* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.upload-section, .media-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.upload-section h2, .media-section h2 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-form {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.file-input-wrapper {
    position: relative;
    flex: 1;
    min-width: 250px;
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-input-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px 20px;
    background: #f7fafc;
    border: 2px dashed #cbd5e0;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 60px;
}

.file-input-label:hover {
    border-color: #667eea;
    background: #edf2f7;
}

.file-input-label i {
    font-size: 1.5rem;
    color: #667eea;
}

.upload-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.upload-progress {
    margin-top: 20px;
    padding: 20px;
    background: #f7fafc;
    border-radius: 10px;
    border: 1px solid #e2e8f0;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
    animation: progress-animation 2s ease-in-out infinite;
}

@keyframes progress-animation {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.progress-text {
    color: #4a5568;
    font-weight: 500;
}

.media-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.control-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-btn:hover {
    background: #5a67d8;
    transform: translateY(-1px);
}

.filter-select {
    padding: 10px 15px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    background: white;
    font-size: 0.9rem;
    cursor: pointer;
}

.media-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.media-item {
    background: #f8fafc;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    cursor: pointer;
}

.media-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    border-color: #667eea;
}

.media-item.video {
    border-left: 4px solid #e53e3e;
}

.media-item.audio {
    border-left: 4px solid #38a169;
}

.media-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.media-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.media-icon.video {
    background: linear-gradient(135deg, #e53e3e, #c53030);
}

.media-icon.audio {
    background: linear-gradient(135deg, #38a169, #2f855a);
}

.media-info h3 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: #2d3748;
}

.media-info p {
    font-size: 0.9rem;
    color: #718096;
}

.media-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.action-btn {
    flex: 1;
    padding: 8px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.play-btn {
    background: #667eea;
    color: white;
}

.play-btn:hover {
    background: #5a67d8;
}

.delete-btn {
    background: #e53e3e;
    color: white;
}

.delete-btn:hover {
    background: #c53030;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #718096;
    font-size: 1.1rem;
}

.hidden {
    display: none !important;
}

/* モーダルスタイル */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    border-radius: 15px;
    max-width: 90%;
    max-height: 90%;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid #e2e8f0;
    background: #f8fafc;
}

.modal-header h3 {
    color: #2d3748;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #718096;
    padding: 5px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: #e2e8f0;
    color: #2d3748;
}

.modal-body {
    padding: 30px;
}

.media-player {
    width: 100%;
    max-width: 800px;
    border-radius: 10px;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .upload-section, .media-section {
        padding: 20px;
    }
    
    .upload-form {
        flex-direction: column;
        align-items: stretch;
    }
    
    .file-input-wrapper {
        min-width: auto;
    }
    
    .media-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .media-list {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 20px;
        max-width: calc(100% - 40px);
    }
}