:root {
    --ink: #0e1116;
    --panel: #11161d;
    --panel2: #0c1117;
    --line: #2c3540;
    --text: #f3f7fb;
    --muted: #8b98a5;
    --green: #2ecc71;
    --green-d: #27ad60;
    --red: #e5645b;
    --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    background: radial-gradient(900px 500px at 50% -10%, #16212c 0%, transparent 60%), var(--ink);
    color: var(--text);
    font-family: var(--sans);
    padding: 20px 14px 40px;
}

.card {
    width: 100%;
    max-width: 440px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 20px;
}

h1 {
    font-size: 20px;
    margin: 0 0 16px;
}

.resp-h {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.04em;
    margin: 0 0 8px;
}

.resp {
    margin: 0 0 20px;
    background: var(--panel2);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 14px;
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.55;
    white-space: pre-wrap;
    word-break: break-word;
    min-height: 80px;
    max-height: 300px;
    overflow: auto;
    color: #d6e2ec;
}

.resp.err {
    color: var(--red);
}

.details {
    background: var(--panel2);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 4px 14px;
    margin-bottom: 18px;
}

.details .row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 14px;
    padding: 9px 0;
    border-bottom: 1px solid #1a212a;
    font-size: 14px;
}

.details .row:last-child {
    border-bottom: none;
}

.details .k {
    color: var(--muted);
    flex: none;
}

.details .v {
    font-family: var(--mono);
    text-align: right;
    word-break: break-word;
}

.details .v.big {
    color: var(--green);
    font-weight: 700;
    font-size: 16px;
}

label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: #b6c2cd;
    margin: 0 0 6px;
}

input {
    width: 100%;
    background: #1b232d;
    border: 1px solid var(--line);
    color: var(--text);
    font-family: var(--mono);
    font-size: 16px;
    padding: 12px;
    border-radius: 9px;
    outline: none;
    margin-bottom: 14px;
}

input:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 2px rgba(46, 204, 113, .18);
}

.btn {
    width: 100%;
    background: var(--green);
    color: #06180e;
    font-size: 16px;
    font-weight: 700;
    border: none;
    border-radius: 10px;
    padding: 15px;
    cursor: pointer;
    margin-top: 4px;
}

.btn:hover {
    background: var(--green-d);
}

.btn:disabled {
    opacity: .5;
    cursor: default;
}

@media (max-width: 460px) {
    body {
        padding: 12px 10px 32px;
    }

    .card {
        padding: 16px;
        border-radius: 12px;
    }

    h1 {
        font-size: 18px;
    }

    .details .row {
        font-size: 13px;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}