:root {
    --bg: #f6f7f9;
    --panel: #ffffff;
    --text: #1b1f24;
    --muted: #5b6470;
    --border: #d5dae1;
    --accent: #2f5bd0;
    --accent-text: #ffffff;
    --danger: #b3261e;
    --alert-bg: #fdecea;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14171b;
        --panel: #1d2126;
        --text: #e8ebef;
        --muted: #9aa4b1;
        --border: #353c45;
        --accent: #7da2ff;
        --accent-text: #10131a;
        --danger: #ff8a80;
        --alert-bg: #3a1f1d;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header,
main,
footer {
    max-width: 40rem;
    margin: 0 auto;
    padding: 1rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text);
    text-decoration: none;
}

.logo {
    flex: none;
}

.logo-bg {
    fill: var(--accent);
}

.logo-mark {
    fill: none;
    stroke: var(--accent-text);
    stroke-width: 2.25;
    stroke-linecap: round;
}

main {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
}

h1 {
    margin: 0 0 0.5rem;
    font-size: 1.5rem;
}

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

label {
    display: block;
    font-weight: 600;
    margin: 1rem 0 0.25rem;
}

textarea,
input[type="text"],
input[type="password"],
input[type="number"],
select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font: inherit;
}

textarea,
.copy input {
    font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
    font-size: 0.9rem;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0.75rem 0 0;
}

.copy {
    display: flex;
    gap: 0.5rem;
}

button {
    padding: 0.6rem 1rem;
    border: 1px solid var(--accent);
    border-radius: 6px;
    background: var(--accent);
    color: var(--accent-text);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

button.secondary {
    background: transparent;
    color: var(--accent);
}

button.danger {
    background: var(--danger);
    border-color: var(--danger);
    color: var(--panel);
}

button:disabled {
    opacity: 0.6;
    cursor: default;
}

.hint {
    color: var(--muted);
    font-size: 0.875rem;
    margin: 0.25rem 0 0;
}

.alert {
    background: var(--alert-bg);
    border: 1px solid var(--danger);
    border-radius: 6px;
    padding: 0.6rem 0.75rem;
}

a {
    color: var(--accent);
}

code {
    font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
    font-size: 0.9em;
}

footer {
    color: var(--muted);
    font-size: 0.875rem;
}

footer p {
    margin: 0;
}

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

footer a:hover,
footer a:focus-visible {
    color: var(--text);
}

.footer-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.5rem 1rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

footer nav {
    display: flex;
    flex-wrap: wrap;
}

footer nav a + a::before {
    content: "·";
    display: inline-block;
    margin: 0 0.5rem;
    color: var(--muted);
}

main h2 {
    margin: 1.5rem 0 0.5rem;
    font-size: 1.125rem;
}

main h3 {
    margin: 1.25rem 0 0.25rem;
    font-size: 1rem;
}

main ol,
main ul {
    padding-left: 1.25rem;
}

main li + li {
    margin-top: 0.25rem;
}

/* Corner ribbon that links to the public source code. */
.ribbon {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 10;
    width: 15rem;
    padding: 0.4rem 0;
    transform: translate(3.6rem, 2.6rem) rotate(45deg);
    transform-origin: center;
    background: var(--accent);
    color: var(--accent-text);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    letter-spacing: 0.02em;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

.ribbon:hover,
.ribbon:focus-visible {
    text-decoration: underline;
}

@media (max-width: 40rem) {
    .ribbon {
        display: none;
    }
}

@media (max-width: 30rem) {
    .grid {
        grid-template-columns: 1fr;
    }
}