:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --danger-color: #f72585;
    --success-color: #4cc9f0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f5f7fa;
    color: var(--dark-color);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 98%;
    margin: 0 auto;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e9ecef;
}

h1 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 10px;
}

a {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--gray-color);
    font-weight: 300;
}

.file-inputs {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    gap: 20px;
}

.file-input {
    flex: 1;
    padding: 20px;
    border-radius: var(--border-radius);
    background-color: var(--light-color);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.file-input:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.file-input h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-input h3 i {
    font-size: 1.2em;
}

.file-upload {
    position: relative;
    margin-bottom: 15px;
}

.file-upload input {
    width: 100%;
    height: 60px;
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
    cursor: pointer;
}

.file-upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 80px;
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: 10px;
    text-align: center;
    color: var(--primary-color);
    transition: var(--transition);
}

.file-upload-label:hover {
    background-color: rgba(67, 97, 238, 0.1);
}

.file-upload-label i {
    font-size: 1.5em;
    margin-bottom: 5px;
}

.file-info {
    font-size: 0.9em;
    color: var(--gray-color);
    padding: 10px;
    background-color: white;
    border-radius: var(--border-radius);
    margin-top: 10px;
    border: 1px solid #e9ecef;
}

.controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 30px 0;
}

button {
    padding: 12px 25px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    min-width: 120px;
    justify-content: center;
    align-items: center;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: var(--gray-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.sheet-selector {
    margin: 25px 0;
    text-align: center;
    display: none;
}

.sheet-selector label {
    font-weight: 500;
    margin-right: 10px;
    color: var(--primary-color);
}

select {
    padding: 10px 20px;
    font-size: 16px;
    border-radius: var(--border-radius);
    border: 1px solid #ced4da;
    background-color: white;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(67, 97, 238, 0.25);
}

.comparison-container {
    display: flex;
    gap: 25px;
    margin-top: 30px;
    display: none;
}

.file-display {
    flex: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.file-header {
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-header i {
    font-size: 1.2em;
}

.sync-scroll {
    overflow-y: scroll;
    height: 65vh;
    background-color: white;
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.9em;
}

th, td {
    border: 1px solid #dee2e6;
    padding: 12px;
    text-align: left;
    min-width: 100px;
}

th {
    background-color: #f1f3f5;
    position: sticky;
    top: 0;
    font-weight: 500;
    color: var(--dark-color);
}

.diff-cell {
    background-color: #fff0f3;
    color: var(--danger-color);
    font-weight: 500;
}

.match-cell {
    background-color: #f0f8ff;
    color: var(--accent-color);
}

.summary {
    margin: 30px 0;
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: none;
}

.summary h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-card {
    padding: 15px;
    border-radius: var(--border-radius);
    background-color: var(--light-color);
}

.stat-card h4 {
    color: var(--gray-color);
    font-weight: 500;
    margin-bottom: 5px;
    font-size: 0.9em;
}

.stat-card p {
    font-size: 1.2em;
    font-weight: 500;
}

.total-cells {
    border-left: 4px solid var(--primary-color);
}

.diff-cells {
    border-left: 4px solid var(--danger-color);
}

.match-cells {
    border-left: 4px solid var(--success-color);
}

.match-rate {
    border-left: 4px solid var(--accent-color);
}

.progress-container {
    margin-top: 15px;
    height: 8px;
    background-color: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
}

.annotation-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin: 15px 0;
}

.annotation-controls input {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    min-width: 400px;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--danger-color), var(--success-color));
    border-radius: 4px;
    transition: width 0.5s ease;
}

@media (max-width: 768px) {
    .file-inputs {
        flex-direction: column;
    }
    
    .comparison-container {
        flex-direction: column;
    }
    
    .stats {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .controls {
        flex-direction: column;
        align-items: center;
    }
    
    button {
        width: 100%;
        justify-content: center;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
}