/* ==================== 全局样式 ==================== */
:root {
    --sidebar-width: 280px;
    --header-height: 64px;
    --primary-color: #4f6ef7;
    --primary-hover: #3b5de7;
    --bot-bg: #f0f4ff;
    --user-bg: #4f6ef7;
    --sidebar-bg: #1e2a4a;
    --border-color: #e8ecf1;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
                 "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: #f5f7fb;
    height: 100vh;
    overflow: hidden;
}

/* ==================== 整体布局 ==================== */
.app-container {
    display: flex;
    height: 100vh;
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 100;
}

.sidebar-header {
    padding: 20px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.app-logo {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
}

.sidebar-section {
    padding: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar-label {
    color: rgba(255, 255, 255, 0.45);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.quick-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 9px 12px;
    margin-bottom: 4px;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: left;
}

.quick-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.quick-btn i {
    font-size: 15px;
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px;
    margin-top: auto;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    color: rgba(255, 255, 255, 0.55);
    font-size: 12px;
    padding: 3px 0;
}

/* ==================== 主聊天区域 ==================== */
.main-chat {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: #fff;
}

.chat-header {
    height: var(--header-height);
    min-height: var(--header-height);
    padding: 0 24px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background: #fff;
}

/* ==================== 消息区域 ==================== */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 24px;
    background: #fafbfc;
    scroll-behavior: smooth;
}

/* 消息气泡通用 */
.message-bot,
.message-user {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    animation: fadeInUp 0.3s ease;
}

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

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

/* 头像 */
.message-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.message-bot .message-avatar {
    background: #e8edff;
    color: var(--primary-color);
}

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

/* 消息气泡 */
.message-bubble {
    max-width: 75%;
    padding: 12px 16px;
    border-radius: 14px;
    line-height: 1.65;
    font-size: 14px;
    word-break: break-word;
}

.bot-bubble {
    background: var(--bot-bg);
    color: #2c3e50;
    border-top-left-radius: 4px;
}

.user-bubble {
    background: var(--user-bg);
    color: #fff;
    border-top-right-radius: 4px;
}

/* Markdown 内容样式 */
.message-text h1, .message-text h2, .message-text h3 {
    font-size: 1.05em;
    margin: 4px 0;
    font-weight: 600;
}

.message-text p {
    margin-bottom: 6px;
}

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

.message-text ul, .message-text ol {
    padding-left: 20px;
    margin: 6px 0;
}

.message-text code {
    background: rgba(0, 0, 0, 0.07);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

.message-text pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 12px;
    margin: 8px 0;
}

.message-text pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.message-text blockquote {
    border-left: 3px solid var(--primary-color);
    padding-left: 12px;
    color: #666;
    margin: 8px 0;
}

.message-text strong {
    color: #1a1a2e;
}

.message-text table {
    width: 100%;
    border-collapse: collapse;
    margin: 8px 0;
    font-size: 13px;
}

.message-text th, .message-text td {
    border: 1px solid #ddd;
    padding: 6px 10px;
    text-align: left;
}

.message-text th {
    background: #f5f7fb;
    font-weight: 600;
}

/* 打字动画指示器 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: #a0b4f0;
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.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(-6px); opacity: 1; }
}

/* ==================== 输入区域 ==================== */
.chat-input-area {
    padding: 16px 24px 20px;
    border-top: 1px solid var(--border-color);
    background: #fff;
}

.input-group-wrapper .input-group {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    overflow: hidden;
}

.input-group-wrapper .form-control {
    padding: 12px 16px;
    border: 1px solid #e0e5ec;
    border-right: none;
    font-size: 14px;
    box-shadow: none;
}

.input-group-wrapper .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: none;
}

.input-group-wrapper .btn {
    padding: 10px 20px;
    background: var(--primary-color);
    border: 1px solid var(--primary-color);
    font-size: 16px;
}

.input-group-wrapper .btn:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
}

.input-hint {
    font-size: 11px;
    color: #999;
    margin-top: 8px;
    text-align: center;
}

/* ==================== 响应式 ==================== */
@media (max-width: 992px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
    }

    .sidebar.show {
        transform: translateX(0);
    }

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

    .chat-messages {
        padding: 16px 12px;
    }

    .chat-input-area {
        padding: 12px;
    }
}

@media (max-width: 576px) {
    .message-bubble {
        max-width: 90%;
    }

    .chat-header h5 {
        font-size: 16px;
    }
}

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

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

.chat-messages::-webkit-scrollbar-thumb {
    background: #d0d5dd;
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #a0a7b0;
}