/**
 * NixVir Shared Theme CSS
 * Common styles for snow-cover.html, snotel.html, and dashboard.html
 *
 * Usage: <link rel="stylesheet" href="/css/shared-theme.css">
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
    /* Background colors */
    --bg-deep: #0a0e14;
    --bg-card: #111820;
    --bg-elevated: #1a2230;

    /* Border colors */
    --border: #2a3444;
    --border-light: #3a4454;

    /* Text colors */
    --text-primary: #e8ecf2;
    --text-secondary: #9ca3b0;  /* Improved contrast: 4.5:1 on --bg-card */
    --text-muted: #8a919e;      /* Improved contrast: 4.5:1 on --bg-elevated */

    /* Accent colors - cold/blue spectrum */
    --accent-cold: #3b82f6;
    --accent-cold-bright: #60a5fa;
    --accent-blue: #3b82f6;
    --accent-blue-bright: #60a5fa;

    /* Accent colors - warm/orange spectrum */
    --accent-warm: #f97316;
    --accent-warm-bright: #fb923c;
    --accent-orange: #f97316;

    /* Status colors - improved contrast for dark backgrounds */
    --success: #34d399;         /* Lighter green: 4.5:1 on --bg-card */
    --accent-green: #34d399;
    --warning: #fbbf24;         /* Lighter yellow: 4.5:1 on --bg-card */
    --accent-yellow: #fbbf24;
    --danger: #f87171;          /* Lighter red: 4.5:1 on --bg-card */
    --accent-red: #f87171;
    --accent-purple: #a855f7;

    /* Geographic/map colors */
    --geo-fill: #1e293b;
    --geo-stroke: #334155;

    /* Snow visualization colors */
    --snow-heavy: #dbeafe;
    --snow-moderate: #60a5fa;
    --snow-light: #1e40af;
    --snow-none: #475569;

    /* Snowpack color scale (SNOTEL) */
    --swe-drought: #dc2626;
    --swe-below: #f97316;
    --swe-low: #facc15;
    --swe-normal: #22c55e;
    --swe-above: #3b82f6;
    --swe-high: #8b5cf6;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================
   Background Gradient
   ============================================ */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 15% 10%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 85% 90%, rgba(249, 115, 22, 0.04) 0%, transparent 50%),
        var(--bg-deep);
    z-index: -1;
}

/* Green variant for dashboard */
.bg-gradient-green {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 15% 10%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 85% 90%, rgba(16, 185, 129, 0.04) 0%, transparent 50%),
        var(--bg-deep);
    z-index: -1;
}

/* ============================================
   Site Banner & Navigation
   ============================================ */
.site-banner {
    background-image: url('/images/mtnsky.jpg');
    background-size: cover;
    background-position: center bottom;
    position: relative;
}

.site-banner-overlay {
    background: rgba(0, 0, 0, 0.6);
    padding-bottom: 1rem;
}

.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1700px;
    margin: 0 auto;
}

.site-nav .logo,
.site-nav-logo img {
    height: 40px;
    width: auto;
}

.site-nav .nav-links,
.site-nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.site-nav .nav-links a,
.site-nav-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.site-nav .nav-links a:hover,
.site-nav-links a:hover {
    color: white;
}

.site-nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.site-nav-links li {
    padding-right: 1rem;
}

/* ============================================
   Popup/Tooltip Row Styles
   ============================================ */
.popup-grid {
    display: grid;
    gap: 4px;
    font-size: 0.9em;
}

.popup-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

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

.popup-value {
    font-family: 'JetBrains Mono', monospace;
}

.popup-value-bold {
    font-family: 'JetBrains Mono', monospace;
    font-weight: bold;
}

/* ============================================
   Common Card Styles
   ============================================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
}

.card-elevated {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
}

/* ============================================
   Typography Helpers
   ============================================ */
.mono {
    font-family: 'JetBrains Mono', monospace;
}

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

/* ============================================
   NixVir Brand Stamp (for data visualizations)
   ============================================ */
.nixvir-brand {
    opacity: 0.85;
    transition: opacity 0.2s ease;
    z-index: 1000;
}

.nixvir-brand:hover {
    opacity: 1;
}

.nixvir-brand a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nixvir-brand img {
    height: 20px;
    width: auto;
}

/* Leaflet map control positioning */
.leaflet-control.nixvir-brand {
    background: rgba(10, 14, 20, 0.8);
    border-radius: 4px;
    padding: 4px 8px;
    margin: 10px !important;
}

/* For light map backgrounds */
.leaflet-control.nixvir-brand.on-light {
    background: rgba(255, 255, 255, 0.9);
}

/* Chart overlay positioning (bottom-left corner) */
.chart-nixvir-brand {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(10, 14, 20, 0.7);
    border-radius: 4px;
    padding: 3px 6px;
}

/* ============================================
   Accessibility: Focus Indicators
   ============================================ */
/* Visible focus styles for keyboard navigation (WCAG 2.4.7) */
button:focus-visible,
select:focus-visible,
input:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--accent-cold-bright);
    outline-offset: 2px;
}

/* Remove default outline only when focus-visible provides the indicator */
button:focus:not(:focus-visible),
select:focus:not(:focus-visible),
input:focus:not(:focus-visible) {
    outline: none;
}

/* ============================================
   Accessibility: Screen Reader Only
   ============================================ */
/* Visually hidden but accessible to screen readers (WCAG 1.3.1) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}