:root {
    --bg: #f7f7fb;
    --card: #ffffff;
    --border: #dcdce6;
    --text: #1f1f2e;
    --muted: #6b6b80;
    --accent: #2f6f4f;
    --accent-dark: #234f38;
    --error: #b3261e;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

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

header.site a.brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--accent-dark);
    text-decoration: none;
}

header.site nav a {
    margin-left: 1rem;
    color: var(--text);
    text-decoration: none;
    font-size: 0.95rem;
}

main {
    max-width: 640px;
    margin: 2.5rem auto;
    padding: 0 1rem;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.75rem;
}

h1 { font-size: 1.4rem; margin-top: 0; }

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

input[type=text], input[type=email], input[type=password], textarea, select {
    width: 100%;
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
}

button, .btn {
    display: inline-block;
    margin-top: 1.3rem;
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
}

button:hover, .btn:hover { background: var(--accent-dark); }

.muted { color: var(--muted); font-size: 0.88rem; }

.error {
    background: #fbeceb;
    border: 1px solid var(--error);
    color: var(--error);
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-top: 1rem;
}

.success {
    background: #eaf5ee;
    border: 1px solid var(--accent);
    color: var(--accent-dark);
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-top: 1rem;
}

.choices { display: flex; gap: 1rem; margin-top: 1.5rem; }
.choices .card { flex: 1; text-align: center; }

footer.site {
    max-width: 640px;
    margin: 2.5rem auto 1.5rem;
    padding: 0 1rem;
    text-align: center;
    color: var(--muted);
    font-size: 0.85rem;
}
footer.site a { color: var(--muted); }

details summary { cursor: pointer; color: var(--accent-dark); font-weight: 600; }