/* =========================================================================
   FLAMESEED PRODUCTIONS — design system
   Dark, cinematic, elegant. Zero web fonts (system stack) for a light page.
   ========================================================================= */

/* ---- Tokens ---- */
:root {
  /* surfaces */
  --ink:        #0a0a0c;
  --ink-1:      #0e0e12;
  --ink-2:      #141419;
  --ink-3:      #1c1c23;
  --line:       rgba(244, 241, 234, 0.10);
  --line-strong:rgba(244, 241, 234, 0.22);

  /* text */
  --bone:       #f4f1ea;
  --bone-dim:   #a39e95;
  --bone-faint: #6f6b64;

  /* accents */
  /* brand red (from the Flameseed logo) replaces the former orange */
  --ember:      #e24b45;
  --ember-hot:  #ef6a63;
  --amber:      #f2877f;   /* light coral — keeps the red-family gradients alive */
  --seed:       #8fd6a0;

  /* effects */
  --glow:       rgba(226, 75, 69, 0.18);

  /* type */
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  /* scale */
  --shell:      min(1180px, 100% - 10vw);
  --radius:     2px;
  --ease:       cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  background: var(--ink);
  color: var(--bone);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
em { font-style: normal; color: var(--bone); }

/* ---- Accessibility helpers ---- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: 0; left: 50%; transform: translate(-50%, -120%);
  z-index: 200; background: var(--ember); color: #160a04;
  font-weight: 700; font-size: 0.9rem; padding: 0.7rem 1.4rem;
  border-radius: 0 0 var(--radius) var(--radius); transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

:focus-visible {
  outline: 2px solid var(--ember-hot);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---- Atmosphere: glow + grain ---- */
.atmosphere { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.atmosphere__glow {
  position: absolute; top: -20vh; left: 50%; transform: translateX(-50%);
  width: 120vw; height: 90vh;
  background:
    radial-gradient(closest-side, var(--glow), transparent 70%);
  filter: blur(40px);
}
.atmosphere__grain {
  position: absolute; inset: 0; opacity: 0.05; mix-blend-mode: screen;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- Layout shell ---- */
.shell { width: var(--shell); margin-inline: auto; position: relative; z-index: 1; }
.section { padding-block: clamp(5rem, 10vw, 9rem); position: relative; }
.section + .section { border-top: 1px solid var(--line); }

/* ---- Shared type ---- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.7rem;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--bone-dim); margin-bottom: 1.6rem;
}
.eyebrow__num { color: var(--ember); font-weight: 600; }
.eyebrow__dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--ember);
  box-shadow: 0 0 12px var(--ember);
}
.section__title {
  font-size: clamp(2.1rem, 1.5rem + 3.2vw, 3.8rem);
  line-height: 1.02; letter-spacing: -0.03em; font-weight: 800;
  max-width: 18ch;
}
.section__head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.lede {
  font-size: clamp(1.15rem, 1rem + 0.7vw, 1.45rem);
  line-height: 1.55; color: var(--bone); letter-spacing: -0.01em;
}
.lede + p, .studio__body p + p { margin-top: 1.3rem; }
.studio__body p, .sustain__intro p { color: var(--bone-dim); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--mono); font-size: 0.82rem; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase;
  padding: 1rem 1.6rem; border-radius: var(--radius);
  border: 1px solid transparent; transition: all 0.35s var(--ease);
}
.btn__arrow { transition: transform 0.35s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(5px); }
.btn--primary { background: var(--ember); color: #160a04; }
.btn--primary:hover { background: var(--ember-hot); box-shadow: 0 0 0 1px var(--ember-hot), 0 14px 40px -12px var(--ember); }
.btn--ghost { border-color: var(--line-strong); color: var(--bone); }
.btn--ghost:hover { border-color: var(--bone); background: rgba(244,241,234,0.04); }

.tag {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--bone-dim);
}

/* ===========================================================
   HEADER
   =========================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--ink) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem; height: 108px;
}
.brand { display: inline-flex; align-items: center; }
.brand__logo { width: auto; height: 68px; display: block; }
.brand__logo--footer { height: 84px; }

.nav { display: flex; align-items: center; }
.nav__menu { display: flex; gap: 2rem; }
.nav__menu a {
  font-size: 0.92rem; color: var(--bone-dim); position: relative;
  padding-block: 0.4rem; transition: color 0.25s var(--ease);
}
.nav__menu a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--ember); transition: width 0.3s var(--ease);
}
.nav__menu a:hover { color: var(--bone); }
.nav__menu a:hover::after { width: 100%; }
.nav__toggle { display: none; }

.lang { display: inline-flex; align-items: center; gap: 0.4rem; }
.lang__btn {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em;
  color: var(--bone-faint); padding: 0.3rem 0.2rem; transition: color 0.25s var(--ease);
}
.lang__btn.is-active { color: var(--bone); }
.lang__sep { color: var(--bone-faint); }

/* ===========================================================
   HERO
   =========================================================== */
.hero { padding-top: clamp(4rem, 9vw, 7rem); padding-bottom: clamp(3rem, 6vw, 5rem); }
.hero__inner { padding-block: clamp(2rem, 6vw, 5rem); }
.hero__title {
  font-size: clamp(3rem, 1.5rem + 9vw, 8.5rem);
  line-height: 0.92; letter-spacing: -0.045em; font-weight: 850;
  margin-block: 1.5rem 2rem; text-wrap: balance;
}
.hero__line { display: block; }
.hero__line--accent {
  background: linear-gradient(100deg, var(--ember) 0%, var(--amber) 60%, var(--ember-hot) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-style: italic;
}
.hero__lede { max-width: 46ch; font-size: clamp(1.15rem, 1rem + 0.8vw, 1.5rem);
  line-height: 1.5; color: var(--bone-dim); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.5rem; }

.hero__stats {
  display: flex; flex-wrap: wrap; gap: clamp(2rem, 6vw, 4.5rem);
  margin-top: clamp(3rem, 7vw, 5rem); padding-top: 2.2rem;
  border-top: 1px solid var(--line);
}
.stat dt {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--bone-faint); margin-bottom: 0.5rem;
}
.stat dd { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; }

.hero__scroll {
  position: absolute; right: 5vw; bottom: 2rem; z-index: 1;
  display: flex; flex-direction: column; align-items: center; gap: 0.8rem;
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.25em;
  text-transform: uppercase; color: var(--bone-faint);
}
.hero__scroll-line {
  width: 1px; height: 48px; background: linear-gradient(var(--ember), transparent);
  animation: scrollPulse 2.4s var(--ease) infinite;
}
@keyframes scrollPulse {
  0%, 100% { transform: scaleY(0.4); opacity: 0.4; transform-origin: top; }
  50% { transform: scaleY(1); opacity: 1; transform-origin: top; }
}

/* ===========================================================
   MARQUEE
   =========================================================== */
.marquee {
  overflow: hidden; border-block: 1px solid var(--line);
  padding-block: 1.4rem; background: var(--ink-1);
}
.marquee__track {
  display: flex; gap: 2.5rem; width: max-content;
  animation: marquee 32s linear infinite;
  font-family: var(--mono); font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--bone-dim);
}
.marquee__dot { color: var(--ember); }
@keyframes marquee { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) {
  .marquee__track { animation: none; }
}

/* ===========================================================
   STUDIO
   =========================================================== */
.studio__grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: clamp(2.5rem, 6vw, 6rem); }
.studio__intro { position: sticky; top: 110px; align-self: start; }

/* ===========================================================
   WORK
   =========================================================== */
.work__list { display: grid; gap: 1.2rem; }
.work-card article {
  display: grid; grid-template-columns: 220px 1fr; gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center; padding: 1.6rem; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--ink-1);
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease), transform 0.4s var(--ease);
}
.work-card article:hover {
  border-color: var(--line-strong); background: var(--ink-2); transform: translateY(-3px);
}
.work-card__media {
  aspect-ratio: 4 / 3; border-radius: var(--radius); position: relative; overflow: hidden;
  display: grid; place-items: center;
}
.work-card__media--1 { background: linear-gradient(145deg, #2a1206, #0c0c10 70%); }
.work-card__media--2 { background: linear-gradient(145deg, #07221a, #0c0c10 70%); }
.work-card__media--3 { background: linear-gradient(145deg, #1d1426, #0c0c10 70%); }
.work-card__media::after {
  content: ""; position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.12; mix-blend-mode: screen;
}
.work-card__index {
  font-family: var(--mono); font-size: 3.5rem; font-weight: 700;
  color: rgba(244,241,234,0.10); letter-spacing: -0.04em;
}
.work-card__meta { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.8rem; }
.work-card__status {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--seed);
  padding: 0.25rem 0.6rem; border: 1px solid color-mix(in srgb, var(--seed) 40%, transparent);
  border-radius: 100px;
}
.work-card__title {
  font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.4rem); font-weight: 800;
  letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 0.7rem;
}
.work-card__desc { color: var(--bone-dim); max-width: 52ch; }

/* ---- Featured project (Crisálida) ---- */
.feature-work {
  display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(1.5rem, 4vw, 3.5rem);
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--ink-1);
  overflow: hidden; transition: border-color 0.4s var(--ease);
}
.feature-work:hover { border-color: var(--line-strong); }
.feature-work__media {
  position: relative; min-height: 340px; display: grid; place-items: center;
  background: linear-gradient(160deg, #2a0c0c 0%, #1a0b22 55%, #0c0c10 100%);
  color: var(--amber); overflow: hidden;
}
.feature-work__media::after {
  content: ""; position: absolute; inset: 0; mix-blend-mode: screen; opacity: 0.12;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.feature-work__index {
  position: absolute; top: 1.2rem; left: 1.4rem; font-family: var(--mono);
  font-size: 1rem; letter-spacing: 0.12em; color: rgba(244,241,234,0.5);
}
.feature-work__glyph { position: relative; z-index: 1; filter: drop-shadow(0 0 24px rgba(242,135,127,0.35)); }
.feature-work__body { padding: clamp(1.6rem, 3vw, 2.6rem); display: flex; flex-direction: column; gap: 1rem; }
.feature-work__title {
  font-size: clamp(2rem, 1.4rem + 2.5vw, 3.2rem); font-weight: 850;
  letter-spacing: -0.03em; line-height: 1; margin-top: -0.2rem;
}
.feature-work__desc { color: var(--bone-dim); max-width: 56ch; }
.feature-work__specs {
  display: flex; flex-direction: column; gap: 0.5rem; margin-block: 0.3rem;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.04em; color: var(--bone-dim);
}
.feature-work__specs li { position: relative; padding-left: 1.2rem; }
.feature-work__specs li::before { content: "›"; position: absolute; left: 0; color: var(--ember); }
.feature-work__give {
  font-size: 0.92rem; color: var(--bone); padding: 1rem 1.2rem; border-radius: var(--radius);
  background: color-mix(in srgb, var(--seed) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--seed) 28%, transparent);
}
.feature-work__give strong { color: var(--seed); }
.feature-work__give-mark { color: var(--seed); margin-right: 0.4rem; }
.feature-work__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.4rem; margin-top: 0.5rem; }
.feature-work__price { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; color: var(--bone-faint); }
.work__next {
  margin-top: 1.6rem; font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.06em;
  color: var(--bone-faint); text-align: center;
}

/* ===========================================================
   ODS / SDGs
   =========================================================== */
.ods__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.2rem; }
.ods-card {
  --ods: var(--bone-faint);
  padding: clamp(1.4rem, 2.5vw, 2rem); border: 1px solid var(--line);
  border-top: 4px solid var(--ods); border-radius: var(--radius); background: var(--ink-1);
  display: flex; flex-direction: column; gap: 0.9rem; min-height: 100%;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.ods-card:hover { transform: translateY(-4px); }
.ods-badge {
  width: clamp(84px, 19vw, 104px); height: auto; border-radius: 4px; display: block;
  box-shadow: 0 8px 22px -10px rgba(0, 0, 0, 0.7);
}
.ods-card__name { font-size: 1.1rem; font-weight: 800; letter-spacing: -0.01em; line-height: 1.15; }
.ods-card p { font-size: 0.9rem; color: var(--bone-dim); line-height: 1.5; }
.ods__note {
  margin-top: 1.8rem; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--bone-faint); max-width: 60ch;
}
/* Official UN SDG colours */
.ods-card--3  { --ods: #4C9F38; }
.ods-card--8  { --ods: #A21942; }
.ods-card--10 { --ods: #DD1367; }
.ods-card--12 { --ods: #BF8B2E; }

/* ===========================================================
   VALUES / PILLARS
   =========================================================== */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.pillar {
  padding: clamp(1.6rem, 3vw, 2.4rem); border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--ink-1);
  display: flex; flex-direction: column; gap: 1rem; min-height: 100%;
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
}
.pillar:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.pillar__num {
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.12em;
  color: var(--bone-faint);
}
.pillar__title { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
.pillar p { color: var(--bone-dim); font-size: 0.98rem; }
.pillar { border-top: 3px solid var(--line-strong); }
.pillar--accent { border-top-color: var(--ember); }
.pillar--seed { border-top-color: var(--seed); }
.pillar:first-child { border-top-color: var(--amber); }

/* ===========================================================
   SUSTAINABILITY
   =========================================================== */
.sustain__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: center; }
.sustain__intro .btn { margin-top: 2rem; }
.sustain__metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.metric { background: var(--ink-1); padding: clamp(1.6rem, 3vw, 2.2rem); display: flex; flex-direction: column; gap: 0.8rem; }
.metric__value {
  font-size: clamp(1.8rem, 1.2rem + 2.5vw, 2.8rem); font-weight: 800;
  letter-spacing: -0.03em; line-height: 1;
  background: linear-gradient(120deg, var(--seed), #d6efda);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.metric__label { font-size: 0.88rem; color: var(--bone-dim); line-height: 1.45; }

/* ===========================================================
   A11Y BAND
   =========================================================== */
.a11y-band { background: var(--ink-1); text-align: center; }
.a11y-band__inner { max-width: 26ch; margin-inline: auto; display: flex; flex-direction: column; align-items: center; }
.a11y-band__inner .eyebrow { justify-content: center; }
.a11y-band__quote {
  font-size: clamp(1.7rem, 1.1rem + 3.2vw, 3.4rem); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.12; max-width: 18ch; text-wrap: balance;
}
.a11y-band__by { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--bone-faint); margin-top: 1.8rem; }

/* ===========================================================
   JOIN
   =========================================================== */
.join { text-align: center; }
.join__inner { display: flex; flex-direction: column; align-items: center; }
.join__inner .eyebrow { justify-content: center; }
.join__title {
  font-size: clamp(2.4rem, 1.4rem + 5vw, 5.5rem); font-weight: 850;
  letter-spacing: -0.04em; line-height: 0.98; margin-bottom: 1.5rem;
  max-width: 16ch; text-wrap: balance;
}
.join .lede { max-width: 50ch; color: var(--bone-dim); }
.join__actions { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; margin-top: 2.5rem; }

/* ===========================================================
   FOOTER
   =========================================================== */
.site-footer { border-top: 1px solid var(--line); padding-block: clamp(3rem, 6vw, 4.5rem); background: var(--ink-1); }
.site-footer__inner { display: grid; grid-template-columns: 1.2fr 1fr 1.2fr; gap: 2.5rem; align-items: start; }
.site-footer__tag { color: var(--bone-faint); font-size: 0.92rem; margin-top: 0.7rem; }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: 1.2rem 1.8rem; }
.site-footer__nav a { color: var(--bone-dim); font-size: 0.92rem; transition: color 0.25s var(--ease); }
.site-footer__nav a:hover { color: var(--bone); }
.site-footer__meta { display: flex; flex-direction: column; gap: 1rem; align-items: start; }
.site-footer__meta a { color: var(--ember); font-family: var(--mono); font-size: 0.85rem; letter-spacing: 0.04em; }
.site-footer__meta a:hover { text-decoration: underline; }
.site-footer__legal { display: flex; flex-direction: column; gap: 0.2rem; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--bone-faint); }

/* ===========================================================
   REVEAL ANIMATION
   =========================================================== */
[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; transition: none; }
  .hero__scroll-line { animation: none; }
}

/* ===========================================================
   RESPONSIVE
   =========================================================== */
@media (max-width: 900px) {
  :root { --shell: min(1180px, 100% - 8vw); }
  .studio__grid { grid-template-columns: 1fr; }
  .studio__intro { position: static; }
  .pillars { grid-template-columns: 1fr; }
  .sustain__grid { grid-template-columns: 1fr; }
  .work-card article { grid-template-columns: 1fr; }
  .work-card__media { max-width: 200px; }
  .feature-work { grid-template-columns: 1fr; }
  .feature-work__media { min-height: 220px; }
  .ods__grid { grid-template-columns: repeat(2, 1fr); }
  .site-footer__inner { grid-template-columns: 1fr; gap: 1.8rem; }
  .hero__scroll { display: none; }

  /* Mobile nav */
  .nav__toggle {
    display: inline-grid; place-items: center; width: 44px; height: 44px;
    border: 1px solid var(--line-strong); border-radius: var(--radius); z-index: 120; position: relative;
  }
  .nav__toggle-bars, .nav__toggle-bars::before, .nav__toggle-bars::after {
    content: ""; display: block; width: 18px; height: 2px; background: var(--bone);
    transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
  }
  .nav__toggle-bars::before { transform: translateY(-6px); }
  .nav__toggle-bars::after  { transform: translateY(4px); }
  .nav__toggle[aria-expanded="true"] .nav__toggle-bars { background: transparent; }
  .nav__toggle[aria-expanded="true"] .nav__toggle-bars::before { transform: rotate(45deg); }
  .nav__toggle[aria-expanded="true"] .nav__toggle-bars::after  { transform: rotate(-45deg); }

  /* Explicit viewport dimensions: an ancestor's backdrop-filter makes this
     fixed element resolve against the header, so % heights would collapse. */
  .nav__menu {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; height: 100dvh;
    flex-direction: column; justify-content: center;
    align-items: center; gap: 1.5rem; background: var(--ink);
    transform: translateY(-100%); transition: transform 0.45s var(--ease);
    z-index: 110;
  }
  .nav__menu:not(.is-open) { visibility: hidden; transition: transform 0.45s var(--ease), visibility 0s 0.45s; }
  .nav__menu.is-open { visibility: visible; transition: transform 0.45s var(--ease); }
  .nav__menu.is-open { transform: translateY(0); }
  .nav__menu a { font-size: 1.6rem; color: var(--bone); }
}

@media (max-width: 540px) {
  .sustain__metrics { grid-template-columns: 1fr; }
  .ods__grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 1.5rem 2.5rem; }
  .btn { width: 100%; justify-content: center; }
  .hero__actions, .join__actions { width: 100%; }
}

/* High-contrast preference: thicker borders, no faint text */
@media (prefers-contrast: more) {
  :root { --bone-dim: #d6d2ca; --bone-faint: #b4b0a8; --line: rgba(244,241,234,0.3); }
}