/**
 * NEO Theme - ボタンコンポーネント
 */
.neo-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--neo-space-sm);
    padding: 12px 28px;
    font-size: var(--neo-font-size-sm);
    font-weight: var(--neo-font-weight-bold);
    border-radius: var(--neo-btn-radius);
    text-decoration: none;
    transition: transform var(--neo-transition-spring), box-shadow var(--neo-transition-base), background var(--neo-transition-base), color var(--neo-transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
    line-height: 1.4;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
}

.neo-btn--primary {
    background: var(--neo-color-primary-gradient);
    color: var(--neo-color-text-inverse);
    border: none;
    box-shadow: 0 4px 12px rgba(34, 113, 177, 0.2);
}

.neo-btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(34, 113, 177, 0.35);
    color: var(--neo-color-text-inverse);
}

.neo-btn--primary:active {
    transform: translateY(0);
}

.neo-btn--secondary {
    background: transparent;
    color: var(--neo-color-text);
    border-color: var(--neo-color-border);
}

.neo-btn--secondary:hover {
    border-color: var(--neo-color-primary);
    color: var(--neo-color-primary);
    background: var(--neo-color-primary-light);
    transform: translateY(-1px);
}

.neo-btn--ghost {
    background: transparent;
    color: var(--neo-color-primary);
    border-color: transparent;
    box-shadow: none;
}

.neo-btn--ghost:hover {
    background: var(--neo-color-primary-light);
    transform: translateY(-1px);
}

/* ボタンサイズのバリエーション */
.neo-btn--lg {
    padding: 16px 40px;
    font-size: var(--neo-font-size-base);
}

.neo-btn--sm {
    padding: 8px 20px;
    font-size: var(--neo-font-size-xs);
}

.neo-btn--full {
    width: 100%;
}

/* 波紋エフェクト (Ripple) 用の擬似要素 */
.neo-btn::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%) scale(0);
    border-radius: 50%;
    opacity: 0;
    transition: transform 0.4s ease-out, opacity 0.4s ease-out;
}

.neo-btn:active::after {
    transform: translate(-50%, -50%) scale(2);
    opacity: 1;
    transition: 0s;
}

.neo-btn + .neo-btn {
    margin-left: var(--neo-space-sm);
}
@media (max-width: 480px) {
    .neo-btn + .neo-btn {
        margin-left: 0;
        margin-top: var(--neo-space-sm);
    }
}