:root {
    --bg: #f6f7f8;
    --surface: #ffffff;
    --ink: #1b1f24;
    --muted: #5d6670;
    --line: #e4e7eb;
    --accent: #1b1f24;
    --ok: #0f7b4a;
    --ok-bg: #e9f7ef;
    --bad: #b42318;
    --bad-bg: #fdeeee;
    --warn: #8a5a00;
    --warn-bg: #fff6e5;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
    background: var(--bg);
    color: var(--ink);
    font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

body {
    padding: 24px 20px 56px;
}

a {
    color: var(--ink);
    text-decoration: underline;
    text-underline-offset: 3px;
}

a:hover { color: #000; }

.top, main, footer {
    width: min(720px, 100%);
    margin: 0 auto;
}

.top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 40px;
}

.brand {
    color: var(--ink);
    font-weight: 650;
    text-decoration: none;
}

nav {
    display: flex;
    gap: 16px;
    font-size: 0.95rem;
}

nav a { text-decoration: none; color: var(--muted); }
nav a:hover { color: var(--ink); }

.hero h1 {
    margin: 0 0 8px;
    font-size: 1.6rem;
    font-weight: 650;
    letter-spacing: -0.02em;
}

.lede {
    margin: 0;
    color: var(--muted);
}

.panel, .doc-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 20px;
}

.panel { margin-top: 24px; }

.verify-form label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 0.9rem;
}

.field-row {
    display: flex;
    gap: 8px;
}

input[type="text"] {
    flex: 1;
    min-width: 0;
    padding: 11px 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    color: var(--ink);
    font: 14px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

input[type="text"]:focus {
    outline: 2px solid #1b1f24;
    outline-offset: 1px;
}

button {
    border: 0;
    border-radius: 8px;
    padding: 0 16px;
    background: var(--accent);
    color: #fff;
    font: 600 0.95rem/1 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    cursor: pointer;
}

button:hover { background: #000; }

.hint {
    margin: 10px 0 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.result {
    margin-top: 16px;
    padding: 14px 16px;
    border-radius: 8px;
}

.result.success { background: var(--ok-bg); }
.result.error { background: var(--bad-bg); }

.result-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.result p { margin: 6px 0 0; }

.status {
    margin-left: 8px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status.ok { color: var(--ok); }
.status.warn { color: var(--warn); }

dl {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 16px;
    margin: 0;
}

dt {
    color: var(--muted);
    font-size: 0.78rem;
}

dd {
    margin: 2px 0 0;
    font: 13px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.docs {
    display: grid;
    gap: 12px;
    margin-top: 24px;
}

.docs h2 {
    margin: 0 0 10px;
    font-size: 1.05rem;
}

.docs p {
    color: var(--muted);
}

.api-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.api-table th,
.api-table td {
    text-align: left;
    padding: 8px 0;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
}

.api-table th {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 600;
}

code, pre {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

code {
    font-size: 0.86em;
    background: #eef1f4;
    padding: 1px 5px;
    border-radius: 4px;
}

pre {
    overflow: auto;
    padding: 14px;
    border-radius: 8px;
    background: #f3f5f7;
    border: 1px solid var(--line);
    color: var(--ink);
    line-height: 1.5;
}

pre code {
    background: none;
    padding: 0;
    font-size: 0.82rem;
}

footer {
    margin-top: 40px;
    color: var(--muted);
    font-size: 0.85rem;
}

footer a { color: var(--muted); }

@media (max-width: 640px) {
    .top, .field-row, dl { display: block; }
    nav { gap: 12px; }
    button {
        width: 100%;
        height: 42px;
        margin-top: 8px;
    }
    dd { margin-bottom: 10px; }
}