/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#15406b;
  --primary-2:#1d5286;
  --primary-dark:#0f3050;
  --accent:#2e9e6b;
  --accent-2:#37b87e;
  --accent-soft:#e9f6ef;
  --ink:#26303a;
  --muted:#6b7785;
  --line:#e6ebef;
  --bg:#ffffff;
  --bg-soft:#f6f8fa;
  --radius:12px;
  --shadow:0 10px 30px rgba(21,64,107,.08);
  --shadow-sm:0 4px 14px rgba(21,64,107,.06);
  --max:1180px;
}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{width:min(100% - 40px,var(--max));margin-inline:auto}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:600;font-size:15px;transition:.25s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-2);transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-2);transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-outline{background:#fff;color:var(--primary);border-color:var(--line)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary-2)}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:18px;color:var(--primary);letter-spacing:.5px}
.brand .logo{width:38px;height:38px;flex:0 0 auto}
.nav-links{display:flex;align-items:center;gap:6px;list-style:none}
.nav-links a{padding:9px 16px;border-radius:8px;font-weight:500;color:var(--ink);transition:.2s;font-size:15px}
.nav-links a:hover{color:var(--primary);background:var(--bg-soft)}
.nav-links a.active{color:#fff;background:var(--primary)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:42px;height:42px;padding:10px}
.nav-toggle span{display:block;height:2px;background:var(--ink);margin:4px 0;width:22px;transition:.3s}

/* ===== Hero ===== */
.hero{position:relative;background:linear-gradient(135deg,var(--primary-dark),var(--primary) 55%,var(--primary-2));color:#fff;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 82% 18%,rgba(46,158,107,.38),transparent 45%),radial-gradient(circle at 8% 92%,rgba(255,255,255,.08),transparent 42%);pointer-events:none}
.hero .container{position:relative;z-index:2;padding:92px 20px 104px}
.hero .tag{display:inline-block;padding:6px 16px;border:1px solid rgba(255,255,255,.35);border-radius:999px;font-size:13px;letter-spacing:2px;margin-bottom:24px;color:rgba(255,255,255,.9)}
.hero h1{font-size:clamp(30px,5vw,52px);line-height:1.22;font-weight:800;letter-spacing:1px;margin-bottom:18px}
.hero .lead{font-size:clamp(16px,2vw,20px);color:rgba(255,255,255,.85);max-width:700px;margin-bottom:12px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:32px}
.hero-stats{display:flex;gap:46px;flex-wrap:wrap;margin-top:56px;position:relative;z-index:2}
.hero-stats .num{font-size:34px;font-weight:800;color:#fff}
.hero-stats .num span{color:var(--accent-2)}
.hero-stats .lbl{font-size:14px;color:rgba(255,255,255,.75);margin-top:2px}

/* ===== Sections ===== */
.section{padding:86px 0}
.section.soft{background:var(--bg-soft)}
.section-head{text-align:center;max-width:720px;margin:0 auto 50px}
.section-head .eyebrow{color:var(--accent);font-weight:700;letter-spacing:3px;font-size:13px}
.section-head h2{font-size:clamp(26px,3.4vw,36px);margin:12px 0 14px;color:var(--primary-dark);font-weight:800}
.section-head p{color:var(--muted);font-size:16px}

/* cards */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;transition:.25s;box-shadow:var(--shadow-sm)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.card .ic{width:52px;height:52px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:22px;font-weight:800}
.card h3{font-size:19px;margin-bottom:10px;color:var(--primary-dark)}
.card p{color:var(--muted);font-size:15px}

/* brands */
.brands{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.brand-chip{display:flex;flex-direction:column;align-items:center;justify-content:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px 14px;text-align:center;font-weight:700;color:var(--primary);transition:.2s;text-decoration:none;cursor:pointer}
.brand-chip:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-3px);box-shadow:var(--shadow-sm)}
.brand-chip:active{transform:translateY(-1px)}
.brand-logo{height:38px;width:auto;max-width:100%;object-fit:contain;object-position:center;margin-bottom:10px;display:block;pointer-events:none}
.brand-logo--tall{height:46px}
.brand-chip:hover .brand-logo{transform:scale(1.04);transition:transform .2s}
.brand-chip small{display:block;font-weight:500;color:var(--muted);font-size:12px;margin-top:5px}

/* feature list */
.feat{list-style:none;display:grid;gap:14px}
.feat li{display:flex;gap:12px;align-items:flex-start}
.feat li .dot{flex:0 0 auto;width:24px;height:24px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;margin-top:2px}
.feat li b{color:var(--primary-dark)}

/* split */
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:50px;align-items:center}
.split .media{background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:18px;min-height:340px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;color:#fff;padding:30px;text-align:center}
.split .media .big{font-size:64px;font-weight:800;line-height:1.3;opacity:.96}
.split .media .sub{font-size:15px;opacity:.85;margin-top:10px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:step}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;position:relative;box-shadow:var(--shadow-sm)}
.step .no{font-size:13px;font-weight:800;color:var(--accent);letter-spacing:1px}
.step h3{font-size:18px;margin:8px 0 8px;color:var(--primary-dark)}
.step p{color:var(--muted);font-size:14px}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:40px}
.info-list{list-style:none;display:grid;gap:18px}
.info-list li{display:flex;gap:14px;align-items:flex-start}
.info-list .ic{width:44px;height:44px;flex:0 0 auto;border-radius:10px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800}
.info-list b{display:block;color:var(--primary-dark);font-size:15px}
.info-list span{color:var(--muted);font-size:15px}
.form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow-sm)}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:7px}
.field input,.field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:9px;font-size:15px;font-family:inherit;transition:.2s;background:var(--bg-soft)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--primary);background:#fff}
.field textarea{resize:vertical;min-height:120px}
.form .btn{width:100%;justify-content:center}
.form-note{font-size:14px;color:var(--accent);margin-top:12px;text-align:center;display:none}
.embed-form{margin-top:4px;border-radius:12px;overflow:hidden;background:#fff}
.embed-form iframe{display:block;width:100%;border:0}
.map{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);min-height:240px;display:flex;align-items:center;justify-content:center;color:var(--muted);text-align:center;padding:20px}

/* footer */
.site-footer{background:var(--primary-dark);color:rgba(255,255,255,.8);padding:56px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:36px}
.site-footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.site-footer a{color:rgba(255,255,255,.75);display:block;padding:5px 0;font-size:14px;transition:.2s}
.site-footer a:hover{color:#fff}
.site-footer .desc{font-size:14px;line-height:1.8;max-width:330px;color:rgba(255,255,255,.7)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;text-align:center;font-size:13px;color:rgba(255,255,255,.55)}

/* page hero */
.page-hero{background:linear-gradient(135deg,var(--primary-dark),var(--primary));color:#fff;padding:66px 0}
.page-hero h1{font-size:clamp(28px,4vw,40px);font-weight:800;margin-bottom:10px}
.page-hero p{color:rgba(255,255,255,.82);max-width:640px}

/* reveal */
[data-reveal]{opacity:0}
[data-reveal].in{animation:revealUp .6s cubic-bezier(.2,.7,.2,1) both;animation-delay:var(--d,0s)}
@keyframes revealUp{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}

/* responsive */
@media (max-width:980px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .brands{grid-template-columns:repeat(3,1fr)}
  .split,.contact-grid,.footer-grid{grid-template-columns:1fr}
  .split .media{order:-1}
  .steps{grid-template-columns:1fr}
}
@media (max-width:640px){
  .nav-links{position:fixed;inset:72px 0 auto 0;flex-direction:column;background:#fff;padding:18px;gap:4px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none}
  .nav-links.open{display:flex}
  .nav-links a{width:100%}
  .nav-toggle{display:block}
  .grid-3,.grid-4,.grid-2,.brands{grid-template-columns:1fr}
  .hero-stats{gap:24px}
  .section{padding:58px 0}
}

/* ===== Media: corporate video & product gallery ===== */
.video-frame{position:relative;width:100%;max-width:880px;margin:8px auto 0;aspect-ratio:16/9;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);background:#0f3050}
.video-frame video{width:100%;height:100%;display:block;object-fit:cover}

.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.gallery a{display:block;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:#fff;transition:.25s}
.gallery a:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.gallery img{width:100%;height:210px;object-fit:cover;transition:.4s}
.gallery a:hover img{transform:scale(1.06)}

/* scale strip */
.scale{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;text-align:center}
.scale .num{font-size:clamp(28px,4vw,42px);font-weight:800;color:var(--accent);line-height:1.1}
.scale .num span{color:var(--primary)}
.scale .lbl{font-size:14px;color:var(--muted);margin-top:8px}

/* lightbox */
.lightbox{position:fixed;inset:0;background:rgba(15,48,80,.92);display:none;align-items:center;justify-content:center;z-index:200;cursor:zoom-out;padding:24px}
.lightbox.show{display:flex}
.lightbox img{max-width:92%;max-height:88%;border-radius:10px;box-shadow:0 20px 60px rgba(0,0,0,.5)}

@media (max-width:980px){.gallery{grid-template-columns:repeat(3,1fr)}.scale{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.gallery{grid-template-columns:repeat(2,1fr)}.gallery img{height:150px}.scale{grid-template-columns:repeat(2,1fr)}}

/* ===================== 动效增强 ===================== */

/* A. 顶部导航滚动增强 */
.site-header{transition:box-shadow .3s ease,border-color .3s ease}
.site-header.scrolled{box-shadow:0 6px 26px rgba(21,64,107,.12);border-bottom-color:transparent}

/* B. 导航链接下划线滑入 */
.nav-links a{position:relative}
.nav-links a::after{content:"";position:absolute;left:16px;right:16px;bottom:6px;height:2px;background:var(--primary);border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform .25s ease}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1)}

/* C. 按钮高光 sweep */
.btn{position:relative;overflow:hidden}
.btn::after{content:"";position:absolute;top:0;left:-130%;width:55%;height:100%;background:linear-gradient(120deg,transparent,rgba(255,255,255,.4),transparent);transform:skewX(-20deg);pointer-events:none}
.btn:hover::after{left:140%;transition:left .6s ease}

/* D. 卡片精致 hover（顶部渐变光条 + 图标翻转填充） */
.card{position:relative;overflow:hidden}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));transform:scaleX(0);transform-origin:left;transition:transform .35s ease}
.card:hover::before{transform:scaleX(1)}
.card .ic{transition:transform .3s ease,background .3s ease,color .3s ease}
.card:hover .ic{background:var(--primary);color:#fff;transform:translateY(-2px) rotate(-6deg)}
.card h3{transition:color .25s ease}
.card:hover h3{color:var(--primary)}

/* E. 品牌卡片渐变描边光 + logo 上浮 */
.brand-chip{position:relative;overflow:hidden}
.brand-chip::before{content:"";position:absolute;inset:0;border-radius:10px;padding:1.5px;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .25s ease;pointer-events:none}
.brand-chip:hover::before{opacity:1}
.brand-chip:hover .brand-logo{transform:translateY(-4px) scale(1.06)}
.brand-chip:hover .brand-logo--tall{transform:translateY(-4px) scale(1.04)}

/* F. 章节标题下划线展开 */
.section-head{position:relative}
.section-head h2{display:inline-block;position:relative}
.section-head h2::after{content:"";position:absolute;left:50%;bottom:-10px;width:0;height:3px;border-radius:3px;background:linear-gradient(90deg,var(--primary),var(--accent));transform:translateX(-50%);transition:width .7s ease .15s}
.section-head.in h2::after{width:66px}

/* G. Hero 渐变流动 + 内容依次入场 */
.hero{background-size:220% 220%;animation:heroFlow 18s ease infinite}
@keyframes heroFlow{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
.hero .container>*{animation:heroIn .9s cubic-bezier(.2,.7,.2,1) both}
.hero .container>*:nth-child(1){animation-delay:.05s}
.hero .container>*:nth-child(2){animation-delay:.16s}
.hero .container>*:nth-child(3){animation-delay:.27s}
.hero .container>*:nth-child(4){animation-delay:.37s}
.hero .container>*:nth-child(5){animation-delay:.49s}
.hero .container>*:nth-child(6){animation-delay:.61s}
@keyframes heroIn{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}

/* H. 回到顶部按钮 */
#scrollTop{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border:0;border-radius:50%;background:var(--primary);color:#fff;font-size:20px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(14px);transition:opacity .3s ease,transform .3s ease,background .25s ease;z-index:120}
#scrollTop.show{opacity:1;visibility:visible;transform:none}
#scrollTop:hover{background:var(--accent);transform:translateY(-3px)}
#scrollTop:active{transform:translateY(-1px) scale(.96)}

/* I. 可访问性 focus 光环 */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,.brand-chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:8px}

/* J. 数字计数基底（由 JS 驱动） */
.cu{font-variant-numeric:tabular-nums;display:inline-block}

/* 全局降级：尊重 prefers-reduced-motion */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  [data-reveal]{opacity:1!important;transform:none!important;animation:none!important}
  .hero .container>*{opacity:1!important;transform:none!important;animation:none!important}
  .section-head h2::after{width:66px!important}
  .hero{animation:none!important}
}

/* 页面切换过渡：整页淡入 / 离场淡出（仅 opacity，不影响 fixed 定位） */
@keyframes pageEnter{from{opacity:0}to{opacity:1}}
@keyframes pageLeave{from{opacity:1}to{opacity:0}}
body{animation:pageEnter .5s ease both}
body.page-leave{animation:pageLeave .38s ease both}

/* ===== 布局与视觉优化（2026-08-19）===== */

/* 波浪分隔：首屏/内页头与下方内容区的柔和过渡 */
.hero-wave{position:relative;line-height:0;margin-top:-2px;z-index:2}
.hero-wave svg{display:block;width:100%;height:72px}
@media (max-width:640px){.hero-wave svg{height:44px}}

/* 首页行动召唤（CTA）视觉卡 */
.cta-band{position:relative;overflow:hidden;border-radius:20px;padding:58px 40px;text-align:center;background:linear-gradient(135deg,var(--primary-dark),var(--primary));color:#fff;box-shadow:var(--shadow)}
.cta-band::before{content:"";position:absolute;top:-45%;right:-8%;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.16),transparent 70%)}
.cta-band::after{content:"";position:absolute;bottom:-55%;left:-8%;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.10),transparent 70%)}
.cta-band>*{position:relative;z-index:1}
.cta-band h2{color:#fff;margin-bottom:12px}
.cta-band p{color:rgba(255,255,255,.86);max-width:580px;margin:0 auto 28px}
.cta-band .actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.cta-band .btn-primary{background:#fff;color:var(--primary-dark);border-color:#fff}
.cta-band .btn-primary:hover{background:rgba(255,255,255,.88);transform:translateY(-2px)}
.cta-band .btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.14);border-color:#fff;transform:translateY(-2px)}

/* 品牌 logo 统一对齐基线 */
.brand-logo{height:40px}
.brand-logo--tall{height:46px}