:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --text: #1b2430;
    --muted: #5d6b7c;
    --border: #d5dce4;
    --accent: #0b5cff;
    --accent-text: #ffffff;
    --error-bg: #fde8e8;
    --error-text: #9b1c1c;
    --ok-bg: #e6f4ea;
    --ok-text: #1e6b34;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #11161c;
        --card: #1a212a;
        --text: #e8edf3;
        --muted: #9aa8b8;
        --border: #2d3743;
        --accent: #4d8dff;
        --accent-text: #0a1220;
        --error-bg: #3a1c1c;
        --error-text: #ffb4b4;
        --ok-bg: #173323;
        --ok-text: #9be3b4;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 16px;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

.card {
    width: 100%;
    max-width: 400px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px 24px;
}

.brand { margin: 0 0 4px; font-size: 1.1rem; color: var(--muted); font-weight: 600; letter-spacing: .02em; }
h2 { margin: 0 0 16px; font-size: 1.5rem; }

label { display: block; margin-top: 14px; font-weight: 600; font-size: .9rem; }

input {
    width: 100%;
    margin-top: 6px;
    padding: 10px 12px;
    font: inherit;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
}
input:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

button {
    width: 100%;
    margin-top: 20px;
    padding: 11px 14px;
    font: inherit;
    font-weight: 600;
    color: var(--accent-text);
    background: var(--accent);
    border: 0;
    border-radius: 8px;
    cursor: pointer;
}
button:disabled { opacity: .6; cursor: progress; }
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }

a { color: var(--accent); }
.switch { margin: 18px 0 0; color: var(--muted); font-size: .9rem; }

.message { margin: 14px 0 0; padding: 10px 12px; border-radius: 8px; background: var(--ok-bg); color: var(--ok-text); }
.message.error { background: var(--error-bg); color: var(--error-text); }

.details { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 0; }
.details dt { color: var(--muted); }
.details dd { margin: 0; overflow-wrap: anywhere; }

[hidden] { display: none !important; }