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

:root {
    /* 色彩變數 */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --background-dark: #0f0f23;
    --background-light: #1a1a2e;
    --surface-color: #252542;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* 間距變數 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* 圓角變數 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

body {
    font-family: 'Segoe UI', 'Microsoft JhengHei', sans-serif;
    background-color: var(--background-dark);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* ========== 主容器 ========== */
.container {
    display: flex;
    width: 100vw;
    height: 100vh;
    position: relative;
}

/* ========== 3D 人物區域 ========== */
.avatar-section {
    width: 45%;
    min-width: 400px;
    background: linear-gradient(135deg, var(--background-dark) 0%, var(--surface-color) 100%);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

#avatar-canvas {
    width: 100%;
    height: 100%;
    outline: none;
}

/* 狀態指示器 */
.status-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(37, 37, 66, 0.9);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
}

.status-indicator .dot {
    width: 8px;
    height: 8px;
    background-color: var(--success-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.status-indicator .text {
    font-size: 0.875rem;
    color: var(--success-color);
}

/* ========== 對話區域 ========== */
.chat-section {
    width: 55%;
    min-width: 450px;
    display: flex;
    flex-direction: column;
    background-color: var(--background-light);
    border-left: 1px solid rgba(255, 255, 255, 0.05);
}

/* 標題列 */
.chat-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--surface-color);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* 🔧 新增：標題列內容佈局 */
.chat-header .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.chat-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========== 對話紀錄顯示框 ========== */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    scroll-behavior: smooth;
}

/* 自定義滾動條 */
.messages-container::-webkit-scrollbar {
    width: 6px;
}

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

.messages-container::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}

/* ========== 訊息樣式 ========== */
.message {
    display: flex;
    gap: var(--spacing-sm);
    animation: slideIn 0.3s ease-out;
    position: relative;  /* 🔧 新增：讓複製按鈕可以絕對定位 */
}

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

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

.avatar-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    background-color: var(--surface-color);
    flex-shrink: 0;
}

.message.user .avatar-icon {
    background-color: var(--primary-color);
}

.message-content {
    max-width: 70%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    line-height: 1.6;
}

.message:not(.user) .message-content {
    background-color: var(--surface-color);
    border-bottom-left-radius: var(--radius-sm);
}

.message.user .message-content {
    background-color: var(--primary-color);
    border-bottom-right-radius: var(--radius-sm);
}

.message-content p {
    margin-bottom: var(--spacing-xs);
    word-wrap: break-word;
}

.timestamp {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-align: right;
    display: block;
}

/* 🔧 新增：訊息操作按鈕（複製） */
.message-actions {
    position: relative;  /* 🔧 修正：改為相對定位，融入 flex 佈局 */
    display: flex;
    align-items: center;
    gap: 4px;
}

.copy-btn {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background-color: var(--surface-color);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    transition: all 0.2s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    opacity: 0;
}

.message:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background-color: var(--primary-color);
    transform: scale(1.1);
}

/* ========== 歡迎訊息特別樣式 ========== */
.welcome-message .message-content {
    background-color: rgba(99, 102, 241, 0.15);
    border-left: 3px solid var(--primary-color);
}

/* ========== 輸入區域 ========== */
.input-section {
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--surface-color);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--background-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Textarea */
#message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    padding: var(--spacing-sm) var(--spacing-md);
    resize: none;
    outline: none;
    max-height: 150px;
    line-height: 1.6;
}

#message-input::placeholder {
    color: var(--text-secondary);
}

/* ========== 按鈕樣式 ========== */
.voice-btn,
.send-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.voice-btn {
    background-color: transparent;
    color: var(--text-secondary);
}

.voice-btn:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.voice-btn.recording {
    background-color: var(--error-color) !important;
    color: white !important;
    animation: recordingPulse 1s infinite;
}

@keyframes recordingPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.send-btn {
    background-color: var(--primary-color);
    color: white;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.send-btn:active:not(:disabled) {
    transform: translateY(0);
}

.send-btn:disabled,
.voice-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========== 語音視覺化效果 ========== */
.voice-visualizer {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.voice-visualizer.active {
    display: flex;
}

.wave {
    width: 4px;
    height: 30px;
    background-color: var(--primary-color);
    border-radius: var(--radius-full);
    animation: waveAnimation 1s ease-in-out infinite;
}

.wave:nth-child(2) { animation-delay: 0.1s; }
.wave:nth-child(3) { animation-delay: 0.2s; }

@keyframes waveAnimation {
    0%, 100% { height: 15px; opacity: 0.6; }
    50% { height: 40px; opacity: 1; }
}

/* ========== 加載中提示 ========== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--background-dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    z-index: 9999;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay p {
    color: var(--text-secondary);
}

/* ========== AI 思考狀態 ========== */
.thinking-indicator {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-lg);
}

.thinking-indicator .dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary-color);
    border-radius: 50%;
    animation: thinkingBounce 1.4s infinite ease-in-out;
}

.thinking-indicator .dot:nth-child(2) {
    animation-delay: 0.2s;
}

.thinking-indicator .dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes thinkingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    25% { transform: translateY(-10px); }
}

/* ========== Toast 通知樣式 ========== */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast-message {
    background-color: var(--error-color);
    color: white;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    animation: slideInRight 0.3s ease-out;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

@keyframes slideInRight {
    from { 
        transform: translateX(100%); 
        opacity: 0; 
    }
    to { 
        transform: translateX(0); 
        opacity: 1; 
    }
}

/* ========== 響應式設計 ========== */
@media (max-width: 900px) {
    .container {
        flex-direction: column;
    }
    
    .avatar-section {
        width: 100%;
        height: 25vh;
        min-width: auto;
    }
    
    .chat-section {
        width: 100%;
        flex: 1;
        min-width: auto;
    }
}

/* ========== 工具提示樣式 ========== */
.tooltip {
    position: absolute;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tooltip.show {
    opacity: 1;
}