/* ==========================================================================
   Component: Button
   ========================================================================== */

.c-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 48px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.04em;
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    color var(--transition-base),
    opacity var(--transition-base),
    transform var(--transition-base);
}

@media (min-width: 768px) {
  .c-btn {
    min-height: 52px;
    padding: 14px 32px;
    font-size: 15px;
  }
}

.c-btn__arrow {
  flex-shrink: 0;
}

.c-btn--outline {
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
  color: var(--color-primary-dark);
}

@media (hover: hover) {
  .c-btn--outline:hover {
    border-color: var(--color-primary);
    background-color: rgba(118, 199, 192, 0.06);
  }
}

.c-btn--primary {
  border: 1px solid var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-white);
}

.c-btn--primary .c-btn__arrow {
  color: var(--color-white);
}

@media (hover: hover) {
  .c-btn--primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
  }
}

.c-btn--ghost {
  border: 1px solid var(--color-border);
  background-color: transparent;
  color: var(--color-primary-dark);
}

@media (hover: hover) {
  .c-btn--ghost:hover {
    background-color: rgba(118, 199, 192, 0.08);
  }
}

.c-btn--lg {
  min-height: 56px;
  padding: 16px 48px;
  font-size: 15px;
  letter-spacing: 0.1em;
}

@media (min-width: 768px) {
  .c-btn--lg {
    min-height: 60px;
    padding: 18px 56px;
    font-size: 16px;
  }
}

/* FV CTA（サイト共通ボタン仕様） */
.c-btn--fv {
  justify-content: space-between;
  gap: 12px;
  min-height: 52px;
  padding: 14px 24px 14px 28px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.c-btn--fv .c-btn__label {
  flex: 0 1 auto;
  text-align: left;
}

.c-btn--fv .c-btn__arrow--dot {
  flex-shrink: 0;
  margin-left: auto;
}

@media (min-width: 768px) {
  .c-btn--fv {
    min-height: 56px;
    padding: 16px 28px 16px 32px;
    font-size: 16px;
  }
}

.c-btn--fv-outline {
  border: 1px solid #1f7f80;
  background-color: rgba(255, 255, 255, 0.92);
  color: #1f7f80;
}

@media (hover: hover) {
  .c-btn--fv-outline:hover {
    border-color: #176466;
    background-color: var(--color-white);
    color: #176466;
  }
}

.c-btn--fv-primary {
  border: none;
  background: linear-gradient(
    90deg,
    #4aada5 0%,
    #5fb5ad 35%,
    #76c7c0 70%,
    #8ed4cd 100%
  );
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(95, 181, 173, 0.35);
  width: 340px;
}

.c-btn--fv-primary .c-btn__arrow--dot {
  color: var(--color-white);
}

@media (hover: hover) {
  .c-btn--fv-primary:hover {
    filter: brightness(1.05);
    box-shadow: 0 6px 20px rgba(95, 181, 173, 0.45);
  }
}

/* FV CTA 小サイズ（サイドバー等） */
.c-btn--fv-sm {
  min-height: 44px;
  padding: 10px 16px 10px 20px;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.c-btn--fv-sm.c-btn--fv-primary {
  width: 100%;
  max-width: 100%;
  box-shadow: 0 3px 12px rgba(95, 181, 173, 0.3);
}

.c-btn--fv-sm .c-btn__arrow--dot {
  width: 24px;
  height: 7px;
}

@media (min-width: 768px) {
  .c-btn--fv-sm {
    min-height: 46px;
    padding: 11px 18px 11px 22px;
    font-size: 13px;
  }
}

@media (hover: hover) {
  .c-btn--fv-sm.c-btn--fv-primary:hover {
    box-shadow: 0 4px 14px rgba(95, 181, 173, 0.38);
  }
}

/* サービスカード内リンク（枠なし・ドット矢印のみ） */
.c-btn--dot-link {
  gap: 8px;
  min-height: 0;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-primary-dark);
}

@media (min-width: 768px) {
  .c-btn--dot-link {
    font-size: 15px;
  }
}

.c-btn .c-btn__arrow--dot {
  flex-shrink: 0;
  width: 28px;
  height: 8px;
  overflow: visible;
}

.c-btn .c-btn__arrow-dot {
  transform: translateX(0);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (hover: hover) {
  .c-btn:hover .c-btn__arrow-dot,
  .c-service-card__link:hover .c-btn__arrow-dot {
    transform: translateX(16px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .c-btn .c-btn__arrow-dot {
    transition: none;
  }

  .c-btn:hover .c-btn__arrow-dot,
  .c-service-card__link:hover .c-btn__arrow-dot {
    transform: none;
  }
}