body {
    margin: 0;
    background: #f4f6f8;
    color: #1f2933;
    font-family: Segoe UI, Arial, sans-serif;
    font-size: 14px;
}

a { color: #0f5e9c; text-decoration: none; }
a:hover { text-decoration: underline; }

.shell {
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px 24px 48px;
}

.topbar {
    background: #0f2f4a;
    color: #fff;
    border-bottom: 4px solid #17a07a;
}

.topbar .inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    font-size: 19px;
    font-weight: 700;
}

.nav a {
    color: #dbeafe;
    margin-left: 18px;
    font-weight: 600;
}

.hero {
    margin-bottom: 22px;
}

.hero h1 {
    margin: 0 0 8px;
    font-size: 30px;
    color: #102a43;
}

.hero p {
    margin: 0;
    color: #52616b;
}

.panel {
    background: #fff;
    border: 1px solid #d9e2ec;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 18px;
    box-shadow: 0 1px 2px rgba(16, 42, 67, .04);
}

.panel h2 {
    margin: 0 0 16px;
    font-size: 19px;
    color: #102a43;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(220px, 1fr));
    gap: 14px 18px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(220px, 1fr));
    gap: 16px;
}

.card-link {
    display: block;
    background: #fff;
    border: 1px solid #d9e2ec;
    border-radius: 8px;
    padding: 18px;
    min-height: 96px;
    box-shadow: 0 1px 2px rgba(16, 42, 67, .04);
}

.card-link strong {
    display: block;
    color: #102a43;
    font-size: 17px;
    margin-bottom: 8px;
}

.card-link span {
    color: #52616b;
    line-height: 1.45;
}

.field label {
    display: block;
    font-weight: 700;
    color: #334e68;
    margin-bottom: 5px;
}

input, select, textarea {
    box-sizing: border-box;
    width: 100%;
    min-height: 36px;
    border: 1px solid #bcccdc;
    border-radius: 6px;
    background: #fff;
    padding: 7px 9px;
    font: inherit;
}

textarea {
    min-height: 96px;
    resize: vertical;
}

button, input[type=submit] {
    width: auto;
    border: 0;
    background: #0f5e9c;
    color: #fff;
    font-weight: 700;
    border-radius: 6px;
    padding: 10px 18px;
    cursor: pointer;
}

button:hover, input[type=submit]:hover {
    background: #0b4f84;
}

.actions {
    margin-top: 18px;
}

.alert {
    max-width: 1180px;
    margin: 20px auto;
    padding: 14px 18px;
    border-radius: 8px;
    font-weight: 700;
}

.error {
    background: #fff1f0;
    border: 1px solid #ffb4ab;
    color: #9f1b1b;
}

.result-panel pre, pre {
    white-space: pre-wrap;
    overflow: auto;
    max-height: 520px;
    background: #102a43;
    color: #e6f6ff;
    border-radius: 6px;
    padding: 14px;
}

.hint {
    color: #627d98;
    font-size: 13px;
}

@media (max-width: 860px) {
    .grid, .cards {
        grid-template-columns: 1fr;
    }

    .topbar .inner {
        display: block;
    }

    .nav {
        margin-top: 10px;
    }

    .nav a {
        display: inline-block;
        margin: 0 14px 8px 0;
    }
}