:root {
    --primary: #0056b3;
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --text: #333333;
    --border: #dddddd;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.upload-section {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    gap: 15px;
    align-items: center;
    justify-content: center;
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s;
}

button:hover {
    background-color: #004494;
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.hidden {
    display: none !important;
}

#loading {
    text-align: center;
    margin-top: 30px;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border-left-color: var(--primary);
    animation: spin 1s linear infinite;
    margin: 10px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#results-container {
    margin-top: 30px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.actions {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 15px;
}

.review-content table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.review-content th, .review-content td {
    border: 1px solid var(--border);
    padding: 10px;
    text-align: left;
}

.review-content th {
    background-color: #f8f9fa;
}