body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #e8eef6;
    color: #333;
}

header {
    background-color: #1d538d;
    color: white;
    padding: 20px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 28px;
}

nav {
    background-color: #3a7bc8;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-size: 16px;
}

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

/* ── Flexbox page centering ──────────────────────────────── */
.page-center {
    min-height: calc(100vh - 200px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 20px;
}

/* ── Card ────────────────────────────────────────────────── */
.card {
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
    padding: 40px 48px;
    width: 100%;
    max-width: 520px;
}

.card h2 {
    text-align: center;
    color: #1d538d;
    margin-top: 0;
    margin-bottom: 28px;
    font-size: 24px;
}

/* ── Form groups ─────────────────────────────────────────── */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-weight: bold;
    font-size: 14px;
    color: #555;
    margin-bottom: 6px;
}

.form-group input {
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 10px 14px;
    font-size: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus {
    border-color: #4a90d9;
    box-shadow: 0 0 4px rgba(74, 144, 217, 0.35);
}

/* ── Validation error ────────────────────────────────────── */
.form-error {
    color: #c0392b;
    background-color: #fdecea;
    border: 1px solid #f1aaa4;
    border-radius: 4px;
    padding: 10px 14px;
    font-size: 14px;
    margin-bottom: 14px;
}

/* ── Button row ──────────────────────────────────────────── */
.btn-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 24px;
}

.btn {
    display: inline-block;
    padding: 10px 22px;
    font-size: 15px;
    border-radius: 5px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    font-family: Arial, sans-serif;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: #1d538d;
    color: white;
}

.btn-primary:hover {
    background-color: #174676;
}

.btn-secondary {
    background-color: #4a90d9;
    color: white;
}

.btn-secondary:hover {
    background-color: #3a7bc8;
}

footer {
    background-color: #1d538d;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 0;
}