:root {
    --primary-color: #3B82F6; /* 主蓝色 */
    --secondary-color: #60A5FA; /* 辅助蓝色 */
    --accent-color: #93C5FD; /* 亮蓝点缀 */
    --text-color: #1e293b;
    --bg-color: #EFF6FF; /* 淡蓝背景 */
    --card-bg: #FFFFFF;
    --hover-bg: #DBEAFE;
    --gradient-start: #3B82F6;
    --gradient-end: #60A5FA;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: url('../images/background.png') fixed center/cover, var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 统一滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
    transition: background 0.3s;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--secondary-color), var(--accent-color));
}

/* Firefox滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) #f1f5f9;
}

.main-content {
    flex: 1 0 auto;
    padding: 2rem 0;
}

/* Bootstrap导航栏样式增强 */
.navbar {
    font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) !important;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.navbar-brand {
    color: white !important;
    font-weight: bold;
    font-size: 1.3rem;
}

.navbar .nav-link {
    color: rgba(255,255,255,0.95) !important;
    padding: 0.6rem 1.2rem;
    transition: all 0.3s;
    font-weight: 500;
}

.navbar .nav-link:hover {
    color: white !important;
    background: rgba(255,255,255,0.2);
    border-radius: 8px;
    transform: translateY(-2px);
}

.navbar .nav-link.active {
    background: rgba(255,255,255,0.25);
    border-radius: 8px;
}

.navbar .nav-link i {
    font-size: 1rem;
    margin-right: 5px;
}

/* 旧的导航栏样式（已弃用，保留备份）
.navbar-old {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(26, 95, 122, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-bottom: 3px solid var(--primary-color);
    position: relative;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    transition: color 0.3s;
    white-space: nowrap;
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
    padding: 5px;
}
*/

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer {
    flex-shrink: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem 0;
    margin-top: 3rem;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.footer p {
    color: rgba(255,255,255,0.9);
    font-size: 0.9rem;
}

.hero {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.95), rgba(96, 165, 250, 0.9));
    padding: 80px 20px;
    text-align: center;
    color: white;
    border-radius: 20px;
    margin-bottom: 40px;
    box-shadow: 0 15px 50px rgba(59, 130, 246, 0.4);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    bottom: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    z-index: 1;
}

.hero::after {
    content: '';
    position: absolute;
    top: -30px;
    left: -30px;
    width: 150px;
    height: 150px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
    z-index: 1;
}

.hero > * {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 25px;
    font-weight: 800;
    text-shadow: 3px 3px 6px rgba(0,0,0,0.4);
    letter-spacing: 2px;
    color: white;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 15px;
}

.hero-buttons .btn {
    font-size: 1.1rem;
    padding: 12px 30px;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Alert样式 */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    border: 1px solid transparent;
}

.alert-success {
    background-color: #d1f2eb;
    border-color: #7dcea0;
    color: #0c5132;
}

.alert-info {
    background-color: #d6eaf8;
    border-color: #5dade2;
    color: #154360;
}

.alert-heading {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.alert hr {
    border: none;
    border-top: 1px solid rgba(0,0,0,0.1);
    margin: 0.75rem 0;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    margin: 0 0;
    transition: background 0.3s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
}

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

.btn-secondary {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: #ffffff;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 25px rgba(102, 126, 234, 0.15);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    border: 2px solid rgba(102, 126, 234, 0.1);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.3);
    border-color: rgba(102, 126, 234, 0.5);
}

.feature-card.clickable {
    cursor: pointer;
    text-decoration: none;
    color: var(--text-color);
    display: block;
}

.feature-card .feature-icon {
    font-size: 3rem;
    color: white;
    margin-bottom: 1rem;
    z-index: 2;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
}

/* 为不同功能卡片的图标设置不同颜色 */
.feature-card:nth-child(1) .feature-icon {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.feature-card:nth-child(2) .feature-icon {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.feature-card:nth-child(3) .feature-icon {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.feature-card .feature-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.05;
    z-index: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover .feature-bg {
    opacity: 0.1;
}

.feature-card h3,
.feature-card p {
    position: relative;
    z-index: 2;
}

.feature-card h3 {
    color: var(--text-color);
    font-size: 1.5rem;
    margin: 1rem 0;
    font-weight: 600;
}

.feature-card p {
    color: #666;
    line-height: 1.8;
    font-size: 0.95rem;
}

.feature-card .feature-arrow {
    position: absolute;
    bottom: 15px;
    right: 15px;
    font-size: 1.2rem;
    color: var(--accent-color);
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.feature-card:hover .feature-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* 交互页面特定样式 */
#canvas-container {
    width: 100%;
    height: 80vh;
    position: relative;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
}

#video-input {
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 160px;
    height: 120px;
    border-radius: 5px;
    transform: scaleX(-1); /* 镜像翻转 */
    opacity: 0.7;
    z-index: 10;
}

.ui-panel {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.97);
    padding: 18px;
    border-radius: 15px;
    width: 300px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
    z-index: 100;
    transition: transform 0.3s ease, opacity 0.3s ease;
    backdrop-filter: blur(10px);
}

/* 移动端独立交互控制卡片 */
.mobile-control-card {
    display: none;
}

/* 面板最小化状态 */
.ui-panel.minimized {
    transform: translateX(-270px);
    opacity: 0.95;
}

.ui-panel.minimized h3,
.ui-panel.minimized .control-group {
    display: none;
}

/* 面板切换按钮 */
.panel-toggle {
    position: absolute;
    right: 10px;
    top: 10px;
    background: rgba(59, 130, 246, 0.95);
    color: white;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    transition: all 0.3s;
    z-index: 101;
}

.panel-toggle:hover {
    background: rgba(96, 165, 250, 0.95);
    transform: scale(1.05);
}

.panel-toggle i {
    font-size: 1rem;
}

.ui-panel h3 {
    margin: 0 35px 15px 0;
    color: var(--primary-color);
    font-size: 1.05rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 8px;
}

.control-group {
    margin-bottom: 12px;
}

.control-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 0.85rem;
    color: var(--text-color);
    font-weight: 500;
}

.control-group button {
    display: block;
    text-align: center;
}

.control-group input[type="range"] {
    width: 100%;
}

.control-group input[type="file"] {
    font-size: 0.85rem;
    padding: 5px;
    width: 100%;
}

.control-group select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 0.9rem;
}

.fullscreen-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255,255,255,0.2);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    z-index: 50;
    transition: all 0.3s;
}

.fullscreen-btn:hover {
    background: rgba(255,255,255,0.3);
}

@media (max-width: 768px) {
    /* 隐藏桌面端面板，显示移动端卡片 */
    .ui-panel.desktop-panel {
        display: none !important;
    }
    
    .mobile-control-card {
        display: block !important;
    }
    
    .mobile-control-card .control-group {
        margin-bottom: 20px;
    }
    
    .mobile-control-card .control-group label {
        display: block;
        font-weight: 600;
        color: #4a5568;
        margin-bottom: 10px;
        font-size: 0.95rem;
    }
    
    .mobile-control-card .control-group input[type="range"],
    .mobile-control-card .control-group select,
    .mobile-control-card .control-group input[type="file"] {
        width: 100%;
        padding: 10px;
        font-size: 1rem;
        border-radius: 8px;
        border: 2px solid #e2e8f0;
        min-height: 44px;
    }
    
    .mobile-control-card .control-group button {
        width: 100%;
        padding: 12px;
        font-size: 1rem;
        border-radius: 8px;
        min-height: 44px;
        font-weight: 600;
    }
    
    .mobile-control-card .btn-secondary {
        background: linear-gradient(135deg, #64748b, #94a3b8);
        color: white;
        border: none;
        box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    }
    
    /* 原有移动端样式 */
    .ui-panel {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        max-height: 50vh;
        font-size: 0.9rem;
        padding: 15px;
        padding-bottom: 20px;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        border-radius: 20px 20px 0 0;
        box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
    }
    
    /* 移动端最小化状态 */
    .ui-panel.minimized {
        transform: translateY(calc(100% - 50px));
        max-height: 50px;
    }
    
    .ui-panel h3 {
        font-size: 1rem;
        margin-bottom: 12px;
    }
    
    .control-group {
        margin-bottom: 15px;
    }
    
    .control-group label {
        font-size: 0.85rem;
        margin-bottom: 8px;
    }
    
    .control-group select,
    .control-group input[type="range"] {
        font-size: 0.9rem;
        padding: 8px;
        min-height: 44px; /* 触摸目标最小尺寸 */
    }
    
    .control-group button {
        padding: 12px 16px;
        font-size: 0.9rem;
        min-height: 44px; /* 触摸目标最小尺寸 */
        min-width: 44px;
    }
    
    .panel-toggle {
        right: 15px;
        left: auto;
        transform: none;
        top: 10px;
        bottom: auto;
        width: 40px;
        height: 40px;
        min-height: 44px;
        font-size: 1.1rem;
        border-radius: 0 0 8px 8px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    }
    
    .panel-toggle i {
        transform: rotate(90deg);
    }
    
    .ui-panel.minimized .panel-toggle i {
        transform: rotate(-90deg);
    }
    
    #video-input {
        width: 120px;
        height: 90px;
        bottom: 5px;
        right: 5px;
    }
    
    .fullscreen-btn {
        top: 10px;
        right: 10px;
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    #canvas-container {
        height: 70vh;
    }
    
    .ui-panel.minimized .panel-toggle {
        bottom: -35px;
    }
    
    .ui-panel h3 {
        font-size: 1rem;
    }
    
    #video-input {
        width: 100px;
        height: 75px;
        bottom: 5px;
        right: 5px;
    }
    
    .fullscreen-btn {
        top: 10px;
        right: 10px;
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    #canvas-container {
        height: 60vh;
    }
}

footer {
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 50px;
}

/* 介绍页使用统一的 .hero 样式 */

.intro-container {
    max-width: 1200px;
    margin: 0 auto;
}

.intro-section {
    padding: 40px 20px;
}

.intro-section.alt-bg {
    background: rgba(59, 130, 246, 0.05);
    margin: 0;
    padding: 40px 20px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
}

.section-header i {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.section-header h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin: 0;
}

.intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.intro-content.full-width,
.intro-text.full-width {
    grid-column: 1 / -1;
}

.intro-text p {
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 1.05rem;
}

.intro-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.pattern-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 20px;
}

.pattern-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.pattern-card:hover {
    transform: translateY(-5px);
}

.pattern-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 15px;
}

.pattern-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.color-meanings {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
    margin-top: 30px;
}

.color-item {
    text-align: center;
    flex: 1;
    min-width: 120px;
}

.color-swatch {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
}

.color-item:hover .color-swatch {
    transform: scale(1.1);
}

.color-item h4 {
    color: var(--primary-color);
    margin-bottom: 8px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* 对话页美化 */
.chat-container {
    max-width: 700px;
    margin: 0 auto;
    padding: 20px;
}

#chat-box {
    height: 450px;
    border: 2px solid var(--accent-color);
    border-radius: 15px;
    overflow-y: scroll;
    padding: 20px;
    margin-bottom: 15px;
    background: white;
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.05);
}

.message {
    padding: 12px 16px;
    margin: 10px 0;
    border-radius: 12px;
    max-width: 80%;
    word-wrap: break-word;
}

.message.user {
    background: var(--primary-color);
    color: white;
    margin-left: auto;
    text-align: right;
}

.message.ai {
    background: #f0f0f0;
    color: var(--text-color);
}

.message.system {
    background: var(--accent-color);
    color: white;
    text-align: center;
    margin: 0 auto;
}

.chat-container input[type="text"] {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--accent-color);
    border-radius: 25px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.chat-container input[type="text"]:focus {
    border-color: var(--primary-color);
}

/* 识别页美化 */
.recognize-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.upload-area {
    border: 3px dashed var(--accent-color);
    border-radius: 15px;
    padding: 40px;
    margin: 30px 0;
    background: rgba(87, 197, 182, 0.05);
    transition: all 0.3s;
}

.upload-area:hover {
    background: rgba(87, 197, 182, 0.1);
    border-color: var(--primary-color);
}

#preview img {
    max-width: 400px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
    margin-top: 20px;
}

#result {
    margin-top: 30px;
    padding: 25px;
    background: white;
    border-radius: 15px;
    text-align: left;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    border-left: 4px solid var(--primary-color);
    line-height: 1.8;
}

/* 生成页美化 */
.generate-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

#prompt {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--accent-color);
    border-radius: 10px;
    font-size: 1rem;
    resize: vertical;
    outline: none;
    transition: border-color 0.3s;
}

#prompt:focus {
    border-color: var(--primary-color);
}

#result-area {
    margin-top: 40px;
}

#result-area img {
    max-width: 100%;
    border-radius: 15px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 旧的导航栏响应式样式（已弃用，使用Bootstrap）
    .navbar {
        padding: 0.8rem 1rem;
        flex-wrap: nowrap;
    }
    
    .logo {
        font-size: 1.2rem;
        z-index: 1001;
    }
    
    .nav-toggle {
        display: block;
        z-index: 1001;
    }
    
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        max-width: 300px;
        background: white;
        position: fixed;
        top: 0;
        right: -300px;
        height: 100vh;
        padding: 80px 20px 20px 20px;
        box-shadow: -2px 0 10px rgba(0,0,0,0.1);
        gap: 5px;
        z-index: 1000;
        transition: right 0.3s ease;
        overflow-y: auto;
    }
    
    .nav-links.active {
        display: flex;
        right: 0;
    }
    
    .nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }
    
    .nav-overlay.active {
        display: block;
    }
    
    .nav-close {
        position: absolute;
        top: 20px;
        right: 20px;
        background: none;
        border: none;
        font-size: 1.5rem;
        color: var(--primary-color);
        cursor: pointer;
        padding: 5px;
        display: block;
    }
    
    .nav-links li {
        width: 100%;
    }
    
    .nav-links a {
        display: block;
        padding: 12px 15px;
        font-size: 1rem;
        border-radius: 8px;
        text-align: left;
    }
    */
    
    .nav-links a:hover {
        background: var(--hover-bg);
    }
    
    .container {
        padding: 1rem;
    }
    
    .intro-content {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
        margin: 0;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .alert {
        font-size: 0.9rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .alert {
        font-size: 0.9rem;
    }
    
    .intro-hero h1 {
        font-size: 1.8rem;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 2rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .pattern-grid {
        grid-template-columns: 1fr;
    }
    
    .color-meanings {
        flex-direction: column;
    }
    
    .ui-panel {
        width: 90%;
        left: 5%;
    }
    
    .chat-container {
        padding: 10px;
    }
    
    #chat-box {
        height: 350px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: none;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
}

/* 全局表单和按钮样式增强 - 提升可见性 */
input[type="text"],
input[type="file"],
textarea,
select {
    border: 2px solid rgba(102, 126, 234, 0.3) !important;
    transition: all 0.3s ease !important;
    background: white !important;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    border-color: rgba(102, 126, 234, 0.8) !important;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.2) !important;
    outline: none !important;
}

button,
.btn {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
    font-weight: 500 !important;
    transition: all 0.3s ease !important;
}

button:hover,
.btn:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2) !important;
}

/* 确保所有文本颜色清晰可见 */
.card,
.feature-card,
.chat-container,
.recognize-container,
.generate-container {
    color: var(--text-color) !important;
}

.card-body,
.card-text {
    color: #4a5568 !important;
}

/* 加强链接可见性 */
a {
    transition: all 0.3s ease;
}

a:hover {
    opacity: 0.8;
}

/* 历史渊源图片悬停效果 */
.history-image {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.history-image:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2) !important;
}

/* 表单标签清晰化 */
label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.back-to-top i {
    line-height: 50px;
}