/* Production-Ready Enhancements */

/* Smooth page transitions */
body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Enhanced Hero with particles effect */
.index-hero::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
    animation: particles 20s linear infinite;
}

@keyframes particles {
    0% { transform: translateY(0); }
    100% { transform: translateY(-50px); }
}

/* Glass morphism for cards */
.paper-card {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

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

/* Enhanced focus states for accessibility */
a:focus, button:focus {
    outline: 3px solid var(--color-purple);
    outline-offset: 2px;
}

/* Loading skeleton animation */
@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

/* Improved shadow depths */
.paper-card,
.theme-card,
.result-card,
.finding-card {
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 4px 12px rgba(0, 0, 0, 0.08),
        0 8px 24px rgba(0, 0, 0, 0.06);
}

/* Enhanced hover states with scale and lift */
.paper-card:hover,
.theme-card:hover {
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.08),
        0 12px 32px rgba(139, 92, 246, 0.15),
        0 24px 48px rgba(139, 92, 246, 0.1);
}

/* Gradient text for headings */
.section-header {
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Animated underline for links */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-purple);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* Floating animation for badges */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.badge {
    animation: float 3s ease-in-out infinite;
}

.badge:nth-child(2) { animation-delay: 0.5s; }
.badge:nth-child(3) { animation-delay: 1s; }
.badge:nth-child(4) { animation-delay: 1.5s; }

/* Enhanced author photos with ring */
.author-photo {
    position: relative;
}

.author-photo::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-purple), var(--color-blue));
    opacity: 0;
    transition: opacity 0.3s;
    z-index: -1;
}

.author:hover .author-photo::before {
    opacity: 1;
}

/* Improved button interactions */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

/* Stagger animation for elements */
.paper-highlights .highlight-item {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.paper-highlights .highlight-item:nth-child(1) { animation-delay: 0.1s; }
.paper-highlights .highlight-item:nth-child(2) { animation-delay: 0.2s; }
.paper-highlights .highlight-item:nth-child(3) { animation-delay: 0.3s; }

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

/* Section dividers */
.content-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--color-purple), transparent);
    opacity: 0.3;
}

/* Enhanced table styling */
.results-table {
    border-collapse: separate;
    border-spacing: 0;
}

.results-table thead tr {
    background: linear-gradient(135deg, var(--color-dark), #374151);
}

.results-table tbody tr {
    transition: all 0.3s;
}

.results-table tbody tr:hover {
    transform: scale(1.01);
}

/* Scroll reveal animation */
@keyframes scrollReveal {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal {
    animation: scrollReveal 0.8s ease-out;
}

/* Mobile menu improvements */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 1rem;
    }
    
    .paper-card {
        margin: 0 1rem;
    }
}

/* Print styles */
@media print {
    .nav-link::after,
    .btn::before,
    .btn::after {
        display: none;
    }
}

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

/* ========================================
   MOBILE OPTIMIZATIONS
   ======================================== */

@media (max-width: 768px) {
    /* Improve touch targets */
    .btn,
    .nav-link,
    .author {
        min-height: 44px;
        min-width: 44px;
    }

    /* Better spacing on mobile */
    .paper-card {
        margin: 0 0 2rem 0;
        padding: 2rem 1.5rem;
    }

    /* Stack author photos */
    .authors-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    /* Larger text for readability */
    .main-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    /* Better table scrolling */
    .table-container {
        -webkit-overflow-scrolling: touch;
    }

    /* Improve button layout */
    .action-buttons {
        flex-direction: column;
        width: 100%;
        padding: 0 1rem;
    }

    .btn {
        width: 100%;
    }

    /* Better badge wrapping */
    .feature-badges {
        gap: 0.5rem;
    }

    .badge {
        font-size: 0.8rem;
        padding: 0.5rem 0.875rem;
    }

    /* Optimize hero height */
    .index-hero {
        min-height: 60vh;
    }

    /* Better theme card sizing */
    .theme-card {
        padding: 2rem 1.5rem;
    }
}

/* Tablet optimization */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 90%;
    }

    .authors-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Large desktop optimization */
@media (min-width: 1440px) {
    .container {
        max-width: 1200px;
    }

    .main-title {
        font-size: 4rem;
    }

    .section-header {
        font-size: 3rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-dark: #f9fafb;
        --color-light-gray: #1f2937;
        --color-white: #111827;
        --color-gray: #d1d5db;
    }

    .bg-light {
        background: linear-gradient(180deg, #1f2937 0%, rgba(31, 41, 55, 0.5) 100%);
    }

    .paper-card,
    .theme-card,
    .result-card {
        background-color: #1f2937;
        border-color: #374151;
    }

    .results-table {
        background-color: #1f2937;
    }

    .results-table th {
        background: linear-gradient(135deg, #111827, #1f2937);
    }

    .results-table tbody tr:hover {
        background-color: #374151;
    }
}