:root {
    --primary-blue: #1e3c72;
    --secondary-blue: #2a5298;
    --accent-blue: #4a90e2;
    --light-blue: #e7f3ff;
    --success-green: #28a745;
    --warning-orange: #ff9800;
    --danger-red: #f44336;
    --gray-light: #f8f9fa;
    --gray-medium: #6c757d;
    --gray-dark: #343a40;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #0c2461 0%, #1e3799 100%);
    color: #333;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1800px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.98);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(to right, var(--primary-blue), var(--secondary-blue));
    color: white;
    padding: 30px 40px;
    text-align: center;
}

h1 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 900px;
    margin: 0 auto;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    padding: 30px;
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.input-section {
    background: var(--gray-light);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.output-section {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.panel {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.panel:hover {
    transform: translateY(-5px);
}

h2 {
    color: var(--primary-blue);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--accent-blue);
    font-size: 1.8rem;
}

h3 {
    color: var(--secondary-blue);
    margin: 15px 0;
    font-size: 1.3rem;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--gray-dark);
}

textarea, input[type="file"], select, input[type="range"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s;
}

textarea:focus, input[type="file"]:focus, select:focus {
    border-color: var(--accent-blue);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

textarea {
    min-height: 250px;
    font-family: 'Consolas', 'Monaco', monospace;
    resize: vertical;
    line-height: 1.4;
}

.btn-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 25px;
}

button {
    padding: 14px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(to right, var(--primary-blue), var(--secondary-blue));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(to right, var(--secondary-blue), #3a68c2);
    transform: translateY(-3px);
    box-shadow: 0 7px 14px rgba(42, 82, 152, 0.3);
}

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

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-3px);
}

.btn-success {
    background: linear-gradient(to right, var(--success-green), #20c997);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(to right, #218838, #1e9e8a);
    transform: translateY(-3px);
}

.chart-container {
    position: relative;
    height: 400px;
    width: 100%;
    margin: 15px 0;
}

.contour-container {
    position: relative;
    height: 550px;
    width: 100%;
    margin: 15px 0;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.result-card {
    background: var(--gray-light);
    border-radius: 12px;
    padding: 20px;
    border-left: 5px solid var(--accent-blue);
    transition: all 0.3s ease;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.result-card.highlight {
    background: linear-gradient(135deg, #fff9c4 0%, #ffecb3 100%);
    border-left: 5px solid var(--warning-orange);
}

.result-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.result-value {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--secondary-blue);
    line-height: 1;
}

.result-unit {
    font-size: 1rem;
    color: var(--gray-medium);
    margin-top: 5px;
}

.depth-list {
    max-height: 300px;
    overflow-y: auto;
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 10px;
    margin-top: 10px;
}

.depth-item {
    padding: 10px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

.depth-item:hover {
    background-color: var(--light-blue);
}

.depth-item:last-child {
    border-bottom: none;
}

.antiklin-score {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 80px;
    text-align: center;
}

.score-low { background: #d4edda; color: #155724; }
.score-medium { background: #fff3cd; color: #856404; }
.score-high { background: #f8d7da; color: #721c24; }

.info-box {
    background: var(--light-blue);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    border-left: 5px solid var(--accent-blue);
}

footer {
    text-align: center;
    padding: 25px;
    color: var(--gray-medium);
    font-size: 0.9rem;
    border-top: 1px solid #eee;
    margin-top: 20px;
    background: var(--gray-light);
}

.tab-container {
    display: flex;
    border-bottom: 1px solid #ddd;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.tab {
    padding: 12px 25px;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    font-weight: 600;
    color: var(--gray-medium);
    transition: all 0.3s;
    white-space: nowrap;
}

.tab:hover {
    color: var(--primary-blue);
}

.tab.active {
    color: var(--primary-blue);
    border-bottom: 3px solid var(--primary-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.loading {
    display: none;
    text-align: center;
    padding: 40px;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.file-info {
    background: #e8f5e9;
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
    display: none;
}

.threshold-control {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin-top: 15px;
}

.color-scale {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    padding: 10px;
    background: linear-gradient(to right, #1e3c72, #2a5298, #4a90e2, #7cb5ec, #b3d9ff);
    border-radius: 8px;
    color: white;
    font-weight: 600;
}

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.control-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.control-group {
    background: white;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #ddd;
}

.data-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    margin: 20px 0;
}

.stat-item {
    text-align: center;
    padding: 15px;
    background: var(--gray-light);
    border-radius: 8px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-medium);
    margin-top: 5px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .main-content {
        padding: 15px;
        gap: 20px;
    }
    
    .panel {
        padding: 20px;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-container {
        overflow-x: auto;
        white-space: nowrap;
    }
}

.help-text {
    font-size: 0.9rem;
    color: var(--gray-medium);
    margin-top: 5px;
    font-style: italic;
}

.survey-points-info {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-blue);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-left: 10px;
}

.advanced-controls {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid #ddd;
}

.data-quality-meter {
    height: 10px;
    background: #e9ecef;
    border-radius: 5px;
    margin-top: 10px;
    overflow: hidden;
}

.quality-bar {
    height: 100%;
    background: linear-gradient(to right, #f44336, #ff9800, #4caf50);
    transition: width 0.5s ease;
}

.spacing-control {
    margin-top: 15px;
}

.survey-point-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.survey-point-item {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 10px;
    text-align: center;
}

.sp-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-blue);
}

.sp-label {
    font-size: 0.8rem;
    color: var(--gray-medium);
}