/* style-seo.css - 针对搜索引擎结构优化与阅读体验的版本 */
:root {
    --primary-color: #1a73e8;
    --primary-hover: #1557b0;
    --text-main: #202124;
    --text-secondary: #5f6368;
    --bg-color: #ffffff;
    --bg-gray: #f8f9fa;
    --border-color: #dadce0;
    --radius-md: 8px;
    --radius-lg: 16px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

body {
    font-family: var(--font-family);
    color: var(--text-main);
    background-color: var(--bg-color);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary-color); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.bg-gray { background-color: var(--bg-gray); }

/* 导航与面包屑 */
.navbar {
    border-bottom: 1px solid var(--border-color);
    background: #fff;
    padding: 16px 0;
}
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 600; }
.nav-links { display: flex; gap: 32px; font-weight: 500; }
.nav-links a { color: var(--text-secondary); }
.nav-links a:hover { color: var(--text-main); text-decoration: none; }

.breadcrumb-wrapper {
    background: #fdfdfd;
    border-bottom: 1px solid #f1f3f4;
    padding: 12px 0;
    font-size: 14px;
}
.breadcrumb ol { list-style: none; display: flex; gap: 8px; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li:not(:last-child)::after { content: '>'; color: #9aa0a6; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb span { color: var(--text-main); font-weight: 500; }

/* 主视觉区 */
.hero { padding: 80px 0; }
.hero-container { display: flex; align-items: center; justify-content: space-between; gap: 60px; }
.hero-text { flex: 1.2; }
.hero-text h1 { font-size: 48px; line-height: 1.2; margin-bottom: 24px; letter-spacing: -1px; }
.hero-text h1 strong { color: var(--primary-color); }
.hero-text p { font-size: 18px; color: var(--text-secondary); margin-bottom: 40px; }

.cta-wrapper { display: flex; flex-direction: column; gap: 16px; align-items: flex-start; }
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border-radius: 40px;
    padding: 16px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background 0.2s;
}
.btn-primary:hover { background-color: var(--primary-hover); text-decoration: none; }
.btn-text { font-size: 20px; font-weight: 600; }
.btn-subtext { font-size: 13px; opacity: 0.9; margin-top: 4px; }

.security-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #188038;
    font-size: 14px;
    font-weight: 500;
    margin-left: 12px;
}

.hero-image { flex: 0.8; display: flex; justify-content: center; }
.hero-main-logo { filter: drop-shadow(0 20px 30px rgba(0,0,0,0.1)); animation: float 6s ease-in-out infinite; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* 内容段落区 (SEO 核心) */
.content-section { padding: 80px 0; }
.section-title { font-size: 32px; font-weight: 700; margin-bottom: 48px; text-align: center; }
.section-subtitle { text-align: center; font-size: 18px; color: var(--text-secondary); margin-top: -32px; margin-bottom: 48px; }

/* 图文网格 */
.features-text-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}
.feature-article {
    background: #fff;
    padding: 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}
.feature-article h3 { font-size: 20px; margin-bottom: 16px; color: var(--primary-color); }
.feature-article p { color: var(--text-secondary); text-align: justify; }

/* 教程列表 */
.tutorial-wrapper { max-width: 800px; margin: 0 auto; }
.step-list { list-style: none; display: flex; flex-direction: column; gap: 32px; }
.step-list li { display: flex; gap: 24px; }
.step-number {
    width: 48px; height: 48px;
    background: var(--primary-color); color: #fff;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; font-weight: 700;
    flex-shrink: 0;
}
.step-content h3 { font-size: 20px; margin-bottom: 8px; }
.step-content p { color: var(--text-secondary); }

/* FAQ 折叠面板 */
.faq-accordion { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.faq-item summary {
    padding: 20px 24px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 24px;
    font-size: 24px;
    color: var(--primary-color);
}
.faq-item[open] summary::after { content: '−'; }
.faq-answer {
    padding: 0 24px 24px;
    color: var(--text-secondary);
    border-top: 1px solid #f1f3f4;
    margin-top: 8px;
    padding-top: 16px;
}

/* 页脚 */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    background: #fff;
}
.footer-bottom {
    display: flex; justify-content: space-between; align-items: center;
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-secondary); font-size: 14px; }
.copyright { color: #9aa0a6; font-size: 14px; }

@media (max-width: 768px) {
    .hero-container { flex-direction: column; text-align: center; }
    .cta-wrapper { align-items: center; }
    .features-text-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 24px; text-align: center; }
    .step-list li { flex-direction: column; align-items: center; text-align: center; gap: 16px; }
}