:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #f8f5ff;
  --surface-strong: #f0e9ff;
  --text: #191b24;
  --muted: #5a5f7d;
  --primary: #6d28d9;
  --primary-soft: #e9ddff;
  --accent: #f472b6;
  --border: #e9e5f7;
  --shadow: 0 24px 80px rgba(109, 40, 217, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.page {
  width: min(1200px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
  padding: 4rem 0 5rem;
}

.hero__eyebrow,
.section__eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
}

.hero__title {
  margin: 0;
  font-size: clamp(2.8rem, 4vw, 4.5rem);
  line-height: 1;
  font-weight: 900;
}

.hero__emoji {
  display: inline-block;
}

.hero__subtitle {
  margin: 1.5rem 0 1rem;
  font-size: 1.3rem;
  line-height: 1.5;
  max-width: 46rem;
}

.hero__description {
  margin: 0 0 2rem;
  max-width: 42rem;
  color: var(--muted);
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  position: relative;
  overflow: hidden;
  isolation: isolate;

  transition:
    transform 0.2s ease,
    color 0.35s ease,
    background-color 0.35s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button::before {
  content: "";
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transition: transform 0.35s ease;
  z-index: -1;
}

.button--primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 14px 32px rgba(109, 40, 217, 0.14);
}

.button--primary::before {
  background: #fff;
  transform-origin: left;
}

.button--primary:hover::before,
.button--primary:focus-visible::before {
  transform: scaleX(1);
}

.button--primary:hover,
.button--primary:focus-visible {
  color: var(--primary);
}

.button--secondary {
  background: #fff;
  color: var(--primary);
  border-color: var(--primary);
}

.button--secondary::before {
  background: var(--primary);
  transform-origin: left;
}

.button--secondary:hover::before,
.button--secondary:focus-visible::before {
  transform: scaleX(1);
}

.button--secondary:hover,
.button--secondary:focus-visible {
  color: #fff;
}

.hero__visual {
  display: flex;
  justify-content: center;
  position: relative;
}

.visual-card {
  width: min(28rem, 100%);
  border-radius: 28px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
  border: 1px solid rgba(109, 40, 217, 0.08);
}

.visual-card--hero {
  position: relative;
  aspect-ratio: 4 / 3;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity 3s ease;
}

.hero-image--active {
  opacity: 1;
}

.visual-card__image {
  width: 100%;
  height: auto;
  display: block;
}

.section {
  padding: 4rem 0;
}

.section__header {
  margin-bottom: 2rem;
}

.section__title {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.1;
  font-weight: 800;
}

.section--intro {
  background: var(--surface-strong);
  border-radius: 32px;
  padding: 3rem;
}

.screen-grid,
.feature-grid,
.tech-grid {
  display: grid;
  gap: 1.5rem;
}

.screen-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.screen-card,
.feature-card,
.tech-card,
.notice-card {
  border-radius: 24px;
  background: #fff;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.06);
  border: 1px solid var(--border);
  overflow: hidden;
}

.screen-card {
  opacity: 0;
  transform: translateY(-24px);
  will-change: opacity, transform;
}

.screen-card.is-visible {
  animation: screen-card-drop 700ms cubic-bezier(0.22, 1.02, 0.42, 1) both;
}

.screen-grid .screen-card:nth-child(1).is-visible {
  animation-delay: 0ms;
}

.screen-grid .screen-card:nth-child(2).is-visible {
  animation-delay: 140ms;
}

.screen-grid .screen-card:nth-child(3).is-visible {
  animation-delay: 280ms;
}

@keyframes screen-card-drop {
  0% {
    opacity: 0;
    transform: translateY(-28px);
  }
  65% {
    opacity: 1;
    transform: translateY(6px);
  }
  85% {
    transform: translateY(-2px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .screen-card {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

.screen-card__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: #f8f5ff;
  padding: 1rem;
  cursor: zoom-in;
}

.screen-card__body {
  padding: 1.5rem;
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(6px);
  z-index: 9999;
  padding: 2rem;
}

.modal.is-open {
  display: flex;
}

.modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
}

.modal__content {
  position: relative;
  width: min(100%, 72rem);
  max-height: min(100%, 92vh);
  overflow: hidden;
  border-radius: 28px;
  background: #fff;
  box-shadow: 0 36px 80px rgba(15, 23, 42, 0.24);
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2.6rem;
  height: 2.6rem;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
  display: grid;
  place-items: center;
}

.modal__close:hover,
.modal__close:focus-visible {
  background: rgba(255, 255, 255, 1);
}

.modal__figure {
  margin: 0;
  display: grid;
}

.modal__image {
  width: 100%;
  height: auto;
  max-height: 80vh;
  object-fit: contain;
  background: #f8f5ff;
  display: block;
}

.modal__caption {
  margin: 0;
  padding: 1rem 1.5rem 1.5rem;
  color: var(--text);
  background: #fff;
  font-weight: 700;
}

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 3.5rem;
  height: 3.5rem;
  border: none;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 1.3rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 16px 40px rgba(109, 40, 217, 0.18);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 240ms ease, transform 240ms ease, visibility 240ms ease;
  z-index: 9999;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.9);
  outline-offset: 4px;
}

@media (max-width: 720px) {
  .back-to-top {
    right: 0.9rem;
    bottom: 0.9rem;
    width: 3rem;
    height: 3rem;
  }
}

.screen-card__title,
.feature-card__title {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  font-weight: 800;
}

.screen-card__text,
.feature-card__text,
.highlight,
.notice-card__text {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-card {
  padding: 2rem;
}

.feature-card__title {
  color: var(--text);
}

.negative-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}

.negative-list__item {
  padding: 1.25rem 1.5rem;
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
}

.tech-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tech-card {
  padding: 1.5rem;
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
  text-align: center;
}

.highlights {
  display: grid;
  gap: 1rem;
}

.highlight {
  padding: 1.5rem 1.75rem;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 600;
}

.notice-card {
  padding: 1.5rem 1.75rem;
  background: #fff5f8;
  border-color: #fde0ea;
}

.notice-card__text {
  margin: 0;
  color: #b83280;
  font-weight: 700;
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms cubic-bezier(.2,.9,.2,1), transform 600ms cubic-bezier(.2,.9,.2,1);
  will-change: opacity, transform;
}
.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .page {
    width: min(100%, calc(100% - 2rem));
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero__visual {
    order: -1;
  }

  .screen-grid,
  .feature-grid,
  .tech-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .hero {
    gap: 1.5rem;
    padding-top: 2.5rem;
  }

  .hero__subtitle {
    font-size: 1.15rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .screen-grid,
  .feature-grid,
  .tech-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 2.5rem 0;
  }

  .section--intro {
    padding: 2rem;
  }
}

.footer {
  padding: 2rem 0 3rem;
  text-align: center;
}

.footer__copyright {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}