:root {
    --bg: #f4f5f7;
    --card: #ffffff;
    --text: #1d2129;
    --muted: #6b7280;
    --border: #d9dce1;
    --accent: #2563eb;
    --accent-text: #ffffff;
    --ok-bg: #e7f6ec;
    --ok-border: #a7d8b8;
    --warn-bg: #fff7e0;
    --warn-border: #edd08a;
    --error-bg: #fdeaea;
    --error-border: #f0a9a9;
    --code-bg: #f1f3f5;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14171c;
        --card: #1c2027;
        --text: #e6e8eb;
        --muted: #9aa3b0;
        --border: #313742;
        --accent: #4f8cff;
        --accent-text: #0d1117;
        --ok-bg: #16281d;
        --ok-border: #2f5a3f;
        --warn-bg: #2a2413;
        --warn-border: #5c4c1c;
        --error-bg: #2b1718;
        --error-border: #5f2b2d;
        --code-bg: #12151a;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 32px 16px;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.card {
    max-width: 680px;
    margin: 0 auto;
    padding: 28px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.card-head { margin-bottom: 22px; }

.card-head h1 { margin: 0; font-size: 1.35rem; letter-spacing: -0.01em; }

.card-head h1 a { color: inherit; text-decoration: none; }

.lead { margin: 6px 0 0; color: var(--muted); font-size: 0.95rem; }

label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    font-weight: 600;
}

textarea, select, input[type="text"] {
    width: 100%;
    padding: 11px 12px;
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
}

textarea {
    resize: vertical;
    min-height: 160px;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 0.95rem;
}

textarea:focus, select:focus, input:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

select { margin-bottom: 18px; }

.hint { margin: 6px 0 18px; color: var(--muted); font-size: 0.85rem; }

.btn {
    display: inline-block;
    padding: 11px 18px;
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    font: inherit;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}

.btn:hover { border-color: var(--accent); }

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
}

.alert {
    margin: 0 0 18px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
}

.alert p { margin: 0 0 6px; }
.alert p:last-child { margin-bottom: 0; }

.alert-ok { background: var(--ok-bg); border-color: var(--ok-border); }
.alert-warn { background: var(--warn-bg); border-color: var(--warn-border); }
.alert-error { background: var(--error-bg); border-color: var(--error-border); }

.linkbox { display: flex; gap: 8px; margin-bottom: 18px; }
.linkbox input { font-family: ui-monospace, Consolas, monospace; font-size: 0.9rem; }
.linkbox .btn { flex: 0 0 auto; }

.notes { margin: 0 0 22px; padding-left: 20px; color: var(--muted); font-size: 0.9rem; }
.notes li { margin-bottom: 6px; }

.secret {
    margin: 0 0 18px;
    padding: 16px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 0.95rem;
    white-space: pre-wrap;
    word-break: break-word;
}

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; }

.foot {
    max-width: 680px;
    margin: 18px auto 0;
    color: var(--muted);
    font-size: 0.82rem;
    text-align: center;
}

.foot p { margin: 0; }

@media (max-width: 520px) {
    body { padding: 16px; }
    .card { padding: 20px; }
    .linkbox { flex-direction: column; }
}