/* ==========================================================================
   Wellnum — shared design system (light)
   Concept: a "measurement ledger" — the quiet ritual of checking your own
   numbers, rendered like an old apothecary's logbook. Warm paper pages,
   white cards, hairline rules, a hand-built dial for the signature result.
   Numbers always sit in mono type, like they were logged by hand.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --paper: #faf6ea;
  --paper-dim: #f0e8d2;
  --card: #ffffff;
  --paper-line: rgba(27, 36, 48, 0.13);
  --paper-line-soft: rgba(27, 36, 48, 0.07);

  --sage: #3f6b54;
  --sage-deep: #2c4d3c;
  --sage-tint: #e3ece6;

  --ochre: #a86a29;
  --ochre-deep: #7f4f1d;

  --navy: #10192a;
  --navy-deep: #0a1220;

  --ink: #1b2430;
  --ink-soft: #5c6372;
  --ink-faint: #8a90a0;

  --radius: 3px;
  --max-w: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
  line-height: 1.12;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
  color: var(--navy);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1em; }

a { color: inherit; }

.mono, .num, input, select {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
}

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

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0;
  border-bottom: 1px solid var(--paper-line);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.brand-tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ochre);
  border-left: 1px solid currentColor;
  padding-left: 10px;
}

nav.site-nav { display: flex; gap: 26px; }
nav.site-nav a {
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 3px;
}
nav.site-nav a:hover { color: var(--ochre-deep); }
nav.site-nav a.active { color: var(--ochre-deep); }

.site-footer {
  border-top: 1px solid var(--paper-line);
  margin-top: 90px;
  padding: 36px 0 50px;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.site-footer .foot-row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}
.site-footer nav { display: flex; gap: 18px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--ochre-deep); }

/* -------------------------------------------------------------------- */
/* ledger index — the numbered catalogue rows used on the homepage       */
/* -------------------------------------------------------------------- */

.ledger { display: grid; gap: 16px; }
.ledger-row {
  --accent: var(--sage);
  display: grid;
  grid-template-columns: 72px 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 26px 28px;
  background: var(--card);
  border: 1px solid var(--paper-line);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 10px 24px -18px rgba(27, 36, 48, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.ledger-row:hover,
.ledger-row:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px -18px rgba(27, 36, 48, 0.4);
  border-color: var(--accent);
}
.ledger-index {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(27, 36, 48, 0.05);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  flex-shrink: 0;
  transition: transform 0.18s ease, background 0.18s ease;
}
.ledger-row:hover .ledger-index { transform: scale(1.08); background: var(--accent); color: #fff; }
.ledger-title { font-family: 'Fraunces', serif; font-size: 1.5rem; font-weight: 600; color: var(--navy); }
.ledger-desc { font-size: 0.92rem; color: var(--ink-soft); margin-top: 4px; max-width: 46ch; }
.ledger-go {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 8px 14px;
  border-radius: var(--radius);
  white-space: nowrap;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}
.ledger-row:hover .ledger-go,
.ledger-row:focus-visible .ledger-go { background: var(--accent); color: #fff; border-color: var(--accent); box-shadow: 0 6px 16px -8px rgba(27, 36, 48, 0.5); }

/* -------------------------------------------------------------------- */
/* hero                                                                  */
/* -------------------------------------------------------------------- */

.hero { padding: 70px 0 50px; }
.hero-eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ochre-deep);
  margin-bottom: 18px;
}
.hero p.lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 56ch; }

/* -------------------------------------------------------------------- */
/* calculator card                                                       */
/* -------------------------------------------------------------------- */

.calc-shell { padding: 54px 0 100px; }

.calc-head { margin-bottom: 40px; max-width: 62ch; }
.calc-head .kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ochre-deep);
  display: block;
  margin-bottom: 14px;
}
.calc-head p { color: var(--ink-soft); }

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--card);
  color: var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--paper-line);
  box-shadow: 0 20px 45px -25px rgba(27, 36, 48, 0.25);
}

.calc-form { padding: 44px; }
.calc-result { padding: 44px; background: var(--paper-dim); display: flex; flex-direction: column; justify-content: center; }

@media (max-width: 760px) {
  .calc-grid { grid-template-columns: 1fr; }
}

.field { margin-bottom: 22px; }
.field label {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.field input, .field select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--paper-line);
  background: #fff;
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--ink);
}
.field input:focus, .field select:focus, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--sage);
  outline-offset: 2px;
}

.unit-toggle {
  display: inline-flex;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 26px;
}
.unit-toggle button {
  border: none;
  background: transparent;
  padding: 8px 16px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  color: var(--ink-soft);
}
.unit-toggle button.active { background: var(--sage); color: #fff; }

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

button.calc-btn {
  width: 100%;
  padding: 14px;
  background: var(--navy);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  margin-top: 6px;
}
button.calc-btn:hover { background: var(--sage-deep); }

.result-figure {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 3.6rem;
  font-weight: 600;
  line-height: 1;
  color: var(--sage-deep);
}
.result-unit { font-size: 1rem; color: var(--ink-soft); margin-left: 6px; }
.result-label {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.result-category {
  display: inline-block;
  margin-top: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-family: 'IBM Plex Mono', monospace;
  background: var(--sage);
  color: #fff;
}
.result-note { margin-top: 18px; font-size: 0.88rem; color: var(--ink-soft); }

.gauge-wrap { margin-top: 26px; }

/* -------------------------------------------------------------------- */
/* tool nav strip — quick links between the four calculators             */
/* -------------------------------------------------------------------- */

.tool-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--paper-line);
}
.tool-strip a {
  text-decoration: none;
  font-size: 0.82rem;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--ink-soft);
  border: 1px solid var(--paper-line);
  padding: 8px 14px;
  border-radius: var(--radius);
}
.tool-strip a.active { color: var(--ochre-deep); border-color: var(--ochre); }
.tool-strip a:hover { color: var(--ochre-deep); border-color: var(--ochre); }

/* -------------------------------------------------------------------- */
/* article / blog pages                                                  */
/* -------------------------------------------------------------------- */

.article-shell { padding: 60px 0 100px; }
.article-shell .kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ochre-deep);
  display: block;
  margin-bottom: 16px;
}
.article-body { max-width: 68ch; }
.article-body p { color: var(--ink-soft); font-size: 1.02rem; }
.article-body h2 { margin-top: 2em; color: var(--navy); }
.article-body ul { color: var(--ink-soft); padding-left: 22px; }
.article-body li { margin-bottom: 8px; }
.byline { font-size: 0.85rem; color: var(--ink-faint); margin-bottom: 40px; }

.article-index { margin-top: 90px; padding-top: 30px; border-top: 1px solid var(--paper-line); }
.article-index h3 { margin-bottom: 20px; }
.article-list { display: grid; gap: 4px; }
.article-list a {
  text-decoration: none;
  display: block;
  padding: 14px 0;
  border-bottom: 1px solid var(--paper-line);
  font-family: 'Fraunces', serif;
  font-size: 1.1rem;
  color: var(--navy);
}
.article-list a:hover { color: var(--ochre-deep); }

/* -------------------------------------------------------------------- */
/* simple content pages (about, contact, privacy, terms)                 */
/* -------------------------------------------------------------------- */

.page-shell { padding: 60px 0 110px; max-width: 68ch; }
.page-shell .kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ochre-deep);
  display: block;
  margin-bottom: 16px;
}
.page-shell p { color: var(--ink-soft); }
.page-shell h2 { margin-top: 1.6em; }
.page-shell a.link { color: var(--ochre-deep); text-decoration: underline; }

form.contact-form { margin-top: 34px; display: grid; gap: 18px; max-width: 480px; }
form.contact-form label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: block;
  margin-bottom: 8px;
}
form.contact-form input, form.contact-form textarea {
  width: 100%;
  background: #fff;
  border: 1px solid var(--paper-line);
  color: var(--ink);
  padding: 11px 12px;
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
}
form.contact-form textarea { min-height: 130px; resize: vertical; }

/* -------------------------------------------------------------------- */
/* misc                                                                  */
/* -------------------------------------------------------------------- */

.section-divider { border: none; border-top: 1px solid var(--paper-line); margin: 60px 0; }

/* -------------------------------------------------------------------- */
/* responsive                                                            */
/* -------------------------------------------------------------------- */

html { overflow-x: hidden; }
body { overflow-x: hidden; }
img, svg { max-width: 100%; }

@media (max-width: 900px) {
  .wrap { padding: 0 26px; }
  .calc-form, .calc-result { padding: 34px 30px; }
  .hero { padding: 54px 0 40px; }
}

@media (max-width: 720px) {
  .wrap { padding: 0 22px; }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 0;
  }
  nav.site-nav { gap: 18px; flex-wrap: wrap; }

  .hero { padding: 40px 0 34px; }
  .hero p.lead { font-size: 1.02rem; }

  .ledger-row {
    grid-template-columns: 56px 1fr;
    grid-template-areas:
      "index title"
      "go go";
    padding: 22px 20px;
    gap: 14px 18px;
  }
  .ledger-index { width: 48px; height: 48px; font-size: 0.95rem; grid-area: index; }
  .ledger-row > span:nth-child(2) { grid-area: title; }
  .ledger-go {
    grid-area: go;
    text-align: center;
    margin-top: 4px;
    width: 100%;
  }

  .calc-grid { grid-template-columns: 1fr; }
  .calc-form, .calc-result { padding: 28px 22px; }
  .result-figure { font-size: 2.8rem; }

  .row-2 { grid-template-columns: 1fr 1fr; gap: 10px; }

  .tool-strip { gap: 8px; }
  .tool-strip a { flex: 1 1 calc(50% - 8px); text-align: center; }

  .site-footer .foot-row { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 440px) {
  .wrap { padding: 0 20px; }
  .brand-tag { display: none; }
  h1 { font-size: clamp(1.9rem, 9vw, 2.4rem); }
  .calc-form, .calc-result { padding: 22px 18px; }
  .result-figure { font-size: 2.3rem; }
  .ledger-title { font-size: 1.28rem; }
  .row-2 { grid-template-columns: 1fr; }
}

@media (max-width: 360px) {
  .field input, .field select { font-size: 0.86rem; padding: 10px 10px; }
  .unit-toggle button { padding: 8px 12px; font-size: 0.72rem; }
}

/* -------------------------------------------------------------------- */
/* ad slots                                                              */
/* -------------------------------------------------------------------- */

.ad-slot {
  width: 100%;
  max-width: 728px;
  margin: 48px auto;
  text-align: center;
  overflow: hidden;
}
.ad-slot .adsbygoogle { display: block; width: 100%; }
.ad-slot-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  opacity: 0.55;
  margin-bottom: 8px;
}
.article-body + .ad-slot { margin-top: 40px; }

@media (max-width: 440px) {
  .ad-slot { margin: 34px auto; }
}

/* comfortable tap targets on touch devices */
@media (hover: none) {
  .field input, .field select { padding: 13px 12px; }
  .unit-toggle button { padding: 11px 16px; }
  button.calc-btn { padding: 16px; }
  .ledger-go { padding: 11px 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}