/* ================= ANIMATION: reveal-on-scroll + entrance ================= */
/* .is-visible được gắn bởi public/js/scroll-reveal.js khi phần tử .reveal xuất hiện trong viewport */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    transition-delay: var(--reveal-delay, 0ms);
    will-change: opacity, transform;
  }

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

  .about-test .about-stat-img-wrap img,
  .about-test .about-values-visual img,
  .about-test .about-mission-visual img,
  .about-test .about-test-ac-stats article img,
  .about-test .about-test-closing > img {
    transform: scale(1.035);
    transition: transform 1.1s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .about-test .is-visible .about-stat-img-wrap img,
  .about-test .about-values-col.is-visible .about-values-visual img,
  .about-test .about-mission-visual.is-visible img,
  .about-test .about-test-ac-stats article.is-visible img,
  .about-test .about-test-closing > img.is-visible {
    transform: scale(1);
  }

  /* Hero nằm ngay above-the-fold — chạy ngay khi tải trang, không chờ cuộn */
  @keyframes fade-up {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .hero-content > * {
    animation: fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
  }

  .hero-content > *:nth-child(1) { animation-delay: 0.05s; }
  .hero-content > *:nth-child(2) { animation-delay: 0.15s; }
  .hero-content > *:nth-child(3) { animation-delay: 0.25s; }
  .hero-content > *:nth-child(4) { animation-delay: 0.35s; }
  .hero-content > *:nth-child(5) { animation-delay: 0.45s; }
  .hero-content > *:nth-child(6) { animation-delay: 0.55s; }
}

/* Shared professional hover language — pointer devices only. */
@media (hover: hover) and (pointer: fine) and (prefers-reduced-motion: no-preference) {
  .btn,
  .project-brand-tab,
  .project-category-tab,
  .catalog-button,
  .catalog-brand-link,
  .case-link,
  .nav-item {
    transition: color .25s ease, background-color .25s ease, border-color .25s ease,
                box-shadow .25s ease, transform .25s cubic-bezier(.16, 1, .3, 1);
  }

  .btn:hover,
  .catalog-button:hover,
  .catalog-brand-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(30, 34, 43, .12);
  }

  .motion-card,
  .product-brand-visual,
  .project-tile,
  .news-card,
  .catalog-card,
  .case-card,
  .pt-case {
    transition: transform .38s cubic-bezier(.16, 1, .3, 1), box-shadow .38s ease;
  }

  .motion-card:hover,
  .product-brand-visual:hover,
  .project-tile:hover,
  .news-card:hover,
  .catalog-card:hover,
  .case-card:hover,
  .pt-case:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 38px rgba(30, 34, 43, .11);
  }

  .motion-card img,
  .product-brand-visual img,
  .project-tile img,
  .news-card img,
  .catalog-card img,
  .case-card img,
  .pt-case img {
    transition: transform .7s cubic-bezier(.16, 1, .3, 1), filter .35s ease;
  }

  .motion-card:hover img,
  .product-brand-visual:hover img,
  .project-tile:hover img,
  .news-card:hover img,
  .catalog-card:hover img,
  .case-card:hover img,
  .pt-case:hover img {
    transform: scale(1.035);
    filter: saturate(1.04) contrast(1.02);
  }

  .motion-image-frame {
    overflow: hidden;
  }

  .motion-image {
    transition: transform .7s cubic-bezier(.16, 1, .3, 1),
                filter .35s ease, opacity .35s ease;
    transform-origin: center;
    backface-visibility: hidden;
  }

  .motion-image-frame:hover > .motion-image,
  .motion-image:hover {
    transform: scale(1.025);
    filter: saturate(1.045) contrast(1.02);
  }

  main article.motion-card:not(.is-visible) {
    box-shadow: none;
  }

  .motion-image-only-card {
    transform: none;
    box-shadow: none;
  }

  .motion-image-only-card:hover {
    transform: none;
    box-shadow: none;
  }

  .motion-image-only-card img {
    transition: transform .4s cubic-bezier(.16, 1, .3, 1),
                box-shadow .4s ease, filter .35s ease;
  }

  .motion-image-only-card:hover img {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(30, 34, 43, .12);
    filter: saturate(1.035) contrast(1.015);
  }

  .case-link:hover,
  .project-category-tab:hover,
  .nav-item:hover {
    color: var(--color-terracotta);
  }

  input:not([type="checkbox"]):not([type="radio"]),
  select,
  textarea {
    transition: border-color .25s ease, box-shadow .25s ease, background-color .25s ease;
  }

  input:not([type="checkbox"]):not([type="radio"]):hover,
  select:hover,
  textarea:hover {
    border-color: var(--color-teal);
  }
}

/* Tôn trọng người dùng đã bật "giảm chuyển động" ở hệ điều hành/trình duyệt */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .hero-content > *,
  .motion-card,
  .motion-card img,
  .motion-image,
  .motion-image-frame,
  .btn {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}