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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.8;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid #e8e8e8;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    color: #666;
    text-decoration: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-back:hover {
    background: #f5f5f5;
    color: #667eea;
}

.nav-back svg {
    transition: transform 0.2s;
}

.nav-back:hover svg {
    transform: translateX(-2px);
}

.nav-logo {
    font-size: 18px;
    font-weight: 700;
    color: #333;
    text-decoration: none;
}

.nav-logo:hover {
    color: #667eea;
}

/* 主内容 */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px 40px;
}

.content-wrapper {
    background: white;
    border-radius: 16px;
    padding: 48px 60px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.page-title {
    font-size: 32px;
    font-weight: 700;
    color: #000;
    margin-bottom: 32px;
    text-align: center;
    padding-bottom: 24px;
    border-bottom: 2px solid #667eea;
}

.section {
    margin-bottom: 48px;
}

.section-title {
    font-size: 24px;
    font-weight: 600;
    color: #000;
    margin-bottom: 24px;
    padding-left: 16px;
    border-left: 4px solid #667eea;
}

.intro {
    font-size: 16px;
    line-height: 2;
    color: #555;
    text-indent: 2em;
    margin-bottom: 24px;
}

/* 条款样式 */
.clause {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 12px;
    transition: all 0.2s;
}

.clause:hover {
    background: #f0f0ff;
    transform: translateX(4px);
}

.clause-number {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
}

.clause-content {
    flex: 1;
    font-size: 15px;
    line-height: 1.8;
    color: #444;
    padding-top: 6px;
}

/* 高亮文本 */
.highlight-text {
    font-size: 16px;
    line-height: 2;
    color: #667eea;
    background: #f0f2ff;
    padding: 20px 24px;
    border-radius: 12px;
    border-left: 4px solid #667eea;
    margin-bottom: 24px;
    font-weight: 500;
}

/* 信息框 */
.info-box {
    background: #fff9e6;
    border: 2px solid #ffd700;
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
}

.info-box h3 {
    font-size: 18px;
    font-weight: 600;
    color: #d97706;
    margin-bottom: 12px;
}

.info-box p {
    font-size: 15px;
    line-height: 1.8;
    color: #666;
}

/* 子标题 */
.subsection-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin: 24px 0 12px;
}

/* 联系框 */
.contact-box {
    background: linear-gradient(135deg, #f0f2ff 0%, #fff 100%);
    border: 2px solid #667eea;
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
}

.contact-box h3 {
    font-size: 18px;
    font-weight: 600;
    color: #667eea;
    margin-bottom: 12px;
}

.email-placeholder {
    font-size: 16px;
    color: #999;
    font-style: italic;
    margin-bottom: 12px;
}

.note {
    font-size: 14px;
    color: #666;
    margin-top: 12px;
}

/* 要求列表 */
.requirements {
    background: #f9f9f9;
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
}

.requirements h3 {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 16px;
}

.requirements ul {
    list-style: none;
    padding: 0;
}

.requirements li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 12px;
    font-size: 15px;
    line-height: 1.8;
    color: #555;
}

.requirements li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #52c41a;
    font-weight: 700;
    font-size: 18px;
}

/* 返回按钮 */
.back-button-wrapper {
    text-align: center;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid #e8e8e8;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 24px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.btn-back:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 40px 20px 20px;
    color: #999;
    font-size: 14px;
}

.footer p {
    margin-bottom: 8px;
}

/* 响应式 */
@media (max-width: 768px) {
    .content-wrapper {
        padding: 32px 24px;
    }

    .page-title {
        font-size: 24px;
    }

    .section-title {
        font-size: 20px;
    }

    .clause {
        flex-direction: column;
        gap: 12px;
    }

    .clause-number {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
}