/* Root Variables */
:root {
    /* Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #000000;
    --text-secondary: #4a4a4a;
    --accent-primary: #58a6ff;
    --accent-secondary: #1f6feb;
    --border-color: #e0e0e0;
    
    /* Gradients */
    --gradient-blue: linear-gradient(135deg, #58a6ff, #1f6feb);
    --gradient-purple: linear-gradient(135deg, #8250df, #6639ba);
    --gradient-green: linear-gradient(135deg, #3fb950, #238636);
    --gradient-orange: linear-gradient(135deg, #f97316, #ea580c);
    --gradient-pink: linear-gradient(135deg, #ec4899, #be185d);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Enhanced Navigation Styles */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-secondary);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo Styles */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo i {
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Navigation Links */
.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

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

.nav-link:hover {
    color: var(--accent-primary);
}

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

/* Navigation Actions Container */
.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Common Button Styles */
.nav-actions button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Button Hover Effects */
.nav-actions button:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-actions button:active {
    transform: translateY(0);
}

/* Theme Toggle Specific */
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-toggle i {
    font-size: 1.2rem;
    color: var(--text-primary);
}

/* Search Toggle Specific */
.search-toggle i {
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none !important;
}

/* Dark/Light Mode Icons */
[data-theme="dark"] .theme-toggle i.fa-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle i.fa-sun {
    display: block;
}

[data-theme="light"] .theme-toggle i.fa-moon {
    display: block;
}

[data-theme="light"] .theme-toggle i.fa-sun {
    display: none;
}

/* Responsive Styles */
@media screen and (max-width: 575px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-actions {
        gap: 0.5rem;
    }

    .nav-actions button {
        width: 35px;
        height: 35px;
    }
}

/* Active States */
.nav-actions button.active {
    background: rgba(255, 255, 255, 0.2);
    color: var(--accent-primary);
}

/* Button Ripple Effect */
.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Dark/Light Mode Transitions */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #000000;
    --text-secondary: #4a4a4a;
    --border-color: #e0e0e0;
    --accent-primary: #0066ff;
    --accent-secondary: #3385ff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --gradient-blue: linear-gradient(135deg, #0066ff, #3385ff);
}

[data-theme="dark"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --text-primary: #ffffff;
    --text-secondary: #8b949e;
    --border-color: #30363d;
    --accent-primary: #58a6ff;
    --accent-secondary: #79b6ff;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --gradient-blue: linear-gradient(135deg, #58a6ff, #79b6ff);
}

/* Theme Transition */
body {
    transition: background-color 0.3s ease,
                color 0.3s ease;
}

/* Gradient Text */
.gradient-text {
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Desktop Styles */
@media screen and (min-width: 769px) {
    .mobile-menu-btn {
        display: none; /* Ensure it's hidden on desktop */
    }

    .nav-links {
        position: static;
        transform: none;
        flex-direction: row;
        padding: 0;
        background: none;
        width: auto;
    }
}

/* Desktop Hover Effects */
@media (min-width: 769px) {
    .nav-link {
        padding: 0.5rem 0;
        margin: 0 0.5rem;
    }

    .nav-link::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: var(--gradient-blue);
        opacity: 0;
        border-radius: 4px;
        z-index: -1;
        transform: scaleX(0.7) scaleY(0.7);
        transition: all 0.3s ease;
    }

    .nav-link:hover::before {
        opacity: 0.1;
        transform: scaleX(1) scaleY(1);
    }

    /* Floating effect on hover */
    .nav-link:hover {
        transform: translateY(-2px);
    }
}

/* Navigation Actions Enhancement */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-actions button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    background: transparent;
    border: 1px solid var(--border-color);
}

.nav-actions button:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
    border-color: var(--accent-primary);
}

/* Active States */
.nav-link.active {
    position: relative;
    color: var(--accent-primary);
    font-weight: 600;
}

.nav-link.active::after {
    width: 100%;
    opacity: 1;
}

/* Search Overlay */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    position: relative;
    max-width: 700px;
    margin: 2rem auto;
    padding: 2rem;
}

.search-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.search-input {
    flex: 1;
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-primary);
    outline: none;
}

.search-close {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    transition: all 0.3s ease;
}

.search-results {
    margin-top: 2rem;
    max-height: 70vh;
    overflow-y: auto;
    padding: 1rem;
}

/* Hero Section Styles */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 1rem;
    position: relative;
    overflow: hidden;
    width: 100%;
}

.hero-content {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(to right, rgba(0, 102, 255, 0.1), rgba(166, 184, 210, 0.2)), url('path/to/your/background-image.jpg') no-repeat center center/cover;
    color: var(--text-primary);
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 800px;
    margin: 0 auto;
}

/* Hero Headings */
.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 0.5s ease forwards;
}

.hero-tagline {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.7s ease forwards;
}

.hero-description {
    font-size: 1rem;
    margin-bottom: 2rem;
    animation: fadeInUp 0.9s ease forwards;
}

/* Stats Section */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat-item {
    text-align: center;
    animation: fadeInUp 1.1s ease forwards;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    transition: transform 0.3s ease;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Button Styles */
.hero-cta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Button Hover Effects */
.btn-primary {
    background: var(--gradient-blue);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-3px);
}

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

/* Responsive Styles */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .hero-description {
        font-size: 0.9rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }
}

/* Touch Device Optimization */
@media (hover: none) {
    .btn:hover {
        transform: none;
        box-shadow: none;
    }
    
    .btn:active {
        transform: translateY(2px);
    }
}

/* Card Styles */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
}

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.2);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.card-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    background: var(--bg-primary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    transform-origin: center;
}

.tag::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transform: translateX(-100%);
}

.tag:hover {
    transform: scale(1.05);
    background: var(--gradient-blue);
    color: white;
}

.card-link {
    color: var(--accent-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.card-link:hover {
    color: var(--accent-secondary);
}

.card-link::before {
    content: '→';
    position: absolute;
    right: -20px;
    opacity: 0;
    transition: all 0.3s ease;
}

.card-link:hover::before {
    opacity: 1;
    right: -25px;
}

/* Filter Bar Styles */
.filter-bar {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 2rem 0;
    padding: 1rem;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Active State */
.filter-btn.active {
    background: var(--gradient-blue);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.2);
}

/* Hover Effects */
.filter-btn:hover:not(.active) {
    transform: translateY(-2px);
    background: var(--bg-primary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Ripple Effect */
.filter-btn .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Card Grid for Tools */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.card {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.3s ease;
}

/* Card Animation States */
.card.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}

/* Responsive Styles */
@media screen and (max-width: 768px) {
    .filter-bar {
        gap: 0.5rem;
        padding: 0.5rem;
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

@media screen and (max-width: 480px) {
    .filter-bar {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 1rem;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }

    .filter-bar::-webkit-scrollbar {
        display: none; /* Chrome, Safari, Edge */
    }

    .filter-btn {
        white-space: nowrap;
    }
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 0 1rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.section-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Enhanced Responsive Design */

/* Large Screens (1200px and up) */
@media screen and (min-width: 1200px) {
    .card-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }

    .hero h1 {
        font-size: 4rem;
    }

    .section-header h2 {
        font-size: 3rem;
    }
}

/* Medium Screens (768px to 1199px) */
@media screen and (max-width: 1199px) {
    .card-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .section-header h2 {
        font-size: 2.5rem;
    }
}

/* Tablet Screens (576px to 767px) */
@media screen and (max-width: 767px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .nav-container {
        padding: 0.5rem;
    }

    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: var(--bg-secondary);
        padding: 1rem;
        flex-direction: column;
        align-items: center;
        transform: translateY(-100%);
        transition: transform 0.3s ease;
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .filter-bar {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    .filter-btn {
        font-size: 0.875rem;
        padding: 0.375rem 0.75rem;
    }

    .hero-content {
        padding: 0 1rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-tagline {
        font-size: 1.25rem;
    }
}

/* Mobile Screens (575px and below) */
@media screen and (max-width: 575px) {
    .card-grid {
        grid-template-columns: 1fr;
    }

    .card {
        margin: 0 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .hero-stats {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }

    .nav-actions {
        gap: 0.5rem;
    }

    .logo {
        font-size: 1.25rem;
    }
}

/* Mobile Landscape Mode */
@media screen and (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: 120vh;
    }

    .hero-content {
        padding-top: 4rem;
    }
}

/* Dark Mode Preferences */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0d1117;
        --bg-secondary: #161b22;
        --text-primary: #ffffff;
        --text-secondary: #8b949e;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: #dddddd;
        --border-color: #ffffff;
    }

    .card {
        border-width: 2px;
    }
}

/* Reduced Motion Preferences */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }

    .card:hover {
        transform: none;
    }
}

/* Print Styles */
@media print {
    .nav-container,
    .filter-bar,
    .card-link,
    .hero-graphics {
        display: none;
    }

    .card {
        break-inside: avoid;
        border: 1px solid #000;
    }

    body {
        background: white;
        color: black;
    }
}

/* Touch Device Optimizations */
@media (hover: none) {
    .card:hover {
        transform: none;
    }

    .nav-link::after {
        display: none;
    }

    .filter-btn:hover {
        background: var(--bg-secondary);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Category-specific colors */
[data-category="ai-ml"] .card-icon { background: var(--gradient-purple); }
[data-category="blockchain"] .card-icon { background: var(--gradient-orange); }
[data-category="cloud"] .card-icon { background: var(--gradient-blue); }
[data-category="security"] .card-icon { background: var(--gradient-green); }
[data-category="game-dev"] .card-icon { background: var(--gradient-pink); }

/* Specialized Category Styles */
[data-category="quantum"] .card-icon {
    background: linear-gradient(135deg, #7e22ce, #4c1d95);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-category="robotics"] .card-icon {
    background: linear-gradient(135deg, #e11d48, #be123c);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-category="edge"] .card-icon {
    background: linear-gradient(135deg, #0891b2, #0e7490);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-category="voice"] .card-icon {
    background: linear-gradient(135deg, #4f46e5, #3730a3);
    -webkit-background-clip: text;
    background-clip: text;
}

/* Gradient Border Animation */
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 12px;
    padding: 2px;
    background: var(--gradient-blue);
    mask: linear-gradient(#fff 0 0) content-box, 
          linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card:hover::before {
    opacity: 1;
}

/* Icon Animations */
.card-icon i {
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.card:hover .card-icon i {
    transform: scale(1.2) rotate(8deg);
}

/* Category-specific Hover Effects */
[data-category="ai-ml"]:hover {
    background: linear-gradient(145deg, var(--bg-secondary), #1a1f2a);
}

[data-category="blockchain"]:hover {
    background: linear-gradient(145deg, var(--bg-secondary), #1f1a2a);
}

/* Scroll Reveal Animation */
@keyframes revealFromBottom {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: revealFromBottom 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Staggered Card Animations */
.card {
    opacity: 0;
    animation: fadeInCard 0.6s ease forwards;
}

@keyframes fadeInCard {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Apply staggered delay to cards */
.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }
.card:nth-child(4) { animation-delay: 0.4s; }

/* Button Hover Effects */
.filter-btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.filter-btn::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: -100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transition: left 0.5s ease;
}

.filter-btn:hover::after {
    left: 100%;
}

/* Tag Hover Animation */
.tag {
    transition: all 0.3s ease;
    transform-origin: center;
}

.tag:hover {
    transform: scale(1.05);
    background: var(--gradient-blue);
    color: white;
}

/* Link Hover Effects */
.card-link {
    position: relative;
    transition: all 0.3s ease;
}

.card-link::before {
    content: '→';
    position: absolute;
    right: -20px;
    opacity: 0;
    transition: all 0.3s ease;
}

.card-link:hover::before {
    opacity: 1;
    right: -25px;
}

/* Pulse Animation for New Items */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.card[data-new="true"]::after {
    content: 'NEW';
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--gradient-green);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    animation: pulse 2s infinite;
}

/* Loading State Animation */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.card.loading {
    background: linear-gradient(
        90deg,
        var(--bg-secondary) 25%,
        var(--border-color) 50%,
        var(--bg-secondary) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Category Badge Styles */
.category-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Category-specific badge colors */
[data-category="ai-ml"] .category-badge {
    background: rgba(130, 80, 223, 0.1);
    color: #a78bfa;
}

[data-category="blockchain"] .category-badge {
    background: rgba(249, 115, 22, 0.1);
    color: #fb923c;
}

/* Section Transitions */
.section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Loading State Styles */
.card.loading {
    position: relative;
    overflow: hidden;
}

.card.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.05),
        transparent
    );
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Tooltip Styles */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 4px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

[data-tooltip]:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-8px);
}

/* Footer Styles */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
}

.footer-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.footer-section .logo {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--text-secondary);
    max-width: 300px;
    line-height: 1.6;
}

.footer-section h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-normal);
    display: inline-block;
    position: relative;
}

.footer-section ul a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -2px;
    left: 0;
    background: var(--gradient-blue);
    transition: width var(--transition-normal);
}

.footer-section ul a:hover {
    color: var(--accent-primary);
}

.footer-section ul a:hover::after {
    width: 100%;
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: all var(--transition-normal);
}

.social-links a:hover {
    color: var(--accent-primary);
    transform: translateY(-3px);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Footer Responsive Design */
@media screen and (max-width: 968px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }

    .footer-section:first-child {
        grid-column: 1 / -1;
    }
}

@media screen and (max-width: 768px) {
    .footer {
        padding: 3rem 0 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        padding: 0 1.5rem;
    }

    .footer-section {
        text-align: center;
        align-items: center;
    }

    .footer-section p {
        max-width: 100%;
    }

    .social-links {
        justify-content: center;
    }

    .footer-bottom {
        padding: 1.5rem;
        margin-top: 2rem;
    }
}

@media screen and (max-width: 480px) {
    .footer {
        padding: 2rem 0 1rem;
    }

    .footer-content {
        gap: 2rem;
        padding: 0 1rem;
    }

    .footer-section h3 {
        font-size: 1.1rem;
    }

    .footer-section .logo {
        font-size: 1.25rem;
    }

    .social-links {
        gap: 1rem;
    }

    .social-links a {
        font-size: 1.25rem;
    }

    .footer-bottom {
        padding: 1rem;
        margin-top: 1.5rem;
    }

    .footer-bottom p {
        font-size: 0.75rem;
    }
}

/* Footer Animation Effects */
.footer-section {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

.footer-section:nth-child(1) { animation-delay: 0.1s; }
.footer-section:nth-child(2) { animation-delay: 0.2s; }
.footer-section:nth-child(3) { animation-delay: 0.3s; }

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

/* Footer Hover Effects */
.footer-section ul a {
    position: relative;
    padding-left: 0;
    transition: padding-left 0.3s ease;
}

.footer-section ul a:hover {
    padding-left: 10px;
}

.social-links a {
    position: relative;
    overflow: hidden;
}

.social-links a::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--gradient-blue);
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s ease;
    border-radius: 50%;
    z-index: -1;
}

.social-links a:hover::before {
    opacity: 0.1;
    transform: scale(1.5);
}

/* Enhanced Footer Interactive Effects */

/* Glowing Social Icons */
.social-links a {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-primary);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.social-links a:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(88, 166, 255, 0.3);
}

.social-links a:hover i {
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* Interactive Quick Links */
.footer-section ul li {
    position: relative;
    transition: all 0.3s ease;
}

.footer-section ul a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-section ul a::before {
    content: '→';
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.footer-section ul a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

/* Pulsing Logo Effect */
.footer-section .logo {
    position: relative;
}

.footer-section .logo::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--gradient-blue);
    opacity: 0.1;
    border-radius: 50%;
    z-index: -1;
    transform: scale(0.8);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.8); opacity: 0.1; }
    50% { transform: scale(1.2); opacity: 0.05; }
    100% { transform: scale(0.8); opacity: 0.1; }
}

/* Interactive Newsletter Form */
.footer-newsletter {
    margin-top: 1rem;
}

.footer-newsletter input {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    color: var(--text-primary);
    width: 100%;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.footer-newsletter input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
    outline: none;
}

.footer-newsletter button {
    background: var(--gradient-blue);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.footer-newsletter button::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: -100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.footer-newsletter button:hover::after {
    left: 100%;
}

/* Interactive Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 45px;
    height: 45px;
    background: var(--gradient-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(88, 166, 255, 0.3);
}

/* Footer Links Hover Effect */
.footer-section ul a:hover {
    text-shadow: 0 0 8px rgba(88, 166, 255, 0.3);
    letter-spacing: 0.5px;
}

/* Interactive Copyright Text */
.footer-bottom p {
    position: relative;
    display: inline-block;
}

.footer-bottom p::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -2px;
    left: 50%;
    background: var(--gradient-blue);
    transition: all 0.3s ease;
}

.footer-bottom p:hover::after {
    width: 100%;
    left: 0;
}

/* Footer Section Hover Cards */
.footer-section {
    padding: 1.5rem;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.footer-section:hover {
    background: rgba(255, 255, 255, 0.02);
    transform: translateY(-5px);
}

/* Responsive Design System */

/* Extra Large Screens (1400px and up) */
@media screen and (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }

    .card-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }

    .hero-content {
        max-width: 1200px;
    }
}

/* Large Screens (1200px to 1399px) */
@media screen and (max-width: 1399px) {
    .container {
        max-width: 1140px;
    }

    .card-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
}

/* Medium Screens (992px to 1199px) */
@media screen and (max-width: 1199px) {
    .container {
        max-width: 960px;
        padding: 0 2rem;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .nav-links {
        gap: 1.5rem;
    }

    .footer-content {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
}

/* Tablet Screens (768px to 991px) */
@media screen and (max-width: 991px) {
    .container {
        max-width: 720px;
    }

    .card-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-container {
        padding: 0.75rem 1.5rem;
    }
}

/* Mobile Landscape (576px to 767px) */
@media screen and (max-width: 767px) {
    .container {
        max-width: 540px;
        padding: 0 1rem;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-secondary);
        padding: 1rem;
        flex-direction: column;
        transform: translateY(-100%);
        transition: transform 0.3s ease;
        z-index: 999;
    }

    .menu-open .nav-links {
        transform: translateY(0);
    }

    .nav-link {
        width: 100%;
        text-align: center;
        padding: 0.75rem;
    }

    .mobile-menu-btn {
        display: flex !important;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .hero-content {
        text-align: center;
        padding: 2rem 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 1rem;
    }

    .search-container {
        margin: 1rem;
        padding: 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

/* Mobile Portrait (575px and below) */
@media screen and (max-width: 575px) {
    .container {
        padding: 0 0.75rem;
    }

    .nav-container {
        padding: 0.5rem 1rem;
    }

    .logo {
        font-size: 1.25rem;
    }

    .nav-actions {
        gap: 0.5rem;
    }

    .nav-actions button {
        width: 35px;
        height: 35px;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .card {
        margin: 0 0.5rem;
    }

    .footer {
        padding: 2rem 0 1rem;
    }

    .footer-section {
        padding: 1rem;
    }

    .search-header {
        padding: 0.75rem;
    }

    .search-input {
        font-size: 1rem;
    }
}

/* Height-based Media Queries */
@media screen and (max-height: 600px) {
    .hero {
        min-height: auto;
        padding: 4rem 0;
    }

    .search-overlay {
        padding-top: 1rem;
    }
}

/* Device-specific Optimizations */
@media (hover: none) {
    .card:hover {
        transform: none;
    }

    .nav-link:hover::after {
        width: 0;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .nav-actions,
    .footer {
        display: none;
    }

    .card {
        break-inside: avoid;
        border: 1px solid #000;
    }
}

/* Theme Toggle Styles */
.theme-toggle {
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    cursor: pointer;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle i {
    font-size: 1.2rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

/* Theme Toggle Animation */
.theme-toggle .fa-sun {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(180deg);
}

.theme-toggle .fa-moon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0);
}

/* Theme Toggle States */
[data-theme="light"] .theme-toggle .fa-sun {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0);
}

[data-theme="light"] .theme-toggle .fa-moon {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(-180deg);
}

/* Theme Transition Animation */
.theme-transitioning * {
    transition: background-color 0.3s ease,
                color 0.3s ease,
                border-color 0.3s ease,
                box-shadow 0.3s ease !important;
}

/* Theme Toggle Hover Effects */
.theme-toggle:hover {
    background: rgba(var(--text-primary-rgb), 0.1);
    transform: scale(1.1);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Search Toggle */
.search-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Keep link colors unchanged */
a {
    color: inherit;
    text-decoration: none;
}

/* Overlay for mobile menu */
.menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 998;
}

/* Mobile styles */
@media (max-width: 575px) {
    /* Show mobile menu button */
    .mobile-menu-btn {
        display: block;
    }

    /* Hide navigation links by default */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 250px;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 2rem;
        transition: right 0.3s ease;
        z-index: 999;
    }

    /* Show menu when active */
    .nav-links.active {
        right: 0;
    }

    /* Style menu items for mobile */
    .nav-link {
        font-size: 1.1rem;
        padding: 1rem 0;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
    }

    /* Show overlay when menu is active */
    .menu-overlay.active {
        display: block;
        opacity: 1;
        visibility: visible;
    }
}

/* Author Signature Styles */
.author-signature {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.built-by {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.developer-name {
    background: linear-gradient(135deg, #ff6b6b, #4ecdc4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: 1px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.2s;
}

.developer-title {
    color: var(--text-secondary);
    font-style: italic;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.4s;
}

.developer-email {
    margin-top: 1rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    background: var(--bg-secondary);
    transition: all 0.3s ease;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.6s;
}

.developer-email:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #ff6b6b20, #4ecdc420);
}

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

/* Responsive styles */
@media (max-width: 575px) {
    .built-by {
        font-size: 1rem;
    }
    
    .developer-name {
        font-size: 1.2rem;
    }
    
    .developer-email {
        font-size: 0.9rem;
    }
}

/* Author Signature and Social Links Styles */
.developer-contacts {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.contact-link {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    background: var(--bg-secondary);
    transition: all 0.3s ease;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.6s;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.social-link {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.social-link i {
    font-size: 1.2rem;
}

/* Individual social link animations */
.social-link.github {
    animation-delay: 0.8s;
}

.social-link.linkedin {
    animation-delay: 1s;
}

.social-link.twitter {
    animation-delay: 1.2s;
}

/* Hover effects */
.social-link:hover {
    transform: translateY(-4px);
    color: white;
}

.social-link.github:hover {
    background: #0077b5;
}

.social-link.linkedin:hover {
    background: #0077b5;
}

.social-link.twitter:hover {
    background: #1DA1F2;
}

/* Tooltips */
.social-link .tooltip {
    position: absolute;
    bottom: -30px;
    font-size: 0.8rem;
    background: var(--bg-secondary);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.social-link:hover .tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Responsive adjustments */
@media (max-width: 575px) {
    .social-links {
        gap: 0.8rem;
    }

    .social-link {
        width: 35px;
        height: 35px;
    }

    .social-link i {
        font-size: 1rem;
    }
}

/* Optional: Add floating animation */
@keyframes float {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
    100% {
        transform: translateY(0);
    }
}

.social-link:hover {
    animation: float 2s ease infinite;
}