.button {
  --button-width: 39.5rem;
  --button-height: 6.8125rem;
  --button-padding-block: 0rem;
  --button-padding-inline-start: 1.75rem;
  --button-padding-inline-end: 1.75rem;
  --button-gap: 4rem;
  --button-radius: 999rem;
  --button-border-width: 0rem;
  --button-color: #ffeaea;
  --button-font-size: 1rem;
  --button-font-weight: 600;
  --button-icon-size: 4.375rem;
  --button-icon-padding: 0.3125rem;
  --button-icon-stroke: 2.5;
  inline-size: var(--button-width);
  min-block-size: var(--button-height);
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: var(--button-gap);
  padding-block: var(--button-padding-block);
  padding-inline: var(--button-padding-inline-start) var(--button-padding-inline-end);
  border: var(--button-border-width) solid transparent;
  border-radius: var(--button-radius);
  color: var(--button-color);
  font-family: var(--font-sans);
  font-size: var(--button-font-size);
  font-weight: var(--button-font-weight);
  line-height: 1;
  letter-spacing: 0;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.button svg {
  flex: 0 0 auto;
  inline-size: var(--button-icon-size);
  block-size: var(--button-icon-size);
  padding: var(--button-icon-padding);
  border-radius: 50%;
  background: rgb(255 255 255 / 50%);
  stroke: currentColor;
  stroke-width: var(--button-icon-stroke);
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(219, 39, 31, 0.28);
}

.button--primary {
  --button-color: #fff;
  --button-primary-radius: 0rem;
  background: var(--color-red-dark);
}

.button--large {
  min-height: 72px;
  padding-inline: clamp(28px, 4vw, 54px);
  font-size: clamp(18px, 2vw, 37px);
}

.button--line {
  --button-color: #fff;
  background: var(--color-green);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(16, 23, 45, 0.16);
  box-shadow: 0 1px 12px rgba(16, 23, 45, 0.06);
  backdrop-filter: blur(10px);
  transform: translateY(0);
  transition: transform 260ms ease, box-shadow 260ms ease;
}

.site-header.is-header-hidden {
  transform: translateY(-105%);
}

.site-header.is-header-visible {
  box-shadow: 0 8px 24px rgba(16, 23, 45, 0.08);
}

.site-header__inner {
  width: min(100%, 1920px);
  height: 100%;
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 22px);
  display: flex;
  align-items: center;
}

.site-header__brand {
    color: #111;
    font-family: "Noto Sans JP",sans-serif;
    font-size: clamp(1.875rem, calc(1.500rem + 1.875vw), 3.750rem);
    font-weight: 700;
    line-height: 1;
    letter-spacing: -4%;
    transform: scaleX(0.7);
}