:root {
  --bg: #f6f4ee;
  --ink: #172023;
  --soft-ink: #4b5a61;
  --accent: #e95d2a;
  --accent-strong: #bd3f15;
  --mint: #88c8bf;
  --panel: rgba(255, 255, 255, 0.84);
  --line: rgba(23, 32, 35, 0.1);
  --shadow: 0 18px 42px rgba(24, 28, 30, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--bg);
  font-family: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}

.page-bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 8% 12%, rgba(233, 93, 42, 0.16), transparent 36%),
    radial-gradient(circle at 86% 4%, rgba(136, 200, 191, 0.28), transparent 32%),
    radial-gradient(circle at 70% 78%, rgba(255, 209, 88, 0.2), transparent 30%),
    linear-gradient(145deg, #f8f5eb 0%, #f3f6f4 58%, #fff7e4 100%);
  z-index: -2;
}

.site-header,
main,
.site-footer {
  width: min(1120px, calc(100% - 2.4rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.3rem 0 1.1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 0.5rem;
  background: var(--ink);
  color: #fff;
  font-family: "Archivo", sans-serif;
  font-weight: 800;
}

.brand-name {
  margin: 0;
  font-family: "Archivo", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-sub {
  margin: 0;
  font-size: 0.78rem;
  color: var(--soft-ink);
}

.header-link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 180ms ease, border-color 180ms ease;
}

.header-link:hover {
  color: var(--accent-strong);
  border-color: var(--accent-strong);
}

.hero {
  margin-top: 1.5rem;
  padding: clamp(1.2rem, 3vw, 2.4rem);
  border-radius: 1.7rem;
  background: linear-gradient(
      to right,
      rgba(255, 255, 255, 0.68),
      rgba(255, 255, 255, 0.52)
    ),
    linear-gradient(120deg, rgba(136, 200, 191, 0.34), rgba(233, 93, 42, 0.2));
  border: 1px solid rgba(255, 255, 255, 0.68);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

.hero-kicker {
  margin: 0;
  font-family: "Archivo", sans-serif;
  letter-spacing: 0.07em;
  font-size: 0.82rem;
  color: var(--accent-strong);
}

.hero h1 {
  margin: 0.55rem 0 0;
  line-height: 1.25;
  font-size: clamp(1.65rem, 4vw, 3.05rem);
}

.hero-subline {
  color: rgba(23, 32, 35, 0.75);
}

.hero-copy {
  margin: 1rem 0 0;
  max-width: 66ch;
  color: var(--soft-ink);
}

.hero-actions {
  margin-top: 1.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.store-notice {
  margin: 0.75rem 0 0;
  color: var(--soft-ink);
  font-size: 0.95rem;
}

.store-notice-highlight {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(233, 93, 42, 0.12);
  color: var(--accent-strong);
  font-weight: 700;
}

.hero-media {
  margin-top: 1.25rem;
  border-radius: 1.1rem;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
}

.hero-media img {
  display: block;
  width: 100%;
  height: auto;
}

.note {
  margin: 0.9rem 0 0;
  color: var(--soft-ink);
  font-size: 0.95rem;
}

.shot-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
}

.shot-item {
  margin: 0;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  border-radius: 0.95rem;
  padding: 0.55rem;
}

.shot-item img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.65rem;
}

.shot-item figcaption {
  margin-top: 0.5rem;
  color: var(--soft-ink);
  font-size: 0.86rem;
  line-height: 1.45;
}

.concept-layout {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 0.9rem;
}

.usecase-box {
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  background: linear-gradient(145deg, rgba(136, 200, 191, 0.18), rgba(233, 93, 42, 0.14));
  padding: 0.8rem;
}

.usecase-box ul {
  margin: 0.65rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.52rem;
}

.usecase-box li {
  border: 1px solid rgba(23, 32, 35, 0.12);
  border-radius: 0.85rem;
  background: rgba(255, 255, 255, 0.62);
  padding: 0.62rem 0.64rem;
  font-size: 0.92rem;
}

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.7rem 1.1rem;
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(95deg, var(--accent), #f07b35);
  box-shadow: 0 10px 18px rgba(233, 93, 42, 0.35);
}

.btn-secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--line);
}

.panel,
.timeline,
.cta {
  margin-top: 1.4rem;
  background: var(--panel);
  border-radius: 1.3rem;
  border: 1px solid var(--line);
  padding: clamp(1.05rem, 2.6vw, 2rem);
  box-shadow: var(--shadow);
}

.panel-head h2,
.timeline h2,
.cta h2 {
  margin: 0.1rem 0 0;
  font-size: clamp(1.2rem, 2.8vw, 2rem);
  line-height: 1.3;
}

.section-label {
  margin: 0;
  font-family: "Archivo", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  color: var(--accent-strong);
}

.feature-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.feature-item {
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  padding: 0.82rem 0.9rem;
  background: rgba(255, 255, 255, 0.7);
}

.feature-item h3 {
  margin: 0;
  font-size: 1rem;
}

.feature-item p {
  margin: 0.45rem 0 0;
  color: var(--soft-ink);
  font-size: 0.93rem;
}

.timeline ol {
  margin: 1.05rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.inline-media {
  margin-top: 0.95rem;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
}

.inline-media img {
  display: block;
  width: 100%;
  height: auto;
}

.inline-media figure {
  margin: 0;
}

.inline-media figcaption {
  padding: 0.55rem 0.9rem 0.7rem;
  font-size: 0.88rem;
  color: var(--muted, #666);
  text-align: center;
}

.inline-media.acsta-demo {
  display: flex;
  justify-content: center;
  background: rgba(255, 255, 255, 0.76);
}

.inline-media.acsta-demo figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 1rem;
  margin: 0;
}

.inline-media.acsta-demo img {
  width: auto;
  max-width: 100%;
  max-height: 480px;
  object-fit: contain;
  border-radius: 0.5rem;
}

.inline-media.acsta-demo figcaption {
  font-size: 0.88rem;
  color: var(--muted, #666);
  text-align: center;
}

.timeline li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 0.8rem;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  padding: 0.7rem 0.8rem;
  background: rgba(255, 255, 255, 0.72);
}

.step-number {
  display: inline-grid;
  place-items: center;
  width: 60px;
  height: 60px;
  border-radius: 0.8rem;
  background: linear-gradient(140deg, #223039, #3e4f59);
  color: #f9fffd;
  font-family: "Archivo", sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
}

.timeline h3 {
  margin: 0;
}

.timeline p {
  margin: 0.35rem 0 0;
  color: var(--soft-ink);
}

.scene-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.scene-item {
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  padding: 0.85rem 0.9rem;
  background: rgba(255, 255, 255, 0.7);
}

.scene-item h3 {
  margin: 0;
  font-size: 1rem;
}

.scene-item p {
  margin: 0.45rem 0 0;
  color: var(--soft-ink);
  font-size: 0.93rem;
}

.sharing-howto {
  position: relative;
  overflow: hidden;
}

.sharing-howto::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, rgba(233, 93, 42, 0.7), rgba(136, 200, 191, 0.7));
  pointer-events: none;
}

.sharing-steps {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.72rem;
}

.sharing-steps li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 0.8rem;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  padding: 0.7rem 0.8rem;
  background: rgba(255, 255, 255, 0.74);
}

.sharing-step-number {
  display: inline-grid;
  place-items: center;
  width: 60px;
  height: 60px;
  border-radius: 0.8rem;
  background: linear-gradient(140deg, #223039, #3e4f59);
  color: #f9fffd;
  font-family: "Archivo", sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
}

.sharing-steps h3 {
  margin: 0;
  font-size: 1rem;
}

.sharing-steps p {
  margin: 0.35rem 0 0;
  color: var(--soft-ink);
}

.sharing-result,
.sharing-highlight,
.sharing-closing,
.sharing-catch,
.sharing-signoff {
  margin: 0.9rem 0 0;
}

.sharing-result,
.sharing-highlight,
.sharing-closing {
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  padding: 0.72rem 0.85rem;
  background: rgba(255, 255, 255, 0.72);
  color: var(--soft-ink);
}

.sharing-highlight {
  background: linear-gradient(145deg, rgba(136, 200, 191, 0.2), rgba(255, 255, 255, 0.8));
}

.sharing-notes {
  margin-top: 0.9rem;
  display: grid;
  gap: 0.6rem;
}

.sharing-notes p {
  margin: 0;
  border-radius: 0.85rem;
  padding: 0.65rem 0.72rem;
  border: 1px solid rgba(23, 32, 35, 0.12);
  background: rgba(255, 255, 255, 0.62);
  color: var(--soft-ink);
  font-size: 0.92rem;
}

.sharing-catch {
  font-weight: 700;
  color: var(--ink);
}

.sharing-signoff {
  margin-top: 0.5rem;
  color: var(--soft-ink);
  font-size: 0.92rem;
}

.cta p {
  margin-top: 0.55rem;
  color: var(--soft-ink);
}

.site-footer {
  padding: 1.1rem 0 2.1rem;
  color: var(--soft-ink);
  font-size: 0.9rem;
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 500ms ease, transform 500ms ease;
}

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

@media (max-width: 920px) {
  .shot-grid,
  .feature-grid,
  .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .concept-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .site-header,
  main,
  .site-footer {
    width: min(1120px, calc(100% - 1.3rem));
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.55rem;
  }

  .feature-grid,
  .scene-grid,
  .shot-grid {
    grid-template-columns: 1fr;
  }

  .timeline li {
    grid-template-columns: 1fr;
  }

  .sharing-steps li {
    grid-template-columns: 1fr;
  }

  .step-number {
    width: 48px;
    height: 48px;
    border-radius: 0.65rem;
    font-size: 0.96rem;
  }

  .sharing-step-number {
    width: 48px;
    height: 48px;
    border-radius: 0.65rem;
    font-size: 0.96rem;
  }
}