body {
    margin: 0;
    background: #f5f7fb;
    color: #1b1f2a;
    font-family: "Segoe UI", Arial, sans-serif;
}

.app-container {
    width: min(960px, calc(100% - 32px));
    margin: 0 auto;
}

.app-header {
    border-bottom: 1px solid #dde3ee;
    background: #ffffff;
}

.app-brand {
    display: inline-block;
    padding: 18px 0;
    color: #1b1f2a;
    text-decoration: none;
    font-weight: 700;
}

.app-main {
    padding: 32px 0;
}

.starter {
    padding: 24px;
    border: 1px solid #dde3ee;
    border-radius: 12px;
    background: #ffffff;
}

.starter h1 {
    margin: 0 0 12px;
    font-size: 28px;
}

.starter p {
    margin: 0;
    line-height: 1.5;
}