:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --secondary-color: #FF9800;
    --success-color: #4CAF50;
    --danger-color: #F44336;
    --dark-bg: #1a1a1a;
    --card-bg: #ffffff;
    --text-primary: #333;
    --text-secondary: #666;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s;
}

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

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

/* Container */
.container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s;
}

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

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    text-align: center;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.section-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.section-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Typography */
h2 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

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

.btn-secondary:hover {
    background: #F57C00;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.cta-section {
    text-align: center;
    margin: 3rem 0;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

/* Forms */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.help-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.info-message {
    background: #E3F2FD;
    padding: 1rem;
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
    margin-top: 1rem;
}

.total-info {
    background: #E8F5E9;
    padding: 1rem;
    border-radius: 6px;
    margin-top: 1rem;
    text-align: center;
    font-size: 1.1rem;
}

/* Map */
#map {
    border: 2px solid var(--border-color);
    z-index: 1;
}

.location-info {
    background: #E8F5E9;
    padding: 1.5rem;
    border-radius: 6px;
    margin-top: 1.5rem;
}

.location-info p {
    margin: 0.5rem 0;
}

#tmyStatus {
    margin-left: 1rem;
    font-weight: 600;
}

#tmyStatus.success {
    color: var(--success-color);
}

#tmyStatus.error {
    color: var(--danger-color);
}

/* Progress */
.progress-section {
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    margin-top: 2rem;
}

.spinner {
    border: 4px solid rgba(33, 150, 243, 0.1);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Empty state */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--card-bg);
    border-radius: 12px;
}

.empty-state p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Results */
.results-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    margin: 0.5rem 0;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.plot-container {
    margin: 2rem 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.plot-container iframe {
    width: 100%;
    height: 600px;
    border: none;
}

.download-section {
    text-align: center;
    padding: 2rem;
    background: #f5f5f5;
    border-radius: 8px;
    margin-top: 2rem;
}

/* Comparison */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.comparison-table tr:hover {
    background: #f5f5f5;
}

.better {
    color: var(--success-color);
    font-weight: 600;
}

.worse {
    color: var(--danger-color);
    font-weight: 600;
}

/* Footer */
.footer {
    background: var(--card-bg);
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Alert messages */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 6px;
    margin: 1rem 0;
}

.alert-success {
    background: #E8F5E9;
    color: #2E7D32;
    border-left: 4px solid var(--success-color);
}

.alert-error {
    background: #FFEBEE;
    color: #C62828;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background: #FFF3E0;
    color: #E65100;
    border-left: 4px solid var(--secondary-color);
}

.alert-info {
    background: #E3F2FD;
    color: #1565C0;
    border-left: 4px solid var(--primary-color);
}