@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
    /* Dark theme base */
    --header-bg: #0c1929;
    --header-bg-gradient: linear-gradient(135deg, #0c1929 0%, #162a44 100%);
    
    /* Accent - Cyan/Teal */
    --primary-color: #4dd0e1;
    --primary-hover: #26c6da;
    --primary-light: rgba(77, 208, 225, 0.1);
    --primary-glow: rgba(77, 208, 225, 0.15);
    
    /* Semantic colors */
    --success-color: #4ade80;
    --success-light: rgba(74, 222, 128, 0.1);
    --warning-color: #fbbf24;
    --danger-color: #f87171;
    
    /* Neutral palette */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-panel: #ffffff;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    font-weight: 400;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header - Dark theme */
.app-header {
    background: var(--header-bg-gradient);
    color: white;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.app-header h1 {
    font-size: 1.375rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0;
}

.app-header h1::before {
    content: none;
}

.app-header .descriptor {
    font-size: 0.6875rem;
    opacity: 0.7;
    font-weight: 400;
    letter-spacing: 0.01em;
    margin: 0.125rem 0 0 0;
    text-transform: lowercase;
}

.subtitle {
    font-size: 0.75rem;
    opacity: 0.6;
    font-weight: 400;
    letter-spacing: 0.01em;
}

.app-header .subtitle {
    margin-left: auto;
    color: var(--primary-color);
    opacity: 1;
    font-weight: 500;
    padding: 0.25rem 0.625rem;
    background: rgba(77, 208, 225, 0.1);
    border-radius: 4px;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Controls Panel */
.controls-panel {
    width: 360px;
    background: var(--bg-panel);
    padding: 1.25rem;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

.control-section {
    margin-bottom: 1.5rem;
}

.surface-control {
    margin-top: 1rem;
}

.surface-control label {
    display: block;
    font-weight: 500;
    font-size: 0.6875rem;
    margin-bottom: 0.375rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Advanced Options (collapsible) */
.advanced-options {
    margin-top: 1rem;
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
}

.advanced-options summary {
    cursor: pointer;
    font-weight: 500;
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding: 0.125rem 0;
    user-select: none;
}

.advanced-options summary:hover {
    color: var(--primary-color);
}

.advanced-options[open] summary {
    margin-bottom: 0.875rem;
    padding-bottom: 0.625rem;
    border-bottom: 1px solid var(--border-color);
}

.advanced-options .slider-control {
    margin-bottom: 1rem;
}

.advanced-options .slider-control:last-of-type {
    margin-bottom: 0.75rem;
}

.advanced-options .help-text {
    font-size: 0.6875rem;
    margin-bottom: 0.375rem;
    margin-top: 0.25rem;
}

/* GPX Track List */
.gpx-track-list .toggle-control {
    margin-bottom: 0.25rem;
}

.gpx-track-list .toggle-control label {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-muted);
}

/* Toggle Controls */
.toggle-control {
    margin-bottom: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.625rem;
}

.toggle-control label {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
}

.toggle-control input[type="checkbox"] {
    width: 0.875rem;
    height: 0.875rem;
    accent-color: var(--primary-color);
}

.toggle-control .preset-dropdown.small-select {
    width: auto;
    padding: 0.25rem 0.5rem;
    margin-bottom: 0;
    font-size: 0.6875rem;
}

.toggle-control .help-text {
    flex-basis: 100%;
    margin-bottom: 0;
}

.control-section h2 {
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

/* Preset Dropdown */
.preset-dropdown {
    width: 100%;
    padding: 0.5rem 0.625rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    background: white;
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.preset-dropdown:hover {
    border-color: var(--text-muted);
}

.preset-dropdown:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

/* Coordinates Input */
.coordinates {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.375rem;
    margin-bottom: 0.75rem;
}

.coordinates input {
    padding: 0.5rem 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    transition: border-color 0.15s ease;
}

.coordinates input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

/* Slider Controls */
.slider-control {
    margin-bottom: 1.25rem;
}

.slider-control label {
    display: block;
    font-weight: 500;
    font-size: 0.6875rem;
    margin-bottom: 0.375rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Large value display above slider */
.slider-value-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
    letter-spacing: -0.02em;
}

.slider-value-unit {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 0.125rem;
}

.slider-control input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    margin-bottom: 0.375rem;
    cursor: pointer;
    -webkit-appearance: none;
}

.slider-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid white;
    box-shadow: var(--shadow-md);
    transition: all 0.15s ease;
}

.slider-control input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.slider-control input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid white;
    box-shadow: var(--shadow-md);
    transition: all 0.15s ease;
}

.slider-control input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.slider-marks {
    display: flex;
    justify-content: space-between;
    font-size: 0.625rem;
    color: var(--text-muted);
}

/* Tolerance Badge */
.tolerance-badge {
    background: var(--primary-light);
    color: var(--primary-hover);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 500;
    font-size: 0.75rem;
    margin-top: 0.75rem;
    border: 1px solid rgba(77, 208, 225, 0.2);
}

/* Info Notice */
.info-notice {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--primary-color);
    padding: 0.625rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-top: 0.75rem;
    font-size: 0.6875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.info-notice strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Buttons */
.btn-primary, .btn-secondary {
    width: 100%;
    padding: 0.625rem 1rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-primary {
    background: var(--header-bg);
    color: white;
    margin-top: 1rem;
    box-shadow: var(--shadow-md);
    padding: 0.75rem 1rem;
}

.btn-primary:hover {
    background: #162a44;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow);
}

.btn-primary:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    transition: all 0.15s ease;
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
    color: var(--text-primary);
}

/* Loading State */
.loading {
    text-align: center;
    padding: 1.5rem;
}

.spinner {
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 0.75rem;
}

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

/* Results Panel */
.results-panel {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
}

.results-panel h2 {
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.results-summary {
    background: var(--bg-secondary);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
}

.results-summary strong {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.875rem;
}

.results-summary .metric-icon {
    display: inline-block;
    margin-right: 0.25rem;
    font-size: 0.75rem;
}

/* Clear Selection Button */
#clear-selection-btn {
    margin-bottom: 0.75rem;
    width: 100%;
}

/* Routes List */
.routes-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.route-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    cursor: pointer;
    transition: all 0.15s ease;
    box-shadow: var(--shadow-xs);
}

.route-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.route-card.hovered {
    border-color: var(--primary-color);
    background: var(--primary-light);
    box-shadow: var(--shadow-md);
    z-index: 10;
    position: relative;
}

.route-card.dimmed {
    opacity: 0.25;
    pointer-events: none;
    transition: opacity 0.15s ease;
}

.route-card.active {
    border-color: var(--primary-color);
    background: var(--primary-light);
    box-shadow: var(--shadow-md);
    z-index: 10;
    position: relative;
}

.route-card.hidden {
    display: none;
}

.route-card.valid {
    border-left: 3px solid var(--success-color);
}

.route-card.invalid {
    border-left: 3px solid var(--warning-color);
}

.route-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.375rem;
}

.route-number {
    font-weight: 600;
    font-size: 0.875rem;
}

.route-badge {
    font-size: 0.625rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    background: var(--primary-color);
    color: white;
}

.route-badge.valid {
    background: var(--success-color);
    color: white;
}

.route-badge.invalid {
    background: var(--warning-color);
    color: white;
}

.route-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.375rem;
    font-size: 0.75rem;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.stat-value {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.8125rem;
}

.stat-delta {
    font-size: 0.625rem;
    margin-left: 0.125rem;
}

.stat-delta.good {
    color: var(--success-color);
}

.stat-delta.warning {
    color: var(--warning-color);
}

/* Route Actions */
.route-actions {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-light);
}

.btn-export {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: center;
}

.btn-export:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-export:active {
    transform: translateY(1px);
}

/* Error Panel */
.error-panel {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.3);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    margin-top: 0.75rem;
    color: var(--danger-color);
    font-size: 0.75rem;
}

/* Map Panel */
.map-panel {
    flex: 1;
    position: relative;
}

#map {
    width: 100%;
    height: 100%;
}

/* Leaflet Layer Control (Basemap Switcher) */
.leaflet-control-layers {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.375rem;
    border: 1px solid var(--border-color);
}

.leaflet-control-layers-overlays label,
.leaflet-control-layers-base label {
    font-size: 0.75rem;
    font-weight: 500;
    margin: 0.125rem 0;
    cursor: pointer;
}

.leaflet-control-layers-overlays label:hover,
.leaflet-control-layers-base label:hover {
    color: var(--primary-color);
}

/* Map Legend */
.map-legend {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    background: white;
    padding: 0.625rem 0.75rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    border: 1px solid var(--border-color);
}

.map-legend h3 {
    font-size: 0.6875rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.6875rem;
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

.legend-marker {
    width: 16px;
    height: 2px;
    border-radius: 1px;
}

.legend-marker.valid {
    background: #8b5cf6;
}

.legend-marker.warning {
    background: var(--warning-color);
}

.legend-marker.start-route {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #10b981;
}

.legend-marker.finish-route {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: transparent;
    border: 2px solid #2563eb;
}

.legend-marker.coverage {
    width: 16px;
    height: 10px;
    border: 1px dashed #3b82f6;
    background: rgba(59, 130, 246, 0.08);
    border-radius: 2px;
}

/* Footer */
.app-footer {
    background: var(--header-bg);
    padding: 0.625rem 1.5rem;
    text-align: center;
    font-size: 0.6875rem;
    color: rgba(255, 255, 255, 0.5);
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .controls-panel {
        width: 100%;
        max-height: 50vh;
    }
    
    .map-panel {
        height: 50vh;
    }
}