:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --background-color: #f8fafc;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --success-color: #22c55e;
    --error-color: #ef4444;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    color: #64748b;
}

.upload-section {
    margin-bottom: 3rem;
}

.upload-container {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    background-color: white;
    transition: border-color 0.3s ease;
}

.upload-container:hover {
    border-color: var(--primary-color);
}

.file-input {
    display: none;
}

.upload-label {
    cursor: pointer;
    display: block;
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-content svg {
    color: var(--primary-color);
}

.upload-hint {
    font-size: 0.875rem;
    color: #64748b;
}

.progress-bar {
    margin-top: 1rem;
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

.files-section {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.files-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sort-controls {
    display: flex;
    gap: 0.5rem;
}

.sort-controls button {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sort-controls button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.files-table-container {
    overflow-x: auto;
}

.files-table {
    width: 100%;
    border-collapse: collapse;
}

.files-table th,
.files-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.files-table th {
    background-color: #f8fafc;
    font-weight: 600;
}

.files-table tr:hover {
    background-color: #f8fafc;
}

.download-button {
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.download-button:hover {
    background-color: var(--primary-hover);
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 2rem;
    border-radius: 4px;
    color: white;
    animation: slideIn 0.3s ease;
}

.toast.success {
    background-color: var(--success-color);
}

.toast.error {
    background-color: var(--error-color);
}

@keyframes slideIn {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .files-header {
        flex-direction: column;
        gap: 1rem;
    }

    .sort-controls {
        width: 100%;
    }

    .sort-controls button {
        flex: 1;
    }
}