:root{--navy:#0b3558;--navy-2:#174f78;--orange:#ef861c;--ink:#172b3d;--muted:#5e7182;--line:#d9e3eb;--soft:#f3f7fa;--white:#fff;--max:1120px;color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:#fff;font-size:16px;line-height:1.75}.site-header{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px;padding:12px max(24px,calc((100vw - var(--max))/2));border-bottom:1px solid var(--line);background:rgba(255,255,255,.97);position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:12px;color:var(--navy);font-weight:800;text-decoration:none;white-space:nowrap}.brand img{width:45px;height:45px;object-fit:contain}.site-header nav{display:flex;align-items:center;gap:22px;flex-wrap:wrap}.site-header nav a{color:#365269;text-decoration:none;font-weight:650}.site-header nav a:hover,.site-header nav a:focus-visible{color:var(--orange)}main{max-width:var(--max);margin:0 auto;padding:0 24px 72px}.hero{padding:76px 0 62px;border-bottom:1px solid var(--line);background:radial-gradient(circle at 90% 15%,#e9f4fb 0,transparent 36%)}.eyebrow{margin:0 0 14px;color:var(--orange);font-weight:800;letter-spacing:.09em}h1{max-width:850px;margin:0;color:var(--navy);font-size:clamp(2.25rem,5vw,4.6rem);line-height:1.08;letter-spacing:-.035em}h2{color:var(--navy);font-size:clamp(1.55rem,3vw,2.2rem);line-height:1.25;margin:0 0 24px}.lead{max-width:840px;margin:24px 0 0;color:#425e72;font-size:1.2rem;line-height:1.85}.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}.hero-actions a{display:inline-flex;min-height:48px;align-items:center;justify-content:center;padding:10px 22px;border-radius:8px;text-decoration:none;font-weight:800}.primary{background:var(--orange);color:#fff}.secondary{border:1px solid #93abc0;color:var(--navy);background:#fff}section{padding:58px 0;border-bottom:1px solid var(--line)}section p,section ol,section ul{max-width:900px}ol{padding-left:1.5em}li+li{margin-top:12px}.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.guide-card{display:flex;flex-direction:column;gap:10px;padding:24px;border:1px solid var(--line);border-radius:12px;color:inherit;text-decoration:none;background:#fff;box-shadow:0 10px 25px rgba(11,53,88,.05)}.guide-card:hover,.guide-card:focus-visible{border-color:#84a9c4;transform:translateY(-2px)}.guide-card strong{color:var(--navy);font-size:1.15rem}.guide-card span{color:var(--muted)}.guide-card em{color:var(--orange);font-style:normal;font-weight:800}.metric-grid,.compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.metric-grid>div,.compare>div{padding:24px;background:var(--soft);border-left:4px solid var(--orange);border-radius:8px}.metric-grid b,.compare strong{display:block;margin-bottom:8px;color:var(--navy);font-size:1.12rem}.metric-grid span{color:#425e72}.compare p{margin:8px 0 0}.check-list{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.check-list li{margin:0;padding:15px 18px 15px 46px;background:var(--soft);border-radius:8px;position:relative}.check-list li:before{content:"✓";position:absolute;left:18px;color:var(--orange);font-weight:900}.split-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.split-links a{display:flex;flex-direction:column;padding:24px;color:inherit;text-decoration:none;border:1px solid var(--line);border-radius:12px}.split-links b{color:var(--navy);font-size:1.15rem}.split-links span{color:var(--muted)}.product-specs{border:1px solid var(--line);border-radius:12px;overflow:hidden}.product-specs dl{margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.product-specs dl>div{display:grid;grid-template-columns:130px 1fr;gap:18px;padding:17px 20px;border-bottom:1px solid var(--line)}.product-specs dl>div:nth-child(odd){border-right:1px solid var(--line)}.product-specs dt{font-weight:800;color:var(--navy)}.product-specs dd{margin:0;color:#425e72}.source-note{margin-top:58px;padding:24px;border-radius:12px;background:#fff6ea;border:1px solid #f1c98f}.source-note b{color:#8a4a00}.source-note p{margin:8px 0}.source-note span{color:#795f40;font-size:.9rem}footer{display:flex;justify-content:space-between;gap:20px;padding:28px max(24px,calc((100vw - var(--max))/2));background:var(--navy);color:#dbe8f1}footer a{color:#fff}@media(max-width:820px){.site-header{align-items:flex-start;flex-direction:column;gap:10px;position:static}.site-header nav{gap:10px 18px}.hero{padding:48px 0 42px}.card-grid,.metric-grid,.compare,.check-list,.split-links,.product-specs dl{grid-template-columns:1fr}.product-specs dl>div:nth-child(odd){border-right:0}.product-specs dl>div{grid-template-columns:110px 1fr}section{padding:42px 0}footer{flex-direction:column}}@media(max-width:520px){body{font-size:16px}.site-header,main{padding-left:18px;padding-right:18px}.brand span{font-size:.95rem}.site-header nav a{font-size:.9rem}h1{font-size:2.25rem}.lead{font-size:1.05rem}.hero-actions a{width:100%}.product-specs dl>div{grid-template-columns:1fr;gap:4px}}