/* Biontario — built on Design System v1.0 (September 2026) */

:root {
  --color-brand: #154734;
  --color-background: #f8f4e9;
  --color-text: #252a27;
  --color-surface-muted: #dce4d8;
  --color-status-critical: #b63b42;
  --color-white: #ffffff;
  --color-rule: rgba(37, 42, 39, 0.2);

  --font-sans: "Aptos", "Arial", "Helvetica", sans-serif;
  --font-display: "Aptos Display", "Aptos", "Arial", sans-serif;
  --font-serif: "Source Serif 4", Georgia, serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 3rem;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-12: 6rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --rule-width: 1px;

  --page-width: 72rem;
  --gutter: clamp(1rem, 4vw, 2rem);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--color-brand);
  text-wrap: balance;
}
h1 { font-size: clamp(2.25rem, 5.2vw, var(--text-3xl)); letter-spacing: -0.025em; }
h2 { font-size: clamp(1.75rem, 3.4vw, var(--text-2xl)); }
h3 { font-size: var(--text-lg); line-height: 1.25; }
p { margin: 0; text-wrap: pretty; }

a { color: var(--color-brand); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--color-brand);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
.on-brand :focus-visible { outline-color: var(--color-background); }

.skip-link {
  position: absolute; left: var(--space-2); top: -4rem; z-index: 100;
  padding: var(--space-1) var(--space-2);
  background: var(--color-brand); color: var(--color-white);
  border-radius: var(--radius-sm);
}
.skip-link:focus { top: var(--space-2); }

.container { width: min(100% - 2 * var(--gutter), var(--page-width)); margin-inline: auto; }

.label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.lede { font-size: var(--text-lg); line-height: 1.5; max-width: 38rem; }
.serif { font-family: var(--font-serif); }

/* ---------- Buttons ---------- */
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-1);
  min-height: 48px; padding: 0 var(--space-3);
  border: var(--rule-width) solid var(--color-brand);
  border-width: 1.5px;
  border-radius: var(--radius-sm);
  font: 600 var(--text-base)/1 var(--font-sans);
  text-decoration: none; cursor: pointer;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}
.button--primary { background: var(--color-brand); color: var(--color-white); }
.button--primary:hover { background: #0e3325; border-color: #0e3325; }
.button--secondary { background: transparent; color: var(--color-brand); }
.button--secondary:hover { background: var(--color-surface-muted); }
.button:active { transform: translateY(1px); }
.button[disabled] { opacity: 0.6; cursor: progress; }

.on-brand .button--primary { background: var(--color-background); color: var(--color-brand); border-color: var(--color-background); }
.on-brand .button--primary:hover { background: var(--color-white); border-color: var(--color-white); }
.on-brand .button--secondary { color: var(--color-background); border-color: var(--color-background); }
.on-brand .button--secondary:hover { background: rgba(248, 244, 233, 0.12); }

.text-link { font-weight: 600; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-background);
  border-bottom: var(--rule-width) solid var(--color-rule);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  min-height: 72px;
}
.brand { display: block; line-height: 0; border-radius: var(--radius-sm); }
.brand img { width: 136px; }

.nav { display: flex; align-items: center; gap: var(--space-4); }
.nav ul { display: flex; gap: var(--space-3); list-style: none; margin: 0; padding: 0; }
.nav a:not(.button) {
  display: inline-flex; align-items: center; min-height: 44px;
  font-family: var(--font-display); font-weight: 600;
  color: var(--color-text); text-decoration: none;
  border-bottom: 2px solid transparent;
}
.nav a:not(.button):hover { color: var(--color-brand); text-decoration: underline; text-underline-offset: 0.3em; }
.nav a[aria-current="page"] { color: var(--color-brand); border-bottom-color: var(--color-brand); border-radius: 0; }
.nav .button { min-height: 44px; }

.nav-toggle {
  display: none; min-width: 44px; min-height: 44px; padding: 0 var(--space-2);
  background: transparent; color: var(--color-brand);
  border: 1.5px solid var(--color-brand); border-radius: var(--radius-sm);
  font: 600 var(--text-sm)/1 var(--font-sans); cursor: pointer;
}

@media (max-width: 52rem) {
  .nav-toggle { display: inline-flex; align-items: center; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; align-items: stretch; gap: var(--space-2);
    padding: var(--space-2) var(--gutter) var(--space-3);
    background: var(--color-background);
    border-bottom: var(--rule-width) solid var(--color-rule);
  }
  .nav.is-open { display: flex; }
  .nav ul { flex-direction: column; gap: 0; }
  .nav li { border-top: var(--rule-width) solid var(--color-rule); }
  .nav a:not(.button) { width: 100%; min-height: 48px; border-bottom: 0; }
  .nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 0.3em; text-decoration-thickness: 2px; }
}

/* ---------- Sections ---------- */
.section { padding-block: var(--space-12); }
.section--tight { padding-block: var(--space-8); }
.section__head { display: grid; gap: var(--space-2); margin-bottom: var(--space-6); max-width: 40rem; }
.eyebrow { color: var(--color-brand); }

.on-brand { background: var(--color-brand); color: var(--color-background); }
.on-brand h1, .on-brand h2, .on-brand h3, .on-brand a { color: var(--color-background); }
.on-brand .eyebrow { color: var(--color-surface-muted); }

/* ---------- Hero ---------- */
.hero { padding-block: var(--space-8) var(--space-12); overflow: hidden; }
.hero__grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: var(--space-8); align-items: center;
}
.hero__copy { display: grid; gap: var(--space-3); justify-items: start; }
.hero__copy h1 { max-width: 14ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-1); }

.hero__visual { position: relative; padding: var(--space-4) 0 var(--space-4) var(--space-4); }
.hero__drop {
  position: absolute; z-index: 0; right: -22%; top: -14%; width: 88%; height: auto;
}
.datasheet {
  position: relative; z-index: 1;
  background: var(--color-white);
  border: var(--rule-width) solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: 0 1px 0 rgba(21, 71, 52, 0.06);
}
.datasheet__top { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.datasheet__top img { width: 28px; }
.datasheet__top .label { color: var(--color-text); opacity: 0.75; }
.datasheet h2 { margin-top: var(--space-3); font-size: var(--text-xl); }
.datasheet__meta { margin-top: 4px; font-size: var(--text-sm); }
.datasheet .spec { margin-top: var(--space-2); }

@media (max-width: 52rem) {
  .hero { padding-block: var(--space-6) var(--space-8); }
  .hero__grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .hero__visual { padding: 0; }
  .hero__drop { right: -30%; top: -12%; width: 80%; }
}

/* ---------- Specification table ---------- */
.spec { width: 100%; border-collapse: collapse; font-size: var(--text-sm); }
.spec th, .spec td {
  padding: 0.6rem 0; text-align: left; vertical-align: top;
  border-top: var(--rule-width) solid var(--color-rule);
}
.spec tr:last-child th, .spec tr:last-child td { border-bottom: var(--rule-width) solid var(--color-rule); }
.spec th { width: 38%; padding-right: var(--space-2); font-weight: 400; color: var(--color-text); opacity: 0.8; }
.spec td { font-weight: 600; }

/* ---------- Proof points ---------- */
.proof { border-block: var(--rule-width) solid var(--color-rule); }
.proof__list {
  display: grid; grid-template-columns: repeat(4, 1fr); list-style: none; margin: 0; padding: 0;
}
.proof__item {
  display: grid; gap: var(--space-2); align-content: start;
  padding: var(--space-4) var(--space-3);
  border-left: var(--rule-width) solid var(--color-rule);
}
.proof__item:first-child { border-left: 0; padding-left: 0; }
.proof__item img { width: 32px; height: 32px; }
.proof__item p { font-size: var(--text-sm); max-width: 18rem; }
.proof__item strong { display: block; margin-bottom: 4px; font-family: var(--font-display); font-size: var(--text-base); color: var(--color-brand); }
@media (max-width: 62rem) {
  .proof__list { grid-template-columns: 1fr 1fr; }
  .proof__item:nth-child(3) { border-left: 0; padding-left: 0; }
  .proof__item:nth-child(n+3) { border-top: var(--rule-width) solid var(--color-rule); }
}
@media (max-width: 34rem) {
  .proof__list { grid-template-columns: 1fr; }
  .proof__item { border-left: 0; padding-left: 0; padding-block: var(--space-3); }
  .proof__item + .proof__item { border-top: var(--rule-width) solid var(--color-rule); }
}

/* ---------- Range index ---------- */
.range { list-style: none; margin: 0; padding: 0; border-top: var(--rule-width) solid var(--color-brand); }
.range__row {
  display: grid; grid-template-columns: 4rem 1fr 1.3fr 9rem; gap: var(--space-3); align-items: baseline;
  padding: var(--space-4) 0;
  border-bottom: var(--rule-width) solid var(--color-rule);
}
.range__num { font-family: var(--font-display); font-weight: 600; color: var(--color-brand); opacity: 0.6; }
.range__row h3 { font-size: var(--text-xl); }
.range__row p { max-width: 34rem; }
.range__row a { font-weight: 600; white-space: nowrap; display: inline-flex; gap: 0.4rem; min-height: 44px; align-items: center; justify-self: end; }
@media (max-width: 52rem) {
  .range__row { grid-template-columns: 2.5rem 1fr; row-gap: var(--space-1); }
  .range__row p, .range__row a { grid-column: 2; justify-self: start; }
}

/* ---------- Traceability (on brand) ---------- */
.trace__grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); align-items: center; }
.trace__copy { display: grid; gap: var(--space-3); justify-items: start; }
.trace__steps { list-style: none; margin: var(--space-1) 0 0; padding: 0; display: grid; gap: 0; width: 100%; }
.trace__steps li {
  display: grid; grid-template-columns: 1.75rem 1fr; gap: var(--space-2);
  padding: var(--space-2) 0; border-top: var(--rule-width) solid rgba(248, 244, 233, 0.25);
}
.trace__steps li:last-child { border-bottom: var(--rule-width) solid rgba(248, 244, 233, 0.25); }
.trace__steps span { color: var(--color-surface-muted); font-weight: 600; }

.label-card {
  background: var(--color-background); color: var(--color-text);
  border-radius: var(--radius-md); padding: var(--space-4); max-width: 26rem; margin-inline: auto; width: 100%;
  display: grid; gap: var(--space-3);
}
.label-card img.wordmark { width: 168px; }
.label-card h3 { font-size: var(--text-xl); color: var(--color-brand); }
.label-card .format { font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; }
.label-card__handling {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-2);
  padding-top: var(--space-2); border-top: var(--rule-width) solid var(--color-rule);
}
.label-card__handling dt { font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase; opacity: 0.75; }
.label-card__handling dd { margin: 2px 0 0; font-weight: 600; }
.label-card .handling-note {
  display: flex; align-items: center; gap: var(--space-1);
  font-size: var(--text-sm); padding: var(--space-1) var(--space-2);
  background: var(--color-surface-muted); border-radius: var(--radius-sm);
}
.marker { flex: none; width: 10px; height: 10px; background: var(--color-status-critical); border-radius: 2px; }
@media (max-width: 52rem) { .trace__grid { grid-template-columns: 1fr; gap: var(--space-6); } }

/* ---------- Working with us ---------- */
.approach { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: var(--space-8); }
.approach__quote {
  font-family: var(--font-serif); font-size: clamp(1.5rem, 3vw, var(--text-2xl)); line-height: 1.3;
  color: var(--color-brand); max-width: 22ch;
}
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; }
.steps li {
  counter-increment: step; display: grid; grid-template-columns: 3rem 1fr; gap: var(--space-2);
  padding: var(--space-3) 0; border-top: var(--rule-width) solid var(--color-rule);
}
.steps li:last-child { border-bottom: var(--rule-width) solid var(--color-rule); }
.steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-display); font-weight: 600; color: var(--color-brand); opacity: 0.6;
}
.steps h3 { margin-bottom: 4px; }
@media (max-width: 52rem) { .approach { grid-template-columns: 1fr; gap: var(--space-4); } }

/* ---------- CTA + footer ---------- */
.cta { text-align: left; }
.cta__inner { display: grid; grid-template-columns: 1.2fr auto; gap: var(--space-6); align-items: end; }
.cta__inner p { margin-top: var(--space-2); max-width: 34rem; }
.cta__actions { display: flex; flex-wrap: wrap; gap: var(--space-2); }
@media (max-width: 52rem) { .cta__inner { grid-template-columns: 1fr; gap: var(--space-4); } }

.site-footer { padding-block: var(--space-8) var(--space-4); border-top: var(--rule-width) solid rgba(248, 244, 233, 0.25); }
.site-footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: var(--space-6); }
.site-footer img.logo { width: 220px; }
.site-footer h2 { font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase; font-family: var(--font-sans); color: var(--color-surface-muted); margin-bottom: var(--space-2); }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.site-footer li a { display: inline-flex; align-items: center; min-height: 44px; }
.site-footer address { font-style: normal; display: grid; gap: var(--space-1); }
.site-footer__base {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-1) var(--space-3);
  margin-top: var(--space-6); padding-top: var(--space-3);
  border-top: var(--rule-width) solid rgba(248, 244, 233, 0.25);
  font-size: var(--text-sm); color: var(--color-surface-muted);
}
@media (max-width: 52rem) { .site-footer__grid { grid-template-columns: 1fr 1fr; } .site-footer__grid > :first-child { grid-column: 1 / -1; } }
@media (max-width: 34rem) { .site-footer__grid { grid-template-columns: 1fr; } }

/* ---------- Page header (inner pages) ---------- */
.page-head { padding-block: var(--space-8) var(--space-6); border-bottom: var(--rule-width) solid var(--color-rule); }
.page-head__inner { display: grid; gap: var(--space-2); justify-items: start; }
.page-head__inner > * { max-width: 44rem; }

/* ---------- Products ---------- */
.filters { display: flex; flex-wrap: wrap; gap: var(--space-1); margin-bottom: var(--space-4); }
.chip {
  min-height: 44px; padding: 0 var(--space-3);
  background: transparent; color: var(--color-brand);
  border: 1.5px solid var(--color-brand); border-radius: 999px;
  font: 600 var(--text-sm)/1 var(--font-sans); cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
}
.chip:hover { background: var(--color-surface-muted); }
.chip[aria-pressed="true"] { background: var(--color-brand); color: var(--color-white); }
.filters[hidden] { display: none; }
.result-count { font-size: var(--text-sm); margin-bottom: var(--space-3); }

.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(21rem, 1fr)); gap: var(--space-3); align-items: start; }
.product {
  background: var(--color-white); border: var(--rule-width) solid var(--color-rule);
  border-radius: var(--radius-md); padding: var(--space-3); display: grid; gap: var(--space-2);
}
.product[hidden] { display: none; }
.product__top { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); }
.product__top img { width: 24px; }
.product__class { color: var(--color-brand); }
.product h2, .product h3 { font-size: var(--text-xl); }
.product__desc { font-size: var(--text-sm); }
.product__meta {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2);
  margin: 0; padding-top: var(--space-2); border-top: var(--rule-width) solid var(--color-rule);
}
.product__meta dt { font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase; opacity: 0.75; }
.product__meta dd { margin: 2px 0 0; font-weight: 600; font-size: var(--text-sm); }
.product details { border-top: var(--rule-width) solid var(--color-rule); }
.product summary {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 48px; cursor: pointer; font-weight: 600; color: var(--color-brand); list-style: none;
}
.product summary::-webkit-details-marker { display: none; }
.product summary::after { content: "+"; font-size: var(--text-lg); line-height: 1; }
.product details[open] summary::after { content: "–"; }
.product details .spec { margin-bottom: var(--space-1); }
.product__cta { justify-self: start; }

.notice {
  display: flex; gap: var(--space-2); align-items: flex-start;
  margin-top: var(--space-6); padding: var(--space-2) var(--space-3);
  background: var(--color-surface-muted); border-radius: var(--radius-md); font-size: var(--text-sm);
}
.notice .marker { margin-top: 0.4em; background: var(--color-brand); }

/* ---------- About ---------- */
.principles { display: grid; grid-template-columns: 1fr 1fr; gap: 0 var(--space-8); list-style: none; margin: 0; padding: 0; }
.principles li { padding: var(--space-3) 0; border-top: var(--rule-width) solid var(--color-rule); display: grid; gap: var(--space-1); align-content: start; }
.principles h3 { font-size: var(--text-xl); }
.principles p { max-width: 30rem; }
@media (max-width: 52rem) { .principles { grid-template-columns: 1fr; } }
.promise { font-family: var(--font-serif); font-size: clamp(1.5rem, 3.4vw, var(--text-2xl)); line-height: 1.3; max-width: 30ch; }

.split { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: var(--space-8); }
@media (max-width: 52rem) { .split { grid-template-columns: 1fr; gap: var(--space-4); } }
.prose { display: grid; gap: var(--space-2); max-width: 38rem; }

/* ---------- Contact form ---------- */
.contact { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: var(--space-8); align-items: start; }
@media (max-width: 52rem) { .contact { grid-template-columns: 1fr; gap: var(--space-6); } }
.form { display: grid; gap: var(--space-3); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
@media (max-width: 34rem) { .form__row { grid-template-columns: 1fr; } }
.field { display: grid; gap: 6px; }
.field label { font-weight: 600; font-size: var(--text-sm); }
.field .hint { font-size: var(--text-sm); opacity: 0.8; margin-top: -2px; }
.field input, .field select, .field textarea {
  width: 100%; min-height: 48px; padding: 0.7rem var(--space-2);
  background: var(--color-white); color: var(--color-text);
  border: 1.5px solid rgba(37, 42, 39, 0.55); border-radius: var(--radius-sm);
  font: inherit;
}
.field textarea { min-height: 9rem; resize: vertical; }
.field input:hover, .field select:hover, .field textarea:hover { border-color: var(--color-brand); }
.field input:focus-visible, .field select:focus-visible, .field textarea:focus-visible { outline: 3px solid var(--color-brand); outline-offset: 2px; border-color: var(--color-brand); }
.field [aria-invalid="true"] { border-color: var(--color-status-critical); }
.field__error { display: none; align-items: center; gap: var(--space-1); font-size: var(--text-sm); font-weight: 600; }
.field__error::before { content: ""; flex: none; width: 10px; height: 10px; background: var(--color-status-critical); border-radius: 2px; }
.field.has-error .field__error { display: flex; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form__status { padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); font-weight: 600; display: none; }
.form__status.is-visible { display: flex; gap: var(--space-2); align-items: flex-start; }
.form__status--ok { background: var(--color-surface-muted); color: var(--color-brand); }
.form__status--error { background: var(--color-white); border: 1.5px solid var(--color-status-critical); color: var(--color-text); }
.form__status--error::before { content: ""; flex: none; width: 10px; height: 10px; margin-top: 0.45em; background: var(--color-status-critical); border-radius: 2px; }
.aside-block { display: grid; gap: var(--space-2); padding-top: var(--space-3); border-top: var(--rule-width) solid var(--color-brand); }
.aside-block + .aside-block { margin-top: var(--space-4); }
.aside-block dl { margin: 0; display: grid; gap: var(--space-2); }
.aside-block dt { font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase; opacity: 0.75; }
.aside-block dd { margin: 2px 0 0; font-weight: 600; }

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

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}