.speedtest-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
}

/* 시작 버튼 */
#startSpeedTest {
    width: 100%;
    padding: 16px 24px;
    background: #2196F3;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 30px;
}

#startSpeedTest:hover {
    background: #1976D2;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.2);
}

#startSpeedTest:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 속도 결과 그리드 */
.speed-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.speed-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: all 0.3s;
}

.speed-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.speed-item span:first-child {
    color: #666;
    font-size: 14px;
    font-weight: 500;
}

.speed-item span:last-child {
    color: #2196F3;
    font-size: 24px;
    font-weight: 600;
}

/* 로그 영역 */
.speed-test-log {
    margin-top: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    font-family: monospace;
    max-height: 200px;
    overflow-y: auto;
}

.speed-test-log div {
    padding: 8px 12px;
    border-left: 3px solid #2196F3;
    background: white;
    margin-bottom: 8px;
    border-radius: 0 4px 4px 0;
    font-size: 14px;
    animation: slideIn 0.3s ease-out;
}

.speed-test-log div:last-child {
    margin-bottom: 0;
}

/* 애니메이션 */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 스크롤바 스타일링 */
.speed-test-log::-webkit-scrollbar {
    width: 8px;
}

.speed-test-log::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.speed-test-log::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

.speed-test-log::-webkit-scrollbar-thumb:hover {
    background: #999;
}

/* 로딩 상태 표시 */
#startSpeedTest.loading {
    position: relative;
    overflow: hidden;
}

#startSpeedTest.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 200%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    animation: loading 1.5s infinite;
}

@keyframes loading {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(100%);
    }
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .speedtest-container {
        padding: 20px;
        margin: 0 15px;
    }
    
    .speed-results {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .speed-item span:last-child {
        font-size: 20px;
    }
}