/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* 导航栏样式 */
.navbar {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
}

.nav-link {
    transition: all 0.3s ease;
    border-radius: 5px;
    margin: 0 5px;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

/* 英雄区域 */
.hero-section {
    padding: 100px 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,133.3C960,128,1056,96,1152,90.7C1248,85,1344,107,1392,117.3L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
    opacity: 0.3;
}

.feature-card {
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    padding: 30px 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s ease;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    background: rgba(255,255,255,0.15);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.feature-card i {
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.feature-card:hover i {
    transform: scale(1.2) rotate(10deg);
}

/* 可视化卡片 */
.visualization-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    transition: transform 0.3s ease;
}

.visualization-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(0,0,0,0.15);
}

.visualization-container {
    background: #f8f9fa;
    border: 2px dashed #dee2e6;
    border-radius: 15px;
    height: 500px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.3s ease;
}

.visualization-container:hover {
    border-color: #007bff;
    border-style: solid;
}

/* 按钮样式 */
.btn {
    border-radius: 25px;
    padding: 10px 25px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.btn-warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.btn-danger {
    background: linear-gradient(135deg, #fc4a1a 0%, #f7b733 100%);
}

.btn-info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.btn-secondary {
    background: linear-gradient(135deg, #868f96 0%, #596164 100%);
}

/* 数据信息区域 */
.data-info {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    border-left: 5px solid #007bff;
}

.data-info h5 {
    color: #007bff;
    font-weight: bold;
    margin-bottom: 15px;
}

.data-info ul {
    margin-bottom: 0;
    padding-left: 20px;
}

.data-info li {
    margin-bottom: 8px;
    position: relative;
    list-style-type: none;
    padding-left: 25px;
}

.data-info li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

/* 技术栈样式 */
.tech-stack {
    margin-top: 40px;
}

.tech-item {
    background: white;
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.tech-item i {
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.tech-item:hover i {
    transform: scale(1.3) rotate(5deg);
}

/* 背景颜色 */
.bg-light {
    background-color: #f8f9fa !important;
}

/* 页脚 */
footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-section {
        padding: 60px 0;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .visualization-container {
        height: 350px;
    }
    
    .feature-card {
        margin-bottom: 20px;
    }
}

/* 加载动画 */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.loading::after {
    content: '';
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 节标题样式 */
section {
    position: relative;
}

section h2 {
    position: relative;
    display: inline-block;
    margin-bottom: 30px;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

/* 卡片阴影效果 */
.shadow-custom {
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

/* 文本渐变 */
.text-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}