/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', sans-serif;
}

:root {
    --primary-color: #0066cc;
    --secondary-color: #00a0dc;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --transition: all 0.3s ease;
}

body {
    background-color: var(--light-bg);
    color: var(--text-color);
    line-height: 1.6;
}

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

/* Header Styles */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.header-content {
    position: relative;
    z-index: 1;
    color: white;
    text-align: left;
    padding: 50px 0;
}

.header-content h1 {
    font-weight: 700;
    margin-bottom: 20px;
    animation: slideInLeft 1s ease-out;
}

.header-content p {
    max-width: 800px;
    margin-bottom: 30px;
    opacity: 0.9;
    animation: slideInLeft 1s ease-out 0.3s;
    animation-fill-mode: both;
}

/* Section Styles */
section {
    padding: 80px 0;
    background: white;
}

section:nth-child(even) {
    background: var(--light-bg);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5em;
    color: var(--primary-color);
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--secondary-color);
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.feature-card h3 {
    font-size: 1.5em;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature-card p {
    font-size: 1em;
    margin-bottom: 0;
}

.feature-icon {
    font-size: 2.5em;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

/* Animations */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content h1 {
        font-size: 2.5em;
    }
    
    .header-content p {
        font-size: 1.2em;
    }

    section {
        padding: 60px 0;
    }

    .section-header h2 {
        font-size: 2em;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* Footer Styles */
.footer {
    background: #333;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    font-size: 0.9em;
}

.footer p {
    margin-bottom: 10px;
    opacity: 0.8;
}

.footer a {
    color: #fff;
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.beian-info {
    margin-top: 10px;
    opacity: 0.8;
}

/* Back Button */
.back-button {
    display: inline-block;
    margin-top: 30px;
    padding: 12px 25px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: var(--transition);
}

.back-button:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
}

/* Content Styles */
.content-section {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

.content-section p {
    font-size: 1.1em;
    margin-bottom: 25px;
    text-align: justify;
}