/* ============================================================
   BMI Calculator — Design tokens
   A page built like a well-kept instrument: paper, brass, ink.
   ============================================================ */

:root {
  /* Color */
  --paper: #EAE7DD;
  --paper-raised: #F5F3EA;
  --ink: #20281F;
  --ink-soft: #565C4F;
  --line: #C9C3AF;
  --line-strong: #A9A186;
  --brass: #A6752C;
  --brass-dark: #7E5A20;
  --pine: #3C6E58;
  --pine-bg: #E4EBE5;
  --rust: #9C4A32;
  --rust-bg: #F1E2DC;

  /* Gauge zone colors */
  --zone-under: #6E8CA0;
  --zone-normal: #3C6E58;
  --zone-over: #C68A3D;
  --zone-obese: #9C4A32;

  /* Type */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;

  --radius: 3px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a {
  color: var(--brass-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--brass); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header .wrap {
  max-width: 920px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--brass-dark);
  border: 1px solid var(--brass-dark);
  padding: 3px 6px;
  border-radius: var(--radius);
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  gap: 22px;
  font-size: 14px;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--brass);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  cursor: pointer;
}

@media (max-width: 640px) {
  .nav-toggle { display: inline-block; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    background: var(--paper-raised);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    padding: 6px 24px 14px;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 10px 0; border-bottom: 1px solid var(--line); }
}

/* ---------- Hero ---------- */

.hero {
  padding: 56px 0 8px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass-dark);
  margin: 0 0 14px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(34px, 5.5vw, 52px);
  line-height: 1.08;
  margin: 0 0 16px;
  max-width: 14ch;
}

.hero p.lede {
  color: var(--ink-soft);
  max-width: 46ch;
  font-size: 17px;
  margin: 0 0 40px;
}

/* ---------- Calculator card ---------- */

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 28px;
}

.unit-toggle {
  display: inline-flex;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 28px;
}

.unit-toggle button {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  background: transparent;
  border: none;
  color: var(--ink);
  padding: 9px 18px;
  cursor: pointer;
}

.unit-toggle button + button { border-left: 1px solid var(--ink); }

.unit-toggle button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper-raised);
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 8px;
}

@media (max-width: 560px) {
  .field-grid { grid-template-columns: 1fr; }
}

.field label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.field-row { display: flex; gap: 10px; }

.field input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 10px 12px;
}

.field input:focus { border-color: var(--brass); }

.unit-suffix {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
  align-self: center;
  white-space: nowrap;
}

.calc-btn {
  margin-top: 24px;
  width: 100%;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  background: var(--ink);
  color: var(--paper-raised);
  border: none;
  border-radius: var(--radius);
  padding: 15px 20px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.calc-btn:hover { background: var(--brass-dark); }

.error-msg {
  color: var(--rust);
  font-size: 13px;
  margin-top: 10px;
  min-height: 16px;
}

/* ---------- Result ---------- */

.result {
  display: none;
}
.result.visible { display: block; }

.result-top {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.result-number {
  font-family: var(--font-mono);
  font-size: 56px;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.result-category {
  font-family: var(--font-display);
  font-size: 20px;
  padding: 4px 12px;
  border-radius: var(--radius);
}

.result-category.under { background: var(--paper); color: var(--zone-under); border: 1px solid var(--zone-under); }
.result-category.normal { background: var(--pine-bg); color: var(--pine); border: 1px solid var(--pine); }
.result-category.over { background: #F4EBDB; color: var(--zone-over); border: 1px solid var(--zone-over); }
.result-category.obese { background: var(--rust-bg); color: var(--rust); border: 1px solid var(--rust); }

/* Instrument gauge */

.gauge {
  position: relative;
  margin: 18px 0 10px;
}

.gauge-track {
  display: flex;
  height: 14px;
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--ink);
}

.gauge-track span { display: block; height: 100%; }
/* Widths match the gauge's 12–42 scale and its 18.5 / 25 / 30 tick marks. */
.gz-under  { background: var(--zone-under); flex: 6.5; }  /* 12 – 18.5 */
.gz-normal { background: var(--zone-normal); flex: 6.5; } /* 18.5 – 25 */
.gz-over   { background: var(--zone-over); flex: 5; }     /* 25 – 30 */
.gz-obese  { background: var(--zone-obese); flex: 12; }   /* 30 – 42 */

.gauge-ticks {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  margin-top: 6px;
}

.gauge-needle {
  position: absolute;
  top: -10px;
  width: 2px;
  height: 34px;
  background: var(--brass-dark);
  left: 0%;
  transition: left 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.gauge-needle::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 7px solid var(--brass-dark);
}

.result-range {
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.result-range strong { color: var(--ink); font-family: var(--font-mono); }

/* ---------- Reference table ---------- */

.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 8px 0 40px;
}
.ref-table th, .ref-table td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
}
.ref-table th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 500;
}
.ref-table td:first-child { font-family: var(--font-mono); white-space: nowrap; }
.swatch {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  margin-right: 8px;
}

/* ---------- Prose sections (about / legal pages) ---------- */

.section {
  padding: 8px 0 44px;
  border-top: 1px solid var(--line);
}
.section h2 {
  font-family: var(--font-display);
  font-size: 24px;
  margin: 32px 0 12px;
}
.section h2:first-child { margin-top: 32px; }
.section p { color: var(--ink-soft); }
.section p, .section li { max-width: 68ch; }
.section ul { color: var(--ink-soft); padding-left: 20px; }
.section li { margin-bottom: 6px; }

.legal-page .hero { padding-bottom: 8px; }
.legal-updated {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: -6px;
}
.legal-page h2 {
  font-family: var(--font-display);
  font-size: 21px;
  margin: 34px 0 10px;
}
.legal-page h2:first-of-type { margin-top: 20px; }
.legal-page p, .legal-page li { color: var(--ink-soft); max-width: 70ch; }
.legal-page ul { padding-left: 20px; }
.legal-page li { margin-bottom: 6px; }
.legal-page .callout {
  background: var(--rust-bg);
  border: 1px solid var(--rust);
  border-radius: var(--radius);
  padding: 16px 18px;
  color: var(--ink);
  font-size: 15px;
  margin-bottom: 28px;
}
.legal-page .callout strong { color: var(--rust); }

/* ---------- Ad slots ---------- */

.ad-slot {
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 32px 0;
}

/* ---------- Cookie consent ---------- */

.cookie-banner {
  position: fixed;
  left: 16px; right: 16px; bottom: 16px;
  max-width: 640px;
  margin: 0 auto;
  background: var(--ink);
  color: var(--paper-raised);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: none;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  z-index: 50;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}
.cookie-banner.visible { display: flex; }
.cookie-banner p { margin: 0; font-size: 13px; max-width: 46ch; color: #D9D6C9; }
.cookie-banner a { color: #E7C88A; }
.cookie-actions { display: flex; gap: 10px; flex-shrink: 0; }
.cookie-actions button {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  padding: 9px 14px;
  cursor: pointer;
  border: 1px solid transparent;
}
.cookie-accept { background: var(--brass); color: var(--ink); border: none; }
.cookie-decline { background: transparent; color: var(--paper-raised); border-color: #545B49; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 32px 0 60px;
}
.site-footer .wrap {
  max-width: 920px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--ink-soft);
}
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--ink-soft); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }
.footer-note { max-width: 60ch; margin-top: 14px; font-size: 12px; color: var(--ink-soft); }