:root{--bg:hsl(6 30% 8%);--surface:hsl(6 25% 13%);--primary:hsl(6 70% 50%);--secondary:hsl(123 72% 56%);--text:#f4f7ff;--muted:hsl(6 16% 72%);--line:color-mix(in srgb,var(--text) 14%,transparent);--radius:0px;--max:1108px;--gap:20px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Georgia,"Microsoft YaHei",serif;line-height:1.72}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}.wrap{width:min(var(--max),92%);margin-inline:auto}
.site-header{z-index:25;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(18px);border:1px solid var(--line)}.nav{display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:9px;font-weight:900;white-space:nowrap}.brand img{width:34px;height:34px;object-fit:contain}.nav-links{display:flex;gap:clamp(10px,2vw,22px);font-size:14px;color:var(--muted)}.nav-links a:hover,.nav-links a[aria-current=page]{color:var(--primary)}.nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 19px;background:var(--primary);color:#fff;border-radius:var(--radius);font-weight:850}.button.secondary{background:transparent;color:var(--text);border:1px solid var(--line)}
.hero{padding:clamp(72px,9vw,128px) 0;background:radial-gradient(circle at 80% 20%,color-mix(in srgb,var(--primary) 25%,transparent),transparent 34%),linear-gradient(135deg,transparent,color-mix(in srgb,var(--secondary) 10%,transparent))}.hero-inner{display:grid;align-items:center;gap:clamp(28px,6vw,78px)}.hero h1{font-size:clamp(40px,6vw,76px);line-height:1.07;letter-spacing:-.035em;margin:18px 0}.hero p{font-size:clamp(16px,1.7vw,20px);color:var(--muted);max-width:760px}.eyebrow{display:inline-flex;color:var(--primary);font-weight:850;font-size:13px;letter-spacing:.04em}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.hero-media{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:calc(var(--radius) + 8px);box-shadow:0 26px 80px color-mix(in srgb,var(--primary) 15%,transparent)}.hero-media img{max-height:540px;margin:auto;object-fit:contain}
.crumbs{padding:16px 0;color:var(--muted);font-size:13px}.section{padding:clamp(58px,8vw,104px) 0}.section.alt{background:color-mix(in srgb,var(--surface) 72%,var(--bg))}.section-head{max-width:780px;margin-bottom:34px}.section-head h2{font-size:clamp(30px,4vw,48px);line-height:1.14;margin:0 0 12px}.section-head p,.muted{color:var(--muted)}.feature-grid{display:grid;gap:var(--gap)}.feature-card,.prose,.visual-card,details,.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(19px,3vw,30px)}.feature-card h2,.feature-card h3{margin:8px 0}.feature-card p,.prose p,.prose li,.step p,details p{color:var(--muted)}.number{color:var(--primary);font-weight:900}.content-grid{display:grid;grid-template-columns:1.16fr .84fr;gap:clamp(24px,5vw,64px);align-items:start}.visual-card{position:sticky;top:90px}.visual-card img{margin:auto;max-height:440px;object-fit:contain}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}.step{border-top:4px solid var(--primary)}details{margin:12px 0}summary{cursor:pointer;font-weight:850}.tag-list{display:flex;gap:8px;flex-wrap:wrap}.tag{padding:6px 10px;border-radius:999px;background:color-mix(in srgb,var(--primary) 13%,var(--surface));color:var(--primary);font-size:13px}.notice{padding:16px;border-left:4px solid var(--secondary);background:color-mix(in srgb,var(--secondary) 10%,var(--surface))}
.related-topics{padding:clamp(36px,5vw,66px) 0;border-top:1px solid var(--line)}.related-topics h2{font-size:clamp(22px,3vw,34px);margin:0 0 18px}.topic-grid{display:flex;flex-wrap:wrap;gap:10px}.topic-grid span{padding:9px 13px;border:1px solid var(--line);border-radius:var(--radius);color:var(--muted);background:var(--surface)}
.site-footer{padding:50px 0 26px;border-top:1px solid var(--line);background:color-mix(in srgb,var(--bg) 88%,#000)}.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:34px}.footer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;color:var(--muted)}.company{margin-top:28px;padding-top:18px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.site-header{position:relative}.nav{min-height:58px;border-left:8px solid var(--primary);padding-left:18px}.nav-links{margin-left:auto}.brand{font-size:19px}
.hero-inner{grid-template-columns:1fr;text-align:center}.hero-copy{max-width:850px;margin:auto}.hero-media{max-width:760px;margin:auto}.actions{justify-content:center}.feature-grid{grid-template-columns:repeat(4,1fr)}
.section:nth-of-type(odd){background:var(--surface)}
@media(max-width:920px){body{padding-left:0;padding-right:0;margin:0}.site-header{position:sticky;left:auto;right:auto;top:0;bottom:auto;width:auto;transform:none;border-radius:0}.nav{height:auto;min-height:68px;padding:0;flex-direction:row}.nav-links{display:none}.brand{width:auto;margin:0;padding:0;order:initial}.nav-cta{margin-left:auto;width:auto;order:initial}.hero{padding-top:72px;min-height:auto}.hero-inner,.content-grid{grid-template-columns:1fr}.hero-copy,.hero-media{grid-column:auto;grid-row:auto;order:initial;transform:none}.hero-media{position:relative;inset:auto;opacity:1}.feature-grid,.steps,.footer-grid{grid-template-columns:1fr}.feature-card{grid-column:auto;display:block;transform:none}.section-head{writing-mode:horizontal-tb;float:none;text-align:left}.visual-card{position:relative;top:auto}.footer-links{grid-template-columns:1fr 1fr}}