/* ==========================================
   NEXT GENAI JUNIOR - Kids STEM Website
   A vibrant, fun design for ages 8-12
   ========================================== */

/* CSS Custom Properties - Vibrant Colors */
:root {
    /* Primary Colors */
    --electric-blue: #00D4FF;
    --neon-green: #39FF14;
    --hot-pink: #FF1493;
    --sunny-yellow: #FFE135;
    --orange-burst: #FF6B35;
    --purple-pop: #A855F7;

    /* Background Colors */
    --space-purple: #1a0a2e;
    --deep-space: #0d0221;
    --card-bg: rgba(255, 255, 255, 0.1);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-muted: rgba(255, 255, 255, 0.6);

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #1a0a2e 0%, #2d1b4e 50%, #1a0a2e 100%);
    --gradient-card-games: linear-gradient(135deg, #FF1493, #FF6B35);
    --gradient-card-projects: linear-gradient(135deg, #00D4FF, #39FF14);
    --gradient-card-coding: linear-gradient(135deg, #A855F7, #00D4FF);
    --gradient-card-videos: linear-gradient(135deg, #FFE135, #FF6B35);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);
    --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Nunito', sans-serif;
    background: var(--gradient-hero);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Fredoka', sans-serif;
    font-weight: 600;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Floating Background Shapes */
.floating-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape.circle {
    width: 300px;
    height: 300px;
    background: var(--electric-blue);
    border-radius: var(--radius-full);
    top: 10%;
    left: 5%;
}

.shape.circle.small {
    width: 150px;
    height: 150px;
    background: var(--hot-pink);
    top: 60%;
    right: 10%;
    animation-delay: -5s;
}

.shape.square {
    width: 200px;
    height: 200px;
    background: var(--neon-green);
    border-radius: var(--radius-md);
    top: 40%;
    right: 20%;
    transform: rotate(45deg);
    animation-delay: -10s;
}

.shape.square.small {
    width: 100px;
    height: 100px;
    background: var(--sunny-yellow);
    bottom: 20%;
    left: 15%;
    animation-delay: -15s;
}

.shape.triangle {
    width: 0;
    height: 0;
    border-left: 100px solid transparent;
    border-right: 100px solid transparent;
    border-bottom: 180px solid var(--purple-pop);
    opacity: 0.08;
    top: 70%;
    left: 60%;
    animation-delay: -7s;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    25% {
        transform: translateY(-30px) rotate(5deg);
    }

    50% {
        transform: translateY(-15px) rotate(-3deg);
    }

    75% {
        transform: translateY(-25px) rotate(2deg);
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(26, 10, 46, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: 'Fredoka', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 2rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

.logo-text {
    background: linear-gradient(135deg, var(--electric-blue), var(--neon-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.junior {
    background: linear-gradient(135deg, var(--hot-pink), var(--orange-burst));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--electric-blue);
    border-radius: 3px;
    transition: var(--transition-fast);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

.nav-link:hover {
    color: var(--electric-blue);
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, var(--electric-blue), var(--purple-pop));
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.9rem;
}

.lang-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--electric-blue);
    border-radius: 3px;
    transition: var(--transition-fast);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(26, 10, 46, 0.98);
    padding: var(--spacing-lg);
    flex-direction: column;
    gap: var(--spacing-md);
    z-index: 999;
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition-medium);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-link {
    font-size: 1.2rem;
    font-weight: 600;
    padding: var(--spacing-sm);
    text-align: center;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.mobile-link:hover {
    background: rgba(0, 212, 255, 0.2);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(70px + var(--spacing-xl)) var(--spacing-lg) var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--hot-pink), var(--orange-burst));
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.highlight-text {
    display: block;
    background: linear-gradient(135deg, var(--electric-blue), var(--neon-green), var(--sunny-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s infinite;
    background-size: 200% 100%;
}

@keyframes shimmer {
    0% {
        background-position: 100% 0;
    }

    100% {
        background-position: -100% 0;
    }
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 1.1rem;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--electric-blue), var(--purple-pop));
    color: white;
    box-shadow: 0 5px 20px rgba(0, 212, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.6);
}

.btn-primary.pulse {
    animation: buttonPulse 2s infinite;
}

@keyframes buttonPulse {

    0%,
    100% {
        box-shadow: 0 5px 20px rgba(0, 212, 255, 0.4);
    }

    50% {
        box-shadow: 0 5px 30px rgba(0, 212, 255, 0.8);
    }
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid var(--electric-blue);
}

.btn-secondary:hover {
    background: rgba(0, 212, 255, 0.2);
    transform: translateY(-3px);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.3rem;
}

/* Robot Mascot */
.hero-robot {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.robot-container {
    position: relative;
}

.robot {
    position: relative;
    animation: robotFloat 3s ease-in-out infinite;
}

@keyframes robotFloat {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

.robot-head {
    position: relative;
    width: 120px;
    height: 100px;
    background: linear-gradient(180deg, #4A5568, #2D3748);
    border-radius: 20px 20px 30px 30px;
    margin: 0 auto;
    box-shadow: inset 0 -10px 30px rgba(0, 0, 0, 0.3);
}

.robot-antenna {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 30px;
    background: #4A5568;
    border-radius: 5px;
}

.robot-antenna::before {
    content: '';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--electric-blue);
    border-radius: var(--radius-full);
    animation: antennaBlink 1s infinite;
    box-shadow: 0 0 20px var(--electric-blue);
}

@keyframes antennaBlink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.robot-face {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90px;
    height: 50px;
    background: #1a0a2e;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.robot-eye {
    width: 20px;
    height: 20px;
    background: var(--neon-green);
    border-radius: var(--radius-full);
    animation: eyeBlink 3s infinite;
    box-shadow: 0 0 15px var(--neon-green);
}

@keyframes eyeBlink {

    0%,
    45%,
    55%,
    100% {
        transform: scaleY(1);
    }

    50% {
        transform: scaleY(0.1);
    }
}

.robot-mouth {
    position: absolute;
    bottom: 5px;
    width: 40px;
    height: 8px;
    background: var(--electric-blue);
    border-radius: 4px;
    animation: mouthTalk 0.5s infinite;
}

@keyframes mouthTalk {

    0%,
    100% {
        transform: scaleX(1);
    }

    50% {
        transform: scaleX(0.7);
    }
}

.robot-body {
    position: relative;
    width: 140px;
    margin: 10px auto 0;
}

.robot-chest {
    width: 100px;
    height: 80px;
    background: linear-gradient(180deg, #4A5568, #2D3748);
    border-radius: 20px;
    margin: 0 auto;
    position: relative;
    box-shadow: inset 0 -10px 30px rgba(0, 0, 0, 0.3);
}

.robot-heart {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    background: var(--hot-pink);
    border-radius: var(--radius-full);
    animation: heartbeat 1s infinite;
    box-shadow: 0 0 20px var(--hot-pink);
}

@keyframes heartbeat {

    0%,
    100% {
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        transform: translate(-50%, -50%) scale(1.2);
    }
}

.robot-arm {
    position: absolute;
    width: 20px;
    height: 60px;
    background: linear-gradient(180deg, #4A5568, #2D3748);
    border-radius: 10px;
    top: 0;
}

.robot-arm.left {
    left: -10px;
    transform: rotate(-15deg);
}

.robot-arm.right {
    right: -10px;
    transform-origin: top center;
    animation: wave 1s ease-in-out infinite;
}

@keyframes wave {

    0%,
    100% {
        transform: rotate(15deg);
    }

    50% {
        transform: rotate(45deg);
    }
}

.robot-shadow {
    width: 100px;
    height: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-full);
    margin: 20px auto 0;
    animation: shadowPulse 3s ease-in-out infinite;
}

@keyframes shadowPulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 0.3;
    }

    50% {
        transform: scale(0.8);
        opacity: 0.5;
    }
}

/* Categories Section */
.categories {
    padding: var(--spacing-xxl) var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.section-title {
    text-align: center;
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--electric-blue), var(--hot-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.category-card {
    position: relative;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    transition: var(--transition-medium);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-card);
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    transition: var(--transition-medium);
}

.category-card.games .card-glow {
    background: var(--gradient-card-games);
}

.category-card.projects .card-glow {
    background: var(--gradient-card-projects);
}

.category-card.coding .card-glow {
    background: var(--gradient-card-coding);
}

.category-card.videos .card-glow {
    background: var(--gradient-card-videos);
}

.category-card:hover .card-glow {
    height: 100%;
    opacity: 0.1;
}

.card-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.card-title {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.card-arrow {
    font-size: 1.5rem;
    opacity: 0;
    transform: translateX(-10px);
    transition: var(--transition-fast);
}

.category-card:hover .card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* Features Section */
.features {
    padding: var(--spacing-xxl) var(--spacing-lg);
    background: rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-item {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    transition: var(--transition-medium);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.05);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--electric-blue);
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Fun Facts Section */
.fun-facts {
    padding: var(--spacing-xxl) var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.facts-carousel {
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
    position: relative;
    min-height: 150px;
}

.fact-card {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    opacity: 0;
    transform: translateX(50px);
    transition: var(--transition-medium);
}

.fact-card.active {
    opacity: 1;
    transform: translateX(0);
}

.fact-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.fact-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.fact-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.dot {
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
}

.dot.active {
    background: var(--electric-blue);
    transform: scale(1.2);
}

/* CTA Section */
.cta {
    padding: var(--spacing-xxl) var(--spacing-lg);
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.cta-decoration {
    margin-top: var(--spacing-lg);
    font-size: 2rem;
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.cta-decoration .star {
    animation: starSpin 3s linear infinite;
}

.cta-decoration .rocket {
    animation: rocketBounce 1s ease-in-out infinite;
}

@keyframes starSpin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes rocketBounce {

    0%,
    100% {
        transform: translateY(0) rotate(-45deg);
    }

    50% {
        transform: translateY(-10px) rotate(-45deg);
    }
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.4);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-family: 'Fredoka', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--electric-blue);
}

.copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Sub-Page Styles */
.page-hero {
    padding: calc(70px + var(--spacing-xl)) var(--spacing-lg) var(--spacing-xl);
    text-align: center;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.page-hero-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    animation: bounce 2s infinite;
}

.page-hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--electric-blue), var(--neon-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.content-section {
    padding: var(--spacing-xl) var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.content-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-medium);
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card);
}

.content-card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.content-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.content-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.content-card .btn {
    width: 100%;
}

/* Video Cards */
.video-card {
    position: relative;
    overflow: hidden;
}

.video-thumbnail {
    position: relative;
    padding-bottom: 56.25%;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(255, 20, 147, 0.9);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition-fast);
}

.video-card:hover .play-button {
    transform: translate(-50%, -50%) scale(1.1);
    background: var(--hot-pink);
}

/* Age Badge */
.age-badge {
    display: inline-block;
    background: var(--neon-green);
    color: var(--space-purple);
    padding: 2px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

/* Difficulty Levels */
.difficulty {
    display: flex;
    gap: 4px;
    margin-bottom: var(--spacing-sm);
}

.difficulty-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
}

.difficulty-dot.active {
    background: var(--sunny-yellow);
}

/* Back Link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--electric-blue);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    transition: var(--transition-fast);
}

.back-link:hover {
    transform: translateX(-5px);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

    .mobile-menu {
        display: flex;
    }

    .hero {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        order: 2;
    }

    .hero-robot {
        order: 1;
        min-height: 300px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr 1fr;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .robot {
        transform: scale(0.8);
    }
}