/* ============================================================
   Proportion Studio — site layer on top of template 02 (Swiss Index)
   Template stylesheet is untouched; this file adds the tool UI.
   ============================================================ */

:root {
  --paper: #ffffff;
  --soft: #f6f6f6;
  --accent-deep: #b33a00;
}

body {
  background: var(--paper);
}

[hidden] {
  display: none !important;
}

.container {
  max-width: 1200px;
}

/* ---------- top bar ---------- */
.topbar {
  background: #fff;
}

.topbar-inner {
  padding-left: 0;
  padding-right: 0;
}

.mobile-menu {
  display: none;
  position: relative;
  margin-left: auto;
}

.mobile-menu summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 1px solid var(--line);
  padding: 5px 10px;
}

.mobile-menu summary::-webkit-details-marker {
  display: none;
}

.mobile-menu summary::after {
  content: ' +';
  color: var(--accent);
}

.mobile-menu[open] summary::after {
  content: ' −';
}

.mobile-menu nav {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  z-index: 30;
  min-width: 200px;
  background: #fff;
  border: 2px solid var(--line);
  display: grid;
}

.mobile-menu nav a {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
}

.mobile-menu nav a:last-child {
  border-bottom: 0;
}

.mobile-menu nav a[aria-current='page'] {
  background: var(--accent-soft);
  color: var(--accent-deep);
}

/* ---------- hero ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
  border-left: 3px solid var(--accent);
  padding-left: 10px;
  margin-bottom: 16px;
}

.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
  border-left: 3px solid var(--accent);
  padding-left: 10px;
  margin-bottom: 16px;
}

.hero {
  padding: 48px 0 36px;
}

.hero h1 em {
  color: var(--accent);
}

.hero .lede {
  max-width: 62ch;
}

.hero-meta {
  gap: 18px;
}

.hero-meta span::before {
  content: '■';
  color: var(--accent);
  font-size: 0.55em;
  margin-right: 7px;
  vertical-align: 2px;
}

/* ---------- calculator panel ---------- */
.calc-shell {
  border-bottom: 2px solid var(--line);
  padding: 28px 0 36px;
}

.calc-panel {
  display: grid;
  grid-template-columns: 430px 1fr;
  border: 2px solid var(--line);
  background: #fff;
}

.calc-form {
  padding: 22px 22px 20px;
  border-right: 2px solid var(--line);
}

.calc-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.calc-head h2 {
  font-size: 1.35rem;
  text-transform: uppercase;
  margin-top: 4px;
}

.unit-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
}

.unit-toggle button {
  border: 0;
  background: #fff;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  padding: 6px 10px;
  cursor: pointer;
}

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

.unit-toggle button[aria-pressed='true'] {
  background: var(--line);
  color: #fff;
}

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

.field {
  display: flex;
  flex-direction: column;
  gap: 3px;
  border: 1px solid var(--line);
  padding: 7px 9px 6px;
  background: #fff;
}

.field:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.field-label {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.field-unit {
  color: var(--faint);
}

.field input {
  border: 0;
  outline: 0;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 1.12rem;
  font-weight: 500;
  color: var(--ink);
  width: 100%;
  padding: 0;
  appearance: textfield;
}

.field input::-webkit-outer-spin-button,
.field input::-webkit-inner-spin-button {
  appearance: none;
  margin: 0;
}

.field input::placeholder {
  color: #b9b9b9;
}

.field-hint {
  font-size: 0.66rem;
  line-height: 1.3;
  color: var(--faint);
}

.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.btn-primary,
.btn-ghost {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 9px 12px;
  border: 1px solid var(--line);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--line);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-ghost {
  background: #fff;
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-deep);
}

.form-error {
  margin-top: 10px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.72rem;
  padding: 7px 9px;
}

.privacy-note {
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--faint);
}

/* ---------- results ---------- */
.calc-results {
  padding: 22px;
  background: var(--soft);
  min-width: 0;
}

.results-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 12px;
  align-items: baseline;
  margin-bottom: 14px;
}

.results-head__label {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-deep);
  border: 1px solid var(--accent);
  padding: 4px 7px;
}

.results-head h2 {
  font-size: 1.15rem;
  text-transform: uppercase;
}

.results-head p {
  font-size: 0.78rem;
  color: var(--muted);
  max-width: 58ch;
}

.result-placeholder {
  border: 1px solid var(--line);
  padding: 18px;
  background: #fff;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 14px;
  align-items: center;
}

.placeholder-no {
  font-family: var(--font-head);
  font-size: 3rem;
  line-height: 1;
  color: var(--accent);
}

.result-placeholder p {
  font-size: 0.86rem;
  color: var(--muted);
  max-width: 54ch;
}

.ratio-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: #fff;
}

.ratio-card {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 10px 11px 9px;
  min-width: 0;
}

.ratio-card__head {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.ratio-card__no {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--accent-deep);
}

.ratio-card__head h3 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex: 1;
  min-width: 0;
}

.ratio-card__status {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  text-transform: uppercase;
  color: var(--faint);
  white-space: nowrap;
}

.ratio-card.is-within .ratio-card__status {
  color: #111;
}

.ratio-card.is-above .ratio-card__status,
.ratio-card.is-below .ratio-card__status {
  color: var(--accent-deep);
}

.ratio-card.is-descriptive .ratio-card__status {
  color: var(--faint);
}

.ratio-card.is-missing {
  background: #fcfcfc;
}

.ratio-card.is-missing .ratio-card__value {
  color: #c9c9c9;
}

.ratio-card__value {
  font-family: var(--font-head);
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 7px 0 4px;
  font-variant-numeric: tabular-nums;
}

.ratio-card__note {
  font-size: 0.66rem;
  line-height: 1.35;
  color: var(--muted);
  min-height: 2.7em;
}

.ratio-card__formula {
  font-family: var(--font-mono);
  font-size: 0.56rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--faint);
  margin-top: 5px;
}

/* ---------- gauge ---------- */
.gauge {
  position: relative;
  height: 26px;
  margin: 4px 0 2px;
}

.gauge__line {
  position: absolute;
  left: 0;
  right: 0;
  top: 13px;
  height: 1px;
  background: #d8d8d8;
}

.gauge__band {
  position: absolute;
  top: 9px;
  height: 9px;
  background: var(--accent-soft);
}

.gauge__marker {
  position: absolute;
  top: 3px;
  width: 2px;
  height: 21px;
  background: var(--accent);
  transform: translateX(-1px);
}

.gauge__min,
.gauge__max {
  position: absolute;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 0.5rem;
  color: var(--faint);
}

.gauge__max {
  right: 0;
}

/* ---------- interior pages ---------- */
.breadcrumbs {
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--faint);
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
}

.breadcrumbs li {
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

.breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--accent-deep);
}

.breadcrumbs__sep {
  color: #bdbdbd;
}

.page-head {
  border-bottom: 2px solid var(--line);
  padding: 10px 0 32px;
}

.page-head h1 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  text-transform: uppercase;
  max-width: 24ch;
  margin-bottom: 14px;
}

.page-head .lede {
  max-width: 66ch;
  color: var(--muted);
  font-size: 1.02rem;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--faint);
}

.page-head .meta-row {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--faint);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.page-body {
  padding: 36px 0 56px;
}

.prose-wide {
  max-width: 860px;
  margin: 0 auto;
}

.prose-wide h2 {
  font-size: 1.45rem;
  text-transform: uppercase;
  border-bottom: 2px solid var(--line);
  padding-bottom: 6px;
  margin: 34px 0 12px;
}

.prose-wide h3 {
  font-size: 1.05rem;
  margin: 24px 0 7px;
}

.prose-wide p {
  margin-bottom: 14px;
  color: #222;
}

.prose-wide ul,
.prose-wide ol {
  margin: 0 0 16px 20px;
}

.prose-wide li {
  margin-bottom: 6px;
}

.prose-wide a {
  color: var(--accent-deep);
  text-underline-offset: 3px;
}

.note-box,
.warn-box {
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  padding: 12px 14px;
  margin: 18px 0;
  font-size: 0.86rem;
  background: #fff;
}

.warn-box {
  border-left-color: #111;
  background: var(--soft);
}

.formula {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  background: #111;
  color: #f4f4f4;
  padding: 13px 14px;
  overflow-x: auto;
  margin: 14px 0;
}

/* ---------- tables ---------- */
.table-wrap {
  overflow-x: auto;
  margin: 18px 0;
  border: 1px solid var(--line);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  border-bottom: 1px solid var(--line-soft);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

.data-table th {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: #f5f5f5;
  border-bottom: 1px solid var(--line);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.data-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

@media (max-width: 680px) {
  .data-table {
    min-width: 620px;
  }
}

/* ---------- figure ---------- */
.proportion-figure {
  margin: 0;
  border: 2px solid var(--line);
  background: #fff;
  padding: 10px;
  max-width: 340px;
}

.proportion-figure svg {
  width: 100%;
  height: auto;
  display: block;
}

.proportion-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--faint);
  border-top: 1px solid var(--line-soft);
  padding-top: 7px;
  margin-top: 7px;
  line-height: 1.45;
}

/* ---------- ratio cards on interior pages ---------- */
.ratio-detail {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  align-items: start;
  border-top: 2px solid var(--line);
  padding: 28px 0;
}

.ratio-detail:first-of-type {
  border-top: 0;
}

.ratio-detail__figure {
  position: sticky;
  top: 90px;
}

.ratio-detail h2 {
  font-size: 1.35rem;
  text-transform: uppercase;
  border-bottom: 0;
  padding-bottom: 0;
}

.ratio-detail__formula {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-deep);
  margin-bottom: 10px;
}

.ratio-detail__ref {
  border: 1px solid var(--line);
  padding: 10px 12px;
  font-size: 0.8rem;
  background: var(--soft);
  margin: 12px 0;
}

.ratio-copy {
  min-width: 0;
}

.ratio-copy > :first-child {
  margin-top: 0;
}

.ratio-copy h2 {
  font-size: 1.3rem;
  text-transform: uppercase;
  border-bottom: 2px solid var(--line);
  padding-bottom: 6px;
  margin: 28px 0 10px;
}

.ratio-copy h3 {
  font-size: 1.02rem;
  margin: 22px 0 7px;
}

.ratio-copy p {
  margin-bottom: 14px;
  color: #222;
}

.ratio-copy ul,
.ratio-copy ol {
  margin: 0 0 16px 20px;
}

.ratio-copy li {
  margin-bottom: 6px;
}

.ratio-copy a {
  color: var(--accent-deep);
  text-underline-offset: 3px;
}

.ratio-copy .formula {
  margin: 14px 0;
}

@media (max-width: 760px) {
  .ratio-detail {
    grid-template-columns: 1fr;
  }
  .ratio-detail__figure {
    position: static;
    max-width: 240px;
  }
}

/* ---------- chart ---------- */
.chart-item {
  border-top: 2px solid var(--line);
  padding: 22px 0;
  scroll-margin-top: 90px;
}

.chart-item__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.chart-item__no {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--accent-deep);
  flex-shrink: 0;
}

.chart-item h2 {
  font-size: 1.22rem;
  text-transform: uppercase;
  border: 0;
  margin: 0;
  padding: 0;
}

.chart-item__head a {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.chart-item__formula {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-deep);
  margin: 5px 0 12px;
}

.chart-item__body {
  display: grid;
  grid-template-columns: 104px 1fr;
  gap: 6px 14px;
  margin: 0;
}

.chart-item__body dt {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--faint);
}

.chart-item__body dd {
  margin: 0;
  font-size: 0.84rem;
  color: #222;
}

@media (max-width: 560px) {
  .chart-item__body {
    grid-template-columns: 1fr;
    gap: 2px;
  }
  .chart-item__body dt {
    margin-top: 8px;
  }
}

/* ---------- FAQ ---------- */
.faq-block {
  padding: 34px 0 8px;
}

.faq-block h2 {
  font-size: 1.3rem;
  text-transform: uppercase;
  border-bottom: 2px solid var(--line);
  padding-bottom: 6px;
  margin-bottom: 10px;
}

.faq-list {
  border-top: 1px solid var(--line-soft);
}

.faq-list details {
  border-bottom: 1px solid var(--line-soft);
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: '+';
  color: var(--accent-deep);
}

.faq-list details[open] summary::after {
  content: '−';
}

.faq-list p {
  padding: 0 0 14px;
  font-size: 0.84rem;
  color: var(--muted);
  max-width: 72ch;
}

/* ---------- sources ---------- */
.source-list {
  counter-reset: source;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.source-list li {
  counter-increment: source;
  position: relative;
  padding: 0 0 12px 28px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
}

.source-list li::before {
  content: '[' counter(source) ']';
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--accent-deep);
}

.source-list a {
  color: var(--accent-deep);
  word-break: break-word;
}

/* ---------- footer / responsive ---------- */
.footer {
  margin-top: 0;
}

.footer-compare {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-compare__label {
  color: var(--faint);
}

.footer-compare a {
  color: var(--ink);
  text-decoration: none;
}

.footer-compare a:hover {
  color: var(--accent-deep);
}

@media (max-width: 960px) {
  .calc-panel {
    grid-template-columns: 1fr;
  }
  .calc-form {
    border-right: 0;
    border-bottom: 2px solid var(--line);
  }
  .ratio-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .topnav {
    display: none;
  }
  .mobile-menu {
    display: block;
  }
  .topbar-inner {
    padding: 12px 0;
    align-items: center;
  }
  .hero {
    padding: 40px 0 32px;
  }
  .hero h1 {
    font-size: clamp(2.1rem, 9vw, 3rem);
  }
  .page-head h1 {
    font-size: clamp(1.8rem, 8vw, 2.6rem);
  }
  .meta-row > span:nth-child(even) {
    display: none;
  }
  .footer-inner {
    padding-bottom: 54px;
  }
}

@media (max-width: 560px) {
  .container {
    padding: 0 18px;
  }
  .calc-form,
  .calc-results {
    padding: 16px;
  }
  .field-grid {
    grid-template-columns: 1fr;
  }
  .ratio-grid {
    grid-template-columns: 1fr;
  }
  .results-head {
    grid-template-columns: 1fr;
  }
  .results-head__label {
    grid-row: auto;
    justify-self: start;
  }
  .result-placeholder {
    grid-template-columns: 1fr;
  }
  .ratio-card__note {
    min-height: 0;
  }
}

@media print {
  .topbar,
  .footer,
  .back-top,
  .calc-form,
  .unit-toggle,
  .breadcrumbs {
    display: none !important;
  }
  .calc-panel {
    display: block;
    border: 0;
  }
  .calc-results {
    background: #fff;
  }
  .ratio-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media print {
  .proportion-figure,
  .ratio-detail,
  .data-table {
    break-inside: avoid;
  }
}