/* roulang page: index */
:root{--amber:#D89012;--amber-deep:#B8740C;--amber-soft:#F3E2C0;--copper:#9A5A32;--teal:#2F6A55;--ink:#161C1B;--graphite:#2A3230;--muted:#5C6663;--line:#D8D2C6;--paper:#FBF8F2;--rice:#F4EFE4;--sage:#E7EEE9;--dark:#121716;--danger:#8C3A2A;--radius:10px;--radius-sm:6px;--shadow:0 8px 24px rgba(22,28,27,.08);--shadow-hover:0 12px 28px rgba(22,28,27,.12);--container:1240px;--serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;--sans:"PingFang SC","Microsoft YaHei","Noto Sans SC","Hiragino Sans GB",sans-serif}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}html,body{margin:0;padding:0}
body{font-family:var(--sans);font-size:16px;line-height:1.82;color:var(--ink);background:var(--paper);overflow-x:hidden}
img{max-width:100%;height:auto;display:block}a{color:var(--copper);text-decoration:none;transition:color .2s ease,transform .2s ease}a:hover{color:var(--amber-deep)}
button,input,select,textarea{font-family:inherit;font-size:16px}button{cursor:pointer}
h1,h2,h3{font-family:var(--serif);color:var(--ink);margin:0 0 12px;line-height:1.28}
h1{font-size:44px}h2{font-size:28px}h3{font-size:19px}p{margin:0 0 16px;color:var(--graphite);max-width:46em}
.container{width:min(100% - 48px,var(--container));margin:0 auto}.section{padding:88px 0}
.section-rice{background:var(--rice)}.section-sage{background:var(--sage)}.section-paper{background:var(--paper)}
.kicker{display:inline-flex;align-items:center;gap:8px;color:var(--copper);font-size:13px;letter-spacing:.12em;margin-bottom:10px;font-weight:600}
.kicker::before{content:"";width:22px;height:2px;background:var(--amber)}.lead{color:var(--muted);margin-bottom:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:6px;border:2px solid transparent;font-weight:650;transition:transform .18s ease,background .18s ease,border-color .18s ease,box-shadow .18s ease}
.btn-primary{background:var(--amber);color:var(--ink)}.btn-primary:hover{background:var(--amber-deep);color:var(--paper);transform:translateY(-3px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:var(--paper);border-color:rgba(251,248,242,.55)}.btn-ghost:hover{border-color:var(--amber);color:var(--amber);transform:translateY(-3px)}
.btn-line{background:transparent;color:var(--graphite);border-color:var(--graphite)}.btn-line:hover{border-color:var(--amber);color:var(--ink);transform:translateY(-3px)}
.btn:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,button:focus-visible{outline:2px solid var(--copper);outline-offset:3px}
.badge{display:inline-flex;background:var(--amber-soft);color:var(--ink);border-radius:4px;padding:4px 9px;font-size:12px;font-weight:650}
.site-header{position:sticky;top:0;z-index:80}
.util-bar{height:40px;background:var(--graphite);color:#E8E4DA;display:flex;align-items:center;font-size:13px}
.util-inner,.main-inner{display:flex;justify-content:space-between;gap:16px;align-items:center;width:min(100% - 48px,var(--container));margin:0 auto}
.util-left,.util-right{display:flex;gap:22px;flex-wrap:wrap}.util-bar a{color:#E8E4DA}.util-bar a:hover{color:var(--amber)}
.main-bar{height:72px;background:rgba(251,248,242,.96);border-bottom:1px solid var(--line)}.main-inner{height:72px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-family:var(--serif);font-size:20px;font-weight:700}
.logo-mark{width:34px;height:34px;border:1.5px solid var(--copper);border-radius:4px;position:relative;background:linear-gradient(180deg,transparent 48%,rgba(216,144,18,.35) 48%,rgba(216,144,18,.35) 52%,transparent 52%),repeating-linear-gradient(90deg,rgba(22,28,27,.18) 0 1px,transparent 1px 6px),repeating-linear-gradient(0deg,rgba(22,28,27,.12) 0 1px,transparent 1px 6px)}
.logo-mark::after{content:"";position:absolute;left:4px;right:4px;top:6px;height:10px;border:1.5px solid var(--amber);border-bottom:0;border-radius:12px 12px 0 0}
.nav-links{display:flex;align-items:center;gap:4px}.nav-links a{position:relative;color:var(--graphite);padding:8px 10px;font-size:15px;font-weight:550}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}.nav-links a.active::after,.nav-links a:hover::after{content:"";position:absolute;left:10px;right:10px;bottom:2px;height:2px;background:var(--amber)}
.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:var(--paper);border-radius:6px;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.menu-toggle span{width:18px;height:2px;background:var(--ink);display:block}.util-phone{display:none;color:var(--ink);font-weight:650;min-height:44px;align-items:center}body.nav-open{overflow:hidden}
.hero{position:relative;min-height:640px;background:var(--dark);color:var(--paper);overflow:hidden}
.hero-slides{position:absolute;inset:0}.hero-slide{position:absolute;inset:0;opacity:0;transition:opacity .7s ease;background-size:cover;background-position:center}
.hero-slide::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(18,23,22,.8),rgba(18,23,22,.45) 55%,rgba(18,23,22,.25)),repeating-linear-gradient(90deg,rgba(255,255,255,.035) 0 1px,transparent 1px 6px)}
.hero-slide.is-active{opacity:1;z-index:1}
.hero-slide .hero-copy{position:absolute;left:50%;transform:translateX(-50%);width:min(100% - 48px,var(--container));z-index:2;padding-top:108px;max-width:760px}
.hero-slide h1,.hero-slide .frame-title{color:var(--paper);font-size:46px;margin-bottom:18px;font-family:var(--serif);line-height:1.28}
.hero-slide p{color:#E6E1D6;font-size:17px;line-height:1.86}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.hero-nav{position:absolute;z-index:3;right:24px;bottom:28px;display:flex;gap:10px}
.hero-arrow{width:44px;height:44px;border:1px solid rgba(251,248,242,.4);background:rgba(18,23,22,.35);color:var(--paper);border-radius:6px}
.hero-dots{position:absolute;z-index:3;left:0;right:0;bottom:28px;display:flex;justify-content:center;gap:8px}
.hero-dots button{width:28px;height:3px;border:0;background:rgba(251,248,242,.35);padding:0}.hero-dots button.is-active{background:var(--amber)}
.meter-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.meter{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:22px 20px 18px;box-shadow:var(--shadow);position:relative}
.meter::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--amber)}
.meter .num{font-family:var(--serif);font-variant-numeric:tabular-nums;font-size:36px;line-height:1}.meter .unit{font-size:13px;color:var(--amber-deep);margin-left:6px;font-weight:700}
.meter h3{margin:12px 0 6px;font-size:16px}.meter p{font-size:13px;color:var(--muted);margin:0}
.gauge{height:6px;background:#E8E0D2;border-radius:99px;margin:14px 0 10px;overflow:hidden}.gauge>span{display:block;height:100%;background:linear-gradient(90deg,var(--copper),var(--amber))}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.cover-frame{position:relative;border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}.cover-frame img{width:100%;height:460px;object-fit:cover}
.cover-cap{position:absolute;left:16px;bottom:16px;background:rgba(18,23,22,.82);color:var(--paper);padding:8px 12px;font-size:13px;border-left:3px solid var(--amber)}
.spec-list{margin:18px 0 0;padding:0;list-style:none}.spec-list li{display:grid;grid-template-columns:92px 1fr;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}.spec-list b{color:var(--copper)}
.matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.matrix-card{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:22px;box-shadow:var(--shadow);transition:transform .2s ease,box-shadow .2s ease}
.matrix-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.matrix-card .ico{width:42px;height:42px;margin-bottom:14px;background:repeating-linear-gradient(90deg,rgba(154,90,50,.35) 0 1px,transparent 1px 7px),repeating-linear-gradient(0deg,rgba(154,90,50,.22) 0 1px,transparent 1px 7px);border:1px solid rgba(154,90,50,.35);border-radius:6px}
.matrix-card h3{border-top:1px solid #C8A07A;padding-top:12px}.matrix-card p{font-size:15px;min-height:6.8em}
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.product-card{background:var(--paper);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:transform .2s ease}
.product-card:hover{transform:translateY(-4px)}.product-card img{width:100%;height:210px;object-fit:cover}
.product-body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.params{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin:8px 0 14px;background:var(--rice);border-radius:8px;padding:10px}
.params div{font-size:12px;color:var(--muted)}.params strong{display:block;color:var(--ink);font-size:14px;margin-top:2px}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)}
table.compare{width:100%;border-collapse:collapse;min-width:720px;background:var(--paper)}
.compare th,.compare td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
.compare thead th{background:var(--graphite);color:var(--paper)}.compare tbody tr:nth-child(even){background:#F6F1E6}
.compare td.hl{background:#F7E7C4;font-weight:650}.compare .good{color:var(--teal);font-weight:700}
.scene-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.scene-tabs button{min-height:44px;padding:0 14px;border:1px solid var(--line);background:var(--paper);border-radius:6px;color:var(--graphite)}
.scene-tabs button.is-active{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.scene-panel{display:none;grid-template-columns:1.1fr .9fr;gap:28px;align-items:center;background:var(--paper);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.scene-panel.is-active{display:grid}.scene-panel img{width:100%;height:340px;object-fit:cover}.scene-copy{padding:28px}
.cases{background:var(--dark);color:var(--paper);padding:92px 0;position:relative}
.cases::before{content:"";position:absolute;inset:0;opacity:.18;background:repeating-linear-gradient(90deg,rgba(255,255,255,.08) 0 1px,transparent 1px 5px),repeating-linear-gradient(0deg,rgba(255,255,255,.05) 0 1px,transparent 1px 5px);pointer-events:none}
.cases h2,.cases p,.cases h3{color:var(--paper)}.case-list{display:grid;gap:16px;position:relative}
.case-item{display:grid;grid-template-columns:180px 1fr auto;gap:20px;align-items:center;padding:22px;border:1px solid rgba(251,248,242,.12);background-size:cover;border-radius:10px;position:relative;overflow:hidden}
.case-item::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(18,23,22,.88),rgba(18,23,22,.55))}
.case-item>*{position:relative}.case-item .tag{color:var(--amber);font-size:13px}
.timeline{position:relative}.timeline::before{content:"";position:absolute;left:18px;top:8px;bottom:8px;width:2px;background:#D7C8AE}
.tl-item{display:grid;grid-template-columns:36px 120px 1fr;gap:16px;padding:16px 0}
.dot{width:16px;height:16px;border-radius:50%;background:var(--amber);margin-top:6px;position:relative;z-index:1;box-shadow:0 0 0 6px var(--rice)}.dot.done{background:var(--teal)}
.tl-year{font-family:var(--serif);color:var(--copper);font-weight:700}
.stories{display:grid;gap:22px}.story{display:grid;grid-template-columns:180px 1fr;background:var(--paper);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.story img{width:100%;height:100%;min-height:180px;object-fit:cover}.story-copy{padding:22px}
.story blockquote{margin:0 0 12px;font-size:17px;color:var(--ink);font-family:var(--serif)}.role{color:var(--muted);font-size:13px}
.stats{background:var(--graphite);color:var(--paper);padding:36px 0}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.stat .n{font-family:var(--serif);font-size:40px;color:var(--amber);line-height:1}.stat p{color:#D8D3C8;margin:8px 0 0;font-size:14px}
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.review{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:20px;box-shadow:var(--shadow)}
.avatar{width:40px;height:40px;background:var(--sage);display:grid;place-items:center;font-family:var(--serif);font-weight:700;border-radius:4px;margin-bottom:12px}
.news-list{display:grid;gap:14px}.news-item{display:grid;grid-template-columns:220px 1fr;gap:18px;background:var(--paper);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.news-item img{width:100%;height:150px;object-fit:cover}.news-body{padding:16px 18px 16px 0}.news-body time{color:var(--copper);font-size:13px}.news-body p{font-size:15px;margin:0}
.more-link{display:inline-block;margin-top:16px;font-weight:650;color:var(--ink);border-bottom:2px solid var(--amber)}
.certs{display:grid;gap:12px}.cert{display:grid;grid-template-columns:110px 1fr 90px;gap:16px;align-items:center;background:var(--paper);border:1px dashed #C2B59C;padding:16px 18px;border-radius:8px}
.cert .stamp{width:64px;height:64px;border:2px solid var(--teal);color:var(--teal);border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700}
.quick-list{display:grid;gap:8px}.quick-list a{display:flex;align-items:center;min-height:48px;padding:10px 14px;background:var(--paper);border:1px solid var(--line);border-radius:8px;color:var(--ink)}
.quick-list a:hover{border-color:var(--amber);transform:translateY(-2px)}
.faq-item{border-bottom:1px solid var(--line);background:var(--paper)}
.faq-item button{width:100%;min-height:56px;text-align:left;background:transparent;border:0;padding:0 8px;display:flex;justify-content:space-between;align-items:center;font-weight:650;color:var(--ink)}
.faq-item .panel{display:none;background:var(--rice);padding:4px 12px 16px}.faq-item.is-open .panel{display:block}.faq-item .panel p{margin:0;font-size:15px}
.plus{width:22px;height:22px;border:1px solid var(--copper);color:var(--copper);display:grid;place-items:center;border-radius:3px}
.contact-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px}
form.lead-form{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:24px;box-shadow:var(--shadow)}
.field{margin-bottom:14px}.field label{display:block;margin-bottom:6px;font-weight:650}
.field input,.field select,.field textarea{width:100%;height:48px;border:1px solid var(--line);border-radius:6px;padding:0 12px;background:#FFFcf8}
.field textarea{height:110px;padding:10px 12px;resize:vertical}.field.error input,.field.error select,.field.error textarea{border-color:var(--danger)}
.err{display:none;color:var(--danger);font-size:13px;margin-top:4px}.field.error .err{display:block}
.form-note{min-height:24px;font-size:14px;margin-top:8px}.form-note.ok{color:var(--teal)}.form-note.bad{color:var(--danger)}
.contact-aside{background:var(--rice);border-radius:12px;padding:24px;border:1px solid var(--line)}
.site-footer{background:var(--dark);color:#D9D4C8;padding:56px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.1fr;gap:28px}.site-footer h3{color:var(--paper);font-size:18px}
.site-footer a{color:#D9D4C8}.site-footer a:hover{color:var(--amber)}.site-footer ul{list-style:none;margin:0;padding:0}.site-footer li{margin:8px 0}
.legal{margin-top:28px;padding-top:18px;border-top:1px solid rgba(255,255,255,.08);font-size:13px;color:#A8A399}.fold summary{cursor:pointer;color:#C9C2B4}
.mobile-compare{display:none}
@media(max-width:1440px){h1,.hero-slide h1,.hero-slide .frame-title{font-size:40px}}
@media(max-width:1024px){.meter-grid,.matrix,.product-grid,.reviews,.stats-grid,.footer-grid{grid-template-columns:repeat(2,1fr)}.split,.scene-panel.is-active,.story,.contact-grid,.news-item,.case-item{grid-template-columns:1fr}.cover-frame img,.scene-panel img{height:320px}h1,.hero-slide h1,.hero-slide .frame-title{font-size:34px}.nav-links{display:none}.menu-toggle{display:flex}.nav-links.open{display:flex;flex-direction:column;position:fixed;inset:112px 0 0 auto;width:min(86vw,360px);background:var(--paper);padding:18px;box-shadow:var(--shadow);z-index:90;overflow:auto}.nav-links.open a{min-height:44px;display:flex;align-items:center;font-size:16px}}
@media(max-width:768px){.util-bar{display:none}.util-phone{display:inline-flex}.main-bar,.main-inner{height:64px}.nav-links.open{inset:64px 0 0 auto}.container,.hero-slide .hero-copy{width:min(100% - 32px,var(--container))}.section{padding:64px 0}.hero{min-height:560px}.hero-slide .hero-copy{padding-top:72px}h1,.hero-slide h1,.hero-slide .frame-title{font-size:30px}h2{font-size:24px}.meter-grid,.stats-grid{grid-template-columns:1fr 1fr}.matrix,.product-grid,.reviews,.footer-grid{grid-template-columns:1fr}.table-wrap table{display:none}.mobile-compare{display:grid;gap:10px}.mc-card{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:14px}.hero-nav{display:none}.logo{font-size:17px}}
@media(max-width:520px){.meter-grid{grid-template-columns:1fr}.params{grid-template-columns:1fr}.cert{grid-template-columns:1fr}.tl-item{grid-template-columns:28px 1fr}.tl-year{grid-column:2}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}