body {
    font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    background: #f6f8fa;
    color: #17202a;
    padding: 24px;
}

.card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 6px 24px rgba(20, 30, 40, 0.06);
    max-width: 900px;
    margin: 24px auto;
}

h1 {
    margin: 0 0 8px;
    font-size: 24px;
}

p.lead {
    margin: 0 0 16px;
    color: #586069;
}

label {
    display: block;
    margin: 12px 0 6px;
    font-weight: 600;
}

textarea {
    width: 100%;
    min-height: 140px;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #e1e4e8;
    resize: vertical;
    font-size: 14px;
}

input[type="text"],
input[type="checkbox"] {
    font-size: 14px;
}

.controls {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 12px;
}

button {
    background: #0366d6;
    color: #fff;
    border: 0;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.muted {
    color: #6a737d;
    font-size: 13px;
}

pre {
    background: #0b1221;
    color: #d6e6ff;
    padding: 12px;
    border-radius: 8px;
    overflow: auto;
    max-height: 320px;
}

.alert {
    padding: 10px 12px;
    border-radius: 8px;
    margin-top: 12px;
}

.alert.error {
    background: #ffeef0;
    color: #86181d;
    border: 1px solid #f0b7bd;
}

.alert.success {
    background: #effcf6;
    color: #055160;
    border: 1px solid #b8f0db;
}

.small {
    font-size: 13px;
    color: #6a737d;
}

.hint {
    font-size: 13px;
    color: #586069;
    margin-top: 6px;
}

.row {
    display: flex;
    gap: 12px;
}

.col {
    flex: 1;
}

.spinner {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-top-color: rgba(255, 255, 255, 1);
    animation: spin .9s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}