:root {
    color-scheme: light dark;
    --bg: #f5f6f8;
    --fg: #1a1d21;
    --muted: #6a7280;
    --card: #ffffff;
    --border: #e3e6ea;
    --accent: #1f5fff;
    --error: #c62828;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --fg: #e7e9ec;
        --muted: #9aa1ac;
        --card: #1a1d22;
        --border: #2a2e35;
        --accent: #6c8cff;
        --error: #ff6b6b;
    }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--fg);
}
.topbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 24px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
}
.brand { font-weight: 600; letter-spacing: 0.2px; }
.container { max-width: 760px; margin: 32px auto; padding: 0 16px; }
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.login-card { max-width: 380px; margin: 64px auto; }
h1 { margin: 0 0 16px; font-size: 22px; }
label { display: block; margin: 12px 0; font-size: 14px; color: var(--muted); }
input[type=text], input[type=password] {
    display: block; width: 100%; margin-top: 4px;
    padding: 10px 12px;
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 15px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
    margin-top: 12px;
    padding: 10px 16px;
    background: var(--accent);
    color: #fff;
    border: 0; border-radius: 6px;
    font-weight: 500; cursor: pointer;
}
button:hover { filter: brightness(1.05); }
button.link {
    background: transparent; color: var(--accent); padding: 0;
    font-weight: 500;
}
.error {
    color: var(--error);
    background: rgba(198, 40, 40, 0.08);
    border: 1px solid rgba(198, 40, 40, 0.3);
    border-radius: 6px;
    padding: 8px 12px;
    margin: 0 0 12px;
    font-size: 14px;
}
.muted { color: var(--muted); font-size: 13px; }
.logout-form { display: flex; align-items: center; gap: 12px; margin: 0; }
.user { color: var(--muted); font-size: 14px; }