/* Aqualyt — Site styles */

/* ---------- container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}
.container--narrow { max-width: var(--container-narrow); }

/* ---------- monospace markers ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-petrol);
}
.on-dark .eyebrow { color: var(--color-sand); }

.section-marker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.on-dark .section-marker { color: var(--text-on-dark-mute); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg-page) 88%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
.site-header.is-scrolled { border-bottom-color: var(--rule-soft); }

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--color-ink);
  letter-spacing: -0.018em;
}
.brand em {
  font-style: normal;
  font-weight: inherit;
  color: inherit;
  font-variation-settings: normal;
}
.brand__mark {
  flex-shrink: 0;
  display: block;
  transition: transform .4s ease;
}
.brand:hover .brand__mark { transform: rotate(-14deg); }
.brand__word { display: inline-block; line-height: 1; }

.nav {
  display: flex;
  gap: 2rem;
  font-size: 0.92rem;
  color: var(--text-mute);
}
.nav a:hover { color: var(--text-strong); }
@media (max-width: 720px) {
  .nav { display: none; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: 0.85rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.005em;
  border-radius: var(--radius-md);
  transition: all .25s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-deep);
  color: var(--bg-page);
  border: 1px solid var(--color-deep);
}
.btn--primary:hover {
  background: var(--color-petrol);
  border-color: var(--color-petrol);
  color: var(--bg-page);
  transform: translateY(-1px);
}
.btn--ghost {
  background: transparent;
  color: var(--text-strong);
  border: 1px solid var(--rule);
}
.btn--ghost:hover {
  border-color: var(--color-deep);
  color: var(--color-deep);
}
.on-dark .btn--ghost {
  color: var(--text-on-dark);
  border-color: var(--rule-on-dark);
}
.on-dark .btn--ghost:hover {
  color: var(--bg-page);
  border-color: var(--color-sand);
}
.btn .arrow {
  display: inline-block;
  transition: transform .25s ease;
}
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding-block: 7rem 8rem;
  overflow: hidden;
}
.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3rem;
}
@media (min-width: 960px) {
  .hero__inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}
.hero__eyebrow-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.2rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.hero__eyebrow-row .rule {
  flex: 1;
  height: 1px;
  background: var(--rule);
  max-width: 4rem;
}
.hero h1 {
  margin-bottom: 2.2rem;
  font-variation-settings: 'opsz' 144, 'SOFT' 30, 'wght' 400;
}
.hero__lead {
  max-width: 32rem;
  font-size: 1.18rem;
  line-height: 1.55;
  color: var(--text-body);
  margin-bottom: 2.2rem;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: .9rem;
  align-items: center;
}
.hero__meta {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  margin-top: 2.6rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule-soft);
  font-size: 0.85rem;
  color: var(--text-mute);
  max-width: 22rem;
}
.hero__meta strong { color: var(--text-strong); font-weight: 500; }

.hero__visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 30rem;
  margin-inline: auto;
  width: 100%;
}
.hero__visual svg { width: 100%; height: 100%; }

/* ripple animation */
.ripple-ring {
  transform-origin: center;
  animation: rippleOut 4.6s ease-out infinite;
  opacity: 0;
}
.ripple-ring--2 { animation-delay: 1.15s; }
.ripple-ring--3 { animation-delay: 2.30s; }
.ripple-ring--4 { animation-delay: 3.45s; }

@keyframes rippleOut {
  0%   { transform: scale(0.18); opacity: 0; }
  10%  { opacity: 0.55; }
  100% { transform: scale(1.0);  opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .ripple-ring { animation: none; opacity: 0.35; }
}

/* topographic backdrop */
.topo-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image: repeating-linear-gradient(
    180deg,
    transparent 0px,
    transparent 47px,
    color-mix(in srgb, var(--text-strong) 4%, transparent) 47px,
    color-mix(in srgb, var(--text-strong) 4%, transparent) 48px
  );
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 70% 40%, #000 30%, transparent 75%);
          mask-image: radial-gradient(ellipse 80% 70% at 70% 40%, #000 30%, transparent 75%);
}

/* ---------- generic section ---------- */
.section { padding-block: var(--section-py); }
.section--sm { padding-block: var(--section-py-sm); }

.section--dark {
  background: var(--bg-deep);
  color: var(--text-on-dark);
}
.section--dark h2 { color: var(--text-on-dark); }
.section--dark h2 em { color: var(--color-sand); }
.section--dark p { color: var(--text-on-dark-soft); }

.section--soft { background: var(--bg-page-alt); }
.section--sand { background: var(--bg-sand); }

.section__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
  align-items: end;
}
@media (min-width: 880px) {
  .section__head {
    grid-template-columns: 18ch minmax(0, 1fr);
    gap: 4rem;
  }
}
.section__lead {
  max-width: 38rem;
  font-size: 1.1rem;
  color: var(--text-mute);
}
.on-dark .section__lead { color: var(--text-on-dark-soft); }

/* ---------- §01 stats row ---------- */
.stat-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule-on-dark);
}
@media (min-width: 720px) {
  .stat-row { grid-template-columns: repeat(3, 1fr); }
}
.stat {
  padding: 2.2rem 1.5rem 2.2rem 0;
  border-bottom: 1px solid var(--rule-on-dark);
}
@media (min-width: 720px) {
  .stat {
    border-bottom: 0;
    border-right: 1px solid var(--rule-on-dark);
    padding: 0 2rem 0 0;
  }
  .stat:last-child { border-right: 0; padding-right: 0; }
  .stat:not(:first-child) { padding-left: 2rem; }
}
.stat__num {
  font-family: var(--font-display);
  font-size: clamp(3rem, 5vw, 4.4rem);
  font-weight: 300;
  line-height: 1;
  color: var(--color-sand);
  font-variation-settings: 'opsz' 144, 'SOFT' 80;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.stat__num sup {
  font-size: 0.5em;
  font-weight: 400;
  margin-left: 0.1em;
  color: var(--text-on-dark-mute);
  vertical-align: super;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-on-dark-mute);
  margin-bottom: .8rem;
}
.stat__text { font-size: 0.96rem; line-height: 1.55; }

/* ---------- §02 cycle layout ---------- */
.cycle {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4rem;
  align-items: center;
}
@media (min-width: 880px) {
  .cycle { grid-template-columns: 1fr 1fr; gap: 5rem; }
}
.cycle__diagram {
  width: 100%;
  max-width: 28rem;
  margin-inline: auto;
}
.cycle__points {
  display: grid;
  gap: 1.4rem;
  margin-top: 1.8rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule-soft);
}
.cycle__point { display: grid; grid-template-columns: 2rem 1fr; gap: 1rem; align-items: baseline; }
.cycle__point-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-aqua);
}
.cycle__point-text { font-size: 0.96rem; color: var(--text-body); }
.cycle__point-text strong { color: var(--text-strong); font-weight: 500; }

/* ---------- §03 pillars ---------- */
.pillars {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
}
@media (min-width: 880px) {
  .pillars { grid-template-columns: repeat(3, 1fr); }
}
.pillar {
  padding: 2.4rem 1.6rem 2.4rem 0;
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 880px) {
  .pillar {
    padding: 2.6rem 2.4rem 2.6rem 0;
    border-bottom: 0;
    border-right: 1px solid var(--rule);
  }
  .pillar:last-child { border-right: 0; padding-right: 0; }
  .pillar:not(:first-child) { padding-left: 2.4rem; }
}
.pillar__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--color-aqua);
  margin-bottom: 1.4rem;
}
.pillar h3 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: 1.9rem;
  margin-bottom: 1rem;
  font-variation-settings: 'opsz' 96, 'SOFT' 100;
  color: var(--color-deep);
}
.pillar__metric {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-petrol);
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
}
.pillar p { font-size: 0.96rem; line-height: 1.55; color: var(--text-body); }

/* ---------- §04 process ---------- */
.process {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  counter-reset: step;
}
@media (min-width: 880px) {
  .process { grid-template-columns: repeat(4, 1fr); }
}
.step {
  position: relative;
  padding: 3.5rem 1.5rem 1.5rem 0;
  border-top: 1px solid var(--rule-on-dark);
}
@media (min-width: 880px) {
  .step { padding: 3.5rem 1.5rem 0 0; border-right: 1px solid var(--rule-on-dark); }
  .step:last-child { border-right: 0; padding-right: 0; }
  .step:not(:first-child) { padding-left: 1.5rem; }
}
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 1.2rem; left: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-sand);
  letter-spacing: 0.16em;
}
@media (min-width: 880px) {
  .step:not(:first-child)::before { left: 1.5rem; }
}
.step h3 {
  color: var(--text-on-dark);
  font-style: italic;
  font-weight: 300;
  font-size: 1.55rem;
  font-variation-settings: 'opsz' 96, 'SOFT' 100;
  margin-bottom: .9rem;
}
.step p { color: var(--text-on-dark-soft); font-size: 0.94rem; line-height: 1.55; }

/* ---------- about ---------- */
.about {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3rem;
}
@media (min-width: 880px) {
  .about { grid-template-columns: 1.2fr 1fr; gap: 5rem; }
}
.about__copy p { font-size: 1.05rem; margin-bottom: 1.2rem; max-width: 36rem; }
.about__copy p:last-child { margin-bottom: 0; }

.facts {
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  background: var(--bg-elevated);
  font-size: 0.94rem;
}
.fact {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1.2rem;
  padding-block: .8rem;
  border-bottom: 1px solid var(--rule-soft);
}
.fact:last-child { border-bottom: 0; }
.fact__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
  padding-top: .15rem;
}
.fact__value { color: var(--text-strong); }
.fact__value a { border-bottom: 1px solid var(--rule); padding-bottom: 1px; }
.fact__value a:hover { border-color: var(--color-aqua); }

/* ---------- CTA ---------- */
.cta-section {
  text-align: center;
}
.cta-section h2 { margin-bottom: 1.5rem; max-width: 30ch; margin-inline: auto; }
.cta-section p { max-width: 36rem; margin-inline: auto; margin-bottom: 2.5rem; color: var(--text-body); }
.cta-section .btn { padding: 1rem 1.8rem; font-size: 1rem; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding-block: 3rem 2rem;
  font-size: 0.86rem;
  color: var(--text-mute);
  background: var(--bg-page);
}
.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  align-items: end;
}
@media (min-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr auto; }
}
.site-footer .brand { font-size: 1.05rem; }

/* ---------- reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .9s ease, transform .9s ease;
  transition-delay: var(--reveal-delay, 0s);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}