* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.header p {
    font-size: 1.1em;
    opacity: 0.9;
    margin-bottom: 15px;
}

.nav {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.nav-btn {
    padding: 8px 16px;
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 5px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s;
}

.nav-btn:hover {
    background: #667eea;
    color: white;
    border-color: #667eea;
}


.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2.5em;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 5px;
}

.stat-label {
    color: #666;
    font-size: 0.9em;
}

.view-switcher {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.view-btn {
    padding: 10px 20px;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
}

.view-btn.active {
    background: #667eea;
    color: white;
}

.view-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.chat-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 20px;
    height: 70vh;
}

.sidebar {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    overflow-y: auto;
}

.sidebar h3 {
    margin-bottom: 15px;
    color: #333;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.group-list {
    list-style: none;
    margin-bottom: 20px;
}

.group-item {
    padding: 15px;
    margin-bottom: 10px;
    background: #f8f9fa;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.group-item:hover {
    background: #e9ecef;
    transform: translateX(5px);
}

.group-item.active {
    background: #667eea;
    color: white;
    border-left-color: #764ba2;
}

.group-name {
    font-weight: bold;
    margin-bottom: 5px;
}

.group-info {
    font-size: 0.8em;
    color: #666;
    display: flex;
    justify-content: space-between;
}

.group-item.active .group-info {
    color: rgba(255, 255, 255, 0.8);
}

.chat-area {
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
    background: #f8f9fa;
    border-radius: 12px 12px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.current-group {
    font-size: 1.2em;
    font-weight: bold;
    color: #333;
}

.group-stats {
    font-size: 0.9em;
    color: #666;
}

.controls {
    padding: 20px;
    border-bottom: 1px solid #eee;
    background: #f8f9fa;
    border-radius: 0 0 0 0;
    text-align: center;
}

.load-more {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1em;
    transition: transform 0.3s ease;
}

.load-more:hover {
    transform: scale(1.05);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 20px;
}

.message {
    margin-bottom: 20px;
    display: flex;
    align-items: flex-start;
}

.message.own {
    flex-direction: row-reverse;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    margin: 0 10px;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 18px;
    background: #f1f3f5;
    position: relative;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
}

.message.own .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message-sender {
    font-weight: bold;
    margin-bottom: 5px;
    font-size: 0.9em;
}

.message-time {
    font-size: 0.8em;
    color: #999;
    margin-top: 5px;
}

.message.own .message-time {
    color: rgba(255, 255, 255, 0.8);
}

.loading {
    text-align: center;
    padding: 20px;
    color: #666;
}

.error {
    background: #ffe6e6;
    color: #d63031;
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
    text-align: center;
}

@media (max-width: 768px) {
    .chat-container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .message-content {
        max-width: 85%;
    }
}

body, .container {
    overflow-x: hidden;
}

/* 聊天记录按钮样式 */
.chatrecord-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 15px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s ease;
    text-align: left;
    max-width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
}

.chatrecord-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 15px;
    width: 80%;
    max-width: 800px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    animation: slideIn 0.3s;
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.3em;
}

.close {
    color: white;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.3s;
}

.close:hover {
    opacity: 0.7;
}

.modal-body {
    padding: 0;
    max-height: calc(80vh - 80px);
    overflow-y: auto;
}

.chat-record-content {
    padding: 20px;
}

.chat-record-item {
    margin-bottom: 15px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.chat-record-sender {
    font-weight: bold;
    margin-bottom: 5px;
    color: #333;
}

.chat-record-text {
    margin-bottom: 5px;
    line-height: 1.4;
}

.chat-record-time {
    font-size: 0.8em;
    color: #666;
    text-align: right;
}

.chat-record-image {
    max-width: 200px;
    max-height: 200px;
    border-radius: 8px;
    margin: 5px 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.container {
    max-width: 100%;
    overflow-x: hidden;
}