:root
{
    --bg-color: #f0f2f5;
    --box-bg-color: rgba(255, 255, 255, 0.85);
    --text-color: #333;
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --input-border-color: #ccc;
    --title-gradient: linear-gradient(45deg, #007bff, #9d4edd);
    --sparkle-color-1: rgba(0, 123, 255, 0.7);
    --sparkle-color-2: rgba(157, 78, 221, 0.7);
    --message-error-color: #dc3545;
    --message-success-color: #28a745;
}

body.dark-mode
{
    --bg-color: #1a1a1d;
    --box-bg-color: rgba(31, 40, 51, 0.8);
    --text-color: #c5c6c7;
    --primary-color: #66fcf1;
    --primary-hover-color: #45a29e;
    --input-border-color: #45a29e;
    --title-gradient: linear-gradient(45deg, #66fcf1, #c77dff);
    --sparkle-color-1: rgba(102, 252, 241, 0.7);
    --sparkle-color-2: rgba(199, 125, 255, 0.7);
    --message-error-color: #ff4d4d;
    --message-success-color: #66fcf1;
}

@keyframes sparkle
{

    0%,
    100%
    {
        text-shadow: 0 0 10px var(--sparkle-color-1),
            0 0 20px var(--sparkle-color-1),
            2px -2px 15px var(--sparkle-color-2),
            -2px 2px 15px var(--sparkle-color-1);
        transform: scale(1);
    }

    50%
    {
        text-shadow: 0 0 15px var(--sparkle-color-2),
            0 0 25px var(--sparkle-color-2),
            2px 2px 20px var(--sparkle-color-1),
            -2px -2px 20px var(--sparkle-color-2);
        transform: scale(1.02);
    }
}

body,
html
{
    height: 100%;
    margin: 0;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: var(--text-color);
    overflow: hidden;
}

#particles-js
{
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    /* 将z-index设为-1, 确保在所有内容之下 */
    background-color: var(--bg-color);
    transition: background-color 0.3s;
}

.container
{
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
}

.login-box
{
    background: var(--box-bg-color);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 15px 25px rgba(0, 0, 0, .2);
    width: 320px;
    transition: background-color 0.3s, box-shadow 0.3s;
    border: 1px solid var(--input-border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 标题样式: 渐变色和发光动画 */
h1.title,
.app-title
{
    margin: 0 0 30px;
    padding: 0;
    text-align: center;
    font-size: 2.8em;
    font-weight: 500;
    letter-spacing: 4px;
    cursor: pointer;
    /* 保持可点击以触发JS效果 */
    position: relative;

    /* 渐变文本实现 */
    background: var(--title-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    filter: drop-shadow(0 0 5px rgba(0, 0, 0, 0.2));

    /* 粒子发光动画 */
    animation: sparkle 6s infinite linear;
}

.app-title
{
    font-size: 1.8rem;
    margin-bottom: 0;
    /* 修正头部标题的边距 */
}

.input-group
{
    position: relative;
    margin-bottom: 30px;
}

.input-group input
{
    width: 100%;
    padding: 10px 0;
    font-size: 16px;
    color: var(--text-color);
    border: none;
    border-bottom: 2px solid var(--input-border-color);
    outline: none;
    background: transparent;
}

.input-group label
{
    position: absolute;
    top: 0;
    left: 0;
    padding: 10px 0;
    font-size: 16px;
    color: var(--text-color);
    opacity: 0.7;
    pointer-events: none;
    transition: .5s;
}

.input-group input:focus~label,
.input-group input:valid~label
{
    top: -20px;
    left: 0;
    color: var(--primary-color);
    font-size: 12px;
}

button
{
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 5px;
    background: var(--primary-color);
    color: var(--box-bg-color);
    /* 修正按钮文本颜色以确保对比度 */
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 20px;
}

button:hover
{
    background: var(--primary-hover-color);
}

.theme-switch-wrapper
{
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 2;
}

.theme-switch
{
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
}

.theme-switch input
{
    display: none;
}

.slider
{
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
}

.slider:before
{
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 26px;
}

input:checked+.slider
{
    background-color: var(--primary-color);
}

input:checked+.slider:before
{
    transform: translateX(26px);
}

.slider.round
{
    border-radius: 34px;
}

.slider.round:before
{
    border-radius: 50%;
}

.message-area
{
    text-align: center;
    margin-top: 20px;
    height: 20px;
    font-weight: bold;
}

.form-switcher
{
    text-align: center;
    margin-top: 25px;
    font-size: 14px;
}

.form-switcher a
{
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
}

.form-switcher a:hover
{
    text-decoration: underline;
}

.form-container
{
    position: relative;
    z-index: 1;
    perspective: 1000px;
}

#main-app
{
    flex-direction: column;
    max-width: 1000px;
    width: 100%;
    height: 100%;
    padding: 1rem;
    box-sizing: border-box;
}

.app-header
{
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
    box-sizing: border-box;
    flex-shrink: 0;
}

.user-profile
{
    display: flex;
    align-items: center;
    gap: 1rem;
}

#logout-button
{
    padding: 8px 16px;
    background: var(--primary-color);
    color: var(--bg-color);
    /* 修正按钮文本颜色 */
}

.tabs
{
    width: 100%;
    border-bottom: 2px solid var(--input-border-color);
    margin-top: 1rem;
    flex-shrink: 0;
}

.tab-link
{
    padding: 1rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-color);
    opacity: 0.6;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tab-link.active
{
    opacity: 1;
    border-bottom: 3px solid var(--primary-color);
}

.tab-content
{
    width: 100%;
    flex-grow: 1;
    overflow: hidden;
    position: relative;
}

.tab-pane
{
    width: 100%;
    height: 100%;
    position: absolute;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s;
}

.tab-pane.active
{
    visibility: visible;
    opacity: 1;
}

#chat
{
    display: flex;
}

.chat-container
{
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--box-bg-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 8px;
    margin-top: 1rem;
    overflow: hidden;
    border: 1px solid var(--input-border-color);
}

.chat-messages
{
    flex-grow: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message
{
    padding: 0.75rem 1rem;
    border-radius: 18px;
    max-width: 70%;
    display: flex;
    flex-direction: column;
}

.message-sender
{
    font-weight: bold;
    font-size: 0.8rem;
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.message-content
{
    word-wrap: break-word;
}

.chat-message.sent
{
    background-color: var(--primary-color);
    color: var(--bg-color);
    /* 修正发送消息的文本颜色 */
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.chat-message.sent .message-sender
{
    color: var(--bg-color);
    opacity: 0.8;
}

.chat-message.received
{
    background-color: var(--bg-color);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.chat-form
{
    display: flex;
    padding: 1rem;
    border-top: 1px solid var(--input-border-color);
    gap: 1rem;
}

#chat-input
{
    flex-grow: 1;
    padding: 0.75rem;
    border: 1px solid var(--input-border-color);
    border-radius: 20px;
    background: var(--bg-color);
    color: var(--text-color);
    outline: none;
}

#chat-input:focus
{
    border-color: var(--primary-color);
}

.chat-form button
{
    margin-top: 0;
    padding: 0.75rem 1.5rem;
    border-radius: 20px;
}

/* 手机端适配 */
@media (max-width: 768px)
{
    #main-app
    {
        padding: 0.5rem;
    }

    h1.title,
    .app-title
    {
        font-size: 2.2em;
        /* 调整移动端标题大小 */
        animation-duration: 8s;
        /* 减缓移动端动画 */
    }

    .app-title
    {
        font-size: 1.5rem;
    }

    #username-display
    {
        display: none;
    }

    .tab-link
    {
        padding: 0.75rem;
        font-size: 0.9rem;
    }

    .chat-container
    {
        margin-top: 0.5rem;
        border-radius: 0;
    }

    .chat-messages
    {
        padding: 0.5rem;
    }

    .chat-form
    {
        padding: 0.5rem;
        gap: 0.5rem;
    }

    #logout-button
    {
        font-size: 0.8rem;
        padding: 6px 10px;
    }
}