/* Buttons & links -------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-out-confident),
              transform var(--duration-fast) var(--ease-out-confident);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-text-primary);
}

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

.btn--primary:active {
  background: var(--color-accent-pressed);
  transform: translateY(1px);
}

.icon-arrow {
  flex-shrink: 0;
}

/* Site navigation --------------------------------------------------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: var(--color-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast) var(--ease-out-confident);
}

.site-nav--scrolled {
  border-bottom-color: var(--color-border);
}

.site-nav__bar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.site-nav__logo {
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.site-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-right: calc(var(--space-2) * -1);
}

.site-nav__toggle-icon .bar {
  transform-box: fill-box;
  transform-origin: center;
  transition: transform var(--duration-nav) var(--ease-out-confident),
              opacity var(--duration-nav) var(--ease-out-confident);
}

.site-nav__toggle.is-open .bar-top {
  transform: translateY(5px) rotate(45deg);
}

.site-nav__toggle.is-open .bar-mid {
  opacity: 0;
}

.site-nav__toggle.is-open .bar-bottom {
  transform: translateY(-5px) rotate(-45deg);
}

.site-nav__panel:not([hidden]) {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-5) 0 var(--space-6);
}

.site-nav__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-inline: var(--container-padding);
}

.site-nav__links a {
  font-weight: 500;
  font-size: var(--text-md);
  transition: color var(--duration-fast) var(--ease-out-confident);
}

.site-nav__links a:hover,
.site-nav__links a[aria-current="page"] {
  color: var(--color-accent);
}

.site-nav__cta {
  margin-inline: var(--container-padding);
  justify-content: center;
}

@media (min-width: 768px) {
  .site-nav__toggle {
    display: none;
  }

  header.site-nav .site-nav__panel {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    flex: 1;
    gap: var(--space-6);
    padding: 0;
    border-bottom: none;
    background: none;
  }

  .site-nav__links {
    flex-direction: row;
    gap: var(--space-6);
    padding-inline: 0;
  }

  .site-nav__cta {
    margin-inline: 0;
  }
}

/* Hero ---------------------------------------------------------------- */

.hero {
  padding-block: var(--space-9);
}

@media (min-width: 1024px) {
  .hero {
    padding-block: var(--space-10);
  }
}

.hero__headline {
  margin-top: var(--space-4);
  font-size: var(--text-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: var(--leading-tight);
}

.hero__line {
  display: block;
}

.hero__line:nth-of-type(1) { transition-delay: 0ms; }
.hero__line:nth-of-type(2) { transition-delay: 90ms; }
.hero__line:nth-of-type(3) { transition-delay: 180ms; }

.hero__subcopy {
  margin-top: var(--space-6);
  max-width: 42ch;
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
}

.hero__actions {
  margin-top: var(--space-7);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-6);
}

.hero__secondary-cta {
  font-weight: 600;
  border-bottom: 1px solid var(--color-border-strong);
  padding-bottom: 2px;
  transition: border-color var(--duration-fast) var(--ease-out-confident),
              color var(--duration-fast) var(--ease-out-confident);
}

.hero__secondary-cta:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Product grid & cards -------------------------------------------------- */

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
}

.product-grid .product-card:nth-child(1) { transition-delay: 0ms; }
.product-grid .product-card:nth-child(2) { transition-delay: 90ms; }

.product-card {
  --card-accent: var(--color-accent);
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

@media (min-width: 768px) {
  .product-card {
    padding: var(--space-6);
  }
}

.product-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-accent);
  color: var(--card-accent);
  margin-bottom: var(--space-4);
}

.product-card__category {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.product-card__name {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.product-card__tagline {
  font-size: var(--text-md);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.product-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.product-card__footer {
  margin-top: auto;
  padding-top: var(--space-5);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}

.product-card__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-primary);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--card-accent);
  border-radius: var(--radius-full);
}

.product-card__status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--card-accent);
  flex-shrink: 0;
}

.product-card__badge {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* The Lab --------------------------------------------------------------- */

.lab__content {
  max-width: 640px;
}

.lab__content h2 {
  margin-top: var(--space-4);
}

.lab__content p {
  margin-top: var(--space-5);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.lab__content .lab__content-statement {
  font-size: var(--text-lg);
  color: var(--color-text-primary);
}

/* Process flow ------------------------------------------------------------ */

.process-flow {
  max-width: 640px;
  margin-inline: auto;
}

.process-step {
  display: flex;
  flex-direction: column;
}

.process-step__row {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-5);
}

.process-step__marker {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-accent);
}

.process-step__number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.125rem;
}

.process-step__content h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.process-step__content p {
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.process-step__connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 48px;
  color: var(--color-border-strong);
}

.process-step__connector-line {
  width: 1px;
  height: var(--space-6);
  background: var(--color-border);
}

@media (min-width: 768px) {
  .process-step__connector-line {
    height: var(--space-7);
  }
}

.process-step__chevron {
  margin-top: -2px;
}

/* Footer -------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-6);
  }
}

.site-footer__brand p:first-child {
  font-size: var(--text-lg);
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.site-footer__tagline {
  color: var(--color-text-secondary);
  max-width: 28ch;
}

.site-footer__col-heading {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-4);
}

.site-footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.site-footer__col a {
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out-confident);
}

.site-footer__col a:hover {
  color: var(--color-accent);
}

.site-footer__copyright {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* About page ------------------------------------------------------------ */

.about-hero {
  padding-top: var(--space-9);
  padding-bottom: var(--space-8);
}

.about-hero__headline {
  margin-top: var(--space-4);
  max-width: 20ch;
  font-size: var(--text-heading);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.about-hero__subcopy {
  margin-top: var(--space-5);
  max-width: 48ch;
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
}

.product-list {
  border-top: 1px solid var(--color-border);
}

.product-list li {
  border-bottom: 1px solid var(--color-border);
}

.product-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-5);
  transition: color var(--duration-fast) var(--ease-out-confident);
}

.product-list a:hover {
  color: var(--color-accent);
}

.product-list__name {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
}

.product-list a:hover .product-list__name {
  color: var(--color-accent);
}

.product-list__category {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-align: right;
}

/* Scroll reveal ------------------------------------------------------------ */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-base) var(--ease-out-confident),
              transform var(--duration-base) var(--ease-out-confident);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}