:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --background-color: #f8f9fa;
    --text-color: #2c3e50;
    --border-color: #dee2e6;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
    --danger-color: #e74c3c;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
}

.header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 2.5rem;
}

.subtitle {
    color: var(--secondary-color);
    font-size: 1.1rem;
    margin: 0;
}

.upload-section {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 40px;
}

.upload-form {
    display: flex;
    gap: 15px;
    align-items: flex-end;
}

.form-group {
    flex: 1;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.table {
    width: 100%;
    margin-bottom: 1.5rem;
    background-color: white;
    border-collapse: separate;
    border-spacing: 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.table th,
.table td {
    padding: 8px 12px;
    vertical-align: middle;
    border: 1px solid var(--border-color);
    font-size: 14px;
    line-height: 1.4;
}

.table thead th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 13px;
    letter-spacing: 0.5px;
    border-bottom: none;
    padding: 10px 12px;
}

.table tbody tr:hover {
    background-color: rgba(44, 62, 80, 0.02);
}

.table-bordered {
    border: 1px solid var(--border-color);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02);
}

.observation-summary {
    background-color: var(--background-color);
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

h4 {
    color: var(--primary-color);
    margin-top: 25px;
    margin-bottom: 15px;
    font-weight: 600;
}

h5 {
    color: var(--secondary-color);
    margin-top: 20px;
    margin-bottom: 10px;
    font-weight: 500;
}

.btn {
    display: inline-block;
    padding: 8px 16px;
    margin-bottom: 0;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    border: none;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-1px);
}

.form-control {
    display: block;
    width: 100%;
    height: 38px;
    padding: 8px 12px;
    font-size: 14px;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    border: 1px solid #ced4da;
    border-radius: 4px;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(44, 62, 80, 0.25);
}

/* 탭 스타일 */
.tabs {
    margin: 20px 0;
}

.tab-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.tab-button {
    padding: 10px 20px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 5px 5px 0 0;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab-button:hover {
    background-color: var(--accent-color);
    color: white;
}

.tab-button.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.tab-content {
    display: none;
    padding: 20px;
    background-color: white;
    border-radius: 0 5px 5px 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.tab-content.active {
    display: block;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .upload-form {
        flex-direction: column;
        align-items: stretch;
    }

    .tab-buttons {
        flex-wrap: wrap;
    }

    .tab-button {
        flex: 1;
        text-align: center;
    }

    .table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}