/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 32px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.05em;
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(.4,.6,.2,1);
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--sea);
  color: var(--white);
}
.btn-primary:hover { background: var(--sea-deep); transform: translateY(-1px); box-shadow: var(--shadow-2); }
.btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.5);
  backdrop-filter: blur(6px);
  background: rgba(255,255,255,0.08);
}
.btn-ghost:hover { background: rgba(255,255,255,0.18); border-color: var(--white); }
.btn-ghost-dark {
  background: transparent;
  color: var(--sea);
  border-color: var(--sea);
}
.btn-ghost-dark:hover { background: var(--sea); color: var(--white); }

/* LINE button (公式緑) */
.btn-line {
  background: #06C755;
  color: #FFF;
  border-color: #06C755;
}
.btn-line:hover {
  background: #05B048;
  border-color: #05B048;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(6, 199, 85, 0.3);
}

/* LINE floating button (全ページ右下固定) */
.line-floating {
  position: fixed;
  right: 20px;
  bottom: 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  background: #06C755;
  color: #FFF;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(6, 199, 85, 0.35);
  z-index: 999;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(.4,.6,.2,1);
}
.line-floating:hover {
  background: #05B048;
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(6, 199, 85, 0.45);
  color: #FFF;
}
.line-floating svg { flex-shrink: 0; }
@media (max-width: 768px) {
  .line-floating {
    right: 16px;
    bottom: 16px;
    padding: 14px;
  }
  .line-floating span { display: none; }
}

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--sea);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 4px 0;
  border-bottom: 1px solid currentColor;
  transition: gap 0.3s;
}
.btn-link:hover { gap: 16px; }
.btn-link span { transition: transform 0.3s; }
.btn-link:hover span { transform: translateX(4px); }