:root {
  --ink: #0F2226;
  --ink-soft: #16302F;
  --panel: #163336;
  --teal: #1F6F78;
  --teal-deep: #124048;
  --aqua: #6FCFC0;
  --aqua-soft: #A9E4D8;
  --brass: #C6A15B;
  --brass-soft: #E4CE9C;
  --paper: #F4EFE3;
  --paper-dim: #E7DFCC;
  --coral: #E2572B;
  --ink-text: #142523;

  --font-display: "Fraunces", "Iowan Old Style", serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", monospace;

  --radius: 6px;
  --border: 1px solid rgba(198, 161, 91, 0.35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

/* ---------- header ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass-soft);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--brass);
  display: inline-block;
}

h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-optical-sizing: auto;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.08;
  margin: 0 0 12px;
  color: var(--paper);
}

h1 em {
  font-style: italic;
  color: var(--aqua);
}

.lede {
  max-width: 56ch;
  color: var(--brass-soft);
  font-size: 17px;
  margin: 0 0 40px;
}

/* ---------- layout ---------- */

.instrument {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 28px;
  align-items: start;
}

@media (max-width: 820px) {
  .instrument { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.panel h2 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass-soft);
  margin: 0 0 22px;
  padding-bottom: 12px;
  border-bottom: var(--border);
}

/* ---------- form controls ---------- */

.field { margin-bottom: 22px; }
.field:last-child { margin-bottom: 0; }

.field-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 13px;
  color: var(--aqua-soft);
  margin-bottom: 8px;
}

.field-label .val {
  font-family: var(--font-mono);
  color: var(--paper);
  font-size: 15px;
}

.unit-toggle {
  display: inline-flex;
  background: var(--ink-soft);
  border-radius: 999px;
  padding: 2px;
  border: var(--border);
}

.unit-toggle button {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--brass-soft);
  cursor: pointer;
}

.unit-toggle button.active {
  background: var(--teal);
  color: var(--paper);
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--teal) 0%, var(--aqua) var(--fill, 50%), var(--ink-soft) var(--fill, 50%));
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--brass);
  border: 2px solid var(--ink);
  cursor: pointer;
  margin-top: -6.5px;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--brass);
  border: 2px solid var(--ink);
  cursor: pointer;
}

select,
input[type="number"] {
  width: 100%;
  background: var(--ink-soft);
  border: var(--border);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 14px;
  padding: 10px 12px;
  border-radius: 4px;
  appearance: none;
}

select {
  background-image: linear-gradient(45deg, transparent 50%, var(--brass) 50%),
                     linear-gradient(135deg, var(--brass) 50%, transparent 50%);
  background-position: calc(100% - 18px) center, calc(100% - 13px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

button, select, input {
  font: inherit;
}

*:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 2px;
}

/* ---------- gauge ---------- */

.gauge-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.gauge-svg { width: 150px; height: 320px; }

.gauge-reading {
  font-family: var(--font-mono);
  font-size: 40px;
  color: var(--paper);
  margin: 18px 0 2px;
  font-variant-numeric: tabular-nums;
}

.gauge-reading .unit { font-size: 18px; color: var(--aqua-soft); }

.gauge-range {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--brass-soft);
  margin-bottom: 4px;
}

.gauge-glasses {
  font-size: 13px;
  color: var(--aqua-soft);
  margin-top: 6px;
}

/* calibration notes = breakdown list */

.calibration {
  width: 100%;
  margin-top: 26px;
  padding-top: 18px;
  border-top: var(--border);
  text-align: left;
}

.calibration-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--aqua-soft);
  padding: 5px 0;
}

.calibration-row .amt { color: var(--paper); }
.calibration-row .amt.pos::before { content: "+ "; }
.calibration-row .amt.neg::before { content: "− "; }

/* ---------- share box ---------- */

.share-box {
  margin-top: 28px;
  display: flex;
  gap: 8px;
  align-items: center;
}

.share-input {
  flex: 1;
  background: var(--ink-soft);
  border: var(--border);
  color: var(--brass-soft);
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 10px 12px;
  border-radius: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-btn {
  background: var(--teal);
  color: var(--paper);
  border: none;
  border-radius: 4px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.15s ease;
  white-space: nowrap;
}

.copy-btn:hover { background: var(--teal-deep); }
.copy-btn.copied { background: var(--brass); color: var(--ink); }

/* ---------- trending ---------- */

.trending {
  margin-top: 48px;
}

.trending h2 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass-soft);
  margin-bottom: 16px;
}

.trending-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.trending-list a {
  display: inline-block;
  padding: 8px 14px;
  border: var(--border);
  border-radius: 999px;
  color: var(--aqua-soft);
  text-decoration: none;
  font-size: 13px;
  font-family: var(--font-mono);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.trending-list a:hover {
  border-color: var(--aqua);
  color: var(--paper);
}

/* ---------- footnote ---------- */

.disclaimer {
  margin-top: 40px;
  font-size: 12.5px;
  color: rgba(244, 239, 227, 0.5);
  max-width: 62ch;
}

.brand-credit {
  margin-top: 28px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(244, 239, 227, 0.35);
}

.brand-credit a { color: var(--brass-soft); text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- mobile ---------- */

@media (max-width: 820px) {
  .wrap { padding: 24px 18px 64px; }
  .panel { padding: 22px 18px; }
  .gauge-svg { width: 130px; height: 280px; }
  .gauge-reading { font-size: 34px; }
}

@media (max-width: 480px) {
  .wrap { padding: 20px 14px 56px; }
  .lede { font-size: 15.5px; margin-bottom: 28px; }
  .panel { padding: 18px 14px; border-radius: 4px; }
  .row-2 { grid-template-columns: 1fr; gap: 18px; }

  /* iOS zooms the page on focus if a form control is under 16px */
  select, input[type="number"] { font-size: 16px; }

  /* bigger touch target for slider thumbs */
  input[type="range"] { height: 4px; margin: 10px 0; }
  input[type="range"]::-webkit-slider-thumb { width: 22px; height: 22px; margin-top: -9.5px; }
  input[type="range"]::-moz-range-thumb { width: 20px; height: 20px; }

  .share-box { flex-wrap: wrap; }
  .share-input { min-width: 100%; order: 2; }
  .copy-btn { width: 100%; order: 1; }

  .trending-list a { padding: 10px 14px; } /* keep tap target comfortable */
}

@media (max-width: 360px) {
  h1 { font-size: 28px; }
  .gauge-svg { width: 110px; height: 250px; }
}