/* 根元素变量定义 - iOS风格 */
:root {
    --primary-color: #007AFF;    /* iOS蓝色 */
    --secondary-color: #5AC8FA;  /* iOS浅蓝色 */
    --accent-color: #34C759;     /* iOS绿色 */
    --primary-gradient: linear-gradient(135deg, #007AFF, #5AC8FA); /* iOS蓝色渐变 */
    --bg-color: #F2F2F7;         /* iOS背景灰 */
    --bg-gradient: linear-gradient(135deg, #F2F2F7, #FFFFFF); /* iOS背景渐变 */
    --header-footer-bg: rgba(255, 255, 255, 0.8);  /* iOS毛玻璃效果 */
    --header-footer-border: rgba(0, 0, 0, 0.1); /* iOS边框色 */
    --user-bg: #007AFF;           /* 用户消息iOS蓝 */
    --user-gradient: linear-gradient(135deg, #007AFF, #5AC8FA); /* 用户消息渐变 */
    --bot-bg: #E5E5EA;           /* 机器人消息iOS灰 */
    --bot-gradient: linear-gradient(135deg, #E5E5EA, #F2F2F7); /* 机器人消息渐变 */
    --avatar-size: 42px;         /* 头像尺寸 */
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 25px rgba(0, 0, 0, 0.15);
    --text-primary: #000000;     /* iOS黑色文字 */
    --text-secondary: #8E8E93;   /* iOS灰色文字 */
    --ios-blur: blur(20px);      /* iOS毛玻璃模糊度 */
}

/* 添加浏览器兼容性处理 */
* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    /* 防止iOS Safari缩放 */
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

/* 移动端触摸优化 */
* {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* 弹性布局兼容性 */
.chat-container {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
}

/* 修复iOS Safari 100vh问题 */
@supports (-webkit-touch-callout: none) {
    body {
        height: -webkit-fill-available;
    }
    .chat-container {
        height: calc(-webkit-fill-available - 20px);
    }
}

/* 动画兼容性处理 */
@-webkit-keyframes fadeInUp {
    from { 
        opacity: 0;
        -webkit-transform: translateY(20px);
        transform: translateY(20px)
    }
    to { 
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0)
    }
}
@keyframes fadeInUp {
    from { 
        opacity: 0;
        -webkit-transform: translateY(20px);
        transform: translateY(20px)
    }
    to { 
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0)
    }
}

/* 消息内容样式兼容 */
.message-content {
    -webkit-animation: fadeInUp 0.4s ease-out forwards;
    animation: fadeInUp 0.4s ease-out forwards;
    -webkit-transform: translateZ(0); /* 启用硬件加速 */
    transform: translateZ(0);
}

/* 模糊效果兼容性 */
.main-header {
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

/* 输入框兼容性 */
textarea {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

/* 弹性布局兼容性增强 */
.header-nav {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
}

.messages {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.message {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: start;
    -webkit-align-items: flex-start;
    -ms-flex-align: start;
    align-items: flex-start;
}

.input-area {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
}

.loading-dots {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
}

.main-header {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
}

/* 移动端和平板优化 */
@media screen and (max-width: 768px) {
    body {
        padding: 5px;
    }
    
    .chat-container {
        height: calc(100vh - 10px);
        border-radius: 10px;
    }
    
    .main-header {
        padding: 8px 15px;
        gap: 15px;
    }
    
    .header-logo {
        height: 32px;
    }
    
    .header-nav a {
        font-size: 14px;
    }
    
    .clear-button {
        padding: 6px 10px;
        font-size: 14px;
    }
    
    .messages {
        padding: 15px;
        gap: 12px;
    }
    
    .message-content {
        font-size: 12px;
        padding: 10px 14px;
    }
    
    .input-area {
        padding: 8px;
    }
    
    textarea {
        font-size: 13px;
        padding: 6px;
    }
    
    button {
        padding: 6px 12px;
    }
}

/* 平板优化 */
@media screen and (min-width: 769px) and (max-width: 1024px) {
    .chat-container {
        max-width: 800px;
    }
    
    .main-header {
        padding: 12px 25px;
    }
    
    .messages {
        padding: 18px;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .clear-button:hover {
        background: transparent;
        transform: scale(1.0);
    }
    
    .clear-button:active {
        transform: scale(0.95) rotate(180deg);
    }
    
    button:hover {
        opacity: 1;
    }
    
    .header-nav a:hover {
        opacity: 1;
    }
    
    /* 移动端输入框优化 */
    textarea {
        -webkit-user-select: text;
        -moz-user-select: text;
        -ms-user-select: text;
        user-select: text;
    }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .avatar {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
    
    .header-logo {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* 横屏模式优化 */
@media screen and (orientation: landscape) and (max-height: 500px) {
    .chat-container {
        height: calc(100vh - 10px);
    }
    
    .main-header {
        padding: 6px 20px;
    }
    
    .messages {
        padding: 10px;
    }
    
    .input-area {
        padding: 6px;
    }
}

/* 老版本浏览器兼容 */
.chat-container {
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

.messages {
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
    -webkit-overflow-scrolling: touch;
}

textarea {
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
}

.user-message {
    -webkit-margin-start: auto;
    margin-inline-start: auto;
    -webkit-flex-direction: row-reverse;
    -ms-flex-direction: row-reverse;
    flex-direction: row-reverse;
}

.avatar {
    -webkit-flex-shrink: 0;
    -ms-flex-negative: 0;
    flex-shrink: 0;
}

.clear-button {
    -webkit-margin-start: auto;
    margin-inline-start: auto;
}

/* 移动端视口适配 */
@media screen and (max-width: 768px) {
    @-webkit-keyframes bounce {
        0%, 80%, 100% { -webkit-transform: translateY(0); }
        40% { -webkit-transform: translateY(-6px); }
    }
    @keyframes bounce {
        0%, 80%, 100% { 
            -webkit-transform: translateY(0);
            transform: translateY(0); 
        }
        40% { 
            -webkit-transform: translateY(-6px);
            transform: translateY(-6px); 
        }
    }
}

/* 修改body布局 - iOS风格 */
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif;
    background: var(--bg-gradient);
    height: 100vh;
    display: flex;
    padding: 10px;
    position: relative;
    overflow: hidden;
}

/* iOS风格的简洁背景效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 30% 70%, rgba(0, 122, 255, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(90, 200, 250, 0.02) 0%, transparent 50%);
    animation: iosBackgroundFloat 30s ease-in-out infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes iosBackgroundFloat {
    0%, 100% { 
        transform: translateY(0px);
        opacity: 1;
    }
    50% { 
        transform: translateY(-10px);
        opacity: 0.8;
    }
}

/* 调整聊天容器 - iOS风格 */
.chat-container {
    width: 100%;
    max-width: 1000px;
    height: calc(100vh - 20px);
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    position: relative;
    animation: iosSlideIn 0.6s cubic-bezier(0.25, 0.1, 0.25, 1);
    backdrop-filter: var(--ios-blur);
    border: 0.5px solid rgba(0, 0, 0, 0.04);
}

/* iOS风格入场动画 */
@keyframes iosSlideIn {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* 消息基础样式 */
.message {
    display: flex;
    align-items: flex-start;  /* 顶部对齐 */
    max-width:90%;           /* 最大宽度限制 */
    margin: 10px 0;          /* 上下外边距 */
}

.avatar {
    width: var(--avatar-size);
    height: var(--avatar-size);
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    margin: 0 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.user-message .avatar {
    margin: 0 12px 0 18px;
}

/* 消息内容样式 */
.message-content {
    padding: 12px 16px;
    border-radius: 15px;
    line-height: 1.5;
    max-width: calc(100% - var(--avatar-size) - 24px);
    font-size: 13px; /* 修改字体大小为13px */
    overflow-wrap: anywhere;
    text-align: left;  /* 默认左对齐 */
    box-shadow: 0 4px 12px rgba(0,0,0,0.15); /* 增强阴影效果 */
}

/* 用户消息阴影 */
.user-message .message-content {
    box-shadow: 2px 4px 12px rgba(0,0,0,0.15); /* 右侧阴影增强立体感 */
}

/* 机器人消息阴影 */
.bot-message .message-content {
    box-shadow: -2px 4px 12px rgba(0,0,0,0.15); /* 左侧阴影增强立体感 */
}

/* 图片消息样式 */
.message-content img,
.message-content .inline-image {
    display: block;
    margin: 8px auto;          /* 修改为上下8px，左右auto实现居中 */
    max-width: 200px;
    width: auto;       
    height: auto;      
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: transform 0.2s ease;
}

/* Dify图片容器居中 */
.message-content .dify-image-container {
    display: block !important;
    margin: 8px auto !important;
    text-align: center;
}

/* 确保所有图片在消息内容中居中 */
.message-content {
    text-align: left; /* 保持文字左对齐 */
}

.message-content img {
    margin-left: auto;
    margin-right: auto;
}

/* 图片悬停效果 */
.message-content img:hover,
.message-content .inline-image:hover {
    transform: scale(1.05);
}

/* 二维码图片特殊样式 */
.message-content img[alt*="二维码"],
.message-content img[alt*="微信"],
.message-content img[alt*="QR"] {
    max-width: 150px;
    border: 2px solid #f0f0f0;
    padding: 8px;
    background: white;
}

/* Dify知识库图片特殊样式 */
.message-content .dify-image {
    border: 1px solid #e0e0e0;
    background: #fafafa;
    padding: 4px;
    max-width: 200px;
}

.message-content .dify-image:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.2);
}

/* 图片加载状态样式 */
.message-content img[src*="/files/"] {
    position: relative;
}

.message-content img[src*="/files/"]:before {
    content: "正在加载图片...";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #999;
    font-size: 12px;
}

/* 图片加载失败提示样式 */
.message-content span[style*="color: #666"] {
    font-size: 12px;
    color: #999;
    font-style: italic;
    display: inline-block;
    margin: 8px;
    padding: 4px 8px;
    background: #f5f5f5;
    border-radius: 4px;
}

/* iOS风格消息气泡 */
.user-message .message-content {
    background: var(--user-gradient);
    color: white;
    border-bottom-right-radius: 4px;
    border: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.bot-message .message-content {
    background: var(--bot-gradient);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
    border: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* iOS风格消息入场动画 */
.message {
    animation: iosMessageSlideIn 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
    transform-origin: bottom;
}

@keyframes iosMessageSlideIn {
    0% {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 输入区域容器样式 */
/* 页眉样式 - iOS风格 */
.main-header {
    background: var(--header-footer-bg);
    box-shadow: 0 0.5px 0 rgba(0, 0, 0, 0.04);
    padding: 10px 30px;
    display: flex;
    align-items: center;
    gap: 30px;
    border-radius: 16px 16px 0 0;
    backdrop-filter: var(--ios-blur);
    border-bottom: 0.5px solid var(--header-footer-border);
    position: relative;
}

.header-logo {
    height: 40px;
}

.header-nav {
    display: flex;
    gap: 25px;
}

.header-nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.2s ease;
}

.header-nav a:hover {
    color: var(--primary-color);
}

/* 清除按钮样式 - iOS风格正方形 */
.clear-button {
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary-color);
    border: none;
    padding: 0;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-left: auto;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.clear-button:hover {
    background: rgba(0, 122, 255, 0.15);
    transform: scale(1.05);
}

.clear-button:active {
    transform: scale(0.95);
    background: rgba(0, 122, 255, 0.2);
}

.clear-button::before {
    content: "↻";
    font-size: 16px;
    transition: transform 0.3s ease;
}

.clear-button:hover::before {
    transform: rotate(180deg);
}

/* 页脚样式 - iOS风格 */
.main-footer {
    background: var(--header-footer-bg);
    border-top: 0.5px solid var(--header-footer-border);
    color: var(--text-secondary);
    text-align: center;
    padding: 5px;
    font-size: 13px;
    border-radius: 0 0 16px 16px;
    backdrop-filter: var(--ios-blur);
    position: relative;
}

/* 页脚文字样式优化 - iOS风格 */
.main-footer p {
    margin: 2px 0;
    font-weight: 400;
    line-height: 1.3;
}

.main-footer p:first-child {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 13px;
}

.main-footer p:last-child {
    color: var(--text-secondary);
    font-size: 11px;
}

/* iOS风格滚动条 */
.messages::-webkit-scrollbar {
    width: 4px;
}

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

.messages::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 2px;
}

.messages::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}

/* 消息区域 - 保持原有间距 */
.messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    scroll-behavior: smooth;
}

.input-area {
    border-top: 1px solid #eee; /* 顶部边框 */
    padding: 10px;             /* 内边距 */
    display: flex;             /* 弹性布局 */
    gap: 8px;                 /* 元素间距 */
    position: relative;        /* 相对定位 */
}

textarea {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 8px;
    resize: none;
    line-height: 1.3; 
    max-height: 60px;
    font-size: 14px;
    transition: border-color 0.2s ease;
    background: white;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea::placeholder {
    color: #999;
}

button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    font-weight: 500;
}

/* iOS按钮效果 */
button:hover:not(:disabled) {
    opacity: 0.8;
}

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

.loading-dots {
    display: none;
    gap: 4px;
    height: 20px;
    align-items: center;
    position: absolute;
    left: 50%;
    top: 50%;  /* 新增垂直定位 */
    transform: translate(-50%, -50%);  /* 修改为双向居中 */
    margin: 0;  /* 移除默认外边距 */
}

.dot {
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-6px); }
}

.btn-text {
    transition: opacity 0.2s;
}

button:disabled .btn-text {
    opacity: 0;
}

button:disabled .loading-dots {
    display: flex;
}

/* 移动端适配 */
@media (max-width: 480px) {
    .message-content img {
        max-width: 160px;
        margin: 8px 8px;       /* 同步修改移动端边距 */
    }
}

/* 光标动画 */
@keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 0; }
    100% { opacity: 1; }
}

.cursor {
    display: inline-block;
    width: 2px;
    height: 1em;
    background: var(--primary-color);
    margin-left: 2px;
    animation: blink 1s infinite;
}