/**
 * Earth Status Dashboard - Global Styles
 * 
 * A minimalist, monochrome design system for environmental data visualization.
 * Uses JetBrains Mono font for a technical, data-focused aesthetic.
 * 
 * @author Earth Status Team
 * @version 1.0.0
 */

/* ============================================================================
   CSS Custom Properties (Variables)
   ========================================================================= */

:root {
    /* Background Colors */
    --color-bg-primary: #000;
    --color-bg-secondary: #1a1a1a;
    --color-bg-overlay: rgba(255, 255, 255, 0.05);
    
    /* Text Colors */
    --color-text-primary: #fff;
    --color-text-secondary: #ccc;
    --color-text-tertiary: #999;
    
    /* Border Colors */
    --color-border-primary: #fff;
    --color-border-secondary: #333;
    
    /* Button Colors */
    --color-button-bg: #fff;
    --color-button-text: #000;
    --color-button-hover-bg: #000;
    --color-button-hover-text: #fff;
    
    /* Component Colors */
    --color-dropdown-bg: #1a1a1a;
    --color-dropdown-hover: #2a2a2a;
    --color-loading-spinner: #fff;
    
    /* Air Quality Index (AQI) Colors - EPA Standard */
    --color-aqi-good: #00e400;
    --color-aqi-moderate: #ffff00;
    --color-aqi-unhealthy-sensitive: #ff7e00;
    --color-aqi-unhealthy: #ff0000;
    --color-aqi-very-unhealthy: #8f3f97;
    --color-aqi-hazardous: #7e0023;
    
    /* Environmental Scale Colors (Wind, Solar, etc.) */
    --color-scale-0: #4ade80;
    --color-scale-1: #facc15;
    --color-scale-2: #fb923c;
    --color-scale-3: #f87171;
    --color-scale-4: #dc2626;
    --color-scale-5: #991b1b;
}

/* Light Theme - Auto (system preference) */
@media (prefers-color-scheme: light) {
    :root:not(.dark-theme) {
        /* Background Colors */
        --color-bg-primary: #fff;
        --color-bg-secondary: #f5f5f5;
        --color-bg-overlay: rgba(0, 0, 0, 0.05);
        
        /* Text Colors */
        --color-text-primary: #000;
        --color-text-secondary: #333;
        --color-text-tertiary: #666;
        
        /* Border Colors */
        --color-border-primary: #000;
        --color-border-secondary: #ddd;
        
        /* Button Colors */
        --color-button-bg: #000;
        --color-button-text: #fff;
        --color-button-hover-bg: #fff;
        --color-button-hover-text: #000;
        
        /* Component Colors */
        --color-dropdown-bg: #fff;
        --color-dropdown-hover: #f5f5f5;
        --color-loading-spinner: #000;
    }
}

/* Light Theme - Forced */
:root.light-theme {
    /* Background Colors */
    --color-bg-primary: #fff;
    --color-bg-secondary: #f5f5f5;
    --color-bg-overlay: rgba(0, 0, 0, 0.05);
    
    /* Text Colors */
    --color-text-primary: #000;
    --color-text-secondary: #333;
    --color-text-tertiary: #666;
    
    /* Border Colors */
    --color-border-primary: #000;
    --color-border-secondary: #ddd;
    
    /* Button Colors */
    --color-button-bg: #000;
    --color-button-text: #fff;
    --color-button-hover-bg: #fff;
    --color-button-hover-text: #000;
    
    /* Component Colors */
    --color-dropdown-bg: #fff;
    --color-dropdown-hover: #f5f5f5;
    --color-loading-spinner: #000;
}

/* ============================================================================
   Reset & Base Styles
   ========================================================================= */

/**
 * Universal box-sizing and margin/padding reset
 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/**
 * Prevent visited links from changing color
 * Maintains consistent link styling across navigation
 */
a:visited {
    color: inherit;
}

/**
 * Body - Base layout and typography
 */
body {
    font-family: 'JetBrains Mono', monospace;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    min-height: 100vh;
}

/**
 * Main content container
 * Full width to accommodate various content types
 */
.container {
    width: 100%;
    margin: 0 auto;
}

/**
 * Primary heading
 */
h1 {
    font-size: 2rem;
    font-weight: 500;
}

/**
 * Form inputs - Inherit monospace font
 */
input {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

/**
 * Buttons - Base styling
 */
button {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    cursor: pointer;
    text-transform: lowercase;
    transition: all 0.2s;
}

/**
 * Disabled button state
 */
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================================================
   Layout Components
   ========================================================================= */

/**
 * Footer - Site attribution and links
 */
.footer {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

/**
 * Home link in footer
 */
.home-link {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.home-link:hover {
    color: var(--color-text-primary);
}

/* ============================================================================
   UI Components
   ========================================================================= */

/**
 * Card Component
 * Primary container for content sections
 */
.card {
    background: var(--color-bg-overlay);
    color: var(--color-text-primary);
    border: none;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/**
 * Button Component
 * Primary action button with inverted hover state
 */
.btn {
    width: 100%;
    padding: 1rem 0.75rem;
    background: var(--color-button-bg);
    color: var(--color-button-text);
    border: 1px solid var(--color-border-primary);
    font-size: 1rem;
}

.btn:hover:not(:disabled) {
    background: var(--color-button-hover-bg);
    color: var(--color-button-hover-text);
}

/**
 * Input Component
 * Text input with focus state
 */
.input {
    padding: 1rem 0.75rem;
    border: 1px solid var(--color-border-primary);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: 1rem;
}

.input:focus {
    outline: 2px solid var(--color-border-primary);
    outline-offset: 2px;
}

.input::placeholder {
    color: var(--color-text-muted);
}

/**
 * Input Group
 * Container for input with dropdown (position context for absolute positioning)
 */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
}

/**
 * Dropdown Component
 * Autocomplete dropdown for city search
 * Positioned absolutely below input field
 */
.dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    max-height: 250px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

/**
 * Show dropdown when active
 */
.dropdown.show {
    display: block;
}

/**
 * Dropdown item - Individual search result
 */
.dropdown-item {
    padding: 0.75rem;
    cursor: pointer;
    border-bottom: 1px solid var(--color-border-secondary);
    font-size: 0.875rem;
    transition: background 0.15s;
    color: var(--color-text-primary);
}

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

.dropdown-item:hover {
    background: var(--color-dropdown-hover);
}

/**
 * Loading and no-results states
 */
.dropdown-item.loading,
.dropdown-item.no-results {
    cursor: default;
    color: var(--color-text-tertiary);
}

.dropdown-item.no-results {
    background: var(--color-bg-primary);
}

.dropdown-item.no-results:hover {
    background: var(--color-bg-primary);
}

/**
 * City name (primary text in dropdown)
 */
.city-name {
    display: block;
    font-weight: 500;
    color: var(--color-text-primary);
}

/**
 * City detail (secondary text - county, etc.)
 */
.city-detail {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-top: 0.25rem;
}

/**
 * Loading Component
 * Shows loading state with optional spinner animation
 */
.loading {
    padding: 1rem 0;
    font-size: 0.875rem;
}

/**
 * Loading with spinner animation
 */
.loading.fetching {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.loading.fetching::before {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border-secondary);
    border-top-color: var(--color-loading-spinner);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    flex-shrink: 0;
}

/**
 * Spinner rotation animation
 */
@keyframes spin {
    to { transform: rotate(360deg); }
}

/**
 * Error Component
 * Displays error messages
 */
.error {
    background: var(--color-bg-overlay);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-secondary);
    padding: 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
}

/**
 * Divider Component
 * Horizontal rule with centered text (e.g., "or")
 */
.divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin: 1rem 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border-secondary);
}

/**
 * Section Divider
 * Separates major content sections
 */
.section-divider {
    border-top: 1px solid var(--color-border-secondary);
    border-bottom: 1px solid var(--color-border-secondary);
    padding: 1rem 0;
}

/* ============================================================================
   Data Display Components
   ========================================================================= */

/**
 * Label Component
 * Small uppercase labels for data fields
 */
.label {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

.label-small {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

/**
 * Detail Item Component
 * Displays label-value pairs for measurements
 */
.detail-item,
.measurement-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem;
    border: none;
    background: var(--color-bg-overlay);
}

.detail-label,
.measurement-label {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

.detail-label i,
.measurement-label i {
    margin-right: 0.35rem;
}

.detail-value {
    font-size: 0.875rem;
    font-weight: 500;
}

.measurement-value {
    font-size: 1.25rem;
    font-weight: 500;
}

.measurement-unit {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

/**
 * Data Display Grid
 * Grid layout for displaying multiple measurements
 */
.data-grid {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.measurements-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

/**
 * Section Components
 */
.data-section {
    padding: 1rem 0;
    border-top: 1px solid var(--color-border-secondary);
}

.data-section:first-child {
    border-top: none;
    padding-top: 0;
}

.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
    margin-bottom: 1rem;
}

/**
 * Info Text Component
 */
.info-text {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    line-height: 1.5;
    padding: 0.75rem;
    border: none;
    background: var(--color-bg-overlay);
}

/**
 * Last Updated Component
 */
.last-updated {
    padding: 0.75rem;
    border: none;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    text-align: center;
    background: var(--color-bg-overlay);
}

/* ============================================================================
   Layout Utilities
   ========================================================================= */

/**
 * Grid System
 * Responsive grid layouts with auto-fit columns
 */
.grid {
    display: grid;
    gap: 0.75rem;
}

.grid-auto-fit {
    grid-template-columns: 1fr;
}

.grid-auto-fit-large {
    grid-template-columns: 1fr;
}

.grid-auto-fit-xlarge {
    grid-template-columns: 1fr;
}

/* ============================================================================
   Utility Classes
   ========================================================================= */

/**
 * Text Color Utilities
 */
.text-muted {
    color: var(--color-text-tertiary);
}

.text-secondary {
    color: var(--color-text-secondary);
}

/**
 * Text Size Utilities
 */
.text-small {
    font-size: 0.75rem;
}

.text-xs {
    font-size: 0.625rem;
}

/**
 * Spacing Utilities
 */
.mt-1 { margin-top: 1rem; }
.mb-1 { margin-bottom: 1rem; }
.p-1 { padding: 1rem; }

/* ============================================================================
   Page Layouts
   ========================================================================= */

/**
 * Page Container
 * Standard page layout with centered content
 */
.page-container {
    display: flex;
    flex-direction: column;
    padding: 0.75rem;
}

.page-container .container {
    margin: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/**
 * Page Title Heading
 * Bordered title with optional controls
 */
.page-title {
    text-transform: lowercase;
    border: 1px solid var(--color-border-primary);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.page-title i {
    margin-right: 0.5rem;
}

/**
 * Home Page Layout
 */
.home-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.home-container .container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 0.75rem;
    padding-top: 0.75rem;
}

/* ============================================================================
   Feature Components
   ========================================================================= */

/**
 * Last Search Container
 * Displays previously searched location for quick access
 */
.last-search-container,
#lastSearchContainer {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.last-search-label {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-bottom: 0.25rem;
}

.last-search-item {
    cursor: pointer;
    padding: 0.5rem;
    border: 1px solid var(--color-border-secondary);
    font-size: 0.875rem;
    transition: background 0.15s;
}

.last-search-item:hover {
    background: var(--color-dropdown-bg);
}

/**
 * Unit Toggle Component
 * Toggle buttons for switching between units (°F/°C, mph/km/h)
 */
.unit-toggle {
    display: flex;
    gap: 0.5rem;
    font-size: 0.75rem;
    align-items: center;
}

.unit-toggle button {
    padding: 0.25rem 0.5rem;
    background: transparent;
    color: var(--color-text-tertiary);
    border: 1px solid var(--color-border-secondary);
    font-size: 0.75rem;
    transition: all 0.2s;
}

.unit-toggle button.active {
    background: var(--color-button-bg);
    color: var(--color-button-text);
    border-color: var(--color-border-primary);
}

.unit-toggle button:hover:not(:disabled) {
    border-color: var(--color-border-primary);
}

/**
 * Shortcut Grid
 * Grid of clickable shortcuts (home page)
 */
.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
}

.shortcut-item {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    border: 1px solid var(--color-border-primary);
    text-decoration: none;
    color: var(--color-text-primary);
    font-size: 0.8125rem;
    transition: all 0.2s;
    background: var(--color-bg-primary);
    margin: 0;
}

.shortcut-item:visited {
    color: var(--color-text-primary);
}

.shortcut-item:hover {
    background: var(--color-bg-secondary);
}

.shortcut-item i {
    font-size: 2.5rem;
}

/* ============================================================================
   Site Header
   ========================================================================= */

/**
 * Site Header
 * Shared header for all pages
 */
.site-header {
    padding: 1rem;
    border-bottom: 1px solid var(--color-border-primary);
}

.header-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.site-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    flex: 1;
}

.site-header h1 i {
    margin-right: 0.25rem;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s;
    flex-shrink: 0;
    min-width: 2.5rem;
    height: 2.5rem;
}

.theme-toggle:hover {
    opacity: 0.6;
}

.back-button {
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: none;
    border: none;
    padding: 0;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--color-border-primary);
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 400;
    width: 100%;
    display: block;
}

.back-button i {
    font-size: 1.125rem;
    font-weight: 600;
}

.back-button:hover {
    opacity: 0.6;
}

.back-button:active {
    opacity: 0.3;
}

.header-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-top: 1rem;
}

/* ============================================================================
   Responsive Design
   ========================================================================= */

/**
 * Scale Color Classes
 * Color coding for environmental scales (0-5)
 */
.scale-0 { color: var(--color-scale-0); }
.scale-1 { color: var(--color-scale-1); }
.scale-2 { color: var(--color-scale-2); }
.scale-3 { color: var(--color-scale-3); }
.scale-4 { color: var(--color-scale-4); }
.scale-5 { color: var(--color-scale-5); }

/* Solar scale variants */
.scale-r0, .scale-s0, .scale-g0 { color: var(--color-scale-0); }
.scale-r1, .scale-s1, .scale-g1 { color: var(--color-scale-1); }
.scale-r2, .scale-s2, .scale-g2 { color: var(--color-scale-2); }
.scale-r3, .scale-s3, .scale-g3 { color: var(--color-scale-3); }
.scale-r4, .scale-s4, .scale-g4 { color: var(--color-scale-4); }
.scale-r5, .scale-s5, .scale-g5 { color: var(--color-scale-5); }

/* ============================================================================
   Generic Data Display Components
   ========================================================================= */

/**
 * Data Main Container
 * Primary data display section with borders
 */
.data-main {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem 0;
    border-top: 1px solid var(--color-border-secondary);
    border-bottom: 1px solid var(--color-border-secondary);
}

/**
 * Data Display Layout
 * Horizontal layout for icon/circle + info
 */
.data-display {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: flex-start;
}

/**
 * Data Info Container
 * Flexible container for data details
 */
.data-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/**
 * Data Circle Indicator
 * Circular display for primary metrics (AQI, Wind, etc.)
 */
.data-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border: 3px solid;
    position: relative;
    background: var(--color-bg-primary);
}

.data-circle-sm {
    width: 80px;
    height: 80px;
}

/**
 * Data Icon
 * Square icon display (weather icons, etc.)
 */
.data-icon {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.data-icon-sm {
    width: 50px;
    height: 50px;
}

/**
 * Value Display Components
 */
.value-primary {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
}

.value-large {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.value-medium {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
}

.value-standard {
    font-size: 1.25rem;
    font-weight: 700;
}

.value-small {
    font-size: 1.25rem;
    font-weight: 700;
}

.value-category {
    font-size: 1.25rem;
    font-weight: 700;
    text-transform: lowercase;
}

.value-unit {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.value-description {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    line-height: 1.5;
}

.value-secondary {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

/**
 * Data Arrow/Icon Indicators
 */
.data-arrow {
    font-size: 1.25rem;
    transition: transform 0.5s ease;
    line-height: 1;
}

.data-container {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

/**
 * Generic Grid Layouts
 */
.data-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.data-grid-md {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.data-grid-lg {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

/**
 * Generic Card Item
 * Reusable card for grid items
 */
.data-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.75rem;
    border: none;
    align-items: center;
    text-align: center;
    background: var(--color-bg-overlay);
}

.data-card-start {
    align-items: flex-start;
    text-align: left;
}

.data-card-lg {
    padding: 1rem;
}

/**
 * Horizontal Scrollable List
 */
.data-scroll {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.data-scroll::-webkit-scrollbar {
    height: 6px;
}

.data-scroll::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

.data-scroll::-webkit-scrollbar-thumb {
    background: var(--color-border-secondary);
    border-radius: 3px;
}

.data-scroll-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.75rem;
    border: none;
    min-width: 100px;
    align-items: center;
    text-align: center;
    background: var(--color-bg-overlay);
}

/**
 * Reference Card
 * For displaying scales, legends, reference info
 */
.reference-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem;
    border: none;
    font-size: 0.75rem;
    background: var(--color-bg-overlay);
}

.reference-title {
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.reference-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.reference-color {
    width: 20px;
    height: 20px;
    border-radius: 2px;
    flex-shrink: 0;
}

.reference-range {
    font-weight: 500;
    min-width: 60px;
}

/**
 * Text Content Box
 */
.text-box {
    padding: 0.75rem;
    border: none;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background: var(--color-bg-overlay);
}

/**
 * Generic Item Name/Label
 */
.item-name {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: lowercase;
}

.item-time {
    font-size: 0.75rem;
    font-weight: 500;
}