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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.chat-container {
    width: 100%;
    max-width: 800px;
    height: 90vh;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h1 {
    font-size: 20px;
    font-weight: 600;
}

.new-chat-button {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.new-chat-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.new-chat-button:active {
    transform: translateY(0);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    background: #f7f9fc;
}

.message {
    margin-bottom: 20px;
    display: flex;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 12px;
    line-height: 1.6;
    word-wrap: break-word;
}

.message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
    background: white;
    color: #333;
    border: 1px solid #e5e7eb;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.message.assistant.typing .message-content {
    display: flex;
    align-items: center;
    padding: 16px 20px;
}

.typing-indicator {
    display: flex;
    gap: 4px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #667eea;
    animation: bounce 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-indicator span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.chat-input-container {
    padding: 20px 24px;
    background: white;
    border-top: 1px solid #e5e7eb;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: #f7f9fc;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    padding: 8px 12px;
    transition: border-color 0.2s;
}

.input-wrapper:focus-within {
    border-color: #667eea;
}

.chat-input {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    outline: none;
    font-size: 15px;
    line-height: 1.5;
    max-height: 120px;
    font-family: inherit;
    color: #333;
}

.chat-input::placeholder {
    color: #9ca3af;
}

.send-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    transform: scale(1.05);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-button:active:not(:disabled) {
    transform: scale(0.95);
}

.voice-button {
    background: transparent;
    color: #667eea;
    border: none;
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.voice-button:hover {
    background: rgba(102, 126, 234, 0.1);
}

.voice-button:active {
    transform: scale(0.95);
}

.voice-button.listening {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    animation: pulse 1.5s infinite;
}

/* 自动播放按钮 */
.auto-play-button {
    background: transparent;
    color: #667eea;
    border: none;
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.auto-play-button:hover {
    background: rgba(102, 126, 234, 0.1);
}

.auto-play-button:active {
    transform: scale(0.95);
}

.auto-play-button.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.message-audio-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.audio-play-button {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    border: none;
    border-radius: 6px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.audio-play-button:hover {
    background: rgba(102, 126, 234, 0.2);
}

.audio-play-button.playing {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.welcome-message {
    text-align: left;
}

/* 滚动条样式 */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #9ca3af;
}

/* 提示消息 */
.toast-message {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    color: #333;
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    animation: slideDown 0.3s ease-out;
    max-width: 90%;
    text-align: center;
}

.toast-message.toast-error {
    background: linear-gradient(135deg, #f56565 0%, #c53030 100%);
    color: white;
}

.toast-message.toast-success {
    background: linear-gradient(135deg, #48bb78 0%, #2f855a 100%);
    color: white;
}

.toast-message.toast-warning {
    background: linear-gradient(135deg, #f6ad55 0%, #dd6b20 100%);
    color: white;
}

.toast-message.fade-out {
    animation: slideUp 0.3s ease-out;
    opacity: 0;
}

@keyframes slideDown {
    from {
        transform: translateX(-50%) translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    to {
        transform: translateX(-50%) translateY(-100%);
        opacity: 0;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 0;
    }

    .chat-container {
        max-width: 100%;
        height: 100vh;
        border-radius: 0;
    }

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