/* The home page on phones: fewer words on each screen, bigger headings and more air. Every rule sits
   below 768px, except the ones that keep phone-only copy hidden, so tablets and desktops are untouched.
   The page is the one whose <main> starts with the hero. */

.copy-short,
.phone-only,
.rail-progress {
  display: none;
}

@media (max-width: 767px) {
  .copy-long {
    display: none;
  }

  .copy-short {
    display: inline;
  }

  .phone-only {
    display: block;
  }

  main:has(> .hero-stage) {
    --section-space: 4.5rem;
    --arrow-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h14M13 6l6 6-6 6'/%3E%3C/svg%3E");
  }

  main:has(> .hero-stage) :is(.section, .band) h2 {
    font-size: clamp(2rem, 9.4vw, 2.5rem);
    line-height: 1.08;
  }

  main:has(> .hero-stage) .section-head .lead {
    margin-top: var(--space-4);
  }

  /* On a phone the story runs services, agents, process, contact. The company profile is one tap away
     in the menu, so its section folds away here. */
  .home-about {
    display: none;
  }

  .home-about + .section {
    padding-top: 0;
  }

  /* AI agents: three short promises, each under a gold rule */
  .home-points {
    row-gap: var(--space-6);
  }

  .home-points > .item::before {
    content: '';
    display: block;
    width: 2rem;
    height: 2px;
    margin-bottom: var(--space-4);
    background: var(--color-accent);
  }

  .home-points h3 {
    font-size: 1.25rem;
  }

  /* How a project runs: one thread through the four steps */
  main:has(> .hero-stage) .steps {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 0;
  }

  main:has(> .hero-stage) .step {
    position: relative;
    grid-template-columns: 3.25rem minmax(0, 1fr);
    padding: 0 0 var(--space-6);
    border-top: 0;
  }

  main:has(> .hero-stage) .step:last-child {
    padding-bottom: 0;
  }

  main:has(> .hero-stage) .step:not(:last-child)::before {
    content: '';
    position: absolute;
    top: 2.75rem;
    bottom: 0.5rem;
    left: calc(1.125rem - 0.5px);
    width: 1px;
    background: var(--color-border-strong);
  }

  main:has(> .hero-stage) .step-index span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid var(--color-accent);
    border-radius: 50%;
    font-size: 0.8125rem;
    line-height: 1;
  }

  main:has(> .hero-stage) .step h3 {
    padding-top: 0.25rem;
    font-size: 1.25rem;
  }

  /* Results read as one row of three numbers */
  main:has(> .hero-stage) .stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: var(--space-4);
  }

  main:has(> .hero-stage) .stat {
    display: block;
    padding-block: var(--space-4) 0;
  }

  main:has(> .hero-stage) .stat-value {
    font-size: clamp(1.625rem, 7.6vw, 2.25rem);
  }

  main:has(> .hero-stage) .stat-label {
    margin-top: var(--space-2);
  }

  /* Long rows of cards become rails that scroll sideways. The next card peeks in and a gold line under
     the rail shows how far along it you are. */
  .rail {
    display: flex;
    gap: var(--space-3);
    margin-inline: calc(-1 * var(--gutter));
    padding: var(--space-1) var(--gutter);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: var(--gutter);
    scrollbar-width: none;
  }

  .rail::-webkit-scrollbar {
    display: none;
  }

  .rail:focus-visible {
    outline-offset: -2px;
  }

  .rail > :not(.sr-only) {
    flex: 0 0 min(86%, 21rem);
    scroll-snap-align: start;
  }

  .rail > :is(.item, .quote, .proof) {
    padding: var(--space-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-3xl);
    background: var(--color-surface);
  }

  /* The smaller card in the real-work rail is narrower, so the next card peeks in sooner */
  .rail > .proof-small {
    flex-basis: min(72%, 17rem);
  }

  .rail > .item:has(> .item-icon) {
    display: block;
  }

  .rail > .item > .item-icon {
    margin-bottom: var(--space-4);
  }

  .rail-progress {
    display: block;
    position: relative;
    width: 4.5rem;
    height: 2px;
    margin-top: var(--space-5);
    overflow: hidden;
    border-radius: 1px;
    background: var(--color-border-strong);
  }

  .rail-progress > span {
    position: absolute;
    inset: 0 auto 0 0;
    width: calc(var(--seen, 0.3) * 100%);
    border-radius: inherit;
    background: var(--color-accent);
    transform: translateX(calc(var(--at, 0) * (1 / var(--seen, 0.3) - 1) * 100%));
  }

  /* The second action in a band is a quiet text link, as in the hero */
  .link-quiet,
  .link-quiet:hover,
  .link-quiet:active {
    align-self: flex-start;
    justify-content: flex-start;
    width: auto;
    min-height: 44px;
    padding: 0;
    border-color: transparent;
    background: transparent;
  }

  .link-quiet:hover {
    text-decoration: underline;
    text-decoration-color: var(--color-accent);
    text-underline-offset: 0.3em;
  }

  .link-quiet::after {
    content: '';
    flex: none;
    width: 1rem;
    height: 1rem;
    background: var(--color-accent);
    -webkit-mask: var(--arrow-mask) center / contain no-repeat;
    mask: var(--arrow-mask) center / contain no-repeat;
    transition: transform var(--transition-base);
  }

  .link-quiet:hover::after {
    transform: translateX(3px);
  }
}

/* Scroll reveal: the classes only ever appear on phones that allow motion (useReveal) */
@media (max-width: 767px) and (prefers-reduced-motion: no-preference) {
  .reveal-pending {
    opacity: 0;
    transform: translateY(1.5rem);
  }

  .reveal-in {
    transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
  }
}

@media (max-width: 767px) and (prefers-reduced-motion: reduce) {
  .link-quiet::after {
    transition: none;
  }

  .link-quiet:hover::after {
    transform: none;
  }
}