/* styles.css */
body {
    font-family: 'Roboto', sans-serif;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fafafa;
    color: #212121;
}

.header {
    overflow: hidden;
    background-color: #fff;
    padding: 20px 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14), 0 3px 1px -2px rgba(0,0,0,0.12), 0 1px 5px 0 rgba(0,0,0,0.2);
}

.header a {
    float: left;
    color: #212121;
    text-align: center;
    padding: 12px;
    text-decoration: none;
    font-size: 18px;
    line-height: 25px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.header a.logo {
    font-size: 25px;
    font-weight: bold;
}

.header a:hover {
    background-color: #eee;
    color: #212121;
}

.header a.active {
    background-color: #1a73e8;
    color: white;
}

.header-right {
    float: right;
}

@media screen and (max-width: 500px) {
    .header a {
        float: none;
        display: block;
        text-align: left;
    }
    .header-right {
        float: none;
    }
}

.container {
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14), 0 3px 1px -2px rgba(0,0,0,0.12), 0 1px 5px 0 rgba(0,0,0,0.2);
    border-radius: 4px;
}

.btn {
    background-color: #1a73e8;
    border: none;
    color: white;
    padding: 8px 16px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
    margin: 4px 2px;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #1765cc;
}

.btn-delete {
    background-color: #f44336;
}

.btn-delete:hover {
    background-color: #d32f2f;
}

.error {
    color: red;
}

.success {
    color: green;
}

.search-form {
    margin-bottom: 20px;
}

.loader {
    border: 16px solid #f3f3f3;
    border-top: 16px solid #1a73e8;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -60px;
    margin-left: -60px;
    display: none;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 按钮点击动画 */
button:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}