:root {
    --primary-color: #2563eb;
    --hover-color: #1d4ed8;
    --border-radius: 12px;
    --button-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background: #f8fafc;
    display: flex;
    flex-direction: column;
}

.navbar {
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 0.5rem 1rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar-brand {
    font-weight: 600;
    color: var(--primary-color);
}

.nav-link {
    color: #4b5563;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
}

.nav-link:hover {
    background: #f0f6ff;
    color: var(--primary-color);
}

.nav-link.active {
    background: #f0f6ff;
    color: var(--primary-color);
}

.content-wrapper {
    margin-top: 56px;
    padding: 2rem;
    flex: 1;
}

.table {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    overflow: hidden;
}

.table thead th {
    background: #f8fafc;
    border-bottom: 2px solid #e9ecef;
    color: #4b5563;
    font-weight: 600;
    padding: 16px;
    text-align: center;
}

.table tbody td {
    padding: 16px;
    border-bottom: 1px solid #e9ecef;
    color: #4b5563;
    text-align: center;
    vertical-align: middle;
}

.table tbody tr:hover {
    background: #f8fafc;
}

.table .badge {
    padding: 6px 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.table .badge:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.upload-btn {
    background: var(--button-gradient);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    width: 100%;
    justify-content: center;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal-content {
    position: relative;
    background: white;
    width: 700px;
    max-width: 90%;
    margin: 100px auto;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.close-btn {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 24px;
    cursor: pointer;
    color: #666;
}

.drop-zone {
    border: 2px dashed #e9ecef;
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    margin: 20px 0;
    transition: all 0.3s ease;
}

.drop-zone.dragover {
    border-color: #2563eb;
    background: #f0f6ff;
}

.drop-zone i {
    font-size: 48px;
    color: #2563eb;
    margin-bottom: 16px;
}

.file-list {
    margin-top: 20px;
    max-height: 200px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 8px;
    margin-bottom: 8px;
    border: 1px solid #e9ecef;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-icon {
    color: #2563eb;
    font-size: 20px;
}

.file-name {
    font-size: 14px;
    color: #333;
}

.file-size {
    font-size: 12px;
    color: #666;
    white-space: nowrap;
}

.remove-file {
    color: #dc3545;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s;
}

.remove-file:hover {
    background: #ffebee;
}

.submit-btn {
    background: #2563eb;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    font-weight: 500;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background: #1d4ed8;
}