/* ==========================================================================
   Base Styles - Variables, Reset, Typography, Animations
   ========================================================================== */

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -50px;
    left: 6px;
    background: var(--color-midnight);
    color: var(--color-white);
    padding: 12px 16px;
    text-decoration: none;
    border-radius: var(--border-radius);
    z-index: 1001;
    transition: top var(--transition-base) ease;
    font-weight: 600;
    font-size: 1rem;
}

.skip-link:focus,
.skip-link:focus-visible {
    top: 0px;
    outline: 3px solid var(--color-electric);
    outline-offset: 3px;
    box-shadow: 0 0 0 1px var(--color-midnight), 0 0 0 4px var(--color-electric-overlay);
}

/* Screen reader only class for ARIA live regions */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:root {
    /* Brand Colors */
    --color-copper: #B87333;
    --color-copper-light: #D4A574;
    --color-copper-dark: #8B5A2B;

    /* Nature Colors */
    --color-forest: #2E5B3F;
    --color-forest-light: #4A7C5B;
    --color-forest-dark: #1F3D29;

    /* Neutral Colors */
    --color-midnight-dark: #202020;
    --color-midnight: #303030;
    --color-midnight-light: #404040;
    --color-midnight-lighter: #505050;
    --color-beach: #EDDEBA;
    --color-beach-dark: #D4C4A3;
    --color-white: #FFFFFF;
    --color-off-white: #FAFAFA;
    --color-light-gray: #F5F5F5;
    --color-medium-gray: #CCCCCC;
    --color-dark-gray: #666666;

    /* Accent Colors */
    --color-electric: #87CEEB;
    --color-electric-dark: #5BA0D3;
    --color-electric-darker: #3A7FB8;
    --color-accent: #FFD700; /* Gold accent for highlights */

    /* Gradients */
    --color-gradient-primary: linear-gradient(135deg, var(--color-forest) 0%, var(--color-copper) 50%, var(--color-electric-dark) 100%);
    --color-gradient-secondary: linear-gradient(135deg, var(--color-beach) 0%, var(--color-electric) 100%);
    --color-gradient-accent: linear-gradient(135deg, var(--color-copper-light) 0%, var(--color-accent) 100%);

    /* Semi-transparent Colors - Consolidated overlay system */
    /* White overlays */
    --color-white-overlay: rgba(255, 255, 255, 0.1);
    --color-white-overlay-light: rgba(255, 255, 255, 0.05);
    --color-white-overlay-strong: rgba(255, 255, 255, 0.2);
    
    /* Black overlays */
    --color-black-overlay: rgba(0, 0, 0, 0.15);
    --color-black-overlay-light: rgba(0, 0, 0, 0.05);
    --color-black-overlay-medium: rgba(0, 0, 0, 0.1);
    --color-black-overlay-heavy: rgba(0, 0, 0, 0.2);
    --color-black-overlay-strong: rgba(0, 0, 0, 0.3);
    
    /* Copper overlays */
    --color-copper-overlay: rgba(184, 115, 51, 0.1);
    --color-copper-overlay-light: rgba(184, 115, 51, 0.15);
    --color-copper-overlay-medium: rgba(184, 115, 51, 0.2);
    --color-copper-overlay-strong: rgba(184, 115, 51, 0.3);
    
    /* Electric overlays */
    --color-electric-overlay: rgba(135, 206, 235, 0.3);
    --color-electric-glow: rgba(135, 206, 235, 0.5);
    
    /* Midnight overlays */
    --color-midnight-transparent: rgba(48, 48, 48, 0.95);
    --color-midnight-overlay-light: rgba(48, 48, 48, 0.15);
    --color-midnight-overlay-medium: rgba(48, 48, 48, 0.25);
    --color-midnight-overlay-heavy: rgba(48, 48, 48, 0.7);

    /* Shadows & Effects */
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.25);
    --shadow-subtle: 0 2px 10px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --border-radius: 12px;
    --border-radius-large: 16px;

    /* Content Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    --spacing-4xl: 4rem;
    --spacing-5xl: 5rem;
    --spacing-6xl: 6rem;

    /* Card Spacing */
    --card-padding: var(--spacing-2xl);
    --card-padding-sm: var(--spacing-lg);
    --card-margin: var(--spacing-2xl);
    --card-margin-sm: var(--spacing-lg);

    /* Grid Gaps */
    --grid-gap-sm: var(--spacing-md);
    --grid-gap-md: var(--spacing-lg);
    --grid-gap-lg: var(--spacing-2xl);

    /* Card Backgrounds */
    --card-bg-solid: linear-gradient(145deg, var(--color-white) 0%, var(--color-off-white) 100%);
    --card-bg-glass: linear-gradient(145deg, var(--color-white-overlay-light) 0%, rgba(255, 255, 255, 0.02) 100%);
    --card-bg-transparent: transparent;

    /* Section Backgrounds - Simplified to use base colors directly */
    --section-bg-beach: var(--color-beach);
    --section-bg-beach-dark: var(--color-beach-dark);
    --section-bg-forest-dark: var(--color-forest-dark);
    --section-bg-copper-dark: var(--color-copper-dark);
    --section-bg-midnight-dark: var(--color-midnight-dark);
    --section-bg-gradient-dark: linear-gradient(135deg, var(--color-copper-dark) 0%, var(--color-midnight) 100%);

    /* Transition Timings */
    --transition-fast: 0.2s;
    --transition-base: 0.3s;
    --transition-slow: 0.4s;
    --transition-easing: cubic-bezier(0.175, 0.885, 0.32, 1.275);

    /* Animation Timings */
    --animation-delay-stagger: 0.2s;
    --animation-duration-fast: 0.3s;
    --animation-duration-base: 0.6s;
    --animation-duration-slow: 0.8s;


    /* Responsive Breakpoints */
    /* 
     * Breakpoint system for consistent responsive design:
     * - xs: Very small devices (phones in portrait) - 480px
     * - sm: Small devices (phones in landscape, small tablets) - 768px
     * - md: Medium devices (tablets, small laptops) - 1024px
     * - lg: Large devices (desktops, large laptops) - 1200px
     * 
     * NOTE: CSS custom properties cannot be used in @media queries.
     * These variables are for documentation/reference only.
     * Media queries must use hardcoded pixel values: 480px, 768px, 1024px, 1200px
     */
    --breakpoint-xs: 480px;
    --breakpoint-sm: 768px;
    --breakpoint-md: 1024px;
    --breakpoint-lg: 1200px;

    /* Banner Image Paths */
    --banner-image-military-jpg: url('../assets/military+defense.jpg');
    --banner-image-military-webp: url('../assets/military+defense.webp');
    --banner-image-remote-jpg: url('../assets/logging-office.jpg');
    --banner-image-remote-webp: url('../assets/logging-office.webp');
    --banner-image-homes-jpg: url('../assets/off-grid-home-2.jpg');
    --banner-image-homes-webp: url('../assets/off-grid-home-2.webp');
    --banner-image-emergency-jpg: url('../assets/emergency-response.jpg');
    --banner-image-emergency-webp: url('../assets/emergency-response.webp');
    --banner-image-jobsites-jpg: url('../assets/mobile-power.jpg');
    --banner-image-jobsites-webp: url('../assets/mobile-power.webp');
    --banner-image-commercial-jpg: url('../assets/library-solar.jpg');
    --banner-image-commercial-webp: url('../assets/library-solar.webp');
    --banner-image-home-jpg: url('../assets/bg.jpg');
    --banner-image-home-webp: url('../assets/bg.webp');
}

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

/* ==========================================================================
   Base Styles & Typography
   ========================================================================== */

body {
    font-family: 'Space Grotesk', sans-serif;
    background-color: var(--color-beach);
    color: var(--color-midnight);
    line-height: 1.7;
    font-weight: 400;
    letter-spacing: 0.02em;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-top: 0;
}

h2 {
    font-size: 3.5rem;
    color: var(--color-midnight);
    text-align: center;
    margin-bottom: var(--spacing-4xl);
    position: relative;
    text-shadow: 0 2px 4px var(--color-black-overlay-light);
}

h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--color-gradient-accent);
    border-radius: 2px;
}

h3 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-midnight);
    margin-bottom: var(--spacing-lg);
    line-height: 1.3;
}

p {
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--color-dark-gray);
}

strong, b {
    font-weight: 600;
    color: var(--color-midnight);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ==========================================================================
   Animations & Keyframes
   ========================================================================== */

/* Unified fade-in animation with configurable distance */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp-sm {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shimmer {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Fade-in animation for targeted elements — add .fade-target class to elements you want animated */
@keyframes fade-target-fallback {
    to { opacity: 1; transform: translateY(0); }
}

.fade-target {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--animation-duration-base) ease, transform var(--animation-duration-base) ease;
    will-change: opacity, transform;
    animation: fade-target-fallback 0.4s ease 1.2s forwards;
}

.fade-target.fade-in {
    opacity: 1;
    transform: translateY(0);
    animation: none;
}


/* ==========================================================================
   Utilities & Accessibility
   ========================================================================== */

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-midnight-light);
}

::-webkit-scrollbar-thumb {
    background: var(--color-copper);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-copper-light);
}

/* Targeted transitions for interactive elements only (performance optimization) */
a, button {
    transition: border-color var(--transition-base) ease, 
                box-shadow var(--transition-base) ease,
                opacity var(--transition-base) ease;
}

.nav-logo, .menu-btn {
    transition: transform var(--transition-base) ease,
                opacity var(--transition-base) ease;
}

.card, .cta-button, .feature-item, .project-image, .overview-image, 
.highlight-item, .trust-feature {
    transition: transform var(--transition-base) ease,
                box-shadow var(--transition-base) ease;
}

/* Prevent flash on page load by ensuring smooth transitions only after load */
/* CSS fallback: if JS is blocked, fade in after 800ms so page is never invisible */
@keyframes body-fallback-fadein {
    to { opacity: 1; }
}

body {
    opacity: 0;
    transition: opacity var(--transition-base) ease;
    animation: body-fallback-fadein 0.3s ease 0.8s forwards;
}

body.loaded {
    opacity: 1;
    animation: none;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Enhanced focus states for accessibility */
a:focus-visible, 
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--color-electric);
    outline-offset: 3px;
    border-radius: 4px;
    box-shadow: 0 0 0 1px var(--color-midnight), 0 0 0 4px var(--color-electric-overlay);
}

/* Fallback for browsers without focus-visible support */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
    outline: none;
}

/* Loading state for interactive elements */
.cta-button:active {
    transform: translateY(1px) scale(0.98);
}