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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.section {
    padding: 30px;
}

.hidden {
    display: none;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

h2 {
    color: #333;
    font-size: 1.2em;
    margin-bottom: 15px;
}

h3 {
    color: #666;
    font-size: 1em;
    margin-bottom: 10px;
    padding: 10px 20px;
    background: #f5f5f5;
    border-bottom: 1px solid #ddd;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

input[type="text"] {
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

button {
    padding: 12px 24px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #5568d3;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-small {
    padding: 6px 12px;
    font-size: 14px;
}

.status-info {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 15px;
}

.status-info p {
    margin: 5px 0;
    color: #666;
}

.status-info span {
    color: #333;
    font-weight: bold;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e0e0e0;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 500px;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 6px;
    margin-bottom: 15px;
}

.message {
    margin-bottom: 15px;
    padding: 10px;
    background: white;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.message.own {
    background: #e3f2fd;
    margin-left: 20px;
}

.message-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 12px;
    color: #666;
}

.message-content {
    color: #333;
    word-wrap: break-word;
}

.input-area {
    display: flex;
    gap: 10px;
}

.input-area input {
    flex: 1;
}

.log-section {
    border-top: 2px solid #e0e0e0;
}

.log-container {
    max-height: 200px;
    overflow-y: auto;
    padding: 15px;
    background: #f8f9fa;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}

.log-entry {
    margin-bottom: 5px;
    padding: 5px;
    border-left: 3px solid #667eea;
    padding-left: 10px;
}

.log-entry.error {
    border-left-color: #e74c3c;
    color: #e74c3c;
}

.log-entry.success {
    border-left-color: #27ae60;
    color: #27ae60;
}

.log-entry.info {
    border-left-color: #3498db;
    color: #3498db;
}

/* 滾動條樣式 */
.messages::-webkit-scrollbar,
.log-container::-webkit-scrollbar {
    width: 6px;
}

.messages::-webkit-scrollbar-track,
.log-container::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.messages::-webkit-scrollbar-thumb,
.log-container::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 3px;
}

.messages::-webkit-scrollbar-thumb:hover,
.log-container::-webkit-scrollbar-thumb:hover {
    background: #555;
}