* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #202124;
    background-color: #ffffff;
    overflow-x: hidden;
}

/* 顶部导航 */
header {
    position: sticky;
    top: 0;
    background: #ffffff;
    border-bottom: 1px solid #dadce0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    height: 70px;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #202124;
    font-size: 24px;
    font-weight: 600;
    transition: opacity 0.3s;
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #4285F4 0%, #34A853 50%, #EA4335 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 20px;
}

.nav-links {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: #5f6368;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #34A853;
}

/* 页面标题 */
.page-header {
    background: linear-gradient(135deg, #34A853 0%, #1b8e47 100%);
    color: white;
    padding: 60px 40px;
    text-align: center;
}

.page-header h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.95;
    font-weight: 300;
}

/* 主容器 */
.main-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 60px 40px;
}

.section {
    margin-bottom: 80px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 30px;
    color: #202124;
    padding-bottom: 15px;
    border-bottom: 3px solid #34A853;
}

.section-subtitle {
    font-size: 16px;
    color: #5f6368;
    margin-bottom: 20px;
    font-weight: 300;
}

/* 准备清单 */
.checklist {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 30px;
    border-left: 4px solid #34A853;
}

.checklist-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
    font-size: 16px;
    color: #202124;
}

.checklist-item:last-child {
    margin-bottom: 0;
}

.checklist-check {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    background: #34A853;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-top: 2px;
}

.checklist-content h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 5px;
    color: #202124;
}

.checklist-content p {
    font-size: 15px;
    color: #5f6368;
    margin: 0;
}

/* 警告框 */
.warning-box {
    background: #fff3e0;
    border-left: 4px solid #f57c00;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    font-size: 15px;
    color: #e65100;
}

.warning-box strong {
    display: block;
    margin-bottom: 8px;
    font-size: 16px;
}

/* 提示框 */
.tip-box {
    background: #e8f5e9;
    border-left: 4px solid #34A853;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    font-size: 15px;
    color: #1b8e47;
}

.tip-box strong {
    display: block;
    margin-bottom: 8px;
    font-size: 16px;
}

/* 步骤 */
.steps-container {
    display: grid;
    gap: 25px;
}

.step {
    background: #ffffff;
    border: 2px solid #dadce0;
    border-radius: 12px;
    padding: 30px;
    transition: all 0.3s;
}

.step:hover {
    border-color: #34A853;
    box-shadow: 0 4px 12px rgba(52, 168, 83, 0.1);
}

.step-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 15px;
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: #34A853;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
}

.step-title {
    font-size: 22px;
    font-weight: 600;
    color: #202124;
}

.step-content {
    margin-left: 70px;
}

.step-content p {
    font-size: 15px;
    color: #5f6368;
    margin-bottom: 12px;
    line-height: 1.8;
}

.step-content ul {
    margin-left: 20px;
    font-size: 15px;
    color: #5f6368;
}

.step-content li {
    margin-bottom: 8px;
    line-height: 1.6;
}

/* FAQ */
.faq-item {
    background: #ffffff;
    border: 1px solid #dadce0;
    border-radius: 8px;
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    font-weight: 600;
    background: #f8f9fa;
    transition: all 0.3s;
}

.faq-question:hover {
    background: #eee;
    color: #34A853;
}

.faq-toggle {
    font-size: 18px;
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 15px;
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.faq-item.active .faq-answer {
    max-height: 600px;
    transition: max-height 0.3s ease-in;
}

.faq-answer-content {
    padding: 20px;
    color: #5f6368;
    font-size: 15px;
    line-height: 1.8;
    background: #ffffff;
}

.faq-answer-content ul {
    margin-left: 20px;
    margin-top: 10px;
}

.faq-answer-content li {
    margin-bottom: 8px;
}

/* 快速链接 */
.quick-links {
    background: #f0f8ff;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    border: 2px dashed #4285F4;
    margin: 40px 0;
}

.quick-links h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #202124;
}

.quick-links p {
    font-size: 15px;
    color: #5f6368;
    margin-bottom: 20px;
    line-height: 1.8;
}

.quick-link-btn {
    display: inline-block;
    padding: 12px 24px;
    background: #34A853;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.3s;
    margin: 0 10px;
}

.quick-link-btn:hover {
    background: #1b8e47;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 168, 83, 0.3);
}

/* 页脚 */
footer {
    background: #202124;
    color: #e8eaed;
    padding: 40px;
    text-align: center;
    font-size: 14px;
    margin-top: 60px;
}

.footer-links {
    margin-bottom: 20px;
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-links a {
    color: #e8eaed;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #34A853;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar {
        padding: 0 20px;
        height: 60px;
    }
    
    .nav-links {
        gap: 20px;
        font-size: 14px;
    }
    
    .page-header {
        padding: 40px 20px;
    }
    
    .page-header h1 {
        font-size: 32px;
    }
    
    .page-header p {
        font-size: 16px;
    }
    
    .main-container {
        padding: 40px 20px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .step {
        padding: 20px;
    }
    
    .step-header {
        gap: 15px;
    }
    
    .step-number {
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
    
    .step-title {
        font-size: 18px;
    }
    
    .step-content {
        margin-left: 0;
    }
    
    .quick-link-btn {
        display: block;
        width: 100%;
        margin: 10px 0;
    }
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #34A853;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: all 0.3s;
    z-index: 999;
    text-decoration: none;
    font-size: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.back-to-top.show {
    opacity: 1;
}

.back-to-top:hover {
    background: #1b8e47;
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}