/* ============================================
   COMPATIBILITY.CSS - Browser Fallbacks & Polyfills
   ============================================ */

/* CSS Grid Fallback for IE11 */
@supports not (display: grid) {
    .ep-grid {
        display: flex;
        flex-wrap: wrap;
        margin: -1rem;
    }

    .ep-grid > * {
        flex: 0 0 calc(33.333% - 2rem);
        margin: 1rem;
    }

    .ep-grid--2 > * {
        flex: 0 0 calc(50% - 2rem);
    }

    .ep-grid--4 > * {
        flex: 0 0 calc(25% - 2rem);
    }

    @media (max-width: 1024px) {
        .ep-grid--3 > *,
        .ep-grid--4 > * {
            flex: 0 0 calc(50% - 2rem);
        }
    }

    @media (max-width: 768px) {
        .ep-grid > * {
            flex: 0 0 calc(100% - 2rem);
        }
    }
}

/* CSS Custom Properties Fallback */
.ep-container {
    padding-left: 1.5rem; /* 24px fallback */
    padding-right: 1.5rem;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.ep-section {
    padding-top: 5rem; /* 80px fallback */
    padding-bottom: 5rem;
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
}

.ep-btn {
    padding: 0.75rem 1.5rem; /* Fallback */
    padding: var(--space-3) var(--space-6);
    border-radius: 0.5rem; /* Fallback */
    border-radius: var(--radius-lg);
    transition: all 0.2s ease; /* Fallback */
    transition: all var(--transition-base);
}

.ep-card {
    padding: 2rem; /* Fallback */
    padding: var(--space-8);
    border-radius: 0.75rem; /* Fallback */
    border-radius: var(--radius-xl);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1); /* Fallback */
    box-shadow: var(--shadow-base);
}

/* Object-fit Fallback for IE11 */
@supports not (object-fit: cover) {
    img[style*="object-fit"] {
        width: 100%;
        height: auto;
    }
}

/* Sticky Position Fallback */
@supports not (position: sticky) {
    .ep-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
    }

    /* Add padding to body to compensate for fixed header */
    body {
        padding-top: 80px;
    }
}

/* CSS Variables Fallback for Critical Colors */
body {
    background-color: #FFFFFF; /* Fallback */
    background-color: var(--color-white);
    color: #111827; /* Fallback */
    color: var(--color-gray-900);
}

h1, h2, h3, h4, h5, h6 {
    color: #111827; /* Fallback */
    color: var(--color-gray-900);
}

.text-gray-600 {
    color: #4B5563 !important; /* Fallback */
    color: var(--color-gray-600) !important;
}

.bg-gray-50 {
    background-color: #F9FAFB !important; /* Fallback */
    background-color: var(--color-gray-50) !important;
}

.ep-btn--primary {
    background-color: #F59E0B; /* Fallback */
    background-color: var(--color-solar-500);
    color: #FFFFFF; /* Fallback */
    color: var(--color-white);
}

.ep-btn--primary:hover {
    background-color: #D97706; /* Fallback */
    background-color: var(--color-solar-600);
}

/* Flexbox Gap Fallback for Safari < 14.1 */
@supports not (gap: 1rem) {
    .ep-flex[style*="gap"] > * + * {
        margin-left: 1rem;
    }

    .ep-stats {
        margin: -1rem;
    }

    .ep-stats > * {
        margin: 1rem;
    }
}

/* CSS Aspect Ratio Fallback */
@supports not (aspect-ratio: 16 / 9) {
    .ep-hero-slide {
        position: relative;
        padding-bottom: 56.25%; /* 16:9 ratio */
        height: 0;
        overflow: hidden;
    }

    .ep-hero-slide > * {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}

/* Smooth Scrolling Fallback */
@supports not (scroll-behavior: smooth) {
    /* Fallback handled by JavaScript if needed */
    html {
        scroll-behavior: auto;
    }
}

/* CSS Clamp Fallback */
@supports not (font-size: clamp(1rem, 2vw, 2rem)) {
    h1 {
        font-size: 2.25rem; /* Fixed fallback */
    }

    h2 {
        font-size: 1.875rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    @media (max-width: 768px) {
        h1 {
            font-size: 1.875rem;
        }

        h2 {
            font-size: 1.5rem;
        }
    }
}

/* Backdrop Filter Fallback */
@supports not (backdrop-filter: blur(10px)) {
    .ep-mega-menu {
        background-color: rgba(255, 255, 255, 0.98); /* Solid fallback */
    }

    .ep-header--scrolled {
        background-color: rgba(255, 255, 255, 0.98);
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }
}

/* CSS Logical Properties Fallback */
@supports not (margin-inline-start: 1rem) {
    [dir="rtl"] .ep-btn i {
        margin-right: 0.5rem;
        margin-left: 0;
    }

    [dir="ltr"] .ep-btn i {
        margin-left: 0.5rem;
        margin-right: 0;
    }
}

/* Print Styles */
@media print {
    .ep-header,
    .ep-footer,
    .ep-btn,
    .ep-hero {
        display: none !important;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }

    .ep-section {
        page-break-inside: avoid;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .ep-btn {
        border: 2px solid currentColor;
    }

    .ep-card {
        border: 1px solid currentColor;
    }
}

/* Dark Mode Preparation (if needed in future) */
@media (prefers-color-scheme: dark) {
    /* Add dark mode styles if needed */
    /* Currently site uses light theme only */
}