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

:root {
    /* Colors */
    --primary-color: #00ff88;
    --secondary-color: #a855f7;
    --accent-color: #00d4ff;
    --dark-bg: #0a0e27;
    --card-bg: #151933;
    --text-light: #e2e8f0;
    --text-dim: #94a3b8;

    /* Gradients */
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #00ff88 0%, #00d4ff 100%);

    /* Shadows */
    --shadow-glow: 0 0 20px rgba(0, 255, 136, 0.3);
    --shadow-card: 0 4px 6px rgba(0, 0, 0, 0.1);

    /* Animation Durations (2026 Best Practices: 200-500ms) */
    --duration-fast: 200ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;

    /* Easing */
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

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

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
}

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

/* Fade-in animations (2026 micro-interactions) */
.fade-in-hidden {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--duration-slow) var(--ease-smooth) var(--animation-delay, 0ms),
                transform var(--duration-slow) var(--ease-smooth) var(--animation-delay, 0ms);
}

.fade-in-visible {
    opacity: 1;
    transform: translateY(0);
}

body {
    font-family: 'Heebo', sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Skip to main content link (accessibility) */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary-color);
    color: var(--dark-bg);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    font-weight: 700;
    z-index: 9999;
    transition: top var(--duration-fast) var(--ease-smooth);
}

.skip-link:focus {
    top: 0;
}

/* Scroll Progress Indicator */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-2);
    transform-origin: 0%;
    transform: scaleX(0);
    z-index: 9998;
    transition: transform var(--duration-fast) var(--ease-smooth);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Mobile-first: Increase padding on larger screens */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, var(--dark-bg) 0%, #1a1f3a 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(168, 85, 247, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 255, 136, 0.15) 0%, transparent 50%);
    animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particles::before,
.particles::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 10s ease-in-out infinite;
}

.particles::before {
    background: var(--primary-color);
    top: 20%;
    left: 10%;
}

.particles::after {
    background: var(--secondary-color);
    bottom: 20%;
    right: 10%;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(50px, -50px); }
    66% { transform: translate(-50px, 50px); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    position: relative;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.badge {
    display: inline-block;
    background: var(--gradient-2);
    color: var(--dark-bg);
    padding: 10px 25px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 20px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.hero h1 {
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 900;
    margin-bottom: 10px;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.subtitle {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-light);
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--text-dim);
    max-width: 700px;
    margin: 0 auto 40px;
}

.highlight {
    color: var(--primary-color);
    font-weight: 700;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: clamp(1rem, 2vw, 1.1rem);
    font-weight: 700;
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

/* Ripple effect for buttons */
.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width var(--duration-slow) var(--ease-smooth),
                height var(--duration-slow) var(--ease-smooth);
}

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

.btn-icon {
    font-size: 1.2em;
    transition: transform var(--duration-normal) var(--ease-bounce);
}

.btn:hover .btn-icon {
    transform: scale(1.2) rotate(10deg);
}

.btn-primary {
    background: var(--gradient-2);
    color: var(--dark-bg);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.6);
}

.btn-primary:active {
    transform: translateY(-1px) scale(0.98);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    transform: translateY(-3px);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: clamp(1.1rem, 2.5vw, 1.3rem);
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 20px;
}

.underline {
    width: 100px;
    height: 4px;
    background: var(--gradient-2);
    margin: 0 auto;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-dim);
    margin-top: 20px;
}

/* About Section */
.about {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

/* Bento Grid Layout (2026 Trend) - Mobile First */
.bento-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* Tablet and up: 2-column layout */
@media (min-width: 768px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    .bento-large {
        grid-column: span 2;
    }
}

/* Desktop: 3-column layout with asymmetric grid */
@media (min-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .bento-large {
        grid-column: span 2;
        grid-row: span 2;
    }
}

.bento-item {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(168, 85, 247, 0.2);
    transition: all var(--duration-normal) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

/* Micro-interaction: Glow effect on hover */
.bento-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform var(--duration-normal) var(--ease-smooth);
}

.bento-item:hover::before {
    transform: scaleX(1);
}

.bento-item:hover {
    transform: translateY(-5px);
    border-color: var(--secondary-color);
    box-shadow: 0 10px 30px rgba(168, 85, 247, 0.3);
}

/* Large bento item styles */
.bento-large .bento-content h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    line-height: 1.3;
}

.bento-large .bento-content p {
    font-size: clamp(1rem, 2vw, 1.1rem);
    color: var(--text-dim);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

/* Small bento item styles */
.bento-item h4 {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.bento-item p {
    font-size: clamp(0.9rem, 1.5vw, 1rem);
    color: var(--text-dim);
    line-height: 1.6;
}

.feature-icon {
    font-size: clamp(2.5rem, 5vw, 3rem);
    margin-bottom: var(--spacing-md);
    display: block;
    animation: float-icon 3s ease-in-out infinite;
}

@keyframes float-icon {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Curriculum Section */
.curriculum {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--dark-bg) 0%, #1a1f3a 100%);
}

.lessons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.lesson-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    position: relative;
    overflow: hidden;
    transition: all 0.4s ease;
    border: 1px solid rgba(168, 85, 247, 0.1);
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.lesson-card:hover::before {
    transform: scaleX(1);
}

.lesson-card:hover {
    transform: translateY(-10px);
    border-color: var(--secondary-color);
    box-shadow: 0 15px 40px rgba(168, 85, 247, 0.3);
}

.lesson-number {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 50px;
    height: 50px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 900;
    color: white;
}

.lesson-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
    display: block;
}

.lesson-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-light);
}

.lesson-card p {
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 20px;
}

.lesson-tag {
    display: inline-block;
    background: rgba(168, 85, 247, 0.2);
    color: var(--secondary-color);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid var(--secondary-color);
}

.highlight-lesson {
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.2);
}

.highlight-lesson .lesson-number {
    background: var(--gradient-2);
}

.highlight-lesson .lesson-tag {
    background: rgba(0, 255, 136, 0.2);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Why Us Section */
.why-us {
    padding: 100px 0;
    background: var(--dark-bg);
}

.benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.benefit {
    text-align: center;
    padding: 30px;
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.benefit h4 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-light);
}

.benefit p {
    color: var(--text-dim);
    line-height: 1.8;
}

/* Details Section */
.details {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--dark-bg) 0%, #1a1f3a 100%);
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.detail-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all 0.3s ease;
}

.detail-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.detail-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.detail-card h4 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--accent-color);
}

.detail-card p {
    color: var(--text-dim);
    line-height: 1.8;
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background: var(--dark-bg);
}

.urgent {
    color: #ff6b6b !important;
    font-weight: 700;
    font-size: 1.3rem !important;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-info {
    background: var(--card-bg);
    padding: 50px;
    border-radius: 20px;
    text-align: center;
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 40px rgba(0, 255, 136, 0.2);
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.contact-details {
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 25px;
    padding: 20px;
    background: rgba(0, 255, 136, 0.05);
    border-radius: 15px;
    text-align: right;
}

.contact-icon {
    font-size: 2rem;
}

.contact-item strong {
    display: block;
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.contact-item p {
    color: var(--text-dim);
    font-size: 1.1rem;
}

.btn-large {
    font-size: 1.3rem;
    padding: 20px 50px;
}

/* Footer */
.footer {
    padding: var(--spacing-xl) 0 var(--spacing-md);
    background: #050814;
    color: var(--text-dim);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        text-align: right;
    }
}

.footer-brand h3 {
    font-size: 1.5rem;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--text-dim);
}

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

.footer-links a {
    color: var(--text-dim);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-smooth);
    font-size: 0.95rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 0.85rem;
}

/* Floating CTA Button (Mobile) */
.floating-cta {
    position: fixed;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    z-index: 9997;
    opacity: 0;
    transition: transform var(--duration-normal) var(--ease-smooth),
                opacity var(--duration-normal) var(--ease-smooth);
}

.floating-cta.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.floating-cta .btn {
    box-shadow: 0 4px 20px rgba(0, 255, 136, 0.4);
    animation: pulse-cta 2s ease-in-out infinite;
}

@keyframes pulse-cta {
    0%, 100% {
        box-shadow: 0 4px 20px rgba(0, 255, 136, 0.4);
    }
    50% {
        box-shadow: 0 4px 30px rgba(0, 255, 136, 0.6);
    }
}

/* Hide floating CTA on desktop */
@media (min-width: 1024px) {
    .floating-cta {
        display: none;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        min-height: 90vh;
        padding: 40px 0;
    }

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

    .subtitle {
        font-size: 1.5rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

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

    .about-features,
    .benefits,
    .details-grid {
        grid-template-columns: 1fr;
    }

    .contact-info {
        padding: 30px 20px;
    }

    .section-header h2 {
        font-size: 2rem;
    }
}

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

/* Selection Color */
::selection {
    background: var(--primary-color);
    color: var(--dark-bg);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-2);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}