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

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
    max-width: 1200px;
    margin: 20px auto;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

section {
    display: none; /* 默认隐藏所有section，通过JS控制显示 */
}

section.active {
    display: block;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: #333;
    color: #fff;
    position: relative;
    bottom: 0;
    width: 100%;
}

.domain-input-group {
    display: flex;
    margin-bottom: 20px;
}

.domain-input-group input {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
}

.domain-input-group button {
    padding: 10px 15px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

.domain-input-group button:hover {
    background-color: #0056b3;
}

#domain-list {
    list-style: none;
    padding: 0;
}

#domain-list li {
    background-color: #f9f9f9;
    border: 1px solid #eee;
    padding: 10px;
    margin-bottom: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#domain-list li .actions button {
    margin-left: 10px;
    padding: 5px 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#domain-list li .actions .edit-btn {
    background-color: #ffc107;
    color: #333;
}

#domain-list li .actions .edit-btn:hover {
    background-color: #e0a800;
}

#domain-list li .actions .delete-btn {
    background-color: #dc3545;
    color: #fff;
}

#domain-list li .actions .delete-btn:hover {
    background-color: #c82333;
}

.analysis-input-group {
    display: flex;
    margin-bottom: 20px;
}

.analysis-input-group select {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    margin-right: -1px; /* 避免双边框 */
}

.analysis-input-group button {
    padding: 10px 15px;
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

.analysis-input-group button:hover {
    background-color: #218838;
}

#analysis-results {
    margin-top: 20px;
    border: 1px solid #ddd;
    padding: 15px;
    background-color: #f9f9f9;
}

#analysis-output {
    white-space: pre-wrap;
    word-wrap: break-word;
}

.rank-tracking-input-group,
.setting-item {
    display: flex;
    margin-bottom: 15px;
    align-items: center;
}

.rank-tracking-input-group select,
.rank-tracking-input-group input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-right: 10px;
}

.rank-tracking-input-group button {
    padding: 10px 15px;
    background-color: #17a2b8;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.rank-tracking-input-group button:hover {
    background-color: #138496;
}

#rank-tracking-results {
    margin-top: 20px;
    border: 1px solid #ddd;
    padding: 15px;
    background-color: #f9f9f9;
}

#rank-output {
    white-space: pre-wrap;
    word-wrap: break-word;
}

.setting-item label {
    min-width: 180px; /* 确保标签宽度一致 */
    margin-right: 10px;
}

.setting-item input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

#save-settings-btn {
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 10px;
}

#save-settings-btn:hover {
    background-color: #0056b3;
}

#settings-status {
    margin-top: 10px;
    color: green;
    font-weight: bold;
}

#message-area {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    padding: 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    min-width: 300px;
}

#message-area.hidden {
    display: none;
}

#message-content {
    margin: 0;
    margin-right: 15px;
}

#close-message {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: #721c24;
}

#close-message:hover {
    color: #dc3545;
}

.chart-container {
    width: 100%;
    max-width: 800px;
    margin: 20px auto;
    background-color: #fff;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
}