/* ---------- Button（SP default） ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 380px;
  height: clamp(65px, calc(57.04px + 2.34vw), 75px);
  background: linear-gradient(
    92.46deg,
    #02C19B 28%,
    #FFFFB6 47%,
    var(--color-white) 50%,
    var(--color-white) 100%
  );
  background-size: 250% 100%;
  background-position: 0% 0%;
  color: var(--color-white);
  font-family: var(--font-mincho);
  font-weight: 900;
  font-size: clamp(18px, calc(14.84px + 0.93vw), 22px);
  line-height: 100%;
  letter-spacing: 0.05em;
  text-align: center;
  border: 2px solid var(--color-white);
  border-radius: 100px;
  box-shadow: 3px 3px 0px 0px var(--color-bg-main);
  cursor: pointer;
  text-decoration: none;
  overflow: hidden;
  z-index: 0;
  transition: background-position 0.5s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ボタン内側：テキスト + 矢印を1まとまりで中央配置 */
.btn__inner {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

/* 矢印（横線 + 斜め上線） */
.btn__inner::after {
  content: "";
  display: block;
  width: 18px;
  height: 0;
  border-top: 2px solid var(--color-white);
  margin-top: 2px;
  transition: border-color 0.3s ease;
}

.btn__inner::before {
  content: "";
  position: absolute;
  right: 0;
  top: calc(50% + 1px);
  width: 12px;
  height: 0;
  border-top: 2px solid var(--color-white);
  transform: rotate(40deg);
  transform-origin: right center;
  transition: border-color 0.3s ease;
}

/* ホバー */
.btn:hover {
  background-position: 100% 0%;
  color: #02C19B;
  border-color: #02C19B;
}

.btn:hover .btn__inner::after {
  border-top-color: #02C19B;
}

.btn:hover .btn__inner::before {
  border-top-color: #02C19B;
}

/* PC */
@media (min-width: 769px) {
  .btn {
    width: clamp(260px, calc(99.66px + 20.85vw), 500px);
    max-width: none;
    height: auto;
    aspect-ratio: 5 / 1;
    font-size: clamp(12px, -1.10px + 1.67vw, 31px);
    letter-spacing: 0.03em;
    border-width: 3px;
  }

  .btn__inner::after {
    width: clamp(16px, 5.31px + 1.39vw, 32px);
  }

  .btn__inner::before {
    width: clamp(8px, 2.62px + 0.70vw, 16px);
  }
}