* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0d1420;
    --bg-secondary: #161d2b;
    --bg-card: #1a2332;
    --text-primary: #f5f7fa;
    --text-secondary: #9ca3af;
    --accent-cyan: #06b6d4;
    --accent-blue: #3b82f6;
    --border: #2d3748;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(13, 20, 32, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.nav-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.nav-btn:hover {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

.mobile-menu {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: url('hero-bg.jpg') center/cover;
    text-align: center;
    padding: 2rem;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(13, 20, 32, 0.8), rgba(13, 20, 32, 0.5), var(--bg-primary));
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 900px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.gradient-text {
    display: block;
    margin-top: 0.5rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 1.75rem;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--accent-cyan);
    animation: bounce 2s infinite;
}

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

/* Extensions Section */
.extensions {
    padding: 5rem 1rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.extensions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.extension-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.5rem;
    transition: var(--transition);
}

.extension-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(6, 182, 212, 0.2);
}

.card-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.extension-icon {
    width: 64px;
    height: 64px;
    border-radius: 0.75rem;
    transition: var(--transition);
}

.extension-card:hover .extension-icon {
    transform: scale(1.1);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.card-content {
    margin-bottom: 1.5rem;
}

.features-title {
    color: var(--accent-cyan);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.features-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.features-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.features-list li::before {
    content: "▸";
    color: var(--accent-cyan);
    margin-top: 0.125rem;
}

.card-footer {
    display: flex;
    gap: 0.75rem;
}

.btn-download {
    flex: 1;
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-icon:hover {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

/* Tutorial Section */
.tutorial {
    padding: 5rem 1rem;
    background: var(--bg-secondary);
}

.tutorial-video {
    max-width: 900px;
    margin: 0 auto 3rem;
}

.video-placeholder {
    aspect-ratio: 16/9;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.video-placeholder:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(6, 182, 212, 0.2);
}

.video-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(59, 130, 246, 0.1));
    opacity: 0;
    transition: var(--transition);
}

.video-placeholder:hover .video-overlay {
    opacity: 1;
}

.video-play {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    z-index: 10;
}

.play-button {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(6, 182, 212, 0.2);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
    transition: var(--transition);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.video-placeholder:hover .play-button {
    transform: scale(1.1);
}

.video-text {
    font-size: 1.25rem;
    font-weight: 600;
}

.tutorial-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
}

.step-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

/* Footer */
.footer {
    padding: 3rem 1rem;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-info {
    max-width: 300px;
}

.footer-text {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition);
}

.social-link:hover {
    background: rgba(6, 182, 212, 0.2);
    color: var(--accent-cyan);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in {
    animation: slideIn 0.6s ease-out;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu {
        display: flex;
    }
    
    .hero {
        padding-top: 6rem;
    }
    
    .extensions-grid,
    .tutorial-steps {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-info {
        max-width: 100%;
    }
}