/* ---------- ボタン ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-ja);
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition);
    line-height: 1.4;
    letter-spacing: 0.02em;
}

.btn--primary {
    background: var(--color-green);
    color: var(--color-white);
    border-color: var(--color-green);
}

.btn--primary:hover {
    background: var(--color-green-dark);
    border-color: var(--color-green-dark);
    color: var(--color-white);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 184, 86, 0.3);
}

.btn--primary:active {
    transform: scale(0.98) translateY(0);
    box-shadow: none;
}

.btn--outline {
    background: transparent;
    color: var(--color-navy);
    border-color: var(--color-navy);
}

.btn--outline:hover {
    background: var(--color-navy);
    color: var(--color-white);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(27, 42, 74, 0.25);
}

.btn--outline:active {
    transform: scale(0.98) translateY(0);
    box-shadow: none;
}

.btn--block {
    display: flex;
    width: 100%;
}

.btn--lg {
    padding: 1rem 2.5rem;
    font-size: 1rem;
}