*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:#1a1a1a;background:#fff;line-height:1.75;-webkit-font-smoothing:antialiased;font-size:16px}
.serif{font-family:Georgia,"Noto Serif SC","Songti SC",serif}
img{display:block;max-width:100%;height:auto}
a{color:#1565c0;text-decoration:none}
a:hover{text-decoration:underline}

.wrap{width:min(960px,calc(100% - 32px));margin:0 auto}

.site-top{padding:18px 0;border-bottom:1px solid #ececec;background:#fff;position:sticky;top:0;z-index:50}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:700;font-size:15px}
.brand img{width:38px;border-radius:9px}
.menu-btn{display:none;border:1px solid #d0d0d0;background:#fff;padding:7px 12px;border-radius:8px;font-size:14px;cursor:pointer}
.top-nav{display:flex;gap:20px;flex-wrap:wrap}
.top-nav a{color:#555;font-size:13px;font-weight:600}
.mnav{display:none;flex-direction:column;padding:12px 0 4px;border-top:1px solid #f0f0f0;margin-top:12px}
.mnav.open{display:flex}
.mnav a{padding:10px 0;border-bottom:1px solid #f5f5f5;color:#444;font-size:14px}

.hero{padding:36px 0 28px;text-align:center}
.hero h1{font-size:clamp(26px,4.5vw,38px);line-height:1.28;margin:0 0 14px;color:#111;font-weight:800}
.hero-lead{max-width:720px;margin:0 auto;font-size:17px;color:#555;line-height:1.7}
.hero-meta{margin-top:12px;font-size:13px;color:#999}

.compare-section{padding:8px 0 40px}
.compare-head{text-align:center;margin-bottom:24px}
.compare-head h2{font-size:22px;margin:0 0 8px;color:#111}
.compare-head p{margin:0;color:#666;font-size:15px}

.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -4px;padding:4px}
.compare-table{width:100%;min-width:640px;border-collapse:separate;border-spacing:0;border:1px solid #e0e0e0;border-radius:12px;overflow:hidden;background:#fff;box-shadow:0 4px 24px rgba(0,0,0,.04)}
.compare-table th,.compare-table td{padding:14px 16px;text-align:left;vertical-align:top;border-bottom:1px solid #ececec;font-size:14px;line-height:1.65}
.compare-table thead th{background:#f7f7f7;font-size:13px;font-weight:700;color:#333;letter-spacing:.02em}
.compare-table thead th:first-child{width:18%;min-width:100px}
.compare-table tbody tr:last-child td{border-bottom:none}
.compare-table tbody tr:nth-child(even) td{background:#fafafa}
.compare-table .dim{font-weight:700;color:#222;background:#f3f3f3!important;white-space:nowrap}
.compare-table .col-shuping{background:#fff8f0}
.compare-table .col-zhenren{background:#f5f9ff}
.compare-table .col-chang{background:#f8f8f8}
.compare-table thead .col-shuping{background:#fff3e0;color:#e65100}
.compare-table thead .col-zhenren{background:#e3f2fd;color:#1565c0}
.compare-table thead .col-chang{background:#eeeeee;color:#424242}
.tag-rec{display:inline-block;font-size:10px;background:#ff6f00;color:#fff;padding:2px 7px;border-radius:4px;margin-left:6px;vertical-align:middle;font-weight:700}
.cell-yes{color:#2e7d32;font-weight:600}
.cell-mid{color:#f57c00}
.cell-no{color:#757575}

.legend{display:flex;flex-wrap:wrap;justify-content:center;gap:16px 24px;margin-top:18px;font-size:13px;color:#666}
.legend span{display:flex;align-items:center;gap:6px}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px}
.legend .lg-shuping{background:#fff3e0;border:1px solid #ffcc80}
.legend .lg-zhenren{background:#e3f2fd;border:1px solid #90caf9}
.legend .lg-chang{background:#eee;border:1px solid #bdbdbd}

.content{padding:20px 0 56px}
.content h2{font-size:24px;margin:44px 0 16px;color:#111;font-weight:700}
.content h3{font-size:18px;margin:28px 0 12px;color:#222}
.content p{margin:0 0 18px;color:#333;font-size:16px;line-height:1.8}
.content ul,.content ol{margin:0 0 18px;padding-left:22px;color:#333}
.content li{margin-bottom:8px;line-height:1.75}

.tip-box{margin:28px 0;padding:18px 20px;background:#f9f9f9;border-left:4px solid #ff6f00;border-radius:0 8px 8px 0;font-size:15px;color:#444}
.tip-box strong{display:block;margin-bottom:6px;color:#111;font-size:14px}

.fig{margin:32px 0;text-align:center}
.fig img{margin:0 auto;border-radius:8px;border:1px solid #eee}
.fig figcaption{font-size:13px;color:#777;margin-top:10px}

.card-row{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:28px 0}
.card{border:1px solid #e8e8e8;border-radius:10px;padding:18px;background:#fff}
.card h3{margin:0 0 10px;font-size:16px}
.card p{margin:0;font-size:14px;color:#555;line-height:1.65}

.faq{margin:40px 0 0;padding-top:32px;border-top:1px solid #ececec}
.faq h2{font-size:22px;margin-bottom:16px}
.faq details{border-bottom:1px solid #ececec;padding:14px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:16px;color:#222;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq p{margin:10px 0 0;font-size:15px;color:#555}

.prose{padding:40px 0 56px}
.prose h1{font-size:32px;line-height:1.25;margin:0 0 18px}
.prose h2{font-size:21px;margin:32px 0 12px;color:#222}
.prose p,.prose li{font-size:16px;color:#333;line-height:1.8}
.related{margin-top:36px;padding:20px;border:1px solid #e8e8e8;border-radius:10px;background:#fafafa}
.related h3{margin:0 0 12px;font-size:14px;color:#666;letter-spacing:.04em}
.related a{display:block;padding:4px 0;font-size:15px}

.site-foot{padding:36px 0 44px;border-top:1px solid #ececec;font-size:13px;color:#888}
.site-foot a{color:#666;margin-right:14px}
.site-foot p{margin:12px 0 0}

.err{min-height:55vh;display:grid;place-items:center;text-align:center;padding:48px 20px}
.err h1{font-size:52px;margin:0 0 12px;color:#ccc}
.err p{font-size:16px;color:#666}

@media(max-width:720px){
  .menu-btn{display:block}
  .top-nav{display:none}
  .card-row{grid-template-columns:1fr}
  .compare-table th,.compare-table td{padding:11px 12px;font-size:13px}
  .hero{padding:28px 0 20px}
}