/* 基础样式重置 */
* {
    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-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #1a252f 0%, #2d3748 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.3rem;
    opacity: 0.8;
    letter-spacing: 1px;
}

/* 导航栏样式 */
nav {
    background-color: #ffffff;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
}

nav ul {
    display: flex;
    list-style: none;
    justify-content: center;
    gap: 2rem;
}

nav ul li a {
    color: #2d3748;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: #1abc9c;
    transition: width 0.3s ease;
}

nav ul li a:hover::after {
    width: 100%;
}

nav ul li a:hover {
    color: #1abc9c;
}

/* 主要内容区域 */
main {
    min-height: calc(100vh - 200px);
}

section {
    padding: 6rem 0;
}

.hero {
    background: linear-gradient(135deg, #1abc9c 0%, #16a085 100%);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(255,255,255,0.1) 0%, transparent 70%);
    top: -50%;
    left: -50%;
    border-radius: 50%;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: 1.3rem;
    max-width: 800px;
    margin: 0 auto 3rem;
    position: relative;
    z-index: 1;
}

.cta-button {
    display: inline-block;
    background-color: #e74c3c;
    color: white;
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(231, 76, 60, 0.3);
}

.cta-button:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(231, 76, 60, 0.4);
}

.zebusheet {
    background-color: #ffffff;
}

.zebusheet h2, .about h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: #2d3748;
    font-size: 2.5rem;
    font-weight: 700;
}

.feature {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    position: relative;
    z-index: 1;
}

.feature h3 {
    color: #1abc9c;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    font-weight: 600;
}

.feature ul {
    margin: 1.5rem 0;
    padding-left: 1.5rem;
}

.feature li {
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 1.5rem;
}

.feature li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #1abc9c;
    font-weight: bold;
}

.about {
    background-color: #f8f9fa;
}

.about p {
    max-width: 800px;
    margin: 0 auto 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* 功能卡片网格 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin-top: 2.5rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 5px;
    top: 0;
    left: 0;
    background: linear-gradient(90deg, #1abc9c, #16a085);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card h3 {
    color: #2d3748;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
}

.use-case {
    max-width: 900px;
    margin: 2.5rem auto;
    padding: 2rem;
    background: #ffffff;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.use-case h3 {
    color: #1abc9c;
    margin-bottom: 0.75rem;
    font-size: 1.4rem;
    font-weight: 600;
}

/* 页脚样式 */
footer {
    background-color: #1a252f;
    color: white;
    text-align: center;
    padding: 3rem 0;
    font-size: 0.95rem;
}

footer p {
    opacity: 0.7;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .container {
        max-width: 800px;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav ul li {
        margin: 0.5rem 0;
    }
    
    section {
        padding: 4rem 0;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .feature {
        padding: 2rem;
    }
    
    .feature h3 {
        font-size: 1.5rem;
    }
    
    .feature li::before {
        left: -1.5rem;
    }
    
    .cta-button {
        padding: 12px 28px;
        font-size: 1rem;
    }
}