/* ── Reset ──────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  background: #fff;
  overflow: hidden;
}

/* ── Scroll container ───────────────────────────────── */
.scroll-container {
  width: 100%;
  height: 100dvh;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.scroll-container::-webkit-scrollbar {
  display: none;
}

/* ── Section ────────────────────────────────────────── */
.section {
  position: relative;
  width: 100%;
  height: 100dvh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

/* ── Inner wrapper (max-width 500px) ────────────────── */
.section__inner {
  width: 100%;
  max-width: 500px;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  background: #000;
}

/* ── Main image ─────────────────────────────────────── */
.section__main {
  display: block;
  width: 100%;
  height: calc(100dvh - 103px);
  object-fit: contain;
  object-position: top center;
}

/* ── Fixed CTA Button ───────────────────────────────── */
.fixed-btn {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: min(353px, calc(100% - 40px));
  max-width: calc(500px - 40px);
  height: 71px;
  text-align: center;
  background: #FF6F1B;
  border: none;
  border-radius: 71px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(255, 255, 52, 0.35);
  transition: opacity 0.15s, transform 0.15s;
  text-decoration: none;
}
.fixed-btn:hover {
  opacity: 0.9;
}
.fixed-btn:active {
  transform: translateX(-50%) scale(0.97);
}
.fixed-btn span {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: clamp(16px, 14.592px + 0.376vw, 20px);
  color: #fff;
  white-space: nowrap;
  letter-spacing: 0.02em;
  pointer-events: none;
}

/* ── Swipe hint ─────────────────────────────────────── */
.swipe-hint {
  position: fixed;
  bottom: 104px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  z-index: 99;
  opacity: 1;
  transition: opacity 0.6s;
  pointer-events: none;
}
.swipe-hint.hidden {
  opacity: 0;
}
.swipe-hint__arrow {
  width: 24px;
  height: 24px;
  border-right: 2.5px solid rgba(0, 0, 0, 0.35);
  border-bottom: 2.5px solid rgba(0, 0, 0, 0.35);
  transform: rotate(45deg);
  animation: bounce 1.4s ease-in-out infinite;
}
.swipe-hint__text {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 11px;
  color: rgba(0, 0, 0, 0.4);
  letter-spacing: 0.08em;
}
@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50%       { transform: rotate(45deg) translateY(5px); }
}