:root{--ink:#142823;--ink-2:#25443b;--muted:#667b74;--line:#dce9e4;--line-strong:#c7dbd3;--paper:#f8fbf9;--surface:#fff;--soft:#edf7f2;--soft-2:#f5f1e8;--green:#0c6b50;--green-2:#075640;--green-3:#168264;--gold:#b88a43;--gold-soft:#f3ead9;--shadow-sm:0 8px 24px rgba(18,61,48,.07);--shadow:0 18px 55px rgba(18,61,48,.11);--radius:20px;--radius-lg:30px;--max:1160px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(180deg,#fff 0,#f8fbf9 44%,#f4f8f6 100%);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}body:before{content:"";display:block;height:4px;background:linear-gradient(90deg,var(--green-2),var(--green-3) 62%,var(--gold))}a{color:inherit;text-decoration:none;transition:color .22s ease,background .22s ease,border-color .22s ease,transform .22s ease,box-shadow .22s ease}img{max-width:100%;height:auto}::selection{background:#cde9dc;color:var(--green-2)}
.site-header{max-width:var(--max);margin:auto;padding:18px 28px;display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:14px;min-width:0}.brand-mark{position:relative;width:52px;height:52px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(145deg,var(--green-3),var(--green-2));color:#fff;font-weight:900;letter-spacing:.08em;box-shadow:0 10px 24px rgba(12,107,80,.22)}.brand-mark:after{content:"";position:absolute;inset:5px;border:1px solid rgba(255,255,255,.3);border-radius:13px}.brand strong,.brand small{display:block}.brand strong{font-size:20px;letter-spacing:.015em}.brand small{color:var(--muted);font-size:12px;margin-top:1px}.phone{display:inline-flex;align-items:center;gap:8px;color:var(--green-2);font-weight:800;border:1px solid var(--line-strong);padding:10px 16px;border-radius:999px;background:#fff;box-shadow:var(--shadow-sm)}.phone:before{content:"☎";width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--soft);font-size:13px}.phone:hover{color:#fff;background:var(--green);border-color:var(--green);transform:translateY(-1px)}
.main-nav{border-block:1px solid var(--line);display:flex;justify-content:center;gap:8px;padding:8px 20px;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);position:sticky;top:0;z-index:50;box-shadow:0 8px 24px rgba(18,61,48,.04)}.main-nav a{position:relative;padding:8px 18px;border-radius:999px;font-size:15px}.main-nav a:hover{color:var(--green);background:var(--soft)}.main-nav .active{color:#fff;background:linear-gradient(135deg,var(--green),var(--green-2));font-weight:700;box-shadow:0 7px 16px rgba(12,107,80,.19)}
.hero{position:relative;isolation:isolate;max-width:var(--max);margin:42px auto 28px;padding:74px 70px;border-radius:var(--radius-lg);overflow:hidden;background:radial-gradient(circle at 82% 15%,rgba(184,138,67,.18),transparent 25%),linear-gradient(135deg,#e2f2eb 0%,#f8f5ec 100%);border:1px solid rgba(12,107,80,.1);box-shadow:var(--shadow)}.hero:before{content:"";position:absolute;z-index:-1;width:330px;height:330px;border-radius:50%;right:-95px;bottom:-160px;border:54px solid rgba(12,107,80,.07)}.hero:after{content:"HUAYAN";position:absolute;z-index:-1;right:42px;top:30px;color:rgba(12,107,80,.055);font-weight:900;font-size:clamp(48px,8vw,105px);letter-spacing:.08em;line-height:1}.eyebrow{display:inline-flex;align-items:center;gap:9px;color:var(--green);text-transform:uppercase;letter-spacing:.16em;font-weight:900;font-size:12px}.eyebrow:before{content:"";width:22px;height:2px;background:var(--gold)}.hero h1{font-size:clamp(36px,5.2vw,64px);line-height:1.14;letter-spacing:-.025em;max-width:900px;margin:18px 0 20px}.answer{font-size:18px;color:var(--ink-2);max-width:850px;line-height:1.9}.actions{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 21px;border:1px solid var(--green);border-radius:12px;color:var(--green);background:#fff;font-weight:800;box-shadow:0 5px 15px rgba(18,61,48,.05)}.button:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(12,107,80,.15)}.button.primary{background:linear-gradient(135deg,var(--green-3),var(--green-2));color:#fff;border-color:transparent}.button.block{display:flex;width:100%;margin-top:20px}.facts{display:grid;grid-template-columns:repeat(3,1fr);padding:24px 0 0;margin:36px 0 0;border-top:1px solid rgba(12,107,80,.18);list-style:none;gap:20px}.facts li{color:var(--muted);font-size:14px}.facts b{display:block;color:var(--ink);font-size:15px;margin-bottom:2px}
.section{max-width:var(--max);margin:auto;padding:64px 28px}.section.soft{max-width:none;padding-inline:max(28px,calc((100% - var(--max))/2 + 28px));background:linear-gradient(180deg,#eef7f3,#e8f3ee);border-block:1px solid #dcebe5}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px}.section-head h2,.trust h2,.page-intro h1{margin:8px 0 0;font-size:clamp(29px,4vw,42px);line-height:1.22;letter-spacing:-.02em}.section-head>a{color:var(--green);font-weight:800;white-space:nowrap}.section-head>a:hover{transform:translateX(3px)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{position:relative;display:flex;flex-direction:column;min-height:270px;background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:var(--radius);padding:27px;overflow:hidden;box-shadow:var(--shadow-sm)}.card:after{content:"";position:absolute;right:-35px;top:-35px;width:90px;height:90px;border-radius:50%;background:var(--soft);transition:transform .3s ease}.card:hover{transform:translateY(-5px);border-color:#b9d8cb;box-shadow:var(--shadow)}.card:hover:after{transform:scale(1.35)}.card h3{position:relative;font-size:20px;line-height:1.5;margin:17px 0 8px}.card p,.trust p,.article-list p{color:var(--muted)}.card .text-link{margin-top:auto;padding-top:14px}.tag{display:inline-flex;align-self:flex-start;font-size:12px;color:var(--green);background:var(--soft);padding:5px 10px;border-radius:999px;font-weight:800}.text-link{display:inline-flex;align-items:center;color:var(--green);font-weight:800}.text-link:hover{color:var(--green-2)}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;list-style:none;padding:0}.steps li{position:relative;background:#fff;border:1px solid var(--line);border-radius:18px;padding:25px;overflow:visible;box-shadow:var(--shadow-sm)}.steps li:not(:last-child):after{content:"→";position:absolute;right:-12px;top:50%;z-index:2;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--gold);color:#fff;font-size:13px}.steps b{color:var(--gold);display:block;font-size:29px;line-height:1;margin-bottom:18px}.steps strong,.steps span{display:block}.steps strong{font-size:18px}.steps span,.note{color:var(--muted);font-size:14px;margin-top:5px}.trust{display:grid;grid-template-columns:1.25fr 1fr;gap:58px;align-items:center}.trust>div{padding-right:20px}.trust dl{margin:0;background:#fff;border:1px solid var(--line);padding:8px 24px;border-radius:var(--radius);box-shadow:var(--shadow-sm)}.trust dl div{display:flex;justify-content:space-between;gap:20px;padding:16px 0;border-bottom:1px solid var(--line)}.trust dl div:last-child{border-bottom:0}dt{color:var(--muted)}dd{margin:0;font-weight:800;text-align:right}.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 20px;margin:12px 0;box-shadow:0 5px 16px rgba(18,61,48,.04)}.faq summary{position:relative;font-weight:800;cursor:pointer;padding:18px 34px 18px 0;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";position:absolute;right:2px;top:16px;color:var(--green);font-size:24px;line-height:1}.faq details[open] summary:after{content:"−"}.faq details p{color:var(--muted);padding:0 0 18px;margin:0}
.site-footer{position:relative;background:linear-gradient(135deg,#102b23,#173b30);color:#dceae4;margin-top:54px;padding:48px max(28px,calc((100% - var(--max))/2 + 28px));display:grid;grid-template-columns:1fr auto;gap:18px;overflow:hidden}.site-footer:after{content:"华研";position:absolute;right:4%;bottom:-38px;color:rgba(255,255,255,.035);font-size:140px;font-weight:900}.site-footer strong{color:#fff;font-size:19px}.site-footer a{position:relative;z-index:1;margin-left:22px;color:#e6f1ed}.site-footer a:hover{color:#dfbc7d}.site-footer p{margin:7px 0;color:#b8cbc3}.site-footer .disclaimer{grid-column:1/-1;border-top:1px solid #36574c;padding-top:17px;font-size:13px;color:#9db4aa}
.page-shell{max-width:var(--max);margin:auto;padding:26px 28px}.breadcrumb{font-size:13px;color:var(--muted);margin:10px 0 24px}.breadcrumb a:hover{color:var(--green)}.page-intro{position:relative;overflow:hidden;background:linear-gradient(135deg,#e8f5ef,#f8f4ea);padding:42px 44px;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:30px;box-shadow:var(--shadow-sm)}.page-intro:after{content:"";position:absolute;right:-45px;top:-85px;width:190px;height:190px;border:35px solid rgba(12,107,80,.06);border-radius:50%}.page-intro p{color:var(--muted);max-width:850px;margin-bottom:0}.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:30px}.article-list{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:0 28px;box-shadow:var(--shadow-sm)}.article-list article{padding:28px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:26px}.article-list article:last-of-type{border-bottom:0}.article-list h2{margin:6px 0;font-size:23px;line-height:1.45}.article-list h2 a:hover{color:var(--green)}.article-list time,.article-meta{font-size:13px;color:var(--muted)}.sidebar{align-self:start;position:sticky;top:82px;background:linear-gradient(180deg,#fff,#f7faf8);border:1px solid var(--line);border-radius:var(--radius);padding:25px;box-shadow:var(--shadow-sm)}.sidebar h2{margin-top:0;font-size:20px}.sidebar dt{margin-top:13px;font-size:13px}.sidebar dd{text-align:left}.pagination{padding:30px 0}.pagination li{display:inline-block;list-style:none;margin-right:6px}.pagination a,.pagination span{display:inline-block;padding:7px 12px;background:#fff;border:1px solid var(--line);border-radius:8px}.pagination a:hover{color:#fff;background:var(--green);border-color:var(--green)}
.article-body{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(26px,5vw,56px);min-width:0;box-shadow:var(--shadow-sm)}.article-body h1{font-size:clamp(30px,5vw,48px);line-height:1.25;letter-spacing:-.02em;margin:13px 0}.article-meta{display:flex;flex-wrap:wrap;gap:15px;padding-bottom:25px;border-bottom:1px solid var(--line)}.direct-answer{background:linear-gradient(135deg,var(--soft),#f6faf8);border-left:4px solid var(--green);padding:20px 22px;margin:28px 0;border-radius:0 13px 13px 0}.direct-answer p{margin:7px 0}.prose{font-size:17px;line-height:1.95}.prose h2{font-size:28px;margin:2em 0 .7em;padding-left:14px;border-left:4px solid var(--gold);line-height:1.35}.prose h3{font-size:21px;margin-top:1.6em}.prose p{margin:1em 0}.prose img{display:block;margin:26px auto;border-radius:14px;box-shadow:var(--shadow-sm)}.prose table{width:100%;border-collapse:separate;border-spacing:0;overflow:hidden;border:1px solid var(--line);border-radius:12px}.prose td,.prose th{border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:11px}.prose th{background:var(--soft)}.article-body a{color:var(--green)}.review-box{margin-top:38px;padding:23px;border:1px solid var(--line);border-radius:14px;background:#fafcfb}.review-box h2{font-size:19px;margin-top:0}.prev-next{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:30px 0}.prev-next>div{padding:16px;background:var(--soft);border-radius:11px}.related{margin-top:36px}
@media(max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}.steps{grid-template-columns:repeat(2,1fr)}.steps li:nth-child(2):after{display:none}.layout{grid-template-columns:minmax(0,1fr) 270px}.hero{margin-inline:18px;padding:56px 42px}}
@media(max-width:780px){body:before{height:3px}.site-header{padding:13px 16px}.brand{gap:10px}.brand strong{font-size:16px}.brand small{display:none}.brand-mark{width:42px;height:42px;border-radius:14px}.phone{font-size:12px;padding:7px 10px;box-shadow:none}.phone:before{display:none}.main-nav{justify-content:flex-start;overflow-x:auto;scrollbar-width:none;gap:5px;padding:7px 12px}.main-nav::-webkit-scrollbar{display:none}.main-nav a{white-space:nowrap;padding:7px 13px}.hero{margin:18px 12px 22px;padding:38px 24px;border-radius:22px}.hero:after{right:10px;font-size:48px}.hero h1{font-size:34px}.answer{font-size:16px}.facts{grid-template-columns:1fr;gap:12px}.facts li{padding-left:14px;border-left:2px solid var(--gold)}.cards,.steps,.trust,.layout{grid-template-columns:1fr}.section{padding:46px 16px}.section.soft{padding-inline:16px}.section-head{align-items:flex-start}.section-head>a{font-size:13px}.card{min-height:auto}.steps li:after{display:none!important}.site-footer{grid-template-columns:1fr;padding:38px 20px}.site-footer a{margin:0 16px 0 0}.sidebar{position:static}.page-shell{padding:16px}.page-intro{padding:30px 22px}.article-list{padding:0 20px}.article-list article{display:block}.article-list .text-link{margin-top:10px}.article-body{padding:27px 20px}.prev-next{grid-template-columns:1fr}.prose{font-size:16px}.trust>div{padding-right:0}}
@media(max-width:480px){.brand strong{font-size:15px}.phone{font-size:11px}.hero h1{font-size:30px}.actions .button{flex:1}.section-head h2,.trust h2,.page-intro h1{font-size:28px}.cards{grid-template-columns:1fr}.site-footer:after{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
.back-to-top{position:fixed;right:22px;bottom:24px;z-index:60;width:44px;height:44px;border:0;border-radius:14px;background:linear-gradient(145deg,var(--green-3),var(--green-2));color:#fff;font-size:20px;cursor:pointer;box-shadow:0 12px 28px rgba(12,107,80,.28);opacity:0;visibility:hidden;transform:translateY(10px);transition:.22s ease}.back-to-top.is-visible{opacity:1;visibility:visible;transform:none}.back-to-top:hover{transform:translateY(-2px)}.ui-ready .reveal-item{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}.ui-ready .reveal-item.is-visible{opacity:1;transform:none}@media(max-width:780px){.back-to-top{right:14px;bottom:16px;width:40px;height:40px;border-radius:12px}}@media(prefers-reduced-motion:reduce){.ui-ready .reveal-item{opacity:1;transform:none}}
.pagination{display:flex;flex-wrap:wrap;align-items:center;gap:7px}.pagination a,.pagination span{display:inline-flex;align-items:center;justify-content:center;min-width:38px;padding:8px 12px;margin:0;background:#fff;border:1px solid var(--line);border-radius:9px}.pagination a:hover,.pagination .current{color:#fff;background:var(--green);border-color:var(--green)}.pagination .current{font-weight:800}.pagination .disabled{color:#a6b3ae;background:#f4f7f5;cursor:not-allowed}@media(max-width:480px){.pagination{gap:5px}.pagination a,.pagination span{min-width:34px;padding:7px 9px;font-size:13px}}