/* ===== 玉山吉墅官网 · 高级配色 + 动效 ===== */
:root{
  --green:#c8a366; --green-dark:#171b19; --green-light:#f4eee1;
  --gold:#c8a366; --gold-2:#e9d8b8; --gold-deep:#a8824a;
  --ink:#252a27; --gray:#7a807b; --line:#eae5da; --bg:#f7f5f0; --white:#fff;
  --dark:#161a18; --dark-2:#1e2421; --dark-3:#262c29;
  --radius:18px; --radius-sm:12px;
  --shadow:0 14px 44px rgba(22,26,24,.12);
  --shadow-sm:0 4px 18px rgba(22,26,24,.08);
  --serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:var(--bg);line-height:1.78;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--gold-deep);text-decoration:none;transition:color .25s var(--ease)}
a:hover{color:var(--dark)}
img{max-width:100%;display:block}
.container{max-width:1180px;margin:0 auto;padding:0 22px}
h1,h2,h3,h4{line-height:1.42;font-weight:700;color:var(--ink);letter-spacing:.5px}
h1{font-size:30px}
h2{font-size:24px;margin:0 0 18px}
h3{font-size:19px}

/* 滚动进度条 */
#scrollProgress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--gold),var(--gold-2));z-index:1000;transition:width .1s linear}

/* 顶栏 */
.topbar{background:var(--dark);color:#d9d3c6;font-size:13px}
.topbar-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px 18px;padding:8px 22px}
.topbar a{color:var(--gold-2)}
.topbar a:hover{color:#fff}

/* 头部 */
.site-header{background:rgba(255,255,255,.9);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid transparent;position:sticky;top:0;z-index:100;transition:box-shadow .3s var(--ease),border-color .3s var(--ease)}
.site-header.scrolled{border-bottom:1px solid var(--line);box-shadow:0 8px 32px rgba(22,26,24,.08)}
.header-inner{display:flex;align-items:center;gap:22px;padding:14px 22px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink)}
.brand-logo{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--gold),var(--gold-deep));color:#fff;font-size:24px;font-weight:700;display:flex;align-items:center;justify-content:center;font-family:var(--serif);box-shadow:0 6px 16px rgba(168,130,74,.35);transition:transform .35s var(--ease)}
.brand:hover .brand-logo{transform:rotate(-6deg) scale(1.04)}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:19px;font-family:var(--serif);letter-spacing:1px}
.brand-text small{color:var(--gray);font-size:12px}
.main-nav{margin-left:auto}
.nav-list{display:flex;list-style:none;gap:2px}
.nav-item{position:relative}
.nav-link{display:block;padding:10px 14px;color:var(--ink);font-weight:500;border-radius:8px;font-size:15px;position:relative}
.nav-link::after{content:"";position:absolute;left:14px;right:14px;bottom:6px;height:2px;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.nav-link:hover::after,.nav-item.active>.nav-link::after{transform:scaleX(1)}
.nav-link:hover,.nav-item.active>.nav-link{color:var(--gold-deep)}
.caret{font-size:10px;margin-left:4px;opacity:.6}
.dropdown{position:absolute;top:100%;left:0;min-width:168px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);list-style:none;padding:6px;opacity:0;visibility:hidden;transform:translateY(10px);transition:.25s var(--ease);z-index:200}
.nav-item:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:9px 13px;border-radius:8px;color:var(--ink);font-size:14px}
.dropdown a:hover{background:var(--green-light);color:var(--gold-deep);padding-left:17px}
.nav-toggle{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--dark);margin-left:auto}

/* 页面标题区 */
.page-hero{background:radial-gradient(120% 160% at 50% 0%,#2a302c 0%,var(--dark) 55%,#101311 100%);color:#fff;padding:58px 0;position:relative;overflow:hidden}
.page-hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:linear-gradient(90deg,transparent,var(--gold),transparent)}
.page-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 200px at 85% -10%,rgba(200,163,102,.28),transparent 70%);pointer-events:none}
.page-hero h1{color:#fff;font-size:34px;font-family:var(--serif);letter-spacing:1px}
.page-hero p{opacity:.82;margin-top:10px;max-width:720px;color:#e9e2d4}
.breadcrumb{font-size:13px;color:#cfc6b4;margin-bottom:12px}
.breadcrumb a{color:var(--gold-2)}
.breadcrumb a:hover{color:#fff}

/* 区块 */
.section{padding:60px 0}
.section-alt{background:var(--white)}
.section-head{max-width:780px;margin:0 auto 38px;text-align:center}
.section-head .kicker{display:inline-flex;align-items:center;gap:12px;color:var(--gold-deep);font-size:13px;letter-spacing:4px;margin-bottom:10px;text-transform:uppercase}
.section-head .kicker::before,.section-head .kicker::after{content:"";width:32px;height:1px;background:var(--gold)}
.section-head h2{font-size:30px;font-family:var(--serif);letter-spacing:1px}
.section-head p{color:var(--gray);margin-top:10px}

/* 首页 hero */
.hero{position:relative;color:#fff;background:linear-gradient(rgba(18,22,20,.78),rgba(18,22,20,.78)),url('../img/products/yashu/ya-h53/render-1.jpg') center/cover no-repeat;min-height:600px;display:flex;align-items:center;overflow:hidden;animation:heroZoom 22s ease-in-out infinite alternate}
@keyframes heroZoom{from{background-size:105% auto}to{background-size:116% auto}}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(16,20,18,.88) 0%,rgba(16,20,18,.55) 45%,rgba(16,20,18,.25) 100%);pointer-events:none}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:4px;background:linear-gradient(90deg,transparent,var(--gold),transparent)}
.hero-inner{position:relative;z-index:2;max-width:720px;padding:84px 0}
.hero .kicker{color:var(--gold-2);letter-spacing:5px;font-size:14px;text-transform:uppercase}
.hero h1{color:#fff;font-size:46px;font-family:var(--serif);margin:16px 0;letter-spacing:1px;line-height:1.3}
.hero h1 em{font-style:normal;color:var(--gold-2)}
.hero p{font-size:18px;opacity:.94;margin-bottom:8px;max-width:620px}
.hero-stats{display:flex;flex-wrap:wrap;gap:16px;margin-top:30px}
.hero-stat{background:rgba(255,255,255,.08);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.16);padding:15px 20px;border-radius:14px;transition:transform .3s var(--ease),background .3s}
.hero-stat:hover{transform:translateY(-5px);background:rgba(255,255,255,.14);border-color:rgba(200,163,102,.55)}
.hero-stat b{display:block;font-size:26px;color:var(--gold-2);font-family:var(--serif)}
.hero-stat span{font-size:13px;opacity:.88}
.btn{display:inline-block;padding:14px 30px;border-radius:40px;font-weight:600;cursor:pointer;border:none;font-size:16px;transition:all .3s var(--ease);position:relative;overflow:hidden}
.btn-primary{background:linear-gradient(135deg,var(--gold),var(--gold-deep));color:#fff;box-shadow:0 10px 26px rgba(168,130,74,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(168,130,74,.45);color:#fff}
.btn-ghost{background:transparent;border:1px solid rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14);border-color:#fff;color:#fff;transform:translateY(-2px)}
.btn-green{background:var(--dark);color:var(--gold-2);box-shadow:0 10px 24px rgba(22,26,24,.22)}
.btn-green:hover{background:linear-gradient(135deg,var(--gold),var(--gold-deep));color:#fff;transform:translateY(-2px)}

/* 卡片 */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s;position:relative}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow);border-color:rgba(200,163,102,.5)}
.card a{display:block;color:inherit}
.card-img{aspect-ratio:4/3;overflow:hidden;position:relative}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease),filter .7s}
.card:hover .card-img img{transform:scale(1.08);filter:brightness(1.03)}
.card-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(16,20,18,.45));opacity:0;transition:opacity .4s}
.card:hover .card-img::after{opacity:1}
.card-body{padding:20px}
.card-body h3{font-size:17px;margin-bottom:6px;transition:color .3s}
.card:hover .card-body h3{color:var(--gold-deep)}
.card-body p{color:var(--gray);font-size:14px}
.card-meta{font-size:12px;color:var(--gold-deep);margin-bottom:8px;letter-spacing:1.5px}

/* 优势 */
.adv-card{padding:30px;text-align:center;background:#fff}
.adv-icon{font-size:36px;margin-bottom:12px;display:inline-block;transition:transform .4s var(--ease)}
.adv-card:hover .adv-icon{transform:translateY(-6px) scale(1.1)}
.adv-card h3{font-size:18px;margin-bottom:8px}
.adv-card p{font-size:14px;color:var(--gray)}

/* 数字条 */
.stat-bar{background:radial-gradient(120% 160% at 50% 0%,#2a302c 0%,var(--dark) 60%,#101311 100%);color:#fff;padding:52px 0;position:relative;overflow:hidden}
.stat-bar::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:linear-gradient(90deg,transparent,var(--gold),transparent)}
.stat-bar .grid{text-align:center}
.stat-bar b{font-size:42px;color:var(--gold-2);display:block;font-family:var(--serif);line-height:1.1}
.stat-bar span{font-size:14px;opacity:.85}

/* 表格 */
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:14px;margin:18px 0;box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--green-light);color:var(--dark);font-weight:600;white-space:nowrap}
tbody tr{transition:background .25s}
tbody tr:hover{background:#faf6ec}
tr:last-child td{border-bottom:none}

/* 文章 */
.article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:42px;box-shadow:var(--shadow-sm)}
.article h1{font-size:28px;margin-bottom:20px;font-family:var(--serif);letter-spacing:1px}
.article h2{font-size:22px;margin:30px 0 14px;padding:8px 0 0 14px;border-left:3px solid var(--gold);border-top:none}
.article h3{font-size:18px;margin:24px 0 10px}
.article p{margin-bottom:15px;color:#3a403c}
.article ul,.article ol{margin:0 0 18px 24px;color:#3a403c}
.article li{margin-bottom:8px}
.article blockquote{border-left:4px solid var(--gold);background:linear-gradient(90deg,#f8f2e6,#fbf7ef);padding:14px 20px;border-radius:0 12px 12px 0;margin:18px 0;color:#6b5a36}
.article blockquote p{margin:0}
.article pre{background:#1b201e;color:#e6d9bf;padding:18px;border-radius:12px;overflow:auto;font-size:13px;margin:18px 0;line-height:1.6}
.article code{background:var(--green-light);color:var(--gold-deep);padding:2px 7px;border-radius:6px;font-size:.9em}
.article pre code{background:none;color:inherit;padding:0}
.article hr{border:none;border-top:1px solid var(--line);margin:24px 0}
.article img{border-radius:12px;margin:14px 0}

/* 图集 */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:18px}
.gallery figure{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .35s var(--ease),box-shadow .35s}
.gallery figure:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.gallery img{width:100%;height:230px;object-fit:cover;transition:transform .6s var(--ease)}
.gallery figure:hover img{transform:scale(1.06)}
.gallery figcaption{padding:10px 14px;font-size:13px;color:var(--gray)}

/* FAQ */
.faq-list{max-width:880px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;overflow:hidden;transition:border-color .3s,box-shadow .3s}
.faq-item[open]{border-color:rgba(200,163,102,.55);box-shadow:var(--shadow-sm)}
.faq-item summary{padding:17px 22px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;list-style:none;transition:color .3s}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--gold-deep)}
.faq-item summary::after{content:"＋";color:var(--gold-deep);font-size:20px;transition:transform .3s}
.faq-item[open] summary::after{content:"－";transform:rotate(180deg)}
.faq-item .faq-body{padding:0 22px 20px;color:var(--gray);animation:fadeIn .35s ease}
.faq-item .faq-body p{margin-bottom:10px}
@keyframes fadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* 标签 */
.tag{display:inline-block;background:var(--green-light);color:var(--gold-deep);padding:4px 12px;border-radius:20px;font-size:12px;margin:0 6px 6px 0;border:1px solid rgba(200,163,102,.25);transition:all .25s}
.tag:hover{background:var(--gold);color:#fff;transform:translateY(-2px)}

/* CTA */
.cta{background:radial-gradient(120% 180% at 50% 0%,#2a302c 0%,var(--dark) 60%,#101311 100%);color:#fff;text-align:center;padding:66px 0;position:relative;overflow:hidden}
.cta::after{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,transparent,var(--gold),transparent)}
.cta h2{color:#fff;font-size:32px;font-family:var(--serif);letter-spacing:1px}
.cta p{opacity:.86;margin:12px 0 28px;color:#e9e2d4}
.cta .btn{margin:0 4px}

/* 页脚 */
.site-footer{background:#0f1211;color:#c8d0ca;margin-top:70px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:34px;padding:52px 22px 40px}
.footer-col h3{color:#fff;font-size:16px;margin-bottom:16px;letter-spacing:1px;position:relative;padding-bottom:10px}
.footer-col h3::after{content:"";position:absolute;left:0;bottom:0;width:28px;height:2px;background:var(--gold)}
.footer-col p,.footer-col li{font-size:14px;line-height:2;color:#b3bdb5}
.footer-col ul{list-style:none}
.footer-col a{color:#b3bdb5;transition:color .25s,padding-left .25s}
.footer-col a:hover{color:var(--gold-2);padding-left:4px}
.footer-slogan{color:var(--gold-2)!important;margin-top:12px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.07);padding:18px 0}
.footer-bottom .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:12px;color:#7d877f}
.footer-bottom a{color:#7d877f}
.footer-bottom a:hover{color:var(--gold-2)}

/* 回到顶部 + 进度 */
.back-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--gold),var(--gold-deep));color:#fff;display:none;align-items:center;justify-content:center;font-size:20px;box-shadow:0 10px 26px rgba(168,130,74,.4);z-index:900;transition:transform .3s}
.back-top.show{display:flex}
.back-top:hover{transform:translateY(-4px)}

/* 面包屑 */
.crumb-page{padding:26px 0 0}
.crumb-page .breadcrumb{color:var(--gray);font-size:13px;margin-bottom:6px}
.crumb-page .breadcrumb a{color:var(--gold-deep)}
.crumb-page .breadcrumb span{color:var(--gray)}

/* 滚动渐显 */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in-view{opacity:1;transform:none}

/* 响应式 */
@media(max-width:960px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:760px){
  .nav-toggle{display:block}
  .main-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-top:1px solid var(--line);box-shadow:var(--shadow);display:none;max-height:calc(100vh - 70px);overflow:auto}
  .main-nav.open{display:block}
  .nav-list{flex-direction:column;padding:12px}
  .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;display:none;padding-left:16px}
  .nav-item.open .dropdown{display:block}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .hero{min-height:auto;animation:none}
  .hero h1{font-size:32px}
  .hero-inner{padding:60px 0}
  .article{padding:24px}
  .section{padding:44px 0}
  .topbar-inner{justify-content:center}
  .footer-grid{grid-template-columns:1fr}
  .page-hero{padding:44px 0}
  .page-hero h1{font-size:28px}
}