* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: float 20s linear infinite;
}

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-50px, -50px) rotate(360deg); }
}

.header-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.header-icon svg {
    width: 40px;
    height: 40px;
    stroke: white;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.header-desc {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Upload Zone */
.upload-zone {
    margin: 40px 30px;
    padding: 60px 20px;
    border: 3px dashed #c3cfe2;
    border-radius: 20px;
    text-align: center;
    background: #f8fafc;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.5s;
}

.upload-zone:hover::before {
    left: 100%;
}

.upload-zone.drag-over {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.05);
    transform: translateY(-2px);
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    color: #667eea;
}

.upload-icon svg {
    width: 100%;
    height: 100%;
}

.upload-text {
    font-size: 1.3rem;
    color: #4a5568;
    margin-bottom: 10px;
}

.upload-link {
    color: #667eea;
    font-weight: 600;
    cursor: pointer;
    text-decoration: underline;
    transition: color 0.2s;
}

.upload-link:hover {
    color: #764ba2;
}

.upload-hint {
    color: #718096;
    font-size: 0.95rem;
}

/* Progress Area */
.progress-area {
    margin: 0 30px 40px;
}

.progress-item {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.progress-item:hover {
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.file-icon {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    color: #667eea;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    color: #718096;
    font-size: 0.9rem;
}

.progress-bar {
    flex: 0 0 200px;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

/* File Section */
.file-section {
    margin: 0 30px 40px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e2e8f0;
}

.section-header h2 {
    font-size: 1.8rem;
    color: #2d3748;
    font-weight: 600;
}

.section-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.file-count {
    color: #718096;
    font-size: 0.95rem;
    background: #f7fafc;
    padding: 6px 12px;
    border-radius: 20px;
}

.btn-refresh {
    background: #667eea;
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-refresh:hover {
    background: #764ba2;
    transform: rotate(180deg);
}

.btn-refresh:active {
    transform: scale(0.95) rotate(180deg);
}

/* File List */
.file-list {
    background: #f8fafc;
    border-radius: 15px;
    min-height: 200px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: #a0aec0;
    text-align: center;
}

.empty-state svg {
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #e2e8f0;
    transition: background 0.2s;
}

.file-item:last-child {
    border-bottom: none;
}

.file-item:hover {
    background: #edf2f7;
}

.item-icon {
    width: 40px;
    height: 40px;
    margin-right: 15px;
    color: #667eea;
    flex-shrink: 0;
}

.item-info {
    flex: 1;
    min-width: 0;
}

.item-name {
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-meta {
    display: flex;
    gap: 20px;
    color: #718096;
    font-size: 0.9rem;
}

.item-actions {
    display: flex;
    gap: 10px;
}

.btn-action {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-download {
    background: #48bb78;
    color: white;
}

.btn-download:hover {
    background: #38a169;
    transform: translateY(-1px);
}

.btn-delete {
    background: #f56565;
    color: white;
}

.btn-delete:hover {
    background: #e53e3e;
    transform: translateY(-1px);
}

.btn-action svg {
    width: 16px;
    height: 16px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: #2d3748;
    color: white;
    padding: 15px 25px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    background: #48bb78;
}

.toast.error {
    background: #f56565;
}

.toast.info {
    background: #4299e1;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        border-radius: 15px;
    }
    
    .header {
        padding: 30px 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .upload-zone,
    .progress-area,
    .file-section {
        margin: 20px;
    }
    
    .progress-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .progress-bar {
        flex: 0 0 100%;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .item-meta {
        flex-direction: column;
        gap: 5px;
    }
    
    .item-actions {
        flex-wrap: wrap;
    }
}