:root {
    font-family: system-ui, Segoe UI, Roboto, Arial, sans-serif;
}

body {
    margin: 0;
    background: #f6f7fb;
    color: #0f172a;
}

.page {
    max-width: 920px;
    margin: 0 auto;
    padding: 24px;
}

header {
    display: flex;
    gap: 24px;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.brand {
    margin: 0;
    font-weight: 700;
}

nav a {
    margin-right: 12px;
    text-decoration: none;
    color: #334155;
}

    nav a:hover {
        text-decoration: underline;
    }

.card {
    background: white;
    padding: 16px;
    border-radius: 14px;
    box-shadow: 0 2px 10px rgba(0,0,0,.05);
}

input {
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid #cbd5e1;
    min-width: 280px;
}

button {
    padding: 8px 12px;
    border: 0;
    border-radius: 10px;
    background: #0ea5e9;
    color: white;
    cursor: pointer;
}

    button:hover {
        filter: brightness(1.05);
    }

.error {
    background: #fee2e2;
    border: 1px solid #ef4444;
    padding: 12px;
    border-radius: 12px;
}

.success {
    background: #dcfce7;
    border: 1px solid #22c55e;
    padding: 12px;
    border-radius: 12px;
}

.hint {
    color: #475569;
    font-size: .95rem;
}

footer {
    margin-top: 24px;
    color: #64748b;
}