/* =========================================================
   海南文南信息科技 · 官网样式
   配色取自公司 logo：主色 #008CD4（亮蓝）/ 辅色 #50638E（石板蓝）
   布局：Flexbox + Grid，断点 1024 / 768 / 480
   字体：中文优先微软雅黑，全部为系统字体，不加载外部字体
   ========================================================= */

:root{
  --navy-950:#152B4C;
  --navy-900:#1B3358;
  --navy-800:#223A63;
  --slate-500:#50638E;
  --blue-700:#0665A5;
  --blue-600:#0676B4;
  --blue-500:#008CD4;
  --blue-100:#CFE8F8;
  --blue-050:#F0F7FC;

  --ink-900:#15202E;
  --ink-700:#33465C;
  --ink-500:#5B6B7E;
  --ink-400:#8A99AA;

  --line:#E1EAF2;
  --white:#fff;
  --radius:14px;
  --radius-sm:9px;
  --shadow-sm:0 1px 2px rgba(34,58,99,.06), 0 4px 14px rgba(34,58,99,.05);
  --shadow-md:0 10px 30px rgba(34,58,99,.12);
  --max:1240px;
  --header-h:68px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 12px)}
body{
  margin:0;
  font-family:"Microsoft YaHei","微软雅黑",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-900);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.3;color:var(--navy-800)}
p{margin:0 0 12px}
ul{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
/* 宽屏（2K 屏 150% 缩放约 1700px）放宽容器，否则两侧留白过大 */
@media (min-width:1500px){:root{--max:1380px}.container{padding:0 32px}}

/* 无障碍：键盘用户跳转链接，默认隐藏、聚焦时出现 */
.skip-link{position:absolute;left:-9999px;top:0;background:var(--blue-600);color:#fff;padding:8px 16px;z-index:99}
.skip-link:focus{left:12px;top:12px}

:focus-visible{outline:2px solid var(--blue-500);outline-offset:2px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 26px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:700;cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease;
}
.btn-sm{padding:8px 18px;font-size:14px}
.btn-primary{background:linear-gradient(135deg,var(--blue-600),var(--blue-500));color:#fff;box-shadow:0 6px 18px rgba(0,140,212,.30)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,140,212,.40)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;height:var(--header-h);z-index:50;
  background:rgba(255,255,255,.9);backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
}
.site-header.is-scrolled{border-bottom-color:var(--line);box-shadow:0 2px 14px rgba(34,58,99,.07)}
/* 阅读进度：随滚动填充的一条品牌蓝细线 */
.site-header::after{
  content:"";position:absolute;left:0;bottom:-1px;height:2px;width:100%;
  background:linear-gradient(90deg,var(--blue-700),var(--blue-500));
  transform:scaleX(var(--progress,0));transform-origin:0 50%;
  opacity:calc(var(--progress,0) * 2);
}
.header-inner{height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:20px}

.brand{display:flex;align-items:center;gap:10px}
/* 公司 logo 图形（W 标），透明 PNG，高度随导航栏缩放 */
.brand-logo{width:auto;height:38px;flex:none;display:block}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:16px;color:var(--navy-800)}
.brand-text em{font-size:9.5px;letter-spacing:.09em;color:var(--ink-400);font-style:normal}

.main-nav{display:flex;align-items:center;gap:22px}
.main-nav ul{display:flex;gap:4px}
.nav-link{
  display:block;padding:8px 12px;font-size:15px;color:var(--ink-700);border-radius:8px;
  position:relative;white-space:nowrap;transition:color .18s ease;
}
.nav-link:hover{color:var(--blue-600)}
.nav-link.is-active{color:var(--blue-600);font-weight:700}
/* 当前栏目下方一条 2px 蓝色短线，悬停时从左往右扫出 */
.nav-link::before{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--blue-500);border-radius:2px;
  transform:scaleX(0);transform-origin:0 50%;transition:transform .26s ease;
}
.nav-link:hover::before,.nav-link.is-active::before{transform:scaleX(1)}

.nav-toggle{display:none;width:42px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;padding:0;align-items:center;justify-content:center;flex-direction:column;gap:4px}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--navy-800);border-radius:2px;transition:transform .2s ease, opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  display:flex;align-items:center;
  min-height:min(92vh,880px);
  background:linear-gradient(150deg,var(--navy-800) 0%,#1B5587 48%,#0E6FA8 100%);
  color:#fff;
  padding:calc(var(--header-h) + 84px) 0 96px;
}
/* 背景四层：底图（Ken Burns 推移 + 视差）/ 网格 / 光晕 / 压暗遮罩 */
.hero-bg{position:absolute;inset:-9% 0;z-index:0;pointer-events:none;
  transform:translate3d(0,var(--par,0px),0);will-change:transform}
.hero-photo{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:62% 50%;
  animation:kenburns 28s ease-in-out infinite alternate;will-change:transform;
}
@keyframes kenburns{
  from{transform:scale(1.06) translate3d(-1.2%,0,0)}
  to{transform:scale(1.16) translate3d(1.6%,-1.4%,0)}
}
/* 细网格底纹：科技感但不抢眼 */
.hero-grid{position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:52px 52px;
  mask-image:radial-gradient(circle at 30% 20%,#000 20%,transparent 72%);
  -webkit-mask-image:radial-gradient(circle at 30% 20%,#000 20%,transparent 72%);
}
.glow{position:absolute;border-radius:50%;filter:blur(70px);opacity:.55;animation:drift 19s ease-in-out infinite alternate}
.glow-a{width:420px;height:420px;background:rgba(0,140,212,.6);top:-140px;right:-60px}
.glow-b{width:360px;height:360px;background:rgba(80,99,142,.55);bottom:-160px;left:-80px;animation-duration:24s}
@keyframes drift{from{transform:translate3d(0,0,0)}to{transform:translate3d(-46px,34px,0)}}
/* 遮罩：左侧压暗托住标题，右侧留出底图的亮部 */
.hero-scrim{position:absolute;inset:0;
  background:
    linear-gradient(100deg,rgba(15,32,56,.90) 0%,rgba(20,45,79,.70) 38%,rgba(14,111,168,.30) 74%,rgba(14,111,168,.12) 100%),
    linear-gradient(180deg,rgba(21,43,76,.55) 0%,transparent 30%,transparent 62%,rgba(21,43,76,.45) 100%);
}

/* 宽屏两栏：左文案、右品牌视觉，统计条横跨整行 */
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;column-gap:52px;max-width:none;margin-left:0}
.hero-copy{grid-column:1;max-width:760px}
.hero-visual{grid-column:2;position:relative;display:grid;place-items:center;width:min(34vw,420px);aspect-ratio:1;
  transform:translate3d(calc(var(--mx,0) * 12px),calc(var(--my,0) * 12px),0);transition:transform .6s cubic-bezier(.22,.68,.32,1)}
.hero-mark{width:72%;opacity:.17}
.hero-ring{position:absolute;inset:8%;border:1px solid rgba(255,255,255,.16);border-radius:50%}
.hero-ring--out{inset:-4%;border-color:rgba(255,255,255,.09);animation:spin 36s linear infinite}
/* 外环上走一颗光点 */
.hero-ring--out::after{content:"";position:absolute;top:-5px;left:50%;width:9px;height:9px;margin-left:-4.5px;
  border-radius:50%;background:var(--blue-500);box-shadow:0 0 14px 4px rgba(0,140,212,.8)}
@keyframes spin{to{transform:rotate(360deg)}}
.hero-tag{
  display:inline-block;margin:0 0 20px;padding:6px 14px;border-radius:999px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);
  font-size:13px;letter-spacing:.02em;color:#EAF5FD;
}
.hero h1{
  color:#fff;margin:0 0 18px;
  font-size:clamp(30px,5.2vw,50px);line-height:1.24;letter-spacing:-.01em;
}
.hero-sub{font-size:clamp(15px,1.7vw,17.5px);color:#DCEDF9;max-width:720px;margin-bottom:28px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:44px}

.hero-stats{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:14px 42px;padding-top:24px;border-top:1px solid rgba(255,255,255,.22)}
.hero-stats li{display:flex;flex-direction:column;min-width:110px}
.hero-stats strong{font-size:26px;line-height:1.2;color:#fff;font-weight:700}
.hero-stats span{font-size:13px;color:#C7DDF0}

/* 向下滚动提示（参考华为首屏的滚轮动效） */
.scroll-cue{position:absolute;left:50%;bottom:26px;z-index:2;transform:translateX(-50%)}
.mouse{display:block;width:23px;height:36px;border:1.6px solid rgba(255,255,255,.6);border-radius:12px;position:relative}
.mouse::after{content:"";position:absolute;left:50%;top:7px;width:3px;height:7px;margin-left:-1.5px;
  border-radius:2px;background:#fff;animation:mouse_scroll 2s ease infinite}
@keyframes mouse_scroll{
  0%{opacity:0;transform:translateY(0)}
  22%{opacity:1}
  72%{opacity:0;transform:translateY(13px)}
  100%{opacity:0;transform:translateY(0)}
}

/* ---------- 通用段落 ---------- */
.section{padding:88px 0}
.section-alt{background:var(--blue-050);border-block:1px solid var(--line)}
.section-head{max-width:760px;margin:0 auto 44px;text-align:center}
.eyebrow{
  display:inline-block;margin:0 0 12px;padding:4px 12px;border-radius:999px;
  background:var(--blue-100);color:var(--blue-700);
  font-size:13px;font-weight:700;letter-spacing:.04em;
}
.section-head h2{font-size:clamp(23px,3vw,32px);margin-bottom:12px}
.section-sub{color:var(--ink-500);font-size:15.5px;margin:0}

/* 带场景底图的段落：图片在下、浅色遮罩居中、内容在最上 */
.section-photo{position:relative;overflow:hidden;isolation:isolate}
.section-photo .container{position:relative;z-index:2}
.section-bg{
  position:absolute;left:0;width:100%;top:-8%;height:116%;
  object-fit:cover;object-position:center;z-index:0;opacity:.62;
  transform:translate3d(0,var(--par,0px),0);will-change:transform;
}
/* 遮罩左重右轻：左侧托住文字，右侧让大屏那块的深色轮廓透出来；上下渐隐接回底色 */
.section-scrim{position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(100deg,rgba(240,247,252,.95) 0%,rgba(240,247,252,.88) 46%,rgba(240,247,252,.64) 100%),
    linear-gradient(180deg,rgba(240,247,252,.94) 0%,transparent 24%,transparent 76%,rgba(240,247,252,.94) 100%)}

.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ---------- 卡片 ---------- */
.card{
  position:relative;overflow:hidden;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;box-shadow:var(--shadow-sm);
  transition:transform .24s cubic-bezier(.22,.68,.32,1), box-shadow .24s ease, border-color .24s ease;
}
/* 顶部色条：悬停时从左往右拉开 */
.card::before{
  content:"";position:absolute;left:0;top:0;width:100%;height:3px;z-index:1;
  background:linear-gradient(90deg,var(--blue-700),var(--blue-500));
  transform:scaleX(0);transform-origin:0 50%;transition:transform .34s ease;
}
/* 斜向扫光 */
.card::after{
  content:"";position:absolute;inset:-40% -10%;z-index:0;pointer-events:none;
  background:linear-gradient(115deg,transparent 34%,rgba(0,140,212,.10) 47%,transparent 60%);
  transform:translateX(-115%);transition:transform .85s ease;
}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:var(--blue-100)}
.card:hover::before{transform:scaleX(1)}
.card:hover::after{transform:translateX(115%)}
.card h3{font-size:18px;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--ink-500);line-height:1.8;margin:0 0 8px}

/* 图标块：全站统一「浅蓝底 + 品牌蓝描边线稿」，与 eyebrow 胶囊、联系方式小图标同一套语言；
   实心渐变改成悬停时才浮出（::before 叠层淡入，background-image 本身不可过渡） */
.icon{
  width:52px;height:52px;border-radius:14px;margin-bottom:18px;
  position:relative;z-index:1;isolation:isolate;
  display:flex;align-items:center;justify-content:center;
  background:var(--blue-050);border:1px solid var(--blue-100);color:var(--blue-600);
  transition:color .26s ease, border-color .26s ease, transform .3s cubic-bezier(.22,.68,.32,1), box-shadow .3s ease;
}
.icon::before{
  content:"";position:absolute;inset:-1px;border-radius:inherit;z-index:-1;opacity:0;
  background:linear-gradient(135deg,var(--slate-500),var(--blue-500));
  transition:opacity .3s ease;
}
.icon svg{position:relative}
.card:hover .icon{color:#fff;border-color:transparent;transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,140,212,.26)}
.card:hover .icon::before{opacity:1}
.service-card{position:relative}
.service-card h3,.service-card p{position:relative;z-index:1}
.deliver{
  font-size:13px !important;color:var(--blue-700) !important;
  padding-top:10px;margin-top:6px !important;border-top:1px dashed var(--line);
}
.mini-card{padding:22px 20px}
.mini-card h3{font-size:16.5px}
.mini-card p{font-size:14px;margin:0}

/* ---------- 案例 ---------- */
.case{display:grid;grid-template-columns:1.55fr 1fr;gap:28px;align-items:start}
.case-main{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 30px 20px;box-shadow:var(--shadow-sm);
}
.case-block{margin-bottom:22px}
.case-block h3{font-size:16px;margin-bottom:8px;padding-left:12px;border-left:3px solid var(--blue-500);line-height:1.4}
.case-block p{font-size:15px;color:var(--ink-700);margin:0}
.tick-list li{
  position:relative;padding-left:24px;font-size:15px;color:var(--ink-700);margin-bottom:8px;
}
.tick-list li::before{
  content:"";position:absolute;left:0;top:9px;width:14px;height:8px;
  border-left:2px solid var(--blue-500);border-bottom:2px solid var(--blue-500);
  transform:rotate(-45deg);
}
.case-side{
  background:linear-gradient(165deg,var(--navy-800),#0E6FA8);color:#fff;
  border-radius:var(--radius);padding:26px 24px;
}
.case-side dl{margin:0}
.case-side dl>div{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.18)}
.case-side dl>div:last-child{border-bottom:0}
.case-side dt{font-size:12.5px;color:#A9CBE4;letter-spacing:.03em}
.case-side dd{margin:4px 0 0;font-size:15px;font-weight:700;color:#fff}
.case-note{margin:16px 0 0;font-size:12.5px;color:#BCD9EE}

/* ---------- 关于我们 ---------- */
.about{display:grid;grid-template-columns:1.2fr 1fr;gap:44px;align-items:start}
.about-text h2{font-size:clamp(22px,2.6vw,28px);margin-bottom:14px}
.about-text p{font-size:15.5px;color:var(--ink-700)}
.brand-marks{margin-top:18px}
.brand-marks li{
  font-size:14.5px;color:var(--navy-800);padding:10px 14px;margin-bottom:10px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
}
.brand-marks span{color:var(--ink-400);font-size:12.5px;letter-spacing:.06em}

.about-info{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
.about-info h3{font-size:17px;margin-bottom:14px;padding-bottom:12px;border-bottom:2px solid var(--blue-050)}
.info-list{margin:0}
.info-list>div{display:grid;grid-template-columns:112px 1fr;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}
.info-list>div:last-child{border-bottom:0}
.info-list dt{font-size:13px;color:var(--ink-400)}
.info-list dd{margin:0;font-size:13.5px;color:var(--ink-900);word-break:break-all}

/* ---------- 联系我们 ---------- */
.contact{display:grid;grid-template-columns:1fr 1.25fr;gap:32px;align-items:start}
.contact-info ul{display:flex;flex-direction:column;gap:6px}
.contact-info li{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.contact-info li:last-child{border-bottom:0}
.icon-sm{
  width:38px;height:38px;flex:none;border-radius:12px;
  background:var(--blue-050);border:1px solid var(--blue-100);color:var(--blue-700);
  display:flex;align-items:center;justify-content:center;
}
.contact-info strong{display:block;font-size:14.5px;color:var(--navy-800);margin-bottom:2px}
.contact-info p{font-size:14.5px;color:var(--ink-500);margin:0}
.contact-info a:hover{color:var(--blue-600)}

.contact-form{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow-sm);
}
.field{display:block;margin-bottom:16px}
.field span{display:block;font-size:13.5px;font-weight:700;color:var(--ink-700);margin-bottom:6px}
.field i{color:#E04A4A;font-style:normal}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
input,select,textarea{
  width:100%;padding:11px 13px;font-family:inherit;font-size:14.5px;color:var(--ink-900);
  background:#FBFCFE;border:1px solid var(--line);border-radius:var(--radius-sm);
  transition:border-color .16s ease, box-shadow .16s ease, background-color .16s ease;
}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--blue-500);background:#fff;
  box-shadow:0 0 0 3px rgba(0,140,212,.18);
}
textarea{resize:vertical;min-height:96px}
.form-foot{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.form-hint{margin:0;font-size:13.5px;color:var(--ink-500)}
.form-hint.is-error{color:#D0342C;font-weight:700}
.form-hint.is-ok{color:var(--blue-700);font-weight:700}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;isolation:isolate;overflow:hidden;background:var(--navy-950);color:#B6CCE4;padding:56px 0 0;font-size:14px}
.footer-bg{position:absolute;inset:0;z-index:0;width:100%;height:100%;object-fit:cover;opacity:.38}
/* 压在底图之上的暗色遮罩，保证页脚文字对比度 */
.site-footer::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,rgba(21,43,76,.88) 0%,rgba(21,43,76,.80) 46%,rgba(21,43,76,.94) 100%)}
.footer-grid,.footer-bottom{position:relative;z-index:2}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;padding-bottom:36px}
.footer-brand p{margin:16px 0 0;font-size:13.5px;color:#A5BEDA;max-width:320px}
.brand--light .brand-text strong{color:#fff}
.brand--light .brand-text em{color:#9BB4D2}
/* 深色页脚上给 logo 加白色底片，避免石板蓝那半与底色糊在一起 */
.brand--light .brand-logo{height:32px;width:auto;padding:5px;background:#fff;border-radius:10px;box-sizing:content-box}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer-col li{margin-bottom:9px;font-size:13.5px}
.footer-col a:hover{color:#fff}
.footer-bottom{
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  padding:18px 24px 22px;margin:0 auto;max-width:var(--max);
  border-top:1px solid rgba(255,255,255,.14);font-size:12.5px;color:#9BB4D2;
}
.footer-bottom p{margin:0}
.footer-bottom a{color:#B4CFEC}
.footer-bottom a:hover{color:#fff}

/* ---------- 回到顶部 ---------- */
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:40;
  width:44px;height:44px;border-radius:50%;border:1px solid var(--line);
  background:#fff;color:var(--navy-800);cursor:pointer;
  display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s ease, transform .22s ease, visibility .22s;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{color:var(--blue-600)}

/* =========================================================
   动效：以下「先隐藏再进场」的规则全部挂在 .js 下，
   JS 未执行（脚本被拦 / 报错）时内容照常显示，不会白屏。
   ========================================================= */
.js .reveal{opacity:0;transform:translateY(24px);
  transition:opacity .66s ease, transform .66s cubic-bezier(.22,.68,.32,1);
  transition-delay:calc(var(--i,0) * 70ms)}
.js .reveal.is-visible{opacity:1;transform:none}

/* 段落标题三行依次进场（容器本身不做整体淡入） */
.js .section-head.reveal{opacity:1;transform:none}
.js .section-head>*{opacity:0;transform:translateY(16px);
  transition:opacity .62s ease, transform .62s cubic-bezier(.22,.68,.32,1)}
.js .section-head.is-visible>*{opacity:1;transform:none}
.js .section-head>:nth-child(2){transition-delay:.09s}
.js .section-head>:nth-child(3){transition-delay:.18s}

/* 首屏分级进场 */
@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
@keyframes line_up{from{transform:translateY(108%)}to{transform:none}}
.js .hero-copy>*:not(h1){animation:rise .8s cubic-bezier(.22,.68,.32,1) both}
.js .hero-copy>*:nth-child(1){animation-delay:.16s}
.js .hero-copy>*:nth-child(3){animation-delay:.46s}
.js .hero-copy>*:nth-child(4){animation-delay:.60s}
.js .hero-stats{animation:rise .8s cubic-bezier(.22,.68,.32,1) .86s both}
.js .scroll-cue{animation:rise .8s ease 1.5s both}
/* 标题按行遮罩上推 */
.hero h1 .ln{display:block;overflow:hidden;padding-bottom:.06em}
.js .hero h1 .ln>span{display:block;animation:line_up .92s cubic-bezier(.19,.72,.24,1) both}
.js .hero h1 .ln:nth-child(2)>span{animation-delay:.14s}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1024px){
  .hero-inner{grid-template-columns:1fr}
  .hero-visual{display:none}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .case,.about,.contact{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}

/* 导航在 1080px 以下折叠成抽屉：品牌 256 + 菜单 582 + 按钮 98 + 间距 42 + 内边距 48 ≈ 1026，
   再加滚动条与余量；低于这个宽度 7 个菜单项就会被挤成两行，所以断点从 992 提到 1080 */
@media (max-width:1080px){
  .nav-toggle{display:flex}
  .main-nav{
    position:fixed;left:0;right:0;top:var(--header-h);bottom:0;
    flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;
    background:#fff;padding:14px 24px 28px;
    transform:translateX(100%);transition:transform .28s ease;
    overflow-y:auto;
  }
  .main-nav.is-open{transform:none;box-shadow:0 12px 30px rgba(34,58,99,.16)}
  .main-nav ul{flex-direction:column;gap:0}
  .nav-link{padding:15px 4px;border-bottom:1px solid var(--line);font-size:16px}
  .nav-link::before{display:none}
  .nav-link.is-active{color:var(--blue-600)}
  .nav-cta{margin-top:20px;justify-content:center}
}

@media (max-width:768px){
  .section{padding:64px 0}
  .hero{padding:calc(var(--header-h) + 52px) 0 64px;min-height:min(88vh,700px)}
  .hero-photo{object-position:70% 50%}
  .hero-stats{gap:14px 26px}
  .hero-stats strong{font-size:22px}
  .scroll-cue{display:none}
}

@media (max-width:480px){
  .container{padding:0 18px}
  body{font-size:15px}
  .grid-3,.grid-4{grid-template-columns:1fr}
  .field-row{grid-template-columns:1fr}
  .hero-actions .btn{flex:1 1 100%}
  .info-list>div{grid-template-columns:1fr;gap:2px}
  .brand-text em{display:none}
  .case-main,.contact-form{padding:22px 18px}
  .to-top{right:14px;bottom:18px}
}

/* 用户设置了"减少动态效果"时全部关掉 */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .js .reveal,.js .section-head>*,.js .hero-copy>*,.js .hero-stats,.js .scroll-cue{opacity:1;transform:none}
  .hero-bg,.section-bg{transform:none}
}

@media print{
  .site-header,.to-top,.contact-form,.scroll-cue,.hero-photo,.section-bg,.footer-bg{display:none}
  .hero{background:#fff;color:#000;min-height:0}
  .hero-scrim,.section-scrim,.site-footer::after{display:none}
}