:root {
    --bg: #f4f5f7;
    --card: #ffffff;
    --text: #1f2328;
    --muted: #59636e;
    --border: #d0d7de;
    --primary: #3f51b5;
    --primary-text: #ffffff;
    --error: #b42318;
    --ok: #1a7f37;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #101214;
        --card: #1b1f24;
        --text: #e6edf3;
        --muted: #9198a1;
        --border: #3d444d;
        --primary: #7986cb;
        --primary-text: #101214;
        --error: #ff7b72;
        --ok: #3fb950;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 48px 16px;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
    width: 100%;
    max-width: 400px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px;
}

.brand { margin-bottom: 24px; font-weight: 700; font-size: 20px; }
.brand a { color: var(--text); text-decoration: none; }

h1 { font-size: 22px; margin: 0 0 16px; }
p { margin: 0 0 16px; }
a { color: var(--primary); }
.muted { color: var(--muted); font-size: 14px; }

form { display: flex; flex-direction: column; gap: 12px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; font-weight: 600; }
label.check { flex-direction: row; align-items: center; gap: 8px; font-weight: 400; }

input[type=email], input[type=password], input[type=text] {
    font: inherit;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--card);
    color: var(--text);
}

button {
    font: inherit;
    font-weight: 600;
    padding: 10px 12px;
    border: 0;
    border-radius: 6px;
    background: var(--primary);
    color: var(--primary-text);
    cursor: pointer;
}

.errors { color: var(--error); font-size: 14px; }
.errors ul { margin: 0; padding-left: 20px; }
.validation-summary-valid { display: none; }
.field-validation-error { color: var(--error); font-size: 13px; font-weight: 400; }
.notice { border-left: 3px solid var(--primary); padding: 8px 12px; background: color-mix(in srgb, var(--primary) 8%, transparent); }
.ok { color: var(--ok); }
.links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 16px; font-size: 14px; }