:root {
    color-scheme: light dark;
    --bg: #0f1419;
    --card: #1a2330;
    --text: #e8eef5;
    --muted: #93a4b8;
    --accent: #3d8bfd;
    --danger: #f07178;
    --border: #2b3a4d;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Segoe UI, system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.header nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.brand {
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
}

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

.content {
    max-width: 28rem;
    margin: 3rem auto;
    padding: 0 1rem;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

label {
    display: block;
    margin: 0.75rem 0 0.35rem;
    color: var(--muted);
}

input[type=email],
input[type=password],
input[type=text] {
    width: 100%;
    padding: 0.6rem 0.7rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
}

button, .button {
    margin-top: 1rem;
    width: 100%;
    padding: 0.7rem;
    border: 0;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

.errors { color: var(--danger); }
.muted { color: var(--muted); }