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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: #0f1419;
    color: #e7e9ea;
    min-height: 100vh;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 24px;
}

/* Hero */
.hero {
    text-align: center;
    margin-bottom: 60px;
}

.logo {
    width: 120px;
    height: auto;
    margin-bottom: 16px;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.tagline {
    font-size: 1.2rem;
    color: #8b98a5;
    margin-bottom: 32px;
}

.btn-demo {
    display: inline-block;
    background: #4ade80;
    color: #0f1419;
    padding: 14px 36px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.2s, background 0.2s;
}

.btn-demo:hover {
    background: #22c55e;
    transform: translateY(-2px);
}

/* Preview */
.preview {
    margin-bottom: 60px;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.preview-grid img {
    width: 100%;
    border-radius: 12px;
    border: 1px solid #2f3336;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: #2f3336;
    margin-bottom: 60px;
}

.feature {
    background: #0f1419;
    padding: 32px 24px;
    position: relative;
    transition: background 0.3s;
}

.feature::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.08) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.3s;
}

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

.feature:hover {
    background: #111921;
}

.feature h3 {
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #8b98a5;
    margin-bottom: 8px;
    position: relative;
    transition: color 0.3s;
}

.feature:hover h3 {
    color: #4ade80;
}

.feature p {
    color: #e7e9ea;
    font-size: 1rem;
    line-height: 1.5;
    position: relative;
}

/* CTA */
.cta {
    text-align: center;
}

.btn-github {
    display: inline-block;
    background: transparent;
    color: #e7e9ea;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    border: 1px solid #2f3336;
    transition: border-color 0.2s, background 0.2s;
}

.btn-github:hover {
    border-color: #4ade80;
    background: rgba(74, 222, 128, 0.1);
}

/* Responsive */
@media (max-width: 640px) {
    main {
        padding: 40px 16px;
    }

    h1 {
        font-size: 2.2rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .preview-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

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