html, body {
    margin: 0;
    font-family: "Segoe UI", system-ui, sans-serif;
    background: linear-gradient(180deg, #f5f0e7 0%, #f0e7d6 100%);
    color: #2a2116;
}

a {
    color: #0d5aa7;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    min-height: 2.5rem;
    padding: 0.6rem 1rem;
    border: 1px solid transparent;
    border-radius: 0.75rem;
    font: inherit;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-primary {
    background: #1f4e79;
    border-color: #1f4e79;
    color: #fffaf2;
}

.btn-primary:hover {
    background: #183d5f;
    border-color: #183d5f;
}

.btn-secondary {
    background: #fffaf2;
    border-color: #c9b79d;
    color: #5f4a33;
}

.btn-secondary:hover {
    background: #f1e7d7;
    border-color: #bda587;
}

.shell {
    min-height: 100vh;
}

.shell-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, #1f4e79, #284b63);
    color: #fffaf2;
}

.shell-header h1 {
    margin: 0;
    font-size: 1.5rem;
}

.shell-header p {
    margin: 0.25rem 0 0;
    opacity: 0.88;
}

.shell-nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.shell-nav a {
    color: #fffaf2;
    text-decoration: none;
    font-weight: 600;
}

.shell-main {
    max-width: 1180px;
    margin: 0 auto;
    padding: 2rem;
}

.hero-card,
.sample-card,
.runtime-card {
    padding: 1.5rem;
    border-radius: 1rem;
    background: #fffaf2;
    border: 1px solid #e0d2bc;
    box-shadow: 0 12px 30px rgba(55, 38, 18, 0.08);
}

.hero-card h1,
.sample-card h2 {
    margin-top: 0;
}

.hybrid-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.sample-card {
    min-height: 100%;
}

.runtime-meta {
    margin-top: 0;
    color: #6c5841;
    font-size: 0.92rem;
}

.runtime-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin: 1rem 0;
}

.runtime-card-server {
    background: linear-gradient(180deg, #fffaf2 0%, #faf0de 100%);
}

.runtime-card-wasm {
    background: linear-gradient(180deg, #f3f8ff 0%, #edf4ff 100%);
}

@media (max-width: 900px) {
    .hybrid-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 700px) {
    .shell-header {
        padding: 1.25rem;
        align-items: flex-start;
        flex-direction: column;
    }

    .shell-main {
        padding: 1rem;
    }
}