/* Base SEO & Accessibility Enhancements */
.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;
}

/* Rendering Performance (Core Web Vitals) */
#nutrientGrid {
    content-visibility: auto;
    contain-intrinsic-size: 1000px;
}

/* Accessibility: High-contrast focus state for SEO/A11y */
:focus-visible {
    outline: 2px solid #4f46e5 !important;
    outline-offset: 4px !important;
}

body {
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark {
    background-color: #0f172a !important;
    color: #f1f5f9;
}

body.dark header, body.dark main, body.dark footer {
    border-color: rgba(255, 255, 255, 0.1) !important;
}

body.dark .text-slate-900 { color: #f1f5f9 !important; }
body.dark .text-slate-700 { color: #cbd5e1 !important; }
body.dark .text-slate-600 { color: #94a3b8 !important; }
body.dark .text-slate-500 { color: #64748b !important; }
body.dark .bg-white { background-color: #1e293b !important; }
body.dark .border-slate-200 { border-color: rgba(255, 255, 255, 0.1) !important; }

/* Respect User Motion Preferences (UX Signal for SEO) */
@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;
    }
}

/* Glassmorphism Styles */
.glass-effect {
    background: rgba(255, 255, 255, 0.45);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    transition: background 0.3s ease, border-color 0.3s ease;
}

body.dark .glass-effect {
    background: rgba(15, 23, 42, 0.7);
    border-color: rgba(255, 255, 255, 0.1);
}

.glass-card {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark .glass-card {
    background: rgba(30, 41, 59, 0.7);
    border-color: rgba(255, 255, 255, 0.1);
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.85);
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border-color: rgba(99, 102, 241, 0.4);
}

body.dark .glass-card:hover {
    background: rgba(51, 65, 85, 0.9);
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.luminous-glass {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid rgba(139, 92, 246, 0.3);
    box-shadow: 
        0 25px 50px -12px rgba(139, 92, 246, 0.25),
        inset 0 0 40px rgba(139, 92, 246, 0.05);
    transition: background 0.3s ease, border-color 0.3s ease;
}

body.dark .luminous-glass {
    background: rgba(15, 23, 42, 0.95);
    border-color: rgba(139, 92, 246, 0.4);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Background Decorations */
.bg-blob {
    position: fixed;
    width: 600px;
    height: 600px;
    filter: blur(100px);
    border-radius: 50%;
    z-index: -1;
    opacity: 0.15;
    animation: move 20s infinite alternate cubic-bezier(0.45, 0, 0.55, 1);
}

@keyframes move {
    from { transform: translate(-10%, -10%) rotate(0deg); }
    to { transform: translate(20%, 30%) rotate(360deg); }
}

.blob-1 { background: linear-gradient(135deg, #6366f1, #818cf8); top: -150px; left: -150px; }
.blob-2 { background: linear-gradient(135deg, #f97316, #fb923c); bottom: -150px; right: -150px; animation-duration: 25s; }
.blob-3 { background: linear-gradient(135deg, #3b82f6, #60a5fa); top: 40%; left: 30%; animation-duration: 18s; }

.filter-btn {
    backdrop-filter: blur(4px);
    background: rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.filter-btn.active {
    background: #4f46e5;
    color: white;
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
    border-color: transparent;
    transform: translateY(-2px);
}

/* Modal Animations and Highlighting */
.modal-section-highlight {
    animation: pulse-ring 2s cubic-bezier(0.4, 0, 0.6, 1) 2;
}

@keyframes pulse-ring {
    0%, 100% { border-color: rgba(255, 255, 255, 0.4); box-shadow: none; }
    50% { border-color: #6366f1; box-shadow: 0 0 20px rgba(99, 102, 241, 0.2); }
}

.custom-scrollbar::-webkit-scrollbar {
    width: 6px;
}
.custom-scrollbar::-webkit-scrollbar-track {
    background: transparent;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

.action-link {
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

#modalBenefits > div, #modalSources > div, #modalSymptoms > div,
#modalBenefits li, #modalSources li, #modalSymptoms li {
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#modalBenefits li::marker {
    content: counters(list-item, ".") " ";
    color: #4f46e5;
    font-weight: 800;
}

#modalSources li::marker {
    content: "● ";
    color: #818cf8;
    font-size: 1.2em;
}

#modalSymptoms li::marker {
    content: "▲ ";
    color: #f43f5e;
    font-size: 0.8em;
}

#modalBenefits li:hover, #modalSources li:hover, #modalSymptoms li:hover {
    transform: scale(1.01);
}

/* Print Styles for SEO/UX Utility */
@media print {
    .bg-blob, #langToggle, .filter-btn, #searchInput, .glass-header, #paginationContainer {
        display: none !important;
    }
    body {
        background: white !important;
        color: black !important;
    }
    .glass-card {
        break-inside: avoid;
        border: 1px solid #eee !important;
        background: white !important;
        backdrop-filter: none !important;
    }
    main {
        max-width: 100% !important;
        padding: 0 !important;
    }
}