool page. Look only — no copy/math changes. */

:root {
  --bg: #fafafa;
  --card: #ffffff;
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #0f766e;
  --accent-soft: #ccfbf1;
  --warn-bg: #fff7ed;
  --warn-ink: #9a3412;
  --warn-line: #fdba74;
  --err-bg: #fef2f2;
  --err-ink: #991b1b;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(17, 24, 39, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

.wrap {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
}

header.hero {
  padding: 1.75rem 0 0.35rem;
}

header.hero h1 {
  margin: 0 0 0.5rem;
  font-family: inherit;
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.lede {
  margin: 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 0.98rem;
}

.lede + .lede {
  margin-top: 0.55rem;
}

main.layout {
  display: grid;
  gap: 1rem;
  padding: 1rem 0 2.25rem;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.15rem 1.2rem;
}

.panel h2 {
  margin: 0 0 0.85rem;
  font-size: 0.92rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.panel h3 {
  margin: 1.15rem 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 650;
  line-height: 1.35;
}

.panel p {
  margin: 0 0 0.85rem;
}

.field-grid {
  display: grid;
  gap: 0.75rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  font-weight: 600;
  font-size: 0.86rem;
}

.help {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.78rem;
}

input,
select {
  width: 100%;
  min-height: 2.45rem;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

input:focus,
select:focus,
.radio input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

fieldset.spacing-set {
  margin: 0;
  padding: 0.65rem 0.75rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
}

fieldset.spacing-set legend {
  font-weight: 650;
  padding: 0 0.3rem;
}

.radio-row {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 0.4rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: #fff;
}

label.radio {
  flex-direction: row;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0.42rem 0.95rem;
  font-weight: 600;
  font-size: 0.84rem;
  cursor: pointer;
  border-right: 1px solid var(--line);
}

label.radio:last-child {
  border-right: 0;
}

label.radio:has(input:checked) {
  background: var(--accent);
  color: #fff;
}

label.radio input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

[hidden] {
  display: none !important;
}

.results {
  background: var(--card);
  color: var(--ink);
  border-color: var(--line);
}

.results h2 {
  color: var(--ink);
}

.results .hint,
.results .cost-note {
  color: var(--muted);
}

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin: 0;
}

.stats > div {
  background: #f9fafb;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.7rem 0.8rem 0.75rem;
}

.stats dt {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
}

.stats dd {
  margin: 0.2rem 0 0;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}

.cost-note {
  margin: 0.85rem 0 0;
  font-size: 0.86rem;
}

.errors,
.warnings {
  list-style: none;
  margin: 0 0 0.9rem;
  padding: 0.75rem 0.9rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
}

.errors {
  background: var(--err-bg);
  color: var(--err-ink);
  border: 1px solid #fecaca;
}

.warnings {
  background: var(--warn-bg);
  color: var(--warn-ink);
  border: 1px solid var(--warn-line);
}

.hint {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.formula-list,
.shop-list,
.shop-links,
.example-list {
  margin: 0 0 0.85rem;
  padding-left: 1.15rem;
}

.formula-list li,
.shop-list li,
.shop-links li,
.example-list li {
  margin: 0.4rem 0;
}

.shop-links-label {
  margin: 1rem 0 0.35rem;
  font-weight: 650;
}

.formula-block {
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 0 0.85rem;
  padding: 0.85rem 1rem;
  background: #f3f4f6;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.5;
  white-space: pre;
  max-width: 100%;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 0 0.85rem;
  max-width: 100%;
}

.bands {
  width: 100%;
  min-width: 18rem;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.bands.compare {
  min-width: 40rem;
}

.bands caption {
  text-align: left;
  font-weight: 650;
  margin-bottom: 0.4rem;
}

.bands th,
.bands td {
  border-bottom: 1px solid var(--line);
  padding: 0.5rem 0.6rem 0.5rem 0;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}

.bands.compare td,
.bands.compare th {
  white-space: normal;
}

.diagram-wrap {
  margin: 0.85rem 0 1.1rem;
  padding: 0.65rem;
  max-width: 36rem;
  background: #f3f4f6;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.diagram-wrap svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.faq h3 {
  margin-top: 1.35rem;
  font-size: 1.02rem;
}

.faq h3:first-of-type {
  margin-top: 0.35rem;
}

.faq p {
  margin: 0 0 0.85rem;
}

.disclaimer {
  margin: 0 auto 2.5rem;
  padding: 0.95rem 1.1rem;
  border-left: 3px solid var(--accent);
  background: #fff;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 0.9rem;
}

.disclaimer p {
  margin: 0;
}

@media (min-width: 840px) {
  main.layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .results {
    position: sticky;
    top: 1rem;
  }

  .field-grid {
    grid-template-columns: 1fr 1fr;
  }

  .field-grid .span-2,
  .span-bottom {
    grid-column: 1 / -1;
  }

  .formula-block {
    font-size: 0.86rem;
  }
}

@media (max-width: 480px) {
  .wrap {
    width: min(1080px, calc(100% - 1.25rem));
  }

  .panel {
    padding: 0.95rem 0.85rem 1.05rem;
  }

  .stats {
    grid-template-columns: 1fr;
  }

  .stats dd {
    font-size: 1.45rem;
  }

  .formula-block {
    font-size: 0.78rem;
    padding: 0.7rem 0.75rem;
  }
}