/* ============================================================
   涌明科技 YONGMING TECH — 复刻站样式表
   风格：浅色企业风 / 稳重克制 / 现代排版（内容 1:1，布局优化）
   ============================================================ */
:root{
  --brand:#0b57c2;      /* 企业主蓝 */
  --brand-2:#0a86d4;    /* 亮蓝 */
  --brand-d:#084294;
  --ink:#1a2637;        /* 正文深墨 */
  --body:#43506a;       /* 次级文字 */
  --muted:#6b7789;      /* 弱化文字 */
  --line:#e5eaf1;       /* 分隔线 */
  --line-2:#d6deea;
  --bg:#ffffff;
  --bg-soft:#f5f8fc;    /* 浅灰蓝带 */
  --bg-alt:#eef3fa;
  --radius:14px;
  --radius-lg:20px;
  --nav-h:70px;
  --shadow-sm:0 2px 10px -2px rgba(16,40,80,.10);
  --shadow:0 16px 40px -16px rgba(16,40,80,.24);
  --shadow-lg:0 28px 60px -24px rgba(16,40,80,.30);
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-num:"DIN Alternate","Bahnschrift","Segoe UI",var(--font);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);font-family:var(--font);
  line-height:1.75;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none;transition:color .25s}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
::selection{background:rgba(11,87,194,.18)}
.wrap{width:min(1200px,92%);margin:0 auto}

/* ---------- 通用标题 ---------- */
.sec-head{text-align:center;max-width:760px;margin:0 auto 46px}
.sec-head.left{text-align:left;margin-left:0}
.sec-tag{
  display:inline-block;font-size:12.5px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--brand);font-weight:700;margin-bottom:12px;
}
.sec-title{font-size:clamp(24px,3vw,34px);font-weight:800;line-height:1.3;color:var(--ink);letter-spacing:.01em}
.sec-desc{margin-top:12px;color:var(--muted);font-size:15.5px}

section{padding:74px 0;position:relative}
section.alt{background:var(--bg-soft)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;padding:12px 28px;border-radius:10px;
  font-size:15px;font-weight:600;letter-spacing:.03em;white-space:nowrap;
  transition:transform .3s var(--ease),box-shadow .3s,background .3s,color .3s,border-color .3s;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 22px -8px rgba(11,87,194,.55)}
.btn-primary:hover{background:var(--brand-d);transform:translateY(-2px);box-shadow:0 14px 30px -8px rgba(11,87,194,.6)}
.btn-ghost{border:1px solid var(--line-2);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--brand-d);color:#cfe0f6;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:38px;gap:16px}
.topbar a{color:#fff}
.tt-right{display:flex;align-items:center;gap:18px}
@media(max-width:720px){.topbar .wrap>div:first-child{display:none}}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);transition:box-shadow .35s;
}
.nav.scrolled{box-shadow:var(--shadow-sm)}
.nav-inner{height:var(--nav-h);display:flex;align-items:center;gap:20px}
.logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.logo-mark{
  width:40px;height:40px;display:grid;place-items:center;flex-shrink:0;
}
.logo-mark img{width:100%;height:100%;object-fit:contain;display:block}
.logo-name{font-size:18px;font-weight:800;letter-spacing:.02em;line-height:1.1;color:var(--ink)}
.logo-name small{display:block;font-size:9.5px;font-weight:600;letter-spacing:.24em;color:var(--muted)}
.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-links>li{position:relative}
.nav-links a{
  display:block;padding:8px 10px;border-radius:8px;font-size:14px;
  color:var(--body);font-weight:500;transition:color .25s,background .25s;
}
.nav-links a:hover{color:var(--brand);background:var(--bg-alt)}
.nav-links a.active{color:var(--brand);font-weight:600}
.caret{display:inline-block;width:0;height:0;margin-left:6px;border:4px solid transparent;border-top-color:currentColor;vertical-align:middle;opacity:.6}
.has-drop .dropdown{
  position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%) translateY(8px);
  background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);
  padding:8px;min-width:200px;opacity:0;visibility:hidden;transition:.25s var(--ease);z-index:120;
}
.has-drop:hover .dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.has-drop .dropdown a{padding:9px 14px;font-size:14px;white-space:nowrap}
.nav-tel{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-weight:700;font-size:15px;white-space:nowrap;flex-shrink:0}
.nav-tel svg{width:18px;height:18px}
@media(max-width:1080px){.nav-tel{display:none}}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;margin-left:auto}
.nav-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ---------- 页头 Hero（内页） ---------- */
.page-hero{
  padding:84px 0 64px;color:#fff;position:relative;overflow:hidden;
  background:linear-gradient(120deg,var(--brand-d) 0%,var(--brand) 55%,var(--brand-2) 100%);
}
.page-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background:
    radial-gradient(circle at 88% 20%,rgba(255,255,255,.18),transparent 40%),
    radial-gradient(circle at 12% 90%,rgba(255,255,255,.10),transparent 42%);
}
.page-hero .wrap{position:relative;z-index:1}
.page-hero h1{font-size:clamp(28px,4.4vw,44px);font-weight:800;letter-spacing:.01em;line-height:1.25}
.ph-sub{margin-top:16px;max-width:860px;color:rgba(255,255,255,.88);font-size:15.5px;line-height:1.8}
.crumb{margin-bottom:20px;font-size:13.5px;color:rgba(255,255,255,.82)}
.crumb a:hover{color:#fff;text-decoration:underline}
.crumb i{font-style:normal;margin:0 8px;opacity:.6}
.crumb span{color:#fff;opacity:.95}

/* ---------- 首页 Hero ---------- */
.home-hero{padding:104px 0 92px;background:linear-gradient(180deg,var(--bg-soft),#fff)}
.home-hero .wrap{display:grid;grid-template-columns:1fr;max-width:900px;justify-items:center;text-align:center}
.hh-badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--brand);font-weight:600;margin-bottom:20px;
  padding:7px 16px;border-radius:999px;background:#eaf2fe;border:1px solid #cfe0f8}
.hh-badge i{font-style:normal;font-size:10px}
.home-hero h1{font-size:clamp(32px,5vw,54px);font-weight:800;line-height:1.2;color:var(--ink);letter-spacing:.01em}
.home-hero h1 .hl{color:var(--brand)}
.hh-txt{text-align:center}
.hh-sub{margin:20px auto 0;color:var(--body);font-size:clamp(15px,1.4vw,17px);max-width:640px}
.hh-ctas{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap;justify-content:center}
.hero-mini{display:flex;gap:30px;margin-top:44px;flex-wrap:wrap;justify-content:center}
.hero-mini .hm{padding-left:16px;border-left:2px solid var(--brand);text-align:left}
.hero-mini .hm .n{font-family:var(--font-num);font-size:26px;font-weight:800;color:var(--ink)}
.hero-mini .hm .l{font-size:13px;color:var(--muted)}
.hh-fig{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);border:1px solid var(--line);background:#fff}
.hh-fig img{width:100%;height:100%;object-fit:cover}
@media(max-width:960px){.home-hero .wrap{grid-template-columns:1fr;gap:36px}.hh-fig{order:-1}}

/* ---------- 首页轮播图（原站 pgwSlider → 原生淡入淡出） ---------- */
.carousel{padding:0;position:relative;width:100%;overflow:hidden;background:#0a1424;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.car-track{position:relative;width:100%;aspect-ratio:var(--car-ar,21/8)}
.car-slide{position:absolute;inset:0;display:block;opacity:0;transition:opacity .9s var(--ease);z-index:0}
.car-slide.active{opacity:1;z-index:1}
.car-slide img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .6s var(--ease)}
a.car-slide{cursor:pointer}
a.car-slide:hover img{transform:scale(1.025)}
.car-btn{position:absolute;top:50%;transform:translateY(-50%);z-index:3;width:46px;height:46px;border:none;border-radius:50%;
  background:rgba(255,255,255,.74);color:var(--ink);font-size:26px;line-height:1;cursor:pointer;
  display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);transition:background .25s,color .25s;backdrop-filter:blur(2px)}
.car-btn:hover{background:var(--brand);color:#fff}
.car-prev{left:20px}
.car-next{right:20px}
.car-dots{position:absolute;bottom:20px;left:0;right:0;z-index:3;display:flex;gap:10px;justify-content:center}
.dot{width:10px;height:10px;padding:0;border:none;border-radius:50%;background:rgba(255,255,255,.5);cursor:pointer;
  transition:width .3s var(--ease),background .3s}
.dot.active{width:26px;border-radius:6px;background:#fff}
.car-cap{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:36px 24px 40px;text-align:center;color:#fff;font-size:15px;
  background:linear-gradient(180deg,transparent,rgba(8,20,36,.55));pointer-events:none}
@media(max-width:720px){
  .car-btn{width:38px;height:38px;font-size:22px}
  .car-prev{left:10px}.car-next{right:10px}
  .car-dots{bottom:14px}
}
@media(prefers-reduced-motion:reduce){.car-slide,.car-slide img{transition:none}}

/* ---------- 首页企业视频 ---------- */
.video-frame{max-width:1000px;margin:0 auto;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);
  border:1px solid var(--line);background:#000;aspect-ratio:16/9}
.video-frame video{width:100%;height:100%;display:block;object-fit:contain}
.video-note{text-align:center;color:var(--muted);font-size:13px;margin-top:16px}

/* ---------- 网格 / 卡片 ---------- */
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1000px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){.g2,.g3,.g4{grid-template-columns:1fr}}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;transition:transform .4s var(--ease),box-shadow .4s,border-color .4s;
  position:relative;display:block;color:inherit;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--line-2)}
.card.plat{padding-top:34px}
.card.accent{border-left:3px solid var(--brand)}
.card .c-num{font-family:var(--font-num);font-size:15px;font-weight:800;color:var(--brand);letter-spacing:.06em;margin-bottom:12px}
.card h3{font-size:19px;font-weight:700;color:var(--ink);margin-bottom:6px;line-height:1.4}
.card .c-en{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.card p{color:var(--body);font-size:14.5px;line-height:1.75}
.card .badge{width:54px;height:54px;border-radius:12px;display:grid;place-items:center;margin-bottom:18px;
  background:var(--bg-alt);border:1px solid var(--line);overflow:hidden;font-size:24px}
.card .badge img{width:32px;height:32px;object-fit:contain}
.card .more{font-size:13.5px}
.card .more i{font-style:normal}

/* 图片卡 */
.pic-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:transform .4s var(--ease),box-shadow .4s;display:block;color:inherit;
}
.pic-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.pic-card .pic{aspect-ratio:16/10;overflow:hidden;background:var(--bg-alt)}
.pic-card .pic.contain{padding:22px;display:grid;place-items:center}
.pic-card .pic img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.pic-card .pic.contain img{object-fit:contain}
.pic-card:hover .pic img{transform:scale(1.06)}
.pic-card .pb{padding:22px 24px 26px}
.pic-card .flag{display:inline-block;font-size:11px;letter-spacing:.14em;color:var(--brand);font-weight:700;margin-bottom:10px}
.pic-card h3{font-size:18px;font-weight:700;color:var(--ink);margin-bottom:8px}
.pic-card p{font-size:14px;color:var(--body);line-height:1.7}
.pic-card .more{margin-top:14px;color:var(--brand);font-size:13.5px;font-weight:600}
.pic-card .more i{font-style:normal;transition:transform .3s}
.pic-card:hover .more i{transform:translateX(4px)}

/* ---------- 正文 ---------- */
.prose{color:var(--body);font-size:16px;line-height:1.9;max-width:840px}
.prose p{margin-bottom:18px}
.prose h3{font-size:20px;font-weight:800;color:var(--ink);margin:30px 0 14px}
.prose b{color:var(--ink);font-weight:700}

/* ---------- 列表（feat-list） ---------- */
.feat-list{display:grid;gap:14px;max-width:1000px;margin:0 auto}
.feat-list.one{grid-template-columns:1fr}
.feat-list li{
  position:relative;padding:14px 18px 14px 40px;background:#fff;border:1px solid var(--line);
  border-radius:10px;font-size:15px;color:var(--body);line-height:1.7;
}
.feat-list li::before{
  content:"";position:absolute;left:18px;top:20px;width:8px;height:8px;border-radius:2px;
  background:var(--brand);transform:rotate(45deg);
}
.feat-list li b{color:var(--ink);font-weight:700}

/* ---------- 左图右文 split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split.rev .fig{order:-1}
.split .txt h3{font-size:clamp(22px,2.6vw,30px);font-weight:800;color:var(--ink);margin-bottom:6px}
.split .txt .en{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--brand);font-weight:700;margin-bottom:16px}
.split .txt p{color:var(--body);font-size:15.5px;margin-bottom:14px;line-height:1.85}
.split .fig{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
.split .fig img{width:100%;height:100%;object-fit:cover;max-height:420px}
@media(max-width:900px){.split{grid-template-columns:1fr;gap:28px}.split.rev .fig{order:0}}

/* ---------- 图片带 ---------- */
.img-band{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.img-band img{width:100%;border-radius:12px;border:1px solid var(--line);aspect-ratio:16/10;object-fit:cover}
@media(max-width:720px){.img-band{grid-template-columns:1fr 1fr}}

/* ---------- 统计带 ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:20px;text-align:center}
.stats .stat{padding:14px}
.stat .val{font-family:var(--font-num);font-size:clamp(30px,3.2vw,46px);font-weight:800;color:var(--brand);line-height:1.1}
.stat .val .u{font-size:.5em;margin-left:2px}
.stat .lab{margin-top:10px;font-size:13.5px;color:var(--body)}
@media(max-width:820px){.stats{grid-template-columns:repeat(2,1fr)}}

/* ---------- 流程 ---------- */
.flow{display:grid;gap:18px}
.fstep{background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 22px;position:relative;text-align:center;
  transition:transform .35s var(--ease),box-shadow .35s}
.fstep:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm)}
.fstep .n{width:40px;height:40px;border-radius:50%;background:var(--brand);color:#fff;font-family:var(--font-num);
  font-weight:800;font-size:18px;display:grid;place-items:center;margin:0 auto 14px}
.fstep h4{font-size:15.5px;color:var(--ink);font-weight:600;line-height:1.6}
@media(max-width:820px){.flow{grid-template-columns:1fr 1fr!important}}
@media(max-width:560px){.flow{grid-template-columns:1fr!important}}

/* ---------- 标签行 ---------- */
.tagrow{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.tagrow .tg{padding:12px 26px;border-radius:999px;background:#fff;border:1px solid var(--line-2);
  font-size:15px;font-weight:600;color:var(--body);transition:.3s var(--ease)}
.tagrow .tg:hover{color:#fff;background:var(--brand);border-color:var(--brand);transform:translateY(-3px)}

/* ---------- logo 墙 ---------- */
.logos{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.logos .lg{background:#fff;border:1px solid var(--line);border-radius:12px;display:grid;place-items:center;padding:18px;aspect-ratio:3/2}
.logos .lg img{max-height:100%;object-fit:contain;filter:grayscale(.1)}
@media(max-width:820px){.logos{grid-template-columns:repeat(3,1fr)}}

/* ---------- CTA ---------- */
.cta{
  background:linear-gradient(120deg,var(--brand-d),var(--brand) 60%,var(--brand-2));
  border-radius:var(--radius-lg);padding:56px 40px;text-align:center;color:#fff;position:relative;overflow:hidden;
}
.cta::after{content:"";position:absolute;inset:0;opacity:.4;
  background:radial-gradient(circle at 20% 120%,rgba(255,255,255,.18),transparent 45%)}
.cta h2{font-size:clamp(22px,2.6vw,30px);font-weight:800;position:relative;z-index:1}
.cta p{margin:14px auto 26px;max-width:640px;color:rgba(255,255,255,.9);position:relative;z-index:1}
.cta .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative;z-index:1}
.cta .btn-primary{background:#fff;color:var(--brand)}
.cta .btn-primary:hover{background:#f0f5ff;color:var(--brand-d)}
.cta .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.cta .btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;color:#fff}

/* ---------- 联系卡片网格 ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.ct-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;display:flex;gap:16px;
  transition:transform .3s var(--ease),box-shadow .3s}
.ct-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm)}
.ct-card .ic{flex-shrink:0;width:46px;height:46px;border-radius:12px;background:var(--bg-alt);display:grid;place-items:center;color:var(--brand)}
.ct-card .ic svg{width:22px;height:22px}
.ct-card h4{font-size:14px;color:var(--muted);font-weight:600;margin-bottom:5px}
.ct-card .v{font-size:16px;color:var(--ink);font-weight:700;line-height:1.5}
.ct-card .v small{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:2px}
@media(max-width:820px){.contact-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.contact-grid{grid-template-columns:1fr}}

/* ---------- 表单 ---------- */
.form-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:34px 32px;box-shadow:var(--shadow-sm);
  display:grid;grid-template-columns:1fr 1fr;gap:20px}
.form-panel .field{display:flex;flex-direction:column;gap:8px}
.form-panel .field.full{grid-column:1 / -1}
.form-panel label{font-size:14px;font-weight:600;color:var(--ink)}
.form-panel .req{color:#e23b3b}
.form-panel input,.form-panel textarea{
  padding:12px 14px;border:1px solid var(--line-2);border-radius:10px;font-size:15px;font-family:inherit;
  color:var(--ink);background:var(--bg-soft);transition:border-color .25s,background .25s;
}
.form-panel input:focus,.form-panel textarea:focus{outline:none;border-color:var(--brand);background:#fff}
.form-panel textarea{min-height:120px;resize:vertical}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{cursor:pointer}
.chip input{position:absolute;opacity:0;width:0;height:0}
.chip span{display:inline-block;padding:7px 16px;border:1px solid var(--line-2);border-radius:999px;font-size:13.5px;color:var(--body);transition:.25s}
.chip input:checked+span{background:var(--brand);color:#fff;border-color:var(--brand)}
.form-msg{font-size:14px;font-weight:600}
.form-msg.ok{color:#16a34a}
.form-msg.err{color:#e23b3b}
@media(max-width:720px){.form-panel{grid-template-columns:1fr;padding:26px 20px}}

/* ---------- 页脚 ---------- */
footer{background:#12203a;color:#9fb0c8;padding:64px 0 0;margin-top:8px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px;padding-bottom:44px}
.fb-logo{display:flex;align-items:center;gap:11px;margin-bottom:16px}
.fb-logo .logo-mark{background:#fff;border-radius:10px;padding:5px;width:44px;height:44px}
.foot-brand p{font-size:14px;line-height:1.8;color:#8598b5;max-width:300px}
.foot-col h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:18px}
.foot-col ul li{margin-bottom:11px;font-size:14px}
.foot-col ul li a{color:#9fb0c8}
.foot-col ul li a:hover{color:#fff}
.foot-contact li{display:flex;gap:10px;align-items:flex-start;line-height:1.6}
.foot-contact svg{width:18px;height:18px;flex-shrink:0;margin-top:3px;color:var(--brand-2)}
.foot-bottom{border-top:1px solid #223454;padding:22px 0;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13.5px;color:#7d90ad}
.foot-bottom a{color:#9fb0c8}
.foot-bottom a:hover{color:#fff}
.icp{color:#66789a}
@media(max-width:900px){.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.foot-grid{grid-template-columns:1fr}}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:26px;bottom:28px;width:44px;height:44px;border-radius:12px;z-index:90;
  background:var(--brand);color:#fff;display:grid;place-items:center;font-size:18px;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transform:translateY(10px);transition:.3s var(--ease);cursor:pointer;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--brand-d)}

/* ---------- 入场动画（基础态永远可见，.in 仅触发一次淡入，绝不隐藏内容） ---------- */
.js .reveal{opacity:1}
.js .reveal.in{animation:revealIn .7s var(--ease) both}
@keyframes revealIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.js .reveal.in{animation:none}}

/* ---------- 移动端导航 ---------- */
@media(max-width:1080px){
  .nav-links{display:none}
  .nav-toggle{display:flex}
  .nav.mobile-open .nav-links{
    display:flex;flex-direction:column;align-items:stretch;position:absolute;top:var(--nav-h);left:0;right:0;
    background:#fff;border-bottom:1px solid var(--line);padding:12px 5%;box-shadow:var(--shadow);margin-left:0;gap:2px;
  }
  .nav.mobile-open .nav-links>li{width:100%}
  .has-drop .dropdown{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;border:none;
    padding-left:16px;display:none;min-width:0}
  .has-drop.open .dropdown{display:block}
  .nav.mobile-open .nav-links a{padding:12px 14px}
}