:root {
    color-scheme: light dark;
    --bg: #f5f6f8;
    --card: #ffffff;
    --text: #1c1e21;
    --muted: #5f6672;
    --accent: #2563eb;
    --danger: #b91c1c;
    --border: #d9dde3;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14161a;
        --card: #1e2126;
        --text: #e8eaed;
        --muted: #9aa2ad;
        --accent: #5b8def;
        --danger: #f08c8c;
        --border: #333842;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", system-ui, sans-serif;
}

.site-header {
    width: 100%;
    max-width: 28rem;
    padding: 2rem 1rem 1rem;
}

.brand {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.card {
    width: 100%;
    max-width: 28rem;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
    margin: 0 1rem;
}

.site-footer {
    padding: 1.5rem;
    color: var(--muted);
    font-size: 0.85rem;
}

h1 { font-size: 1.3rem; margin-top: 0; }

label { display: block; margin: 1rem 0 0.3rem; font-weight: 600; font-size: 0.9rem; }

input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
}

button {
    margin-top: 1.4rem;
    width: 100%;
    padding: 0.65rem;
    border: none;
    border-radius: 6px;
    background: var(--accent);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

button:hover { filter: brightness(1.08); }

.muted { color: var(--muted); font-size: 0.9rem; }

.error { color: var(--danger); font-size: 0.9rem; margin: 0.5rem 0 0; }

.links { margin-top: 1.2rem; font-size: 0.9rem; }

.links a { color: var(--accent); text-decoration: none; }

dl.account { margin: 0; }
dl.account dt { font-weight: 600; margin-top: 0.9rem; font-size: 0.85rem; color: var(--muted); }
dl.account dd { margin: 0.15rem 0 0; }