* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; color: #212121; background: #FFF8F8; line-height: 1.7; }
.container { width: 92%; max-width: 1180px; margin: 0 auto; padding: 0 16px; }
img { max-width: 100%; height: auto; display: block; }

.site-header { background: #fff; border-bottom: 1px solid rgba(0,0,0,0.08); position: sticky; top: 0; z-index: 100; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.25rem; color: #D32F2F; text-decoration: none; }
.logo svg { width: 28px; height: 28px; flex-shrink: 0; }
.main-nav { display: flex; gap: 28px; }
.main-nav a { color: #212121; text-decoration: none; font-size: 0.95rem; padding: 6px 0; border-bottom: 2px solid transparent; transition: color 0.2s, border-color 0.2s; }
.main-nav a:hover, .main-nav a.active { color: #D32F2F; border-bottom-color: #D32F2F; }

.hero { background: linear-gradient(135deg, #FFF8F8 0%, #FFCDD2 100%); padding: 64px 0 56px; }
.hero .container { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; }
.hero h1 { font-size: 2.6rem; line-height: 1.25; margin-bottom: 18px; color: #B71C1C; }
.hero .lead { font-size: 1.15rem; color: #666; margin-bottom: 28px; }
.hero-badges { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.hero-badges span { display: inline-flex; align-items: center; gap: 6px; background: #fff; border: 1px solid rgba(0,0,0,0.08); padding: 6px 12px; border-radius: 20px; font-size: 0.85rem; color: #666; }
.hero-visual { display: flex; align-items: center; justify-content: center; }
.hero-visual svg { width: 220px; height: 220px; }

.section { padding: 56px 0; }
.section.alt { background: #fff; }
.section h2 { font-size: 1.9rem; margin-bottom: 14px; color: #B71C1C; }
.section .subhead { color: #666; font-size: 1.05rem; margin-bottom: 36px; max-width: 760px; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 960px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .hero .container { grid-template-columns: 1fr; } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } .grid-4 { grid-template-columns: 1fr; } }

.card { background: #fff; border: 1px solid rgba(0,0,0,0.08); border-radius: 12px; padding: 24px; box-shadow: 0 2px 10px rgba(0,0,0,0.03); transition: transform 0.2s, box-shadow 0.2s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.card-icon { width: 48px; height: 48px; border-radius: 10px; background: #FFCDD2; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; color: #D32F2F; }
.card-icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 1.15rem; margin-bottom: 10px; color: #B71C1C; }
.card p { color: #666; font-size: 0.95rem; }

.download-panel { background: #fff; border: 1px solid rgba(0,0,0,0.08); border-radius: 14px; padding: 32px; text-align: center; }
.download-panel h3 { font-size: 1.4rem; margin-bottom: 12px; color: #B71C1C; }
.download-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 20px; }
.download-btn { display: inline-flex; align-items: center; gap: 8px; background: #D32F2F; color: #fff; border: none; border-radius: 8px; padding: 12px 22px; font-size: 1rem; font-weight: 500; cursor: pointer; transition: background 0.2s, transform 0.15s; text-decoration: none; }
.download-btn:hover { background: #B71C1C; transform: translateY(-2px); }
.download-btn svg { width: 18px; height: 18px; }

.platform-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 28px; }
@media (max-width: 960px) { .platform-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .platform-grid { grid-template-columns: 1fr; } }
.platform-card { background: #fff; border: 1px solid rgba(0,0,0,0.08); border-radius: 12px; padding: 22px; text-align: center; }
.platform-card svg { width: 44px; height: 44px; margin-bottom: 12px; color: #D32F2F; }
.platform-card h4 { margin-bottom: 8px; color: #B71C1C; }
.platform-card p { font-size: 0.9rem; color: #666; margin-bottom: 14px; }
.platform-card .meta { font-size: 0.8rem; color: #666; opacity: 0.8; }

.steps { counter-reset: step; }
.step { display: flex; gap: 18px; margin-bottom: 24px; }
.step::before { counter-increment: step; content: counter(step); display: flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: 50%; background: #D32F2F; color: #fff; font-weight: 700; flex-shrink: 0; }
.step h4 { color: #B71C1C; margin-bottom: 6px; }
.step p { color: #666; font-size: 0.95rem; }

.review { background: #fff; border-left: 4px solid #D32F2F; padding: 18px 22px; border-radius: 0 10px 10px 0; margin-bottom: 18px; }
.review p { font-style: italic; color: #212121; margin-bottom: 10px; }
.review .author { color: #666; font-size: 0.9rem; font-weight: 500; }

.stats { display: flex; gap: 32px; justify-content: space-around; flex-wrap: wrap; text-align: center; }
.stat strong { display: block; font-size: 2rem; color: #D32F2F; }
.stat span { color: #666; font-size: 0.9rem; }

.compare-table { width: 100%; border-collapse: collapse; margin-top: 20px; background: #fff; border: 1px solid rgba(0,0,0,0.08); border-radius: 12px; overflow: hidden; }
.compare-table th, .compare-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid rgba(0,0,0,0.06); }
.compare-table th { background: #FFCDD2; color: #B71C1C; font-weight: 600; }
.compare-table tr:last-child td { border-bottom: none; }

.faq-list { max-width: 860px; }
.faq-item { border-bottom: 1px solid rgba(0,0,0,0.08); padding: 22px 0; }
.faq-item h3 { font-size: 1.1rem; color: #B71C1C; margin-bottom: 10px; }
.faq-item p { color: #666; }

.article-body { max-width: 820px; }
.article-body h2 { font-size: 1.6rem; color: #B71C1C; margin: 36px 0 16px; }
.article-body h3 { font-size: 1.25rem; color: #D32F2F; margin: 26px 0 12px; }
.article-body p { margin-bottom: 14px; color: #212121; }
.article-body ul { margin: 14px 0 14px 24px; color: #212121; }
.article-body li { margin-bottom: 8px; }
.cta-box { background: linear-gradient(135deg, #FFCDD2 0%, #FFF8F8 100%); border-radius: 14px; padding: 28px; margin-top: 36px; text-align: center; }
.cta-box h3 { color: #B71C1C; margin-bottom: 12px; }
.cta-box p { color: #666; margin-bottom: 18px; }

.site-footer { background: #1a1a1a; color: #bbb; padding: 36px 0; margin-top: 40px; }
.site-footer p { margin-bottom: 8px; font-size: 0.9rem; }

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }