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

:root {
    --bg-dark: #0a1628;
    --bg-card: #132240;
    --bg-card-hover: #1a2d52;
    --accent: #00bcd4;
    --accent-hover: #00e5ff;
    --text: #e0e6ed;
    --text-muted: #8899aa;
    --text-heading: #ffffff;
    --border: #1e3a5f;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
}

h1, h2, h3 {
    color: var(--text-heading);
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 22, 40, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-logo img {
    display: block;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-heading);
}

.nav-github {
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.nav-github:hover {
    border-color: var(--accent);
}

/* Hero */
.hero {
    padding: 140px 0 60px;
    text-align: center;
}

.hero-logo {
    width: 120px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 540px;
    margin: 0 auto 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: #000;
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #000;
}

.btn-secondary {
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--text-heading);
}

/* Screenshot Carousel */
.screenshot {
    padding: 20px 0 80px;
    text-align: center;
}

.carousel {
    position: relative;
    max-width: 100%;
}

.carousel-track {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.carousel-slide {
    width: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.carousel-slide.active {
    position: relative;
    opacity: 1;
}

.carousel-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 16px;
}

.carousel-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: border-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.carousel-dots {
    display: flex;
    gap: 8px;
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 1px solid var(--text-muted);
    background: transparent;
    cursor: pointer;
    padding: 0;
    transition: all 0.2s;
}

.carousel-dot.active {
    background: var(--accent);
    border-color: var(--accent);
}

/* Features */
.features {
    padding: 80px 0;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 48px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    transition: border-color 0.2s;
}

.feature-card:hover {
    border-color: var(--accent);
}

.feature-icon {
    font-size: 1.8rem;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Demo */
.demo {
    padding: 80px 0;
}

.demo h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 48px;
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.demo-item h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

.demo-item video {
    width: 100%;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #000;
}

/* Getting Started */
.getting-started {
    padding: 80px 0;
}

.getting-started h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 48px;
}

.steps {
    max-width: 640px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: #000;
    font-weight: 700;
    font-size: 1.1rem;
    border-radius: 50%;
}

.step h3 {
    font-size: 1.05rem;
    margin-bottom: 4px;
}

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

/* Download */
.download {
    padding: 80px 0;
}

.download h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 8px;
}

.download-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 720px;
    margin: 0 auto 24px;
}

.download-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    text-align: center;
    transition: border-color 0.2s, transform 0.2s;
}

.download-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    color: var(--text);
}

.download-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.download-card h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.download-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.download-note {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 40px 0;
    margin-top: 40px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.footer-left p {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-style: italic;
    margin-top: 8px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }

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

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

    .download-grid {
        grid-template-columns: 1fr;
        max-width: 300px;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
    }

    .footer-links {
        flex-direction: column;
        gap: 12px;
    }

    .nav-links {
        gap: 12px;
    }

    .nav-links a {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 40px;
    }

    .hero-logo {
        width: 80px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .nav-links a:not(.nav-github) {
        display: none;
    }
}