html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

.container-fluid {
    padding-left: 15px;
    padding-right: 15px;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.navbar {
    background-color: #00BFFF !important; /* !important 保证覆盖默认类 */
}

.navbar .nav-link {
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 10px; /* 圆角按钮 */
    padding: 0.4rem 1rem;
    color: black !important;
    transition: all 0.2s ease-in-out;
}

.navbar .nav-link:hover {
    background-color: #0099FF; /* 悬停更深蓝色 */
    color: white !important;
}

.navbar .nav-link.active {
    background-color: #0099FF; /* 与 hover 一致，表示选中 */
    color: white !important;
}

.navbar .navbar-collapse .nav-link {
    margin: 0.2rem; /* 控制折叠时间距 */
}

.navbar .dropdown-menu {
    border-radius: 8px;
    padding: 0.3rem;
    background-color: #ffffff;
    border: 1px solid #0099FF;
}

.navbar .dropdown-item {
    border-radius: 6px;
    padding: 0.4rem 1rem;
    color: black;
    transition: all 0.2s ease-in-out;
}

.navbar .dropdown-item:hover {
    background-color: #0099FF;
    color: white;
}

.chat-body {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1rem 0;
    background-color: #f8f9fa;
}

.chat-body .row {
    margin-left: 0;
    margin-right: 0;
}

.chat-body .col-md-6 {
    padding-left: 0;
    padding-right: 0;
}

.chat-message {
    max-width: 100%;
    padding: 0.75rem;
    border-radius: 0.5rem;
}

.chat-message p {
    margin: 0;
}

.chat-message img {
    max-width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: contain;
    border-radius: 0.25rem;
    margin: 0.25rem 0;
}

.chat-message h1 {
    font-size: 1.6em;
}

.chat-message h2 {
    font-size: 1.4em;
}

.chat-message h3 {
    font-size: 1.2em;
}

.chat-message.user {
    background-color: #0da9fd;
    color: white;
}

.chat-message.bot {
    background-color: #e9ecef;
    color: #212529;
}

.chat-footer {
    padding: 1rem 0;
    background-color: #ffffff;
    border-top: 1px solid #dee2e6;
}

.chat-input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ced4da;
    border-radius: 0.5rem;
    resize: none;
    overflow-y: auto;
    min-height: calc(1.5em * 3 + 1rem);
    max-height: calc(1.5em * 12 + 1rem);
    line-height: 1.5em;
}