body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
    color: #333;
}

.container {
    max-width: 1100px;
    width: calc(100% - 60px);
    margin: 30px auto;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 12px rgba(0,0,0,.10);
}

nav {
    background: #002b55;
    padding: 15px;
}

nav strong,
nav a {
    color: white;
    text-decoration: none;
    margin-right: 20px;
    font-weight: bold;
}

nav a:hover,
nav a.active {
    color: #ffd54f;
}

h1 {
    color: #002b55;
    margin-top: 0;
}

h2 {
    color: #444;
}

h3 {
    color: #002b55;
}

hr {
    border: none;
    border-top: 1px solid #ddd;
    margin: 25px 0;
}

.registry-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0 25px 0;
}

.registry-table th {
    background: #002b55;
    color: white;
    padding: 10px;
    text-align: left;
}

.registry-table td {
    border: 1px solid #ddd;
    padding: 10px;
}

.registry-table tr:nth-child(even) {
    background: #f7f9fb;
}

.card {
    background: #ffffff;
    border-radius: 14px;
    padding: 26px;
    margin-top: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.book-card {
    background: #f9fbfd;
    border: 1px solid #d9e2ec;
    border-left: 6px solid #002b55;
    padding: 20px;
    margin: 22px 0;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,.08);
}

.book-card h3 {
    margin-top: 0;
    color: #002b55;
}

.book-card p {
    margin: 8px 0;
}

.action-button,
.small-button,
.button-link {
    display: inline-block;
    background: #002b55;
    color: white !important;
    padding: 10px 16px;
    margin: 8px 8px 8px 0;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
}

.small-button {
    padding: 6px 10px;
    font-size: 13px;
}

.action-button:hover,
.small-button:hover,
.button-link:hover {
    background: #004080;
    color: white !important;
}

input[type=text],
input[type=email],
select,
textarea {
    width: 400px;
    max-width: 100%;
    padding: 10px;
    border: 1px solid #bbb;
    border-radius: 4px;
    box-sizing: border-box;
}

button,
input[type=submit] {
    padding: 10px 18px;
    background: #002b55;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    border-radius: 4px;
}

button:hover,
input[type=submit]:hover {
    background: #004080;
}

.footer {
    margin-top: 50px;
    text-align: center;
    color: #666;
    font-size: 14px;
}

@media (max-width: 700px) {
    .container {
        width: calc(100% - 30px);
        padding: 18px;
        margin: 15px auto;
    }

    nav a,
    nav strong {
        display: inline-block;
        margin-bottom: 8px;
    }

    .action-button,
    .small-button,
    .button-link {
        display: block;
        width: fit-content;
    }
}