/* ===== Variables ===== */
:root {
    --primary: #ff6b35;
    --primary-dark: #e55a28;
    --secondary: #4a90d9;
    --dark: #1a1a2e;
    --dark-light: #16213e;
    --gray: #666;
    --gray-light: #999;
    --gray-bg: #f5f7fa;
    --white: #fff;
    --border: #e5e7eb;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

/* ===== Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background: var(--white);
    min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; }
img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-title { font-size: 2rem; text-align: center; margin-bottom: 50px; color: var(--dark); }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 40px; }
.section-more { color: var(--primary); font-weight: 500; }

/* ===== Header ===== */
.header { position: sticky; top: 0; background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); z-index: 1000; }
.nav { display: flex; justify-content: space-between; align-items: center; height: 70px; position: relative; }
.logo { display: flex; align-items: center; gap: 8px; color: var(--dark); font-weight: 700; font-size: 1.25rem; }
.logo:hover { color: var(--dark); }
.logo-badge { background: var(--primary); color: var(--white); font-size: 0.65rem; padding: 2px 6px; border-radius: 4px; font-weight: 600; }

.nav-menu { display: flex; list-style: none; gap: 32px; }
.nav-menu a { color: var(--gray); font-weight: 500; padding: 8px 0; position: relative; }
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); }
.nav-menu a.active::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--primary); }
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-menu-btn span { width: 24px; height: 2px; background: var(--dark); transition: var(--transition); }

/* ===== Hero ===== */
.hero { background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%); color: var(--white); padding: 80px 0 100px; text-align: center; }
.hero-content { max-width: 800px; margin: 0 auto; }
.hero-title { font-size: 2.5rem; margin-bottom: 24px; line-height: 1.2; }
.hero-title .fire { display: inline-block; animation: fire-pulse 1s ease-in-out infinite alternate; }
@keyframes fire-pulse { from { transform: scale(1); } to { transform: scale(1.2); } }
.hero-desc { font-size: 1.125rem; color: rgba(255,255,255,0.8); margin-bottom: 32px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 24px; }
.hero-stats { display: flex; justify-content: center; gap: 60px; margin-top: 60px; }
.stat-item { text-align: center; }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 0.875rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; font-size: 1rem; font-weight: 600; border-radius: var(--radius-sm); border: none; cursor: pointer; transition: var(--transition); }
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); color: var(--white); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(255,107,53,0.4); }
.btn-outline { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.3); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: var(--white); color: var(--white); }
.btn-lg { padding: 16px 32px; font-size: 1.125rem; }
.btn-sm { padding: 8px 14px; font-size: 0.875rem; }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #dc2626; }
.btn-block { width: 100%; }

/* ===== Steps ===== */
.steps { background: var(--gray-bg); }
.steps-grid { display: flex; align-items: center; justify-content: center; gap: 20px; flex-wrap: wrap; }
.step-card { background: var(--white); padding: 40px 30px; border-radius: var(--radius); text-align: center; width: 220px; box-shadow: var(--shadow); }
.step-number { width: 50px; height: 50px; background: var(--primary); color: var(--white); font-size: 1.5rem; font-weight: 700; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }
.step-card h3 { margin-bottom: 8px; }
.step-card p { color: var(--gray); font-size: 0.875rem; }
.step-arrow { font-size: 2rem; color: var(--primary); }
.steps-note { text-align: center; margin-top: 40px; color: var(--gray); }

/* ===== Features ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.feature-card { padding: 30px; background: var(--white); border-radius: var(--radius); border: 1px solid var(--border); transition: var(--transition); }
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--primary); }
.feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.feature-card h3 { font-size: 1.125rem; margin-bottom: 12px; }
.feature-card p { color: var(--gray); font-size: 0.9rem; }

/* ===== Why Local ===== */
.why-local { background: var(--gray-bg); }
.why-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; margin-bottom: 50px; }
.why-item { display: flex; gap: 16px; }
.why-icon { font-size: 2rem; flex-shrink: 0; }
.why-item h3 { font-size: 1.125rem; margin-bottom: 8px; }
.why-item p { color: var(--gray); font-size: 0.9rem; }
.why-diagram { display: flex; align-items: center; justify-content: center; gap: 40px; background: var(--white); padding: 40px; border-radius: var(--radius); box-shadow: var(--shadow); }
.diagram-items { display: flex; flex-wrap: wrap; gap: 12px; }
.diagram-items span { background: var(--gray-bg); padding: 8px 16px; border-radius: 20px; font-size: 0.875rem; }
.diagram-arrow { font-size: 3rem; color: var(--primary); }

/* ===== Use Cases ===== */
.use-cases-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.use-case-card { background: var(--white); padding: 24px; border-radius: var(--radius); border: 1px solid var(--border); transition: var(--transition); }
.use-case-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.use-case-icon { font-size: 1.5rem; margin-bottom: 12px; }
.use-case-card h4 { font-size: 0.95rem; margin-bottom: 8px; }
.use-case-card p { color: var(--gray); font-size: 0.8rem; line-height: 1.5; }

/* ===== Articles ===== */
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.article-card { background: var(--white); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); transition: var(--transition); }
.article-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.article-cover { height: 180px; overflow: hidden; }
.article-cover img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.article-card:hover .article-cover img { transform: scale(1.05); }
.article-content { padding: 20px; }
.article-category { display: inline-block; background: var(--primary); color: var(--white); font-size: 0.7rem; padding: 4px 10px; border-radius: 20px; margin-bottom: 12px; }
.article-title { font-size: 1.1rem; margin-bottom: 12px; line-height: 1.4; }
.article-title a { color: var(--dark); }
.article-title a:hover { color: var(--primary); }
.article-summary { color: var(--gray); font-size: 0.875rem; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.article-meta { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--gray-light); }
.latest-articles { background: var(--gray-bg); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--white); border-radius: var(--radius); margin-bottom: 16px; overflow: hidden; border: 1px solid var(--border); }
.faq-question { padding: 20px 24px; font-size: 1rem; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-question::after { content: '+'; font-size: 1.5rem; color: var(--primary); transition: var(--transition); }
.faq-item.active .faq-question::after { transform: rotate(45deg); }
.faq-answer { display: none; padding: 0 24px 20px; color: var(--gray); }
.faq-item.active .faq-answer { display: block; }
.faq-answer p { margin-bottom: 12px; }

/* ===== Page Header ===== */
.page-header { background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%); color: var(--white); padding: 60px 0; text-align: center; }
.page-title { font-size: 2rem; margin-bottom: 12px; }
.page-desc { color: rgba(255,255,255,0.7); }

/* ===== Article Page ===== */
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 40px; }
.article-header { margin-bottom: 30px; }
.article-breadcrumb { font-size: 0.875rem; color: var(--gray-light); margin-bottom: 16px; }
.article-breadcrumb a { color: var(--gray); }
.article-category-badge { display: inline-block; background: var(--primary); color: var(--white); font-size: 0.75rem; padding: 4px 12px; border-radius: 20px; margin-bottom: 12px; }
.article-title { font-size: 2rem; margin-bottom: 16px; line-height: 1.3; }
.article-meta-full { display: flex; flex-wrap: wrap; gap: 20px; font-size: 0.875rem; color: var(--gray-light); }
.article-cover-full { margin-bottom: 30px; border-radius: var(--radius); overflow: hidden; }
.article-summary-full { background: var(--gray-bg); padding: 20px; border-radius: var(--radius-sm); margin-bottom: 30px; color: var(--gray); border-left: 4px solid var(--primary); }
.article-body { font-size: 1.0625rem; line-height: 1.8; color: #333; }
.article-body h2, .article-body h3 { margin-top: 32px; margin-bottom: 16px; }
.article-body h2 { font-size: 1.5rem; }
.article-body h3 { font-size: 1.25rem; }
.article-body p { margin-bottom: 16px; }
.article-body ul, .article-body ol { margin-bottom: 16px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; }
.article-share { margin-top: 20px; display: flex; align-items: center; gap: 12px; }
.share-btn { background: var(--gray-bg); border: none; padding: 8px 16px; border-radius: var(--radius-sm); cursor: pointer; transition: var(--transition); }
.share-btn:hover { background: var(--primary); color: var(--white); }

.article-sidebar .sticky { position: sticky; top: 90px; }
.sidebar-widget { background: var(--white); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); margin-bottom: 24px; }
.widget-title { font-size: 1rem; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--primary); }
.related-list { list-style: none; }
.related-item { margin-bottom: 12px; }
.related-item a { display: block; padding: 12px; background: var(--gray-bg); border-radius: var(--radius-sm); transition: var(--transition); }
.related-item a:hover { background: var(--primary); color: var(--white); }
.related-item h4 { font-size: 0.9rem; margin-bottom: 4px; }
.related-date { font-size: 0.75rem; opacity: 0.7; }
.no-related { color: var(--gray-light); font-size: 0.875rem; }

/* ===== Articles Page ===== */
.articles-layout { display: grid; grid-template-columns: 280px 1fr; gap: 40px; }
.articles-sidebar { flex-shrink: 0; }
.category-list { list-style: none; }
.category-list li { margin-bottom: 8px; }
.category-list a { display: flex; justify-content: space-between; align-items: center; padding: 10px 12px; border-radius: var(--radius-sm); color: var(--gray); transition: var(--transition); }
.category-list a:hover, .category-list a.active { background: var(--gray-bg); color: var(--primary); }
.category-list .count { background: var(--gray-bg); padding: 2px 8px; border-radius: 10px; font-size: 0.75rem; }
.empty-state { text-align: center; padding: 60px; color: var(--gray-light); }

/* ===== Pagination ===== */
.pagination { display: flex; justify-content: center; align-items: center; gap: 8px; margin-top: 40px; }
.page-link { padding: 8px 16px; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--gray); transition: var(--transition); }
.page-link:hover, .page-link.active { background: var(--primary); border-color: var(--primary); color: var(--white); }
.page-ellipsis { color: var(--gray-light); }

/* ===== Footer ===== */
.footer { background: var(--dark); color: rgba(255,255,255,0.7); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 8px; color: var(--white); font-weight: 700; font-size: 1.25rem; }
.footer-desc { font-size: 0.875rem; line-height: 1.6; }
.footer-col h4 { color: var(--white); margin-bottom: 20px; font-size: 1rem; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 12px; }
.footer-col a { color: rgba(255,255,255,0.6); font-size: 0.875rem; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 0.875rem; }

/* PC端移动端相关文章隐藏 */
.related-articles-mobile { display: none; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .features-grid, .use-cases-grid, .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { display: none !important; }
    .related-articles-mobile { display: block !important; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu { display: none; position: absolute; top: 100%; right: 0; background: white; padding: 16px 20px; box-shadow: 0 4px 16px rgba(0,0,0,0.15); border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; flex-direction: column; gap: 12px; min-width: 180px; z-index: 999; }
    .nav-menu.show { display: flex; }
    .mobile-menu-btn { display: flex; }
    .hero-title { font-size: 1.75rem; }
    .hero-stats { flex-direction: column; gap: 20px; }
    .steps-grid { flex-direction: column; }
    .features-grid, .use-cases-grid, .articles-grid { grid-template-columns: 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .articles-layout { grid-template-columns: 1fr; }
    .section { padding: 60px 0; }
    .section-title { font-size: 1.5rem; }
    .footer-grid { grid-template-columns: 1fr; text-align: center; }
    
    .article-sidebar { display: none !important; visibility: hidden !important; opacity: 0 !important; }
    .related-articles-mobile { display: block !important; margin-top: 32px; padding-top: 24px; border-top: 1px solid #e5e7eb; }
    .related-articles-mobile h3.widget-title { font-size: 18px; margin-bottom: 16px; color: #1a1a2e; }
    .related-articles-mobile .related-item { margin-bottom: 12px; padding: 12px; background: #f9f9f9; border-radius: 8px; }
}

/* ===== Animations ===== */
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.article-card, .feature-card, .use-case-card { animation: fadeIn 0.5s ease forwards; }


/* ===== Hero QR Code Button ===== */
.hero-qrcode-btn { margin-top: 20px; }
.btn-wechat { background: rgba(255,255,255,0.15); color: #fff; border: 1.5px solid rgba(255,255,255,0.4); padding: 10px 28px; border-radius: 50px; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.25s; backdrop-filter: blur(4px); }
.btn-wechat:hover { background: rgba(255,255,255,0.25); border-color: rgba(255,255,255,0.6); transform: translateY(-1px); }