/* ============================================================
   HD Fence 前台样式 v3 — 斜切工业风 · 非对称 · 大字号
   跳出常规外贸模板范式：斜切角、网格纹理、错落卡片
   ============================================================ */
:root{
  --navy-950:#04101F;
  --navy-900:#0A1F38;
  --navy-800:#0E2C4D;
  --navy-600:#15477D;
  --blue-500:#2E86DE;
  --blue-200:#CFE3F7;
  --blue-100:#E9F2FC;
  --orange-500:#FF7A1A;
  --orange-600:#E8630A;
  --orange-100:#FFF0E6;
  --bg:#F4F6F9;
  --card:#fff;
  --text:#22303C;
  --muted:#64788F;
  --line:#DDE4EC;
  --radius:12px;
  --shadow:0 14px 34px rgba(4,16,31,.12);
  --font: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Microsoft YaHei",sans-serif;
  --grid-lines: linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.6;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--blue-500);text-decoration:none}
a:hover{color:var(--navy-800)}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ================= Header（细条工业顶栏） ================= */
.site-header{background:var(--navy-950);border-bottom:1px solid rgba(255,255,255,.08);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;gap:26px;height:66px}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand-mark{display:flex;filter:drop-shadow(0 0 10px rgba(255,122,26,.35))}
.brand-text{display:flex;flex-direction:column;line-height:1.12}
.brand-text strong{font-size:19px;letter-spacing:3px;color:#fff;font-weight:800}
.brand-text small{font-size:10px;color:#7E96B0;letter-spacing:2.4px;text-transform:uppercase}
.main-nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.main-nav a{position:relative;padding:10px 13px;color:#B8CCE0;font-size:14.5px;font-weight:500;letter-spacing:.2px}
.main-nav a::after{content:"";position:absolute;left:13px;right:13px;bottom:4px;height:2px;background:var(--orange-500);transform:scaleX(0);transition:.2s;transform-origin:left}
.main-nav a:hover{color:#fff}
.main-nav a:hover::after,.main-nav a.active::after{transform:scaleX(1)}
.main-nav a.active{color:#fff}
.main-nav a.nav-cta{background:var(--orange-500);color:#fff;font-weight:700;padding:9px 20px;border-radius:4px;margin-left:8px}
.main-nav a.nav-cta::after{display:none}
.main-nav a.nav-cta:hover{background:var(--orange-600)}
.lang-switch{position:relative}
.lang-btn{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);border-radius:4px;padding:7px 11px;font-size:13px;cursor:pointer;display:flex;align-items:center;gap:7px;color:#C9DAEC}
.lang-btn:hover{border-color:var(--orange-500);color:#fff}
.lang-flag{font-size:16px;line-height:1}
.lang-menu{display:none;position:absolute;right:0;top:calc(100% + 8px);background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);min-width:190px;padding:7px;z-index:120}
.lang-switch.open .lang-menu{display:block}
.lang-menu a{display:flex;align-items:center;gap:10px;padding:9px 13px;border-radius:7px;font-size:14px;color:var(--text)}
.lang-menu a:hover{background:var(--blue-100)}
.lang-menu a.on{color:var(--orange-600);font-weight:700;background:var(--orange-100)}
.footer-langs .lang-flag{margin-right:4px}

/* ================= Hero（大标题 + 斜切产品图 + 网格纹理） ================= */
.hero{position:relative;color:#fff;overflow:hidden;background:
  radial-gradient(1000px 520px at 90% -10%,rgba(46,134,222,.30),transparent 60%),
  radial-gradient(700px 420px at -10% 110%,rgba(255,122,26,.14),transparent 55%),
  linear-gradient(150deg,var(--navy-950) 0%,var(--navy-900) 45%,var(--navy-800) 100%)}
.hero::before{content:"";position:absolute;inset:0;background-image:var(--grid-lines);background-size:44px 44px;opacity:.6}
.hero::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:7px;background:linear-gradient(90deg,var(--orange-500) 0%,var(--orange-600) 40%,var(--blue-500) 100%)}
.hero-inner{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:96px 24px 104px;display:grid;grid-template-columns:1.12fr .88fr;gap:48px;align-items:center;width:100%}
.hero-copy .eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12px;font-weight:800;letter-spacing:3px;text-transform:uppercase;color:var(--orange-500);margin-bottom:20px}
.hero-copy .eyebrow::before{content:"";width:34px;height:3px;background:var(--orange-500);display:inline-block}
.hero-copy h1{font-size:clamp(38px,4.8vw,58px);line-height:1.08;font-weight:800;letter-spacing:-.5px;margin-bottom:22px}
.hero-copy h1 em{font-style:normal;color:var(--orange-500);position:relative}
.hero-copy p{font-size:17.5px;max-width:560px;margin-bottom:34px;color:#C2D5E8;line-height:1.75}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-media{position:relative;display:flex;align-items:center;justify-content:center}
.hero-media .hero-tile{position:relative;width:100%;max-width:520px;background:linear-gradient(160deg,var(--navy-600),var(--navy-900));clip-path:polygon(6% 0,100% 0,100% 88%,94% 100%,0 100%,0 12%);padding:26px 26px 38px;box-shadow:0 30px 60px rgba(0,0,0,.35)}
.hero-media .hero-tile::before{content:"";position:absolute;inset:12px;background-image:var(--grid-lines);background-size:34px 34px;opacity:.4;pointer-events:none}
.hero-media img{position:relative;width:100%;max-height:430px;object-fit:contain;filter:drop-shadow(0 22px 44px rgba(0,0,0,.4))}
.hero-media .hero-chip{position:absolute;right:-8px;top:34px;background:var(--orange-500);color:#fff;font-weight:800;font-size:13px;letter-spacing:1px;padding:10px 18px;transform:rotate(2deg);box-shadow:0 10px 26px rgba(255,122,26,.45)}
.hero-trust{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.hero-trust span{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;color:#B8CCE0;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.04);padding:6px 13px}
.hero-trust b{color:var(--orange-500)}

/* ================= 数据斜条 ================= */
.stats-bar{position:relative;background:var(--navy-950);color:#fff}
.stats-bar::before{content:"";position:absolute;left:0;top:0;width:100%;height:2px;background:linear-gradient(90deg,var(--orange-500),transparent)}
.stats-grid{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px 30px;padding:26px 0}
.stat{display:flex;align-items:baseline;gap:14px;padding:2px 0}
.stat strong{font-size:clamp(26px,2.6vw,36px);font-weight:800;color:#fff;letter-spacing:.5px}
.stat strong::after{content:"";display:inline-block;width:3px;height:26px;background:var(--orange-500);margin-left:14px;vertical-align:middle}
.stat span{font-size:12.5px;color:#8FA6BC;letter-spacing:.6px;max-width:130px;line-height:1.35}

/* ================= 通用区块 ================= */
.section{padding:80px 0}
.section-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:760px;margin:0 auto 48px}
.section-head.left{margin-left:0;text-align:left}
.section-head .eyebrow{display:inline-block;font-size:12px;font-weight:800;letter-spacing:3px;text-transform:uppercase;color:var(--orange-500);margin-bottom:12px}
.section-head h2{font-size:clamp(28px,3vw,38px);color:var(--navy-800);margin-bottom:12px;letter-spacing:-.3px;line-height:1.15}
.section-head p{color:var(--muted);font-size:15.5px;line-height:1.7}

/* ================= 分类（错落大卡） ================= */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;align-items:start}
.cat-card{position:relative;display:block;background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;color:var(--text);transition:.22s}
.cat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--orange-500);color:var(--text)}
.cat-card:nth-child(2){transform:translateY(26px);background:var(--navy-900);border-color:var(--navy-900)}
.cat-card:nth-child(2):hover{transform:translateY(20px)}
.cat-card .cat-top{position:relative;background:linear-gradient(160deg,var(--navy-800),var(--navy-950));padding:38px 26px 30px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.cat-card:nth-child(2) .cat-top{background:linear-gradient(160deg,var(--navy-600),var(--navy-800))}
.cat-top::before{content:"";position:absolute;inset:0;background-image:var(--grid-lines);background-size:36px 36px;opacity:.5}
.cat-card .cat-icon{position:relative;width:92px;height:92px;border-radius:24px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);color:var(--orange-500);display:flex;align-items:center;justify-content:center;transition:.22s}
.cat-card:hover .cat-icon{background:var(--orange-500);color:#fff;transform:rotate(-8deg) scale(1.06)}
.cat-card .cat-num{position:absolute;top:14px;right:20px;font-size:30px;font-weight:800;color:rgba(255,255,255,.22);letter-spacing:1px;line-height:1}
.cat-card .cat-body{padding:24px 26px 26px}
.cat-card:nth-child(2) .cat-body{color:#fff}
.cat-card h3{font-size:19px;color:var(--navy-800);margin-bottom:8px;letter-spacing:.2px}
.cat-card:nth-child(2) h3{color:#fff}
.cat-card .cat-desc{font-size:13.5px;color:var(--muted);margin-bottom:14px;min-height:42px;line-height:1.6}
.cat-card:nth-child(2) .cat-desc{color:#AFC3D6}
.cat-link{color:var(--orange-500);font-weight:800;font-size:14px;letter-spacing:.3px}

/* ================= 产品网格 ================= */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:28px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.product-card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;color:var(--text);display:flex;flex-direction:column;transition:.22s}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--blue-500);color:var(--text)}
.product-img{background:linear-gradient(180deg,#F7FAFD,#ECF1F7);aspect-ratio:1/1;display:flex;align-items:center;justify-content:center;padding:20px;position:relative}
.product-img img{max-height:240px;object-fit:contain;width:100%;transition:.28s}
.product-card:hover .product-img img{transform:scale(1.05)}
.product-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--line);flex:1}
.model-tag{display:inline-block;background:var(--orange-100);color:var(--orange-600);font-size:12px;font-weight:800;padding:4px 11px;border-radius:3px;align-self:flex-start;letter-spacing:.6px}
.product-body h3{font-size:16px;color:var(--navy-800);line-height:1.35}
.product-body p{font-size:13.5px;color:var(--muted);flex:1}
.product-link{color:var(--orange-500);font-weight:800;font-size:14px}

/* ================= Why（非对称分栏） ================= */
.why-section{position:relative;background:
  radial-gradient(760px 360px at 100% 0%,rgba(46,134,222,.22),transparent 60%),
  linear-gradient(160deg,var(--navy-950),var(--navy-900))}
.why-section::before{content:"";position:absolute;inset:0;background-image:var(--grid-lines);background-size:46px 46px;opacity:.5}
.why-wrap{position:relative;display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;align-items:center}
.why-side .section-head{margin:0 0 28px;text-align:left}
.why-side .section-head h2{color:#fff}
.why-side .section-head p{color:#AFC3D6}
.why-side p.why-lead{font-size:15.5px;color:#B8CCE0;line-height:1.75;margin-bottom:28px;max-width:420px}
.why-side .btn{margin-top:6px}
.why-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.why-item{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-left:4px solid var(--orange-500);border-radius:10px;padding:26px 22px;transition:.2s}
.why-item:hover{background:rgba(255,255,255,.09)}
.why-icon{width:52px;height:52px;margin-bottom:16px;border-radius:10px;background:rgba(255,122,26,.15);border:1px solid rgba(255,122,26,.4);color:var(--orange-500);display:flex;align-items:center;justify-content:center}
.why-item h3{font-size:16.5px;color:#fff;margin-bottom:7px}
.why-item p{font-size:13px;color:#AFC3D6;line-height:1.6}

/* ================= 应用场景 ================= */
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.app-card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:26px 22px;overflow:hidden;transition:.2s}
.app-card::before{content:"";position:absolute;left:0;top:0;width:100%;height:4px;background:linear-gradient(90deg,var(--orange-500),var(--blue-500));transform:scaleX(0);transform-origin:left;transition:.25s}
.app-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.app-card:hover::before{transform:scaleX(1)}
.app-card h3{font-size:16.5px;color:var(--navy-800);margin-bottom:8px}
.app-card p{font-size:13.5px;color:var(--muted)}
.app-row{display:grid;grid-template-columns:380px 1fr;gap:48px;align-items:center;padding:40px 0;border-bottom:1px solid var(--line)}
.app-row:last-child{border-bottom:0}
.app-row.reverse{grid-template-columns:1fr 380px}
.app-row.reverse .app-illus{order:2}
.app-illus{display:flex;align-items:center;justify-content:center;border-radius:16px;min-height:210px;background:linear-gradient(135deg,var(--blue-100),#F0F6FD);border:1px solid var(--line)}
.app-illus img{width:100%;height:230px;object-fit:cover;border-radius:12px;display:block}
.app-content h2{color:var(--navy-800);font-size:26px;margin-bottom:12px}
.app-content p{color:var(--muted);margin-bottom:18px;max-width:640px}
.app-tag{display:inline-block;background:var(--orange-100);color:var(--orange-600);font-size:12px;font-weight:700;padding:4px 13px;border-radius:3px;margin-bottom:12px;letter-spacing:.5px}

/* ================= CTA（斜切橙色大区） ================= */
.cta-band{position:relative;background:linear-gradient(120deg,var(--orange-600),var(--orange-500));color:#fff;padding:74px 0;overflow:hidden}
.cta-band::before{content:"";position:absolute;left:0;top:-40px;width:100%;height:80px;background:var(--bg);clip-path:polygon(0 0,100% 0,100% 100%,0 62%)}
.cta-band::after{content:"";position:absolute;right:-90px;top:-90px;width:300px;height:300px;border-radius:50%;background:rgba(255,255,255,.14)}
.cta-inner{position:relative;z-index:2;text-align:center}
.cta-inner h2{font-size:clamp(28px,3.2vw,40px);margin-bottom:12px;letter-spacing:-.3px}
.cta-inner p{color:rgba(255,255,255,.92);max-width:640px;margin:0 auto 30px;font-size:16px}
.cta-band .btn-ghost{display:inline-block;padding:14px 38px;border-radius:4px;background:#fff;color:var(--orange-600);font-weight:800;font-size:16px;letter-spacing:.3px;transition:.18s}
.cta-band .btn-ghost:hover{background:var(--navy-950);color:#fff}

/* ================= 按钮 ================= */
.btn{display:inline-block;padding:13px 28px;border-radius:4px;font-size:15px;font-weight:700;cursor:pointer;border:2px solid transparent;transition:.18s;letter-spacing:.2px}
.btn-primary{background:var(--orange-500);color:#fff}
.btn-primary:hover{background:var(--orange-600);color:#fff;box-shadow:0 10px 26px rgba(255,122,26,.4)}
.btn-outline{border-color:rgba(255,255,255,.7);color:#fff;background:transparent}
.btn-outline:hover{background:#fff;color:var(--navy-900);border-color:#fff}
.btn-lg{padding:16px 40px;font-size:16px}
.btn-block{display:block;text-align:center;margin-top:14px}

/* ================= 内页头部 ================= */
.page-hero{position:relative;color:#fff;overflow:hidden;background:
  radial-gradient(640px 280px at 85% -10%,rgba(46,134,222,.28),transparent 60%),
  linear-gradient(150deg,var(--navy-950),var(--navy-800) 70%,var(--navy-600));padding:58px 0}
.page-hero::before{content:"";position:absolute;inset:0;background-image:var(--grid-lines);background-size:42px 42px;opacity:.5}
.page-hero::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:5px;background:linear-gradient(90deg,var(--orange-500),var(--blue-500))}
.page-hero .container{position:relative;z-index:2}
.page-hero.compact{padding:38px 0}
.page-hero h1{font-size:clamp(28px,3vw,38px);margin-bottom:8px;letter-spacing:-.2px}
.page-hero p{color:#C9DAEC;max-width:700px}
.crumbs{font-size:13px;color:#8FA6BC;margin-bottom:8px}
.crumbs a{color:#C9DAEC}
.crumbs a:hover{color:#fff}

/* ================= 侧栏布局 ================= */
.layout-sidebar{display:grid;grid-template-columns:270px 1fr;gap:38px;align-items:start}
.sidebar{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px;position:sticky;top:84px}
.sidebar h3{font-size:15px;color:var(--navy-800);margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--orange-500)}
.side-nav a{display:block;padding:10px 14px;border-radius:6px;color:var(--text);font-size:14.5px;margin-bottom:3px}
.side-nav a:hover{background:var(--blue-100);color:var(--navy-800)}
.side-nav a.on{background:var(--navy-800);color:#fff}
.contact-info ul li{padding:13px 0;border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}
.contact-info ul li:last-child{border-bottom:0}
.contact-info ul li b{color:var(--navy-800)}
.content-main h2{color:var(--navy-800);font-size:26px;margin-bottom:24px}
.empty{color:var(--muted);padding:40px 0;text-align:center}

/* ================= 产品详情 ================= */
.product-detail{display:grid;grid-template-columns:440px 1fr;gap:42px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:32px}
.pd-img{background:linear-gradient(180deg,#F7FAFD,#ECF1F7);border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;justify-content:center;aspect-ratio:1/1;padding:24px}
.pd-img img{max-height:370px;object-fit:contain;width:100%}
.pd-model{display:inline-block;background:var(--orange-100);color:var(--orange-600);font-size:13px;font-weight:800;padding:5px 13px;border-radius:3px;margin-bottom:16px;letter-spacing:.6px}
.pd-summary{font-size:16px;color:var(--text);margin-bottom:22px}
.pd-cta{margin-bottom:28px}
.pd-specs h3{font-size:18px;color:var(--navy-800);margin-bottom:14px;border-left:4px solid var(--orange-500);padding-left:12px}
.pd-specs table{width:100%;border-collapse:collapse;font-size:14px}
.pd-specs th,.pd-specs td{border:1px solid var(--line);padding:11px 14px;text-align:left}
.pd-specs th{background:var(--blue-100);width:42%;color:var(--navy-800)}
.pd-desc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:30px 32px;margin-top:28px}
.pd-desc h3{color:var(--navy-800);font-size:20px;margin-bottom:14px;border-left:4px solid var(--orange-500);padding-left:12px}
.pd-desc p{margin-bottom:10px;color:var(--text)}
.related-block{margin-top:42px}
.related-block h3{color:var(--navy-800);font-size:20px;margin-bottom:18px;border-left:4px solid var(--orange-500);padding-left:12px}

/* ================= 表单 ================= */
.inquiry-form{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:32px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-field{display:flex;flex-direction:column;gap:6px}
.form-full{grid-column:1/-1}
.form-field label{font-size:13.5px;font-weight:600;color:var(--navy-800)}
.form-field input,.form-field select,.form-field textarea{padding:11px 13px;border:1px solid #C9D5DF;border-radius:6px;font-size:14.5px;font-family:inherit;background:#fff;color:var(--text)}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{outline:2px solid var(--blue-200);border-color:var(--blue-500)}
.inquiry-form .btn{margin-top:26px}

/* ================= 提示 ================= */
.alert{border-radius:10px;padding:16px 18px;margin-bottom:24px;font-size:14.5px}
.alert-success{background:#e8f5e9;border:1px solid #a5d6a7;color:#1b5e20}
.alert-error{background:#fdecea;border:1px solid #ef9a9a;color:#b71c1c}

/* ================= 页脚 ================= */
.site-footer{background:var(--navy-950);color:#AFC3D6;border-top:6px solid var(--orange-500)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:38px;padding:60px 24px 46px}
.f-brand{font-size:20px;font-weight:800;letter-spacing:3px;color:#fff;margin-bottom:14px}
.f-brand span{display:block;font-size:10.5px;font-weight:400;letter-spacing:2.4px;text-transform:uppercase;color:var(--orange-500);margin-top:4px}
.f-col p{font-size:13.5px;color:#8FA6BC;max-width:290px;line-height:1.8}
.f-col h4{color:#fff;font-size:15px;margin-bottom:16px;letter-spacing:.8px;text-transform:uppercase}
.f-col ul li{margin-bottom:10px}
.f-col ul a{color:#8FA6BC;font-size:14px}
.f-col ul a:hover{color:var(--orange-500)}
.f-contact li{font-size:14px;color:#8FA6BC;display:flex;gap:9px;align-items:flex-start}
.f-contact svg{flex:none;margin-top:3px;color:var(--orange-500)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.10);padding:18px 0;font-size:12.5px;color:#64788F}
.footer-bottom .container{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.footer-langs a{color:#AFC3D6;margin:0 3px}
.footer-langs a:hover{color:var(--orange-500)}

/* ================= WhatsApp 浮标 ================= */
.wa-float{position:fixed;right:22px;bottom:22px;z-index:200}
.wa-btn{width:56px;height:56px;border-radius:50%;background:#25D366;border:0;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 14px rgba(37,211,102,.45);transition:.18s}
.wa-btn:hover{transform:scale(1.06)}
.wa-panel{display:none;position:absolute;right:0;bottom:66px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);width:220px;padding:14px;text-align:center}
.wa-float.open .wa-panel{display:block}
.wa-head{display:block;background:#25D366;color:#fff;font-weight:600;font-size:14px;padding:9px 12px;border-radius:6px;margin-bottom:10px}
.wa-head:hover{color:#fff;opacity:.92}
.wa-qr{width:150px;height:150px;object-fit:contain;margin:0 auto 8px;border:1px solid var(--line);border-radius:6px}
.wa-num{font-size:13px;color:var(--muted)}

/* ================= 响应式 ================= */
@media (max-width:1024px){
  .why-wrap{grid-template-columns:1fr;gap:40px}
}
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:40px;padding:72px 24px 80px}
  .hero-media{order:-1}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .cat-card:nth-child(2){transform:none}
  .cat-card:nth-child(2):hover{transform:translateY(-6px)}
  .cat-card:nth-child(3){grid-column:1/-1}
  .why-grid{grid-template-columns:1fr 1fr}
  .app-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .product-detail{grid-template-columns:1fr}
  .layout-sidebar{grid-template-columns:1fr}
  .sidebar{position:static}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .stats-grid{justify-content:flex-start}
}
@media (max-width:768px){
  .nav-toggle{display:flex}
  .main-nav{display:none;position:absolute;top:66px;left:0;right:0;background:var(--navy-950);flex-direction:column;padding:14px 20px 20px;border-bottom:1px solid rgba(255,255,255,.10);box-shadow:0 12px 24px rgba(0,0,0,.3);align-items:stretch}
  .main-nav.open{display:flex}
  .main-nav a{padding:13px;border-radius:6px}
  .main-nav a::after{display:none}
  .hero-copy h1{font-size:34px}
  .stats-grid{grid-template-columns:1fr 1fr;gap:8px 14px}
  .cat-grid{grid-template-columns:1fr}
  .cat-card:nth-child(3){grid-column:auto}
  .why-grid{grid-template-columns:1fr}
  .app-row,.app-row.reverse{grid-template-columns:1fr}
  .app-row.reverse .app-illus{order:0}
  .form-grid{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr 1fr}
}
@media (max-width:520px){
  .app-grid,.grid-3{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
  .brand-text small{display:none}
  .hero-copy h1{font-size:28px}
}