:root{
  --bg:hsl(164 34% 97%);--surface:hsl(164 45% 100%);--surface-2:hsl(164 40% 93%);
  --text:hsl(164 42% 13%);--muted:hsl(164 17% 39%);--accent:hsl(22 72% 42%);
  --accent-2:hsl(164 70% 45%);--line:hsl(164 24% 72% / .55);--button-text:hsl(0 0% 100%);
  --radius:28px;--shadow:0 24px 70px hsl(220 42% 20% / .10);--font:Georgia,"Microsoft YaHei UI",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100dvh;color:var(--text);background:var(--bg);font-family:var(--font);line-height:1.72}
body::before{content:"";position:fixed;inset:0;pointer-events:none;background:repeating-radial-gradient(circle at 80% 10%, transparent 0 22px, color-mix(in srgb, var(--line) 45%, transparent) 23px 24px);opacity:.72;z-index:-1}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.shell{width:min(1180px,calc(100% - 36px));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:20;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(18px)}
.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:21px;font-weight:900;white-space:nowrap}
.brand img{width:34px;height:34px;object-fit:contain}
.nav-links{display:flex;align-items:center;gap:20px;font-size:14px;font-weight:700;white-space:nowrap}
.nav-links a:hover{color:var(--accent)}
.cta,.secondary,.platform-download{display:inline-flex;align-items:center;justify-content:center;min-width:132px;min-height:48px;padding:0 22px;border:1px solid transparent;border-radius:calc(var(--radius) + 18px);font-weight:900;white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb;transition:transform .22s ease,box-shadow .22s ease}
.cta,.platform-download{color:var(--button-text);background:var(--accent);box-shadow:0 12px 34px color-mix(in srgb,var(--accent) 26%,transparent)}
.secondary{border-color:var(--line);background:var(--surface);color:var(--text)}
.cta:hover,.secondary:hover,.platform-download:hover{transform:translateY(-2px)}
.cta:active,.secondary:active,.platform-download:active{transform:translateY(1px)}
a:focus-visible,summary:focus-visible{outline:3px solid var(--accent-2);outline-offset:4px}
.hero{padding:clamp(38px,6vw,76px) 0}
.hero-layout{min-height:calc(100dvh - 150px);display:grid;grid-template-columns:minmax(300px,.82fr) minmax(0,1.18fr);align-items:center;gap:clamp(32px,6vw,88px)}
.hero-copy{text-align:right}
.hero-copy h1{max-width:14ch;margin:0 0 20px;font-size:clamp(40px,6vw,74px);line-height:1.06;letter-spacing:-.045em}
.hero-copy p{max-width:640px;margin:0 0 28px;color:var(--muted);font-size:clamp(17px,2vw,20px)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-media{order:-1;position:relative;align-self:center;min-width:0;padding:0;margin:0;overflow:visible;transform:none}
.hero-media::before{content:"";position:absolute;inset:8% -4% -4% 8%;border-radius:calc(var(--radius) * 2 + 20px);background:color-mix(in srgb,var(--accent) 17%,var(--surface));z-index:-1}
.hero-media img{display:block;width:100%;height:auto;object-fit:contain}
.section{padding:clamp(64px,9vw,118px) 0;border-bottom:1px solid var(--line)}
.section h2{max-width:18ch;margin:0 0 16px;font-size:clamp(30px,4.4vw,54px);line-height:1.12;letter-spacing:-.032em}
.section-intro{max-width:68ch;margin:0 0 34px;color:var(--muted)}
.surface{border:1px solid var(--line);border-radius:calc(var(--radius) + 10px);background:color-mix(in srgb,var(--surface) 94%,transparent);box-shadow:var(--shadow)}
.split{display:grid;grid-template-columns:.92fr 1.08fr;align-items:center;gap:clamp(28px,7vw,84px)}
.split.reverse{grid-template-columns:1.08fr .92fr}
.split.reverse .visual{order:2}
.visual{padding:0;margin:0;align-self:center}
.visual img{display:block;width:100%;height:auto;object-fit:contain}
.scenario-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.scenario{padding:20px;border-left:4px solid var(--accent);background:var(--surface)}
.scenario h3{margin:0 0 6px}
.scenario p{margin:0;color:var(--muted)}
.faq-stack{display:grid;gap:12px}
details{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:0 22px}
summary{cursor:pointer;list-style:none;padding:20px 0;font-weight:900}
details p{margin:0 0 22px;color:var(--muted)}
.platform-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.platform-card{display:flex;min-width:0;flex-direction:column;justify-content:space-between;gap:18px;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.platform-card h3{margin:0;font-size:20px}
.platform-card p{margin:8px 0 0;color:var(--muted);font-size:14px}
.platform-download{width:100%;min-width:0;padding-inline:14px}
.step-grid,.help-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.step,.help-card{padding:26px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.step h3,.help-card h3{margin:0 0 10px}
.step p,.help-card p{margin:0;color:var(--muted)}
.compat{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.compat article{padding:28px;background:var(--surface);border-left:5px solid var(--accent)}
.compat h3{margin:0 0 10px}
.compat p{margin:0;color:var(--muted)}
.site-footer{margin-top:40px;padding:48px 0 26px;border-top:1px solid var(--line);background:color-mix(in srgb,var(--surface-2) 74%,var(--bg))}
.footer-grid{display:grid;grid-template-columns:1.3fr .7fr .7fr;gap:32px}
.footer-grid h2,.footer-grid h3{margin-top:0}
.footer-grid p,.footer-grid a{color:var(--muted)}
.footer-grid a{display:block;margin:7px 0}
.copyright{margin-top:28px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
.breadcrumb{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:13px;padding:12px 0}
.breadcrumb a{color:var(--accent)}
.breadcrumb span{color:var(--line)}
.stats-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:40px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.stat-item{text-align:center}
.stat-item strong{display:block;font-size:clamp(28px,4vw,46px);color:var(--accent)}
.stat-item span{display:block;margin-top:8px;color:var(--muted);font-size:14px}
.compare-table{width:100%;border-collapse:collapse;margin-top:24px}
.compare-table th,.compare-table td{padding:18px 14px;text-align:left;border-bottom:1px solid var(--line)}
.compare-table th{background:var(--surface-2);font-weight:900}
.compare-table tr:last-child td{border-bottom:none}
.compare-table .check{color:var(--accent-2);font-weight:900}
.compare-table .cross{color:var(--accent);font-weight:900}
.testimonial-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:32px}
.testimonial-card{padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.testimonial-card p{margin:0 0 16px;color:var(--muted);font-style:italic}
.testimonial-card .author{display:flex;align-items:center;gap:12px}
.testimonial-card .author img{width:40px;height:40px;border-radius:50%;background:var(--surface-2)}
.testimonial-card .author-name{font-weight:900}
.testimonial-card .author-title{font-size:13px;color:var(--muted)}
.timeline{position:relative;padding-left:40px;margin-top:32px}
.timeline::before{content:"";position:absolute;left:12px;top:0;bottom:0;width:2px;background:var(--line)}
.timeline-item{position:relative;margin-bottom:32px}
.timeline-item::before{content:"";position:absolute;left:-34px;top:4px;width:16px;height:16px;border-radius:50%;background:var(--accent);border:3px solid var(--bg)}
.timeline-item h3{margin:0 0 8px}
.timeline-item p{margin:0;color:var(--muted)}
.timeline-date{display:block;font-size:12px;color:var(--accent);font-weight:900;margin-bottom:6px}
@media(max-width:920px){
  .nav{padding:13px 0;flex-wrap:wrap}.nav-links{order:3;width:100%;overflow-x:auto;padding-bottom:5px}
  .hero-layout,.split,.split.reverse{grid-template-columns:1fr}
  .hero-media{order:initial}
  .hero-copy{text-align:left}
  .scenario-list{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:repeat(2,1fr)}
  .stats-strip{grid-template-columns:1fr 1fr}
  .compare-table{display:block;overflow-x:auto}
  .testimonial-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .shell{width:min(100% - 24px,1180px)}.nav>.cta{display:none}.hero-layout{min-height:auto}
  .hero-copy h1{font-size:clamp(38px,13vw,58px)}.hero-actions{display:grid;grid-template-columns:1fr}
  .hero-actions a{width:100%}.step-grid,.help-grid,.compat,.footer-grid,.stats-strip,.testimonial-grid,.platform-grid{grid-template-columns:1fr}
  .platform-card{display:grid;grid-template-columns:1fr auto;align-items:center}
  .platform-download{min-width:150px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.cta,.secondary,.platform-download{transition:none}}