:root {
    color-scheme: dark;
    --bg: #060a13;
    --card: #0f1624;
    --accent: #4169e1; /* royal blue */
    --accent-strong: #223e5c; /* dark pastel blue */
    --text: #f0f4ff;
    --muted: #a7b4d6;
    --border: #1c2537;
    --shadow: 0 20px 45px rgba(4, 9, 20, 0.55);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family:
        "Fira Sans",
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    background: radial-gradient(
            circle at top,
            rgba(65, 105, 225, 0.18),
            rgba(0, 3, 8, 0)
        )
        no-repeat var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.corner-icons {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    gap: 0.75rem;
    z-index: 1000;
}

.corner-icon {
    width: 2.6rem;
    height: 2.6rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: rgba(15, 22, 36, 0.75);
    border: 1px solid rgba(65, 105, 225, 0.35);
    color: var(--text);
    text-decoration: none;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        border-color 0.2s ease;
    box-shadow: 0 10px 25px rgba(6, 10, 19, 0.4);
}

.corner-icon svg {
    width: 1.2rem;
    height: 1.2rem;
}

.corner-icon:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: 0 15px 30px rgba(6, 10, 19, 0.55);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.hero {
    max-width: 900px;
    margin: 0 auto;
    padding: 7rem 2rem 4rem;
    text-align: center;
}

.hero-diagram {
    margin: 2.5rem auto 2rem;
    max-width: 900px;
}

.hero-diagram img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 18px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    background: rgba(15, 22, 36, 0.65);
    padding: 1rem;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: clamp(2.4rem, 5vw, 3.8rem);
    margin: 0 0 1rem;
}

.lead {
    font-size: 1.1rem;
    color: var(--muted);
    margin-bottom: 2rem;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.6rem;
    border-radius: 999px;
    font-weight: 600;
    text-decoration: none;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), #274bdb);
    color: #f7f9ff;
    box-shadow: var(--shadow);
}

.btn.secondary {
    border: 1px solid rgba(65, 105, 225, 0.45);
    color: var(--accent);
    background: transparent;
}

.btn:hover {
    transform: translateY(-2px);
}

main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem 5rem;
}

.section {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.section h2 {
    margin-top: 0;
    font-size: 1.8rem;
}

.built-on h2 {
    text-align: center;
}

.project-list {
    list-style: disc;
    max-width: 720px;
    margin: 1.5rem auto 0;
    padding-left: 1.5rem;
}

.project-list li {
    margin-bottom: 0.5rem;
}

.project-list p {
    margin: 0.15rem 0 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.section ul {
    padding-left: 1.2rem;
}

.section li {
    margin-bottom: 0.8rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    background: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.8rem;
    box-shadow: var(--shadow);
}

.get-started ol {
    padding-left: 1.2rem;
}

.note {
    margin-top: 1.5rem;
    font-size: 0.95rem;
    color: var(--muted);
}

footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--muted);
    font-size: 0.9rem;
}

@media (max-width: 640px) {
    .hero {
        padding-top: 4rem;
    }

    .hero-diagram {
        margin: 2rem auto 1.5rem;
    }

    .hero-diagram img {
        padding: 0.75rem;
        border-radius: 14px;
    }

    .section {
        padding: 2rem 1.5rem;
    }
}