/* ===================================
   彩俰F5 - 主樣式表
   極簡深色主題
   =================================== */

/* CSS 變數定義 - 極簡深色主題 */
:root {
    /* 主色調 - 深藍紫系 */
    --primary: #2D5873;
    --primary-light: #3d7296;
    --primary-dark: #1d3a4d;
    
    /* 背景色 - 純色，無漸層 */
    --bg-primary: #020D01;
    --bg-secondary: #071504;
    --bg-tertiary: #0c1f08;
    --bg-elevated: #112608;
    --bg-hover: #173210;
    --bg-active: #1d3e18;
    
    /* 強調背景 */
    --bg-accent: #010440;
    
    /* 文字色 */
    --text-primary: #e8eef2;
    --text-secondary: #9FB0BF;
    --text-tertiary: #6b8494;
    --text-inverse: #020D01;
    
    /* 邊框色 */
    --border-color: #2D5873;
    --border-light: #3d7296;
    --border-dark: #1d3a4d;
    
    /* 強調色 */
    --accent-primary: #9FB0BF;
    --accent-cyan: #5ba3c9;
    --accent-emerald: #4ead7a;
    --accent-amber: #c9a85b;
    --accent-rose: #c95b7a;
    
    /* 訊息氣泡色 - 純色 */
    --msg-user-bg: #010440;
    --msg-assistant-bg: #071504;
    
    /* 陰影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.6);
    
    /* 間距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 圓角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 動畫 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* 側邊欄寬度 */
    --sidebar-width: 280px;
}

/* ===================================
   基礎重設
   =================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow: hidden;
}

/* ===================================
   應用程式容器
   =================================== */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    background: var(--bg-primary);
}

/* ===================================
   側邊欄
   =================================== */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    z-index: 100;
}

.sidebar.hidden {
    transform: translateX(-100%);
    opacity: 0;
    position: absolute;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

#closeSidebar {
    display: none;
}

.new-chat-btn {
    margin: var(--spacing-md);
    width: calc(100% - var(--spacing-md) * 2);
}

/* 區塊標題 */
.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 對話歷史列表 */
.chat-history {
    flex: 1;
    overflow-y: auto;
    padding-bottom: var(--spacing-md);
}

.chat-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0 var(--spacing-sm);
}

.chat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    color: var(--text-secondary);
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.chat-item.active {
    background: var(--bg-active);
    color: var(--text-primary);
    border-left: 3px solid var(--accent-cyan);
}

.chat-item-icon {
    flex-shrink: 0;
    opacity: 0.6;
}

.chat-item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-item-delete {
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.chat-item:hover .chat-item-delete {
    opacity: 1;
}

/* 側邊欄底部 */
.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.btn-settings {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-settings:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* ===================================
   主內容區
   =================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100vh;
    position: relative;
}

/* 頂部導航 */
.main-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
}

#menuBtn {
    display: none;
}

.model-selector {
    flex: 1;
}

.model-selector select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    cursor: pointer;
    min-width: 150px;
}

.model-selector select:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

/* 模型標籤顯示 */
.model-label {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-accent);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* ===================================
   聊天區域
   =================================== */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    position: relative;
}

/* 捲動到底部浮動按鈕 */
.scroll-to-bottom-btn {
    position: absolute;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    
    color: var(--text-secondary);
    cursor: pointer;
    
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    
    transition: opacity var(--transition-normal), visibility var(--transition-normal), 
                background var(--transition-fast), border-color var(--transition-fast);
}

.scroll-to-bottom-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

.scroll-to-bottom-btn:active {
    transform: translateX(-50%) scale(0.95);
}

.scroll-to-bottom-btn.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* 歡迎畫面 */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl);
    animation: fadeIn 0.5s ease;
}

.welcome-screen.hidden {
    display: none;
}

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

.welcome-icon {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-accent);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.welcome-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.welcome-icon svg {
    color: var(--accent-primary);
}

.welcome-screen h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--accent-cyan);
}

.welcome-screen p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.quick-prompts {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    max-width: 500px;
}

.quick-prompt-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quick-prompt-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

/* 訊息列表 */
.messages {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    contain: layout style;
}

/* 訊息項目 */
.message {
    display: flex;
    gap: var(--spacing-md);
    animation: messageIn 0.3s ease;
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.message-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.message.user .message-avatar {
    background: var(--bg-accent);
}

.message.assistant .message-avatar {
    background: var(--bg-tertiary);
}

.message-avatar svg {
    width: 20px;
    height: 20px;
    color: var(--accent-primary);
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.message-role {
    font-weight: 600;
    font-size: 0.875rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.message-body {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    line-height: 1.7;
    min-height: 1.7em;
    contain: content;
}

.message.user .message-body {
    background: var(--msg-user-bg);
    color: var(--text-primary);
}

.message.assistant .message-body {
    background: var(--msg-assistant-bg);
    border: 1px solid var(--border-color);
}

/* Markdown 樣式 */
.message-body p {
    margin-bottom: var(--spacing-sm);
}

.message-body p:last-child {
    margin-bottom: 0;
}

.message-body pre {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
    border: 1px solid var(--border-color);
}

.message-body code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

.message-body :not(pre) > code {
    background: rgba(45, 88, 115, 0.3);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    color: var(--accent-cyan);
}

.message-body ul, .message-body ol {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.message-body li {
    margin-bottom: var(--spacing-xs);
}

.message-body blockquote {
    border-left: 3px solid var(--accent-cyan);
    padding-left: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    color: var(--text-secondary);
}

.message-body h1, .message-body h2, .message-body h3, 
.message-body h4, .message-body h5, .message-body h6 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.message-body a {
    color: var(--accent-cyan);
    text-decoration: none;
}

.message-body a:hover {
    text-decoration: underline;
}

.message-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-sm) 0;
}

.message-body th, .message-body td {
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    text-align: left;
}

.message-body th {
    background: var(--bg-tertiary);
}

/* 打字指示器 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(1) { animation-delay: 0s; }
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-4px); opacity: 1; }
}

/* ===================================
   輸入區域
   =================================== */
.input-area {
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
    background: var(--bg-primary);
}

.system-prompt-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-accent);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    font-size: 0.8125rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.system-prompt-bar.hidden {
    display: none;
}

.system-prompt-label {
    color: var(--accent-cyan);
    flex-shrink: 0;
    font-weight: 500;
}

.system-prompt-text {
    flex: 1;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
    transition: border-color var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-cyan);
}

.input-wrapper textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.5;
    resize: none;
    max-height: 200px;
    min-height: 24px;
    padding: var(--spacing-sm) 0;
    font-family: inherit;
}

.input-wrapper textarea::placeholder {
    color: var(--text-tertiary);
}

.input-wrapper textarea:focus {
    outline: none;
}

/* ===================================
   按鈕樣式
   =================================== */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-icon-small {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon-small:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    background: var(--primary-light);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
}

.btn-danger {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent-rose);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-danger:hover {
    filter: brightness(1.1);
}

.btn-send, .btn-stop {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-send:hover:not(:disabled) {
    background: var(--primary-light);
}

.btn-send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-stop {
    background: var(--accent-rose);
}

.btn-stop:hover {
    filter: brightness(1.1);
}

/* ===================================
   Modal 對話框
   =================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(2, 13, 1, 0.9);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-normal);
}

.modal.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-small .modal-content {
    max-width: 400px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* 設定表單元素 */
.setting-group {
    margin-bottom: var(--spacing-lg);
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.setting-group input[type="text"],
.setting-group input[type="password"],
.setting-group select,
.setting-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-family: inherit;
    transition: border-color var(--transition-fast);
}

.setting-group input:focus,
.setting-group select:focus,
.setting-group textarea:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

.setting-group textarea {
    resize: vertical;
    min-height: 100px;
}

.setting-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: var(--spacing-sm);
    accent-color: var(--accent-cyan);
}

.setting-group label:has(input[type="checkbox"]) {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.setting-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

.api-key-input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
}

.api-key-input-wrapper input {
    flex: 1;
}

/* 版本資訊 */
.version-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.version-info span:last-child {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-cyan);
    font-weight: 500;
}

/* 參數區塊標題 */
.param-section-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

/* GPT-5.1 專屬參數區塊 */
.gpt5-params {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.gpt5-params .param-section-title {
    color: var(--accent-cyan);
}

.gpt5-params .param-group:last-child {
    margin-bottom: 0;
}

/* 參數滑桿 */
.param-group {
    margin-bottom: var(--spacing-lg);
}

.param-group label {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.param-group label span {
    color: var(--accent-cyan);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.param-group input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    outline: none;
    -webkit-appearance: none;
}

.param-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.param-group input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-light);
}

/* ===================================
   Toast 通知
   =================================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 2000;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
    max-width: 350px;
}

.toast.success {
    border-left: 4px solid var(--accent-emerald);
}

.toast.error {
    border-left: 4px solid var(--accent-rose);
}

.toast.info {
    border-left: 4px solid var(--accent-cyan);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(20px); }
}

.toast.hiding {
    animation: toastOut 0.3s ease forwards;
}

/* ===================================
   工具類別
   =================================== */
.hidden {
    display: none !important;
}

/* 滾動條樣式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ===================================
   響應式設計
   =================================== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    #closeSidebar {
        display: flex;
    }
    
    #menuBtn {
        display: flex;
    }
    
    .main-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .scroll-to-bottom-btn {
        bottom: 90px;
    }
    
    .chat-container {
        padding: var(--spacing-md);
    }
    
    .input-area {
        padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
    }
    
    .message {
        gap: var(--spacing-sm);
    }
    
    .message-avatar {
        width: 32px;
        height: 32px;
    }
    
    .welcome-screen h2 {
        font-size: 1.5rem;
    }
    
    .quick-prompts {
        flex-direction: column;
        align-items: stretch;
    }
    
    .modal-content {
        width: 95%;
        max-height: 85vh;
    }
    
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }
    
    .toast {
        max-width: none;
    }
}

/* ===================================
   列印樣式
   =================================== */
@media print {
    .sidebar,
    .main-header,
    .input-area,
    .modal {
        display: none !important;
    }
    
    .main-content {
        display: block;
    }
    
    .chat-container {
        overflow: visible;
        height: auto;
    }
    
    .message-body {
        break-inside: avoid;
    }
}