/* GPS Coordinate Calculator Styles */

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #e1e8ed;
    background-color: #1a1a1a;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 300;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

section {
    background: #2c2c2c;
    margin-bottom: 30px;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    border: 1px solid #404040;
}

h2 {
    color: #e1e8ed;
    margin-bottom: 25px;
    font-size: 1.8rem;
    font-weight: 400;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

h3 {
    color: #bdc3c7;
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 400;
}

/* Converter Section */
.converter-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.input-group, .output-group {
    display: flex;
    flex-direction: column;
}

label {
    font-weight: 500;
    margin-bottom: 8px;
    color: #e1e8ed;
}

textarea {
    width: 100%;
    min-height: 120px;
    padding: 12px;
    border: 2px solid #404040;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    transition: border-color 0.3s ease;
    background-color: #1a1a1a;
    color: #e1e8ed;
}

textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.result-display {
    background: #1a1a1a;
    border: 2px solid #404040;
    border-radius: 6px;
    padding: 15px;
    min-height: 120px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #e1e8ed;
}

.format-display {
    margin-bottom: 15px;
}

.format-display:last-child {
    margin-bottom: 0;
}

.coordinate-output {
    background: #2c2c2c;
    padding: 8px;
    border-radius: 4px;
    margin-top: 5px;
    word-break: break-all;
    color: #e1e8ed;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-small {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd8;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(108, 117, 125, 0.3);
}

.btn-small {
    padding: 8px 16px;
    font-size: 12px;
    margin: 0 5px;
}

/* Mode Toggle */
.mode-toggle {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    padding: 15px;
    background: #2c2c2c;
    border-radius: 6px;
    border: 1px solid #404040;
}

.toggle-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
}

.toggle-label input[type="radio"] {
    margin-right: 8px;
}

/* Input Modes */
.input-mode {
    margin-bottom: 25px;
}

.paste-container {
    display: flex;
    flex-direction: column;
}

.elevation-unit-group {
    margin: 15px 0;
    padding: 15px;
    background: #2c2c2c;
    border-radius: 6px;
    border: 1px solid #404040;
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.radio-group label {
    display: flex;
    align-items: center;
    margin-bottom: 0;
    font-weight: normal;
}

.radio-group input[type="radio"] {
    margin-right: 6px;
}

/* Coordinates Table */
.coordinates-table-container {
    border: 2px solid #404040;
    border-radius: 6px;
    overflow: hidden;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #2c2c2c;
    border-bottom: 2px solid #404040;
}

.table-controls {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.reference-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.reference-selector label {
    font-size: 14px;
    margin: 0;
    color: #e1e8ed;
}

.reference-selector select {
    padding: 6px 10px;
    border: 1px solid #404040;
    border-radius: 4px;
    background-color: #1a1a1a;
    color: #e1e8ed;
    font-size: 14px;
}

.reference-selector select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.table-buttons {
    display: flex;
    gap: 10px;
}

.coordinates-table {
    background: #1a1a1a;
}

.coordinate-row {
    display: grid;
    grid-template-columns: 80px 1fr 1fr 1fr 1fr 200px;
    gap: 15px;
    padding: 15px 20px;
    border-bottom: 1px solid #404040;
    align-items: center;
}

.coordinate-row:last-child {
    border-bottom: none;
}

.coordinate-row:nth-child(even) {
    background: #2c2c2c;
}

.coordinate-label {
    font-weight: 500;
    color: #e1e8ed;
}

.coordinate-input {
    padding: 8px 12px;
    border: 1px solid #404040;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    background-color: #1a1a1a;
    color: #e1e8ed;
}

.coordinate-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.elevation-unit-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.elevation-unit-row label {
    font-size: 12px;
    margin-bottom: 0;
    font-weight: normal;
    color: #e1e8ed;
}

.elevation-unit-row input[type="radio"] {
    margin-right: 4px;
}

/* Calculation Controls */
.calculation-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: #2c2c2c;
    border-radius: 6px;
    margin-bottom: 25px;
    border: 1px solid #404040;
}

.distance-options {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.unit-system-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: #2c2c2c;
    border-radius: 6px;
    border: 1px solid #404040;
}

.unit-system-selector label {
    font-size: 14px;
    margin: 0;
    color: #e1e8ed;
    font-weight: 500;
}

.unit-system-selector select {
    padding: 6px 10px;
    border: 1px solid #404040;
    border-radius: 4px;
    background-color: #1a1a1a;
    color: #e1e8ed;
    font-size: 14px;
    min-width: 200px;
}

.unit-system-selector select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.calculation-options {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.distance-options label {
    display: flex;
    align-items: center;
    margin-bottom: 0;
    font-weight: normal;
    color: #e1e8ed;
}

.distance-options input[type="checkbox"] {
    margin-right: 6px;
}

/* Results */
.results-container {
    border: 2px solid #404040;
    border-radius: 6px;
    overflow: hidden;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #2c2c2c;
    border-bottom: 2px solid #404040;
}

.distance-matrix {
    padding: 20px;
    overflow-x: auto;
    background: #1a1a1a;
}

.distance-table {
    width: 100%;
    border-collapse: collapse;
    font-family: 'Courier New', monospace;
    font-size: 13px;
}

.distance-table th,
.distance-table td {
    padding: 8px 12px;
    text-align: center;
    border: 1px solid #404040;
    color: #e1e8ed;
}

.distance-table th {
    background: #2c2c2c;
    font-weight: 500;
    color: #e1e8ed;
}

.distance-table tr:nth-child(even) {
    background: #2c2c2c;
}

.summary-stats {
    padding: 20px;
    background: #2c2c2c;
    border-top: 2px solid #404040;
}

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

.stat-item {
    background: #1a1a1a;
    padding: 15px;
    border-radius: 6px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    border: 1px solid #404040;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: #667eea;
    font-family: 'Courier New', monospace;
}

.stat-label {
    font-size: 0.9rem;
    color: #bdc3c7;
    margin-top: 5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .converter-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .coordinate-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .coordinate-row > * {
        grid-column: 1;
    }
    
    .calculation-controls {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }
    
    .distance-options {
        justify-content: center;
    }
    
    .mode-toggle {
        flex-direction: column;
        gap: 10px;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 10px;
    }
}

/* Detailed Calculations Styling */
.detailed-calculations {
    margin: 30px 0;
    padding: 20px;
    background: #2c2c2c;
    border-radius: 8px;
    border: 1px solid #404040;
}

.detailed-calculations h3 {
    color: #e1e8ed;
    margin-bottom: 25px;
    font-size: 1.5rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.calculation-breakdown {
    margin: 25px 0;
    padding: 20px;
    background: #1a1a1a;
    border-radius: 6px;
    border: 1px solid #404040;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.calculation-header h4 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.3rem;
    border-bottom: 1px solid #404040;
    padding-bottom: 8px;
}

.calculation-steps {
    margin: 15px 0;
}

.step {
    margin: 20px 0;
    padding: 15px;
    background: #2c2c2c;
    border-radius: 4px;
    border-left: 4px solid #667eea;
}

.step h5 {
    color: #e1e8ed;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.step p {
    margin: 8px 0;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.4;
    color: #e1e8ed;
}

.step strong {
    color: #e1e8ed;
    font-weight: 600;
}

.summary-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    font-size: 14px;
}

.summary-table th,
.summary-table td {
    padding: 10px 12px;
    text-align: left;
    border: 1px solid #404040;
    color: #e1e8ed;
}

.summary-table th {
    background: #667eea;
    color: white;
    font-weight: 500;
}

.summary-table tr:nth-child(even) {
    background: #2c2c2c;
}

.conclusion {
    margin: 20px 0;
    padding: 15px;
    background: #1a2e1a;
    border-radius: 4px;
    border-left: 4px solid #28a745;
}

.conclusion h5 {
    color: #28a745;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.conclusion p {
    margin: 5px 0;
    color: #28a745;
    font-weight: 500;
}

.surveying-standards {
    margin: 15px 0;
    padding: 15px;
    background: #1a1a1a;
    border-radius: 4px;
    border: 1px solid #404040;
}

.surveying-standards h6 {
    color: #667eea;
    margin-bottom: 10px;
    font-size: 1rem;
}

.surveying-standards ul {
    margin: 10px 0;
    padding-left: 20px;
}

.surveying-standards li {
    margin: 5px 0;
    color: #e1e8ed;
    font-size: 14px;
    line-height: 1.4;
}

.surveying-standards strong {
    color: #667eea;
}

/* Collapsible sections */
.collapsible-header {
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.collapsible-header:hover {
    color: #667eea;
}

.toggle-icon {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.collapsible.collapsed .collapsible-content {
    display: none;
}

.collapsible:not(.collapsed) .collapsible-content {
    display: block;
}

/* Standards help icon */
.standards-help {
    cursor: pointer;
    color: #667eea;
    font-size: 14px;
    margin-left: 5px;
    text-decoration: none;
}

.standards-help:hover {
    color: #5a6fd8;
    text-decoration: underline;
}

/* Standards popup */
.standards-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.popup-content {
    background: #2c2c2c;
    border-radius: 8px;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    border: 1px solid #404040;
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #404040;
    background: #1a1a1a;
    border-radius: 8px 8px 0 0;
}

.popup-header h3 {
    color: #e1e8ed;
    margin: 0;
}

.close-popup {
    background: none;
    border: none;
    color: #e1e8ed;
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.close-popup:hover {
    background: #404040;
}

.popup-body {
    padding: 20px;
}

.popup-body p {
    color: #e1e8ed;
    margin: 10px 0;
}

.popup-body a {
    color: #667eea;
    text-decoration: none;
}

.popup-body a:hover {
    text-decoration: underline;
}

.standards-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    font-size: 14px;
}

.standards-table th,
.standards-table td {
    padding: 10px 12px;
    text-align: left;
    border: 1px solid #404040;
    color: #e1e8ed;
}

.standards-table th {
    background: #667eea;
    color: white;
    font-weight: 500;
}

.standards-table tr:nth-child(even) {
    background: #1a1a1a;
}

/* Help Icons and Popups */
.help-icon {
    cursor: pointer;
    color: #667eea;
    font-size: 16px;
    margin-left: 8px;
    text-decoration: none;
    display: inline-block;
    width: 20px;
    height: 20px;
    text-align: center;
    line-height: 20px;
    border-radius: 50%;
    background: rgba(102, 126, 234, 0.1);
    transition: all 0.3s ease;
}

.help-icon:hover {
    color: #5a6fd8;
    background: rgba(102, 126, 234, 0.2);
    transform: scale(1.1);
}

.help-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.help-popup .popup-content {
    background: #2c2c2c;
    border-radius: 8px;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    border: 1px solid #404040;
}

.help-popup .popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #404040;
    background: #1a1a1a;
    border-radius: 8px 8px 0 0;
}

.help-popup .popup-header h3 {
    color: #e1e8ed;
    margin: 0;
    font-size: 1.3rem;
}

.help-popup .popup-body {
    padding: 20px;
}

.help-popup .popup-body p {
    color: #e1e8ed;
    margin: 10px 0;
    line-height: 1.6;
}

.help-popup .popup-body ul,
.help-popup .popup-body ol {
    color: #e1e8ed;
    margin: 10px 0;
    padding-left: 20px;
}

.help-popup .popup-body li {
    margin: 5px 0;
    line-height: 1.5;
}

.help-popup .popup-body code {
    background: #1a1a1a;
    padding: 2px 6px;
    border-radius: 3px;
    color: #667eea;
    font-family: 'Courier New', monospace;
    font-size: 13px;
}

.help-popup .popup-body strong {
    color: #667eea;
    font-weight: 600;
}

/* Condensed Calculations */
.condensed-calculations {
    margin: 30px 0;
    padding: 20px;
    background: #2c2c2c;
    border-radius: 8px;
    border: 1px solid #404040;
}

.condensed-calculations h3 {
    color: #e1e8ed;
    margin-bottom: 20px;
    font-size: 1.5rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.condensed-table {
    width: 100%;
    border-collapse: collapse;
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

.condensed-table th,
.condensed-table td {
    padding: 12px 15px;
    text-align: left;
    border: 1px solid #404040;
    color: #e1e8ed;
}

.condensed-table th {
    background: #667eea;
    color: white;
    font-weight: 500;
    text-align: center;
}

.condensed-table tr:nth-child(even) {
    background: #1a1a1a;
}

.condensed-table tr:hover {
    background: #333;
}

/* Loading and Error States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.error {
    color: #dc3545;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 10px;
    border-radius: 4px;
    margin: 10px 0;
}

.success {
    color: #155724;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    padding: 10px;
    border-radius: 4px;
    margin: 10px 0;
}