/* ============ 一体家美学木作 全站样式 ============ */
:root {
  --gold: #c2aa85;
  --gold-dark: #a8895f;
  --dark: #1c1712;
  --dark-2: #262019;
  --ink: #2e2a24;
  --muted: #8a8276;
  --bg: #f7f3ec;
  --bg-2: #efe9de;
  --line: #e6ddcd;
  --white: #fff;
  --radius: 4px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --serif: Georgia, "Songti SC", "SimSun", serif;
  --shadow: 0 8px 30px rgba(28, 23, 18, .12);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  font-size: 15px;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section.bg { background: var(--bg); }
.sec-head { text-align: center; margin-bottom: 48px; }
.sec-head .en { font-family: var(--serif); letter-spacing: 4px; text-transform: uppercase; color: var(--gold); font-size: 13px; margin-bottom: 6px; }
.sec-head h2 { font-size: 30px; font-weight: 600; letter-spacing: 6px; color: var(--dark); }
.sec-head .sub { color: var(--muted); margin-top: 10px; font-size: 14px; letter-spacing: 2px; }
.sec-head h2::after { content: ""; display: block; width: 44px; height: 2px; background: var(--gold); margin: 14px auto 0; }
.btn-gold {
  display: inline-block; background: var(--gold); color: #fff; padding: 12px 38px;
  letter-spacing: 3px; font-size: 14px; transition: background .25s;
}
.btn-gold:hover { background: var(--gold-dark); }
.btn-outline {
  display: inline-block; border: 1px solid var(--gold); color: var(--gold);
  padding: 11px 38px; letter-spacing: 3px; font-size: 14px; transition: all .25s;
}
.btn-outline:hover { background: var(--gold); color: #fff; }
.ghost { display: inline-block; border: 1px solid rgba(255,255,255,.7); color: #fff; padding: 11px 38px; letter-spacing: 3px; font-size: 14px; transition: all .25s; }
.ghost:hover { background: #fff; color: var(--dark); }
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .6s ease, transform .6s ease; }
.reveal.on { opacity: 1; transform: none; }

/* ============ 顶栏 ============ */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s, box-shadow .3s;
}
.header .bar { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.header .logo { height: 44px; display: flex; align-items: center; }
.header .logo img { height: 100%; width: auto; }
.header .logo img.logo-dark { display: none; }
.nav { display: flex; align-items: center; }
.nav > li { position: relative; }
.nav > li > a {
  display: block; padding: 24px 20px; font-size: 15px; letter-spacing: 2px; color: #fff;
  transition: color .2s;
}
.nav > li > a.active, .nav > li > a:hover { color: var(--gold); }
.nav .has-sub > a::after { content: ""; display: inline-block; margin-left: 6px; width: 6px; height: 6px; border-right: 1px solid currentColor; border-bottom: 1px solid currentColor; transform: rotate(45deg) translateY(-2px); }
.nav .submenu {
  position: absolute; top: 100%; left: 0; min-width: 148px; background: var(--white);
  box-shadow: var(--shadow); padding: 8px 0; opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: all .25s; border-top: 2px solid var(--gold);
}
.nav li:hover .submenu { opacity: 1; visibility: visible; transform: none; }
.nav .submenu a { display: block; padding: 10px 22px; font-size: 14px; color: var(--ink); letter-spacing: 1px; }
.nav .submenu a:hover { color: var(--gold); background: var(--bg); }
.header.scrolled, .header.solid {
  background: rgba(255,255,255,.97); box-shadow: 0 2px 18px rgba(28,23,18,.08);
}
.header.scrolled .nav > li > a, .header.solid .nav > li > a { color: var(--dark); }
.header.scrolled .nav > li > a.active, .header.scrolled .nav > li > a:hover, .header.solid .nav > li > a.active, .header.solid .nav > li > a:hover { color: var(--gold); }
.header.scrolled .logo img.logo-white, .header.solid .logo img.logo-white { display: none; }
.header.scrolled .logo img.logo-dark, .header.solid .logo img.logo-dark { display: block; }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.hamburger span { width: 24px; height: 2px; background: #fff; transition: all .3s; }
.header.scrolled .hamburger span, .header.solid .hamburger span { background: var(--dark); }
.mobile-nav {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 99;
  background: rgba(28,23,18,.97); padding: 100px 40px 40px; overflow-y: auto;
}
.mobile-nav a { display: block; color: #fff; font-size: 20px; letter-spacing: 3px; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.mobile-nav a.active { color: var(--gold); }

/* ============ 页头横幅 ============ */
.banner { position: relative; height: 340px; background: var(--dark) center/cover no-repeat; display: flex; align-items: center; justify-content: center; text-align: center; }
.banner::after { content: ""; position: absolute; inset: 0; background: rgba(20,15,10,.55); }
.banner .inner { position: relative; z-index: 1; color: #fff; }
.banner h1 { font-size: 38px; letter-spacing: 10px; font-weight: 500; }
.banner h1 span { color: var(--gold); }
.banner .crumbs { margin-top: 14px; font-size: 13px; letter-spacing: 2px; color: rgba(255,255,255,.75); }
.banner .crumbs b { color: var(--gold); font-weight: normal; }

/* ============ 首页 ============ */
.hero { position: relative; height: 100vh; min-height: 620px; overflow: hidden; }
.hero video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero .poster { position: absolute; inset: 0; background: center/cover no-repeat; }
.hero .mask { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(15,10,6,.55) 0%, rgba(15,10,6,.35) 50%, rgba(15,10,6,.6) 100%); }
.hero .content { position: relative; z-index: 2; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #fff; text-align: center; }
.hero .content .logo-big { width: 210px; margin-bottom: 34px; }
.hero .content h1 { font-size: 52px; letter-spacing: 16px; font-weight: 500; text-shadow: 0 2px 20px rgba(0,0,0,.35); }
.hero .content h1 em { font-style: normal; color: var(--gold); }
.hero .content .slogan { margin-top: 20px; font-size: 16px; letter-spacing: 8px; color: rgba(255,255,255,.9); }
.hero .content .cta { margin-top: 44px; display: flex; gap: 20px; }
.hero .scroll-down { position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%); z-index: 2; color: #fff; font-size: 12px; letter-spacing: 3px; animation: bob 2s infinite; }
@keyframes bob { 0%,100% { transform: translate(-50%,0); } 50% { transform: translate(-50%,10px); } }

.intro { padding: 88px 0 64px; text-align: center; }
.intro .en { color: var(--gold); letter-spacing: 5px; font-size: 13px; font-family: var(--serif); }
.intro h2 { font-size: 32px; letter-spacing: 8px; color: var(--dark); margin: 10px 0 16px; font-weight: 600; }
.intro p.desc { color: var(--muted); max-width: 640px; margin: 0 auto; letter-spacing: 1px; }

.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.cards3 .card { position: relative; overflow: hidden; height: 380px; cursor: pointer; }
.cards3 .card img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.cards3 .card:hover img { transform: scale(1.06); }
.cards3 .card .cap { position: absolute; inset: auto 0 0 0; padding: 70px 24px 26px; background: linear-gradient(180deg, transparent, rgba(15,10,6,.8)); color: #fff; text-align: center; }
.cards3 .card .cap h3 { font-size: 22px; letter-spacing: 6px; font-weight: 500; }
.cards3 .card .cap .en2 { font-family: var(--serif); font-size: 12px; letter-spacing: 3px; color: var(--gold); margin-top: 6px; }
.cards3 .card .cap .more { display: inline-block; margin-top: 14px; font-size: 12px; letter-spacing: 2px; color: #fff; border-bottom: 1px solid var(--gold); padding-bottom: 3px; opacity: 0; transform: translateY(8px); transition: all .3s; }
.cards3 .card:hover .cap .more { opacity: 1; transform: none; }

.features { background: var(--dark); color: #fff; }
.features .sec-head h2 { color: #fff; }
.features .sec-head .sub { color: rgba(255,255,255,.55); }
.feats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feat { text-align: center; padding: 34px 22px; background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); transition: border-color .3s, background .3s; }
.feat:hover { border-color: var(--gold); background: rgba(194,170,133,.06); }
.feat img { width: 56px; height: 56px; object-fit: contain; margin: 0 auto 18px; }
.feat h3 { font-size: 18px; letter-spacing: 4px; font-weight: 500; margin-bottom: 10px; color: var(--gold); }
.feat p { font-size: 13px; color: rgba(255,255,255,.62); line-height: 1.9; text-align: left; }

.grid-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-cards .card { position: relative; overflow: hidden; height: 220px; }
.grid-cards .card img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.grid-cards .card:hover img { transform: scale(1.06); }
.grid-cards .card .cap { position: absolute; inset: 0; background: rgba(15,10,6,.45); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 20px; letter-spacing: 6px; transition: background .3s; }
.grid-cards .card:hover .cap { background: rgba(15,10,6,.68); }

.case-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.case-grid .item { position: relative; overflow: hidden; cursor: pointer; aspect-ratio: 3/4; background: var(--bg-2); }
.case-grid .item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.case-grid .item:hover img { transform: scale(1.07); }
.case-grid .item .t { position: absolute; left: 0; right: 0; bottom: 0; padding: 34px 14px 12px; background: linear-gradient(180deg, transparent, rgba(15,10,6,.78)); color: #fff; font-size: 13px; letter-spacing: 1px; }

.video-preview { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.video-preview .v { position: relative; overflow: hidden; cursor: pointer; aspect-ratio: 16/9; background: linear-gradient(135deg, #2a221a 0%, #1c1712 55%, #2f2620 100%); opacity:1 }
.video-preview .v img { width: 100%; height: 100%; object-fit: cover; opacity: .75; transition: all .5s; }
.video-preview .v:hover img { opacity: .5; transform: scale(1.05); }
.video-preview .v .play { position: absolute; inset: 0; margin: auto; width: 56px; height: 56px; border: 1px solid rgba(255,255,255,.8); border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: background .3s; }
.video-preview .v .play::after { content: ""; width: 0; height: 0; border-left: 16px solid #fff; border-top: 10px solid transparent; border-bottom: 10px solid transparent; margin-left: 4px; }
.video-preview .v:hover .play { background: var(--gold); border-color: var(--gold); }
.video-preview .v .name { position: absolute; left: 0; right: 0; bottom: 0; padding: 30px 16px 12px; background: linear-gradient(180deg, transparent, rgba(0,0,0,.75)); color: #fff; font-size: 14px; letter-spacing: 2px; }

.flow { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; text-align: center; }
.flow .step img { width: 60px; height: 60px; object-fit: contain; margin: 0 auto 12px; }
.flow .step h4 { font-size: 15px; letter-spacing: 3px; color: var(--dark); margin-bottom: 6px; }
.flow .step .no { font-family: var(--serif); color: var(--gold); font-size: 13px; letter-spacing: 2px; }
.flow .step { position: relative; }
.flow .step:not(:last-child)::after { content: "·"; position: absolute; right: -13px; top: 22px; color: var(--gold); font-size: 22px; }

.join-cta { position: relative; background: var(--dark) center/cover no-repeat; padding: 90px 0; text-align: center; color: #fff; }
.join-cta::after { content: ""; position: absolute; inset: 0; background: rgba(20,15,10,.62); }
.join-cta .inner { position: relative; z-index: 1; }
.join-cta h2 { font-size: 32px; letter-spacing: 8px; font-weight: 500; }
.join-cta p { margin: 16px auto 36px; color: rgba(255,255,255,.72); letter-spacing: 2px; font-size: 14px; }

/* ============ 页脚 ============ */
.footer { background: var(--dark); color: rgba(255,255,255,.72); }
.footer .top { display: grid; grid-template-columns: 1.4fr 1fr 1.2fr 1fr; gap: 40px; padding: 64px 0 48px; }
.footer h4 { color: #fff; font-size: 16px; letter-spacing: 3px; margin-bottom: 22px; font-weight: 500; }
.footer h4::before { content: ""; display: inline-block; width: 18px; height: 2px; background: var(--gold); vertical-align: middle; margin-right: 10px; }
.footer .brand img { height: 40px; margin-bottom: 18px; }
.footer .brand p { font-size: 13px; line-height: 2; color: rgba(255,255,255,.55); }
.footer .links a { display: block; padding: 6px 0; font-size: 14px; color: rgba(255,255,255,.65); transition: color .2s, padding-left .2s; }
.footer .links a:hover { color: var(--gold); padding-left: 8px; }
.footer .contact li { display: flex; margin-bottom: 14px; font-size: 13px; line-height: 1.8; }
.footer .contact li .k { color: var(--gold); min-width: 44px; }
.footer .contact a:hover { color: var(--gold); }
.footer .qrs { display: flex; gap: 18px; }
.footer .qr { text-align: center; }
.footer .qr img { width: 104px; height: 104px; object-fit: cover; margin-bottom: 8px; }
.footer .qr .qr-ph { width: 104px; height: 104px; margin-bottom: 8px; background: var(--bg-2); border: 1px dashed var(--gold); display: flex; align-items: center; justify-content: center; text-align: center; font-size: 12px; line-height: 1.7; color: var(--muted); letter-spacing: 1px; }
.footer .qr span { font-size: 12px; color: rgba(255,255,255,.55); letter-spacing: 1px; }
.footer .bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 20px 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: 12px; color: rgba(255,255,255,.4); }
.footer .bottom a { color: rgba(255,255,255,.4); }
.footer .bottom a:hover { color: var(--gold); }

/* ============ 列表页（产品/案例/视频） ============ */
.page-body { padding: 100px 0 70px; }
.tabs { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; }
.tabs .tab { padding: 8px 22px; border: 1px solid var(--line); font-size: 14px; letter-spacing: 2px; color: var(--muted); cursor: pointer; transition: all .2s; background: #fff; }
.tabs .tab:hover { border-color: var(--gold); color: var(--gold); }
.tabs .tab.active { background: var(--dark); border-color: var(--dark); color: #fff; }
.tabs.tabs-l3 { margin-bottom: 0; }
.tabs.tabs-l3 .tab { padding: 6px 16px; font-size: 13px; }
.tabs.tabs-l3 .tab.active { background: var(--gold); border-color: var(--gold); }
.tabs-bar { position: sticky; top: 72px; z-index: 50; background: rgba(247,243,236,.96); backdrop-filter: blur(6px); padding: 16px 0 8px; margin: 16px 0 26px; border-bottom: 1px solid var(--line); }
.picker-row { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.picker-row .tabs { margin-bottom: 0; }
.picker-row .sel { position: relative; display: flex; align-items: center; border: 1px solid var(--line); background: #fff; padding: 10px 20px; font-size: 15px; letter-spacing: 2px; cursor: pointer; min-width: 160px; justify-content: space-between; }
.picker-row .sel::after { content: ""; width: 7px; height: 7px; border-right: 1.5px solid var(--muted); border-bottom: 1.5px solid var(--muted); transform: rotate(45deg); margin-left: 12px; }
.filter-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 0px; }
.filter-bar .chip { display: inline-flex; align-items: center; gap: 6px; background: var(--dark); color: #fff; padding: 5px 14px; font-size: 13px; letter-spacing: 1px; }
.filter-bar .chip i { cursor: pointer; font-style: normal; color: var(--gold); }
.filter-bar .clear { font-size: 13px; color: var(--muted); cursor: pointer; border-bottom: 1px solid var(--muted); }
.filter-btn { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--gold); color: var(--gold); padding: 8px 20px; font-size: 14px; letter-spacing: 2px; cursor: pointer; background: #fff; }
.filter-btn .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--gold); }
.filter-panel { position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 200; display: none; align-items: flex-end; }
.filter-panel.show { display: flex; }
.filter-panel .overlay { position: absolute; inset: 0; background: rgba(15,10,6,.5); }
.filter-panel .panel { position: relative; width: 100%; max-width: 900px; margin: 0 auto; background: #fff; box-shadow: 0 -10px 40px rgba(0,0,0,.2); max-height: 76vh; overflow-y: auto; }
.filter-panel .panel-head { display: flex; align-items: center; justify-content: space-between; padding: 18px 28px; border-bottom: 1px solid var(--line); }
.filter-panel .panel-head .t { font-size: 16px; letter-spacing: 3px; color: var(--dark); }
.filter-panel .panel-head .close { cursor: pointer; font-size: 26px; color: var(--muted); line-height: 1; }
.filter-groups { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
.filter-group { padding: 22px 18px; border-right: 1px solid var(--line); }
.filter-group:last-child { border-right: none; }
.filter-group .g-name { font-size: 14px; color: var(--gold); letter-spacing: 2px; margin-bottom: 14px; }
.filter-group .g-desc { font-size: 11px; color: var(--muted); margin-bottom: 10px; }
.filter-group .g-sub { font-size: 12px; color: var(--muted); margin: 10px 0 6px; }
.filter-group .tags { display: flex; flex-wrap: wrap; gap: 6px; }
.filter-group .tag { border: 1px solid var(--line); padding: 3px 10px; font-size: 12px; cursor: pointer; transition: all .2s; background: #fff; }
.filter-group .tag:hover { border-color: var(--gold); color: var(--gold); }
.filter-group .tag.on { background: var(--gold); border-color: var(--gold); color: #fff; }
.grid-articles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-articles .article-card { min-width: 0; }
.grid-articles.cols-4 { grid-template-columns: repeat(4, 1fr); }
.article-card { position: relative; overflow: hidden; cursor: pointer; background: var(--bg); }
.article-card .img { aspect-ratio: 4/5; overflow: hidden; }
.article-card .img img { width: 100%; height: 200%; object-fit: cover; transition: transform .5s; }
#grid.c-gallery .article-card .img { aspect-ratio: 1/1; }
#grid.c-gallery .article-card .img img { height: 100%; }
#grid.c-za .article-card .img { aspect-ratio: 2/1; }
#grid.c-za .article-card .img img { height: 100%; }
#grid.c-video .article-card .img { aspect-ratio: 3/4.4; overflow: hidden; }
#grid.c-video .article-card .img img { height: 100%; }
.article-card:hover .img img { transform: scale(1.06); }
.article-card .t { padding: 12px 4px 2px; font-size: 14px; color: var(--dark); letter-spacing: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.article-card .meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); padding: 0 4px 6px; }
.article-card .play-badge { position: absolute; top: 10px; left: 10px; background: rgba(28,23,18,.72); color: #fff; font-size: 11px; padding: 3px 8px; letter-spacing: 1px; border-radius: 2px; }
.load-more { text-align: center; margin-top: 56px; }
.loading-tip { text-align: center; color: var(--muted); padding: 20px 0 10px; font-size: 13px; letter-spacing: 2px; }
.sentinel { height: 1px; }

/* ============ 详情页 ============ */
.detail { max-width: 900px; margin: 0 auto; }
.crumb { padding: 20px 0 0; font-size: 13px; color: var(--muted); letter-spacing: 1px; }
.crumb a:hover { color: var(--gold); }
.crumb b { color: var(--gold); font-weight: normal; }
.detail h1 { font-size: 28px; letter-spacing: 3px; color: var(--dark); margin: 14px 0 10px; font-weight: 600; }
.detail .meta { display: flex; gap: 22px; color: var(--muted); font-size: 13px; padding-bottom: 20px; border-bottom: 1px solid var(--line); margin-bottom: 28px; }
.gallery { display: grid; grid-template-columns: 90px 1fr; gap: 14px; margin-bottom: 32px; }
.gallery .thumbs { display: flex; flex-direction: column; gap: 8px; max-height: 480px; overflow-y: auto; }
.gallery .thumbs img { width: 90px; height: 90px; object-fit: cover; cursor: pointer; opacity: .55; border: 2px solid transparent; transition: all .2s; }
.gallery .thumbs img.on { opacity: 1; border-color: var(--gold); }
.gallery .main { position: relative; background: #FBFBFD; }
.gallery .main img { width: 100%; height:about; object-fit: contain;  }
.gallery .main .count { position: absolute; right: 12px; bottom: 10px; background: rgba(15,10,6,.6); color: #fff; font-size: 12px; padding: 3px 10px; letter-spacing: 1px; }
.detail .content { line-height: 2; color: var(--ink); font-size: 15px; }
.detail .content img { max-width: 100%; margin: 14px auto; }
.detail .content p { margin-bottom: 12px; }
.detail .video-note { background: var(--bg); border: 1px solid var(--line); padding: 18px 24px; margin-top: 30px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.detail .video-note p { font-size: 14px; color: var(--ink); }
.detail .video-note p small { display: block; color: var(--muted); font-size: 12px; margin-top: 4px; }
.detail .video-note .btn-gold { padding: 9px 24px; font-size: 13px; }

/* ============ 视频弹窗 ============ */
.vmodal { position: fixed; inset: 0; z-index: 300; display: none; align-items: center; justify-content: center; background: rgba(10,8,5,.88); padding: 20px; }
.vmodal.show { display: flex; }
.vmodal .box { position: relative; width: 100%; max-width: 960px; background: #000; }
.vmodal video { width: 100%; max-height: 82vh; display: block; }
.vmodal .close { position: absolute; top: -44px; right: 0; color: #fff; font-size: 30px; cursor: pointer; line-height: 1; }
.vmodal .name { position: absolute; left: 0; bottom: -36px; color: rgba(255,255,255,.8); font-size: 14px; letter-spacing: 1px; }

/* ============ 关于/招商/联系 ============ */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-grid .txt h2 { font-size: 26px; letter-spacing: 5px; color: var(--dark); margin-bottom: 18px; }
.about-grid .txt h2::before { content: ""; display: inline-block; width: 26px; height: 2px; background: var(--gold); vertical-align: middle; margin-right: 12px; }
.about-grid .txt p { color: var(--muted); margin-bottom: 14px; font-size: 14px; line-height: 2.1; text-align: justify; }
.about-grid .img { position: relative; }
.about-grid .img img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.values { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.value { text-align: center; padding: 30px 18px; background: #fff; border: 1px solid var(--line); transition: all .3s; }
.value:hover { border-color: var(--gold); transform: translateY(-4px); box-shadow: var(--shadow); }
.value h3 { color: var(--gold); font-size: 17px; letter-spacing: 3px; margin-bottom: 10px; font-weight: 500; }
.value p { font-size: 13px; color: var(--muted); line-height: 1.9; }

.join-adv { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.join-adv .adv { background: #fff; border: 1px solid var(--line); overflow: hidden; transition: all .3s; }
.join-adv .adv:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.join-adv .adv img { width: 100%; height: 220px; object-fit: cover; }
.join-adv .adv .b { padding: 24px 26px 30px; }
.join-adv .adv h3 { font-size: 18px; letter-spacing: 3px; color: var(--dark); margin-bottom: 12px; }
.join-adv .adv h3 span { color: var(--gold); margin-right: 8px; font-family: var(--serif); }
.join-adv .adv p { font-size: 13px; color: var(--muted); line-height: 2; text-align: justify; }

.join-form { max-width: 720px; margin: 0 auto; background: #fff; border: 1px solid var(--line); padding: 44px 48px; box-shadow: var(--shadow); }
.join-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.join-form label { display: block; font-size: 13px; color: var(--muted); letter-spacing: 1px; margin-bottom: 8px; }
.join-form label b { color: var(--gold); }
.join-form input, .join-form textarea { width: 100%; border: 1px solid var(--line); background: var(--bg); padding: 12px 16px; font-size: 14px; font-family: inherit; outline: none; transition: border-color .2s; }
.join-form input:focus, .join-form textarea:focus { border-color: var(--gold); }
.join-form .full { grid-column: 1 / -1; }
.join-form .submit { margin-top: 8px; }

.contact-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.contact-card { text-align: center; background: #fff; border: 1px solid var(--line); padding: 38px 24px; transition: all .3s; }
.contact-card:hover { border-color: var(--gold); box-shadow: var(--shadow); }
.contact-card .ic { width: 54px; height: 54px; margin: 0 auto 16px; border: 1px solid var(--gold); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--gold); font-size: 22px; }
.contact-card h3 { font-size: 16px; letter-spacing: 3px; color: var(--dark); margin-bottom: 8px; font-weight: 500; }
.contact-card p { font-size: 14px; color: var(--muted); line-height: 1.9; }
.contact-card a { color: var(--gold); }

/* ============ AI 智能客服 ============ */
.ai-widget { position: fixed; right: 24px; bottom: 24px; z-index: 999; }
.ai-btn { display: flex; align-items: center; gap: 8px; background: linear-gradient(135deg, #c2aa85, #a88c5f); border: none; border-radius: 40px; padding: 13px 20px; color: #fff; font-size: 14px; letter-spacing: 2px; cursor: pointer; box-shadow: 0 8px 24px rgba(162, 133, 85, .45); transition: all .3s; }
.ai-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(162, 133, 85, .55); }
.ai-panel { position: absolute; right: 0; bottom: 68px; width: 360px; max-width: calc(100vw - 32px); height: 560px; max-height: calc(100vh - 140px); background: #fdfbf7; border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 20px 60px rgba(40, 30, 20, .28); display: none; flex-direction: column; overflow: hidden; }
.ai-widget.open .ai-panel { display: flex; }
.ai-widget.open .ai-btn { display: none; }
.ai-head { background: linear-gradient(135deg, #2a221a, #3c3124); color: #fff; padding: 16px 18px; display: flex; align-items: center; justify-content: space-between; }
.ai-head-t b { display: block; font-size: 15px; letter-spacing: 3px; font-weight: 500; }
.ai-head-t small { color: rgba(255, 255, 255, .55); font-size: 12px; letter-spacing: 1px; }
.ai-close { background: none; border: none; color: rgba(255, 255, 255, .7); font-size: 24px; cursor: pointer; line-height: 1; padding: 0 4px; }
.ai-close:hover { color: #fff; }
.ai-msgs { flex: 1; overflow-y: auto; padding: 18px 16px; display: flex; flex-direction: column; gap: 12px; }
.ai-m { display: flex; }
.ai-m .b { max-width: 82%; background: #fff; border: 1px solid var(--line); border-radius: 2px 12px 12px 12px; padding: 10px 14px; font-size: 13px; line-height: 1.8; color: #4a4238; }
.ai-m .b a { color: var(--gold); border-bottom: 1px solid var(--gold); }
.ai-m .b b { color: var(--dark); }
.ai-m.self { justify-content: flex-end; }
.ai-m.self .b { background: linear-gradient(135deg, #2a221a, #3c3124); color: #fff; border-radius: 12px 2px 12px 12px; }
.ai-m .dot { width: 6px; height: 6px; border-radius: 50%; background: #c8bda9; display: inline-block; margin-right: 4px; animation: aiBlink 1s infinite; }
.ai-m .dot:nth-child(2) { animation-delay: .2s; }
.ai-m .dot:nth-child(3) { animation-delay: .4s; }
@keyframes aiBlink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }
.ai-links { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); display: flex; flex-wrap: wrap; gap: 6px 12px; }
.ai-links a { font-size: 12px; }
.ai-quick { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 16px 12px; }
.ai-chip { border: 1px solid var(--gold); color: var(--gold); font-size: 12px; letter-spacing: 1px; padding: 5px 12px; border-radius: 20px; cursor: pointer; transition: all .25s; }
.ai-chip:hover { background: var(--gold); color: #fff; }
.ai-input { display: flex; gap: 10px; padding: 12px 16px 16px; border-top: 1px solid var(--line); background: #fff; }
.ai-input input { flex: 1; border: 1px solid var(--line); border-radius: 4px; padding: 10px 12px; font-size: 13px; color: var(--dark); outline: none; background: #faf7f1; }
.ai-input input:focus { border-color: var(--gold); }
.ai-send { background: linear-gradient(135deg, #c2aa85, #a88c5f); border: none; border-radius: 4px; color: #fff; font-size: 13px; letter-spacing: 2px; padding: 0 18px; cursor: pointer; }
.ai-send:hover { opacity: .9; }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .cards3 { grid-template-columns: 1fr; }
  .cards3 .card { height: 300px; }
  .feats { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(3, 1fr); gap: 30px 18px; }
  .flow .step:nth-child(3)::after { display: none; }
  .footer .top { grid-template-columns: 1fr 1fr; }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-articles, .grid-articles.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .values { grid-template-columns: repeat(2, 1fr); }
  .join-adv { grid-template-columns: 1fr; }
  .filter-groups { grid-template-columns: repeat(2, 1fr); }
  .filter-group:nth-child(2n) { border-right: none; }
  .contact-cards { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav { display: none; }
  .hamburger { display: flex; }
  .hero .content h1 { font-size: 32px; letter-spacing: 8px; }
  .hero .content .slogan { letter-spacing: 4px; font-size: 14px; }
  .section { padding: 52px 0; }
  .banner { height: 260px; }
  .banner h1 { font-size: 26px; letter-spacing: 6px; }
  .feats { grid-template-columns: 1fr; }
  .grid-cards { grid-template-columns: 1fr; }
  .video-preview { grid-template-columns: 1fr; }
  .grid-articles, .grid-articles.cols-4 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .footer .top { grid-template-columns: 1fr; }
  .join-form { padding: 28px 20px; }
  .join-form .row { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .gallery .thumbs { flex-direction: row; max-height: none; overflow-x: auto; }
  .tabs-bar { top: 60px; }
}