/* ボタン */
.btn {
    padding: 15px 30px;
    background:
            linear-gradient(145deg,
            rgba(139, 69, 19, 0.8) 0%,
            rgba(101, 67, 33, 0.9) 100%
            );
    color: #00ff41;
    border: 2px solid rgba(0, 255, 65, 0.5);
    border-radius: 12px;
    cursor: pointer;
    font-size: 16px;
    font-family: 'Courier Prime', monospace;
    font-weight: 700;
    margin: 0 15px;
    text-shadow: 0 0 5px #00ff41;
    box-shadow:
            0 6px 12px rgba(0, 0, 0, 0.4),
            0 0 15px rgba(0, 255, 65, 0.2);
    transition: all 0.2s ease;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(0, 255, 65, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow:
            0 8px 16px rgba(0, 0, 0, 0.6),
            0 0 25px rgba(0, 255, 65, 0.4);
    border-color: rgba(0, 255, 65, 0.8);
}

.btn:active {
    transform: translateY(0);
    box-shadow:
            0 4px 8px rgba(0, 0, 0, 0.6),
            0 0 15px rgba(0, 255, 65, 0.3);
}

/* ボタンの種類別スタイル */
.btn-primary {
    background:
            linear-gradient(145deg,
            rgba(0, 255, 65, 0.2) 0%,
            rgba(0, 200, 50, 0.3) 100%
            );
    border-color: rgba(0, 255, 65, 0.8);
}

.btn-secondary {
    background:
            linear-gradient(145deg,
            rgba(139, 69, 19, 0.6) 0%,
            rgba(101, 67, 33, 0.7) 100%
            );
    border-color: rgba(0, 255, 65, 0.4);
}

.btn-danger {
    background:
            linear-gradient(145deg,
            rgba(255, 69, 0, 0.2) 0%,
            rgba(255, 140, 0, 0.3) 100%
            );
    border-color: rgba(255, 165, 0, 0.6);
    color: #ffa500;
    text-shadow: 0 0 5px #ffa500;
}

.btn-danger:hover {
    border-color: rgba(255, 165, 0, 0.8);
    box-shadow:
            0 8px 16px rgba(0, 0, 0, 0.6),
            0 0 25px rgba(255, 165, 0, 0.4);
}

/* ボタンサイズバリエーション */
.btn-small {
    padding: 8px 16px;
    font-size: 12px;
    margin: 0 8px;
}

.btn-large {
    padding: 20px 40px;
    font-size: 18px;
    margin: 0 20px;
}

/* ボタンの無効状態 */
.btn:disabled,
.btn.disabled {
    background:
            linear-gradient(145deg,
            rgba(80, 80, 80, 0.5) 0%,
            rgba(60, 60, 60, 0.6) 100%
            );
    color: rgba(255, 255, 255, 0.4);
    border-color: rgba(255, 255, 255, 0.2);
    text-shadow: none;
    cursor: not-allowed;
    transform: none;
    box-shadow:
            0 2px 4px rgba(0, 0, 0, 0.4),
            0 0 5px rgba(255, 255, 255, 0.1);
}

.btn:disabled:hover,
.btn.disabled:hover {
    transform: none;
    box-shadow:
            0 2px 4px rgba(0, 0, 0, 0.4),
            0 0 5px rgba(255, 255, 255, 0.1);
}

.btn:disabled::before,
.btn.disabled::before {
    display: none;
}

/* アイコン付きボタン */
.btn-icon {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon .icon {
    font-size: 1.2em;
}

/* ボタングループ */
.btn-group {
    display: flex;
    gap: 0;
}

.btn-group .btn {
    margin: 0;
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: 12px;
    border-bottom-left-radius: 12px;
}

.btn-group .btn:last-child {
    border-top-right-radius: 12px;
    border-bottom-right-radius: 12px;
}

.btn-group .btn:not(:last-child) {
    border-right: none;
}

/* ボタンのレスポンシブ対応 */
@media (max-width: 768px) {
    .btn {
        padding: 12px 24px;
        font-size: 14px;
        margin: 0 10px;
    }

    .btn-small {
        padding: 6px 12px;
        font-size: 11px;
        margin: 0 5px;
    }

    .btn-large {
        padding: 16px 32px;
        font-size: 16px;
        margin: 0 12px;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 10px 20px;
        font-size: 13px;
        margin: 0 8px;
    }

    .btn-group {
        flex-direction: column;
        width: 100%;
    }

    .btn-group .btn {
        border-radius: 0;
        border-right: 2px solid rgba(0, 255, 65, 0.5);
    }

    .btn-group .btn:first-child {
        border-top-left-radius: 12px;
        border-top-right-radius: 12px;
        border-bottom-left-radius: 0;
    }

    .btn-group .btn:last-child {
        border-top-right-radius: 0;
        border-bottom-left-radius: 12px;
        border-bottom-right-radius: 12px;
    }

    .btn-group .btn:not(:last-child) {
        border-right: 2px solid rgba(0, 255, 65, 0.5);
        border-bottom: none;
    }
}

@media (max-width: 360px) {
    .btn {
        padding: 8px 16px;
        font-size: 12px;
        margin: 0 5px;
    }
}

/* タッチデバイス用の調整 */
@media (hover: none) and (pointer: coarse) {
    .btn {
        /* タッチしやすいサイズに調整 */
        min-height: 44px;
        padding: 12px 24px;
    }

    .btn:hover {
        /* ホバー効果を調整 */
        transform: none;
    }
}