/* ============================================
   Free AI Coder - 樣式表
   支援深色/淺色主題
   ============================================ */

/* CSS 變數定義 */
:root {
    /* 淺色主題 (預設) */
    --bg-primary: #ffffff;
    --bg-secondary: #f7f7f8;
    --bg-tertiary: #ececf1;
    --bg-code: #f6f8fa;
    
    --text-primary: #1a1a1a;
    --text-secondary: #6b6b6b;
    --text-tertiary: #8e8e8e;
    
    --border-color: #e5e5e5;
    --border-hover: #d1d1d1;
    
    --accent-color: #10a37f;
    --accent-hover: #0d8c6d;
    --accent-light: rgba(16, 163, 127, 0.1);
    
    --user-msg-bg: #f7f7f8;
    --ai-msg-bg: #ffffff;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    
    --header-height: 60px;
    --input-height: 80px;
}

/* 深色主題 */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --bg-code: #2d333b;
    
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    
    --border-color: #404040;
    --border-hover: #505050;
    
    --accent-color: #19c59f;
    --accent-hover: #14a682;
    --accent-light: rgba(25, 197, 159, 0.15);
    
    --user-msg-bg: #2d2d2d;
    --ai-msg-bg: #1a1a1a;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

/* 基礎樣式重置 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ============================================
   應用容器
   ============================================ */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ============================================
   頂部導航欄
   ============================================ */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 20px;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.model-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 模型選擇器 */
.model-selector-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.model-selector {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    font-size: 11px;
    font-weight: 600;
    padding: 6px 28px 6px 12px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.2s ease;
    min-width: 140px;
}

.model-selector:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.model-selector:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-light);
}

.model-selector-wrapper::after {
    content: '▼';
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 8px;
    color: white;
    pointer-events: none;
}

.model-selector option {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 500;
    padding: 8px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.made-by {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ============================================
   按鈕樣式
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.theme-icon {
    font-size: 20px;
}

/* ============================================
   主要內容區域
   ============================================ */
.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* ============================================
   對話容器
   ============================================ */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    height: 100%;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background-color: var(--border-hover);
}

/* ============================================
   訊息樣式
   ============================================ */
.message {
    display: flex;
    gap: 16px;
    padding: 20px;
    margin-bottom: 4px;
    border-radius: var(--radius-lg);
    animation: fadeIn 0.3s ease;
}

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

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

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

.message-avatar {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
}

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

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.message-author {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.message-model {
    font-size: 11px;
    font-weight: 500;
    padding: 2px 8px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.message-time {
    font-size: 12px;
    color: var(--text-tertiary);
}

.message-body {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
}

.message-body p {
    margin-bottom: 12px;
}

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

.message-body ul, .message-body ol {
    margin: 12px 0;
    padding-left: 24px;
}

.message-body li {
    margin-bottom: 6px;
}

.message-body strong {
    color: var(--accent-color);
}

/* ============================================
   程式碼區塊樣式
   ============================================ */
.code-block {
    position: relative;
    margin: 16px 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: var(--bg-code);
    border: 1px solid var(--border-color);
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background-color: rgba(0, 0, 0, 0.05);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .code-header {
    background-color: rgba(255, 255, 255, 0.05);
}

.code-language {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.code-actions {
    display: flex;
    gap: 8px;
}

.code-action-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.code-action-btn.copied {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.code-block pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
}

.code-block code {
    font-family: var(--font-mono);
}

/* 行內程式碼 */
.message-body code:not(pre code) {
    font-family: var(--font-mono);
    font-size: 13px;
    padding: 2px 6px;
    background-color: var(--bg-code);
    border-radius: var(--radius-sm);
    color: var(--accent-color);
}

/* ============================================
   輸入區域
   ============================================ */
.input-container {
    padding: 16px 20px 20px;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    padding: 12px 16px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.user-input {
    flex: 1;
    min-height: 24px;
    max-height: 200px;
    padding: 0;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: transparent;
    border: none;
    resize: none;
    outline: none;
    font-family: var(--font-sans);
}

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

.send-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background-color: var(--accent-color);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
}

.send-btn svg {
    width: 18px;
    height: 18px;
    color: white;
}

.input-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
    padding: 0 4px;
}

.hint {
    font-size: 12px;
    color: var(--text-tertiary);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

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

.status-indicator.processing .status-dot {
    background-color: #f59e0b;
}

.status-indicator.error .status-dot {
    background-color: #ef4444;
    animation: none;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ============================================
   載入動畫
   ============================================ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    transition: opacity 0.3s ease;
}

.loading-overlay.hidden {
    display: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay p {
    color: white;
    font-size: 14px;
}

/* 打字指示器 */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 12px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background-color: var(--text-tertiary);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.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(-10px);
        opacity: 1;
    }
}

/* ============================================
   響應式設計
   ============================================ */
@media (max-width: 768px) {
    .header {
        padding: 0 12px;
    }
    
    .logo-text {
        font-size: 16px;
    }
    
    .model-selector-wrapper {
        display: none;
    }
    
    .chat-messages {
        padding: 12px;
    }
    
    .message {
        padding: 16px;
        gap: 12px;
    }
    
    .message-avatar {
        width: 32px;
        height: 32px;
        font-size: 20px;
    }
    
    .input-container {
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .btn span:not(:first-child) {
        display: none;
    }
    
    .message-body {
        font-size: 14px;
    }
    
    .code-block pre {
        font-size: 12px;
        padding: 12px;
    }
}

/* ============================================
   Markdown 樣式
   ============================================ */
.message-body h1,
.message-body h2,
.message-body h3,
.message-body h4 {
    margin: 20px 0 12px;
    font-weight: 600;
    line-height: 1.3;
}

.message-body h1 { font-size: 20px; }
.message-body h2 { font-size: 18px; }
.message-body h3 { font-size: 16px; }
.message-body h4 { font-size: 15px; }

.message-body blockquote {
    margin: 12px 0;
    padding: 12px 16px;
    border-left: 4px solid var(--accent-color);
    background-color: var(--accent-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

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

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

.message-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

.message-body th,
.message-body td {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.message-body th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
}

.message-body hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
}