/* ============================================================
   数算寰宇 · 官网设计系统 v2
   深海蓝 #0B1F3A · 海雾蓝 #12325C · 信号青 #19C3B1 · 警示橙 #F2932F
   数字: Barlow Condensed · 中文: 系统黑体 · 圆角 4px
   ============================================================ */
:root{
  --deep:#0B1F3A;
  --deep-2:#12325C;
  --deep-3:#0E2A4A;
  --teal:#19C3B1;
  --teal-dim:rgba(25,195,177,.14);
  --orange:#F2932F;
  --paper:#F5F8FA;
  --white:#FFFFFF;
  --ink:#16222E;
  --ink-2:#5A6B7A;
  --ink-3:#8A99A8;
  --line:rgba(22,34,46,.12);
  --line-light:rgba(245,248,250,.16);
  --r:4px;
  --r-lg:10px;
  --pad:clamp(20px,5vw,72px);
  --maxw:1280px;
  --font-num:"Barlow Condensed","Arial Narrow",sans-serif;
  --shadow:0 12px 40px -16px rgba(11,31,58,.25);
  --header-h:64px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",system-ui,sans-serif;
  color:var(--ink);background:var(--white);
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
::selection{background:var(--teal);color:var(--deep)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}

/* 数字排版 */
.num{font-family:var(--font-num);font-weight:600;letter-spacing:.01em;line-height:1}
.stat-num{font-family:var(--font-num);font-size:clamp(34px,4vw,52px);font-weight:600;line-height:1;letter-spacing:.01em}
.stat-label{font-size:13px;color:var(--ink-2);margin-top:6px}
.stat-note{font-size:12px;color:var(--ink-3)}

/* 区块标题 */
.sec{padding:clamp(72px,9vh,110px) 0}
.sec.paper{background:var(--paper)}
.sec.deep{background:var(--deep);color:var(--paper)}
.sec.deep .sec-desc{color:rgba(245,248,250,.6)}
.sec-head{max-width:760px;margin-bottom:clamp(40px,6vh,64px)}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-tag{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-num);font-size:13px;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;color:var(--teal);margin-bottom:14px;
}
.sec-tag::before{content:"";width:26px;height:2px;background:var(--teal)}
.sec-head.center .sec-tag{justify-content:center}
.sec-title{font-size:clamp(28px,3.4vw,42px);font-weight:600;letter-spacing:.01em;line-height:1.25}
.sec-desc{margin-top:14px;color:var(--ink-2);font-size:15px}
.sec-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}
.sec-head-row .sec-head{margin-bottom:0}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 26px;border:1px solid transparent;border-radius:var(--r);
  font-size:15px;font-weight:600;transition:all .25s ease;white-space:nowrap;
}
.btn .ar{transition:transform .25s}
.btn:hover .ar{transform:translateX(4px)}
.btn-teal{background:var(--teal);color:var(--deep)}
.btn-teal:hover{background:#2fd6c3;transform:translateY(-1px)}
.btn-line{border-color:var(--line);color:var(--ink)}
.btn-line:hover{border-color:var(--teal);color:var(--teal)}
.btn-line.on-dark{border-color:var(--line-light);color:var(--paper)}
.btn-line.on-dark:hover{border-color:var(--teal);color:var(--teal)}
.btn-ghost{border-color:rgba(25,195,177,.5);color:var(--teal);background:var(--teal-dim)}
.btn-ghost:hover{background:rgba(25,195,177,.24)}

/* 页头 */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);
  background:rgba(255,255,255,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:flex;align-items:center;gap:11px}
.logo-img{width:42px;height:42px;object-fit:contain;flex:none;display:block;border-radius:var(--r)}
.logo-img-on-dark{background:rgba(245,248,250,.94);padding:4px;border-radius:8px}
.logo-text b{display:block;font-size:17px;font-weight:700;letter-spacing:.06em;line-height:1.15}
.logo-text span{display:block;font-family:var(--font-num);font-size:10px;letter-spacing:.3em;color:var(--ink-3)}
.main-nav{display:flex;gap:6px}
.main-nav a{
  padding:8px 15px;font-size:15px;font-weight:500;color:var(--ink-2);border-radius:var(--r);
  transition:color .2s,background .2s;
}
.main-nav a:hover{color:var(--ink);background:var(--paper)}
.main-nav a.active{color:var(--deep);font-weight:600;background:var(--teal-dim)}
.hdr-right{display:flex;align-items:center;gap:14px}
.hdr-tel{display:flex;align-items:center;gap:8px;font-family:var(--font-num);font-size:17px;font-weight:600;color:var(--deep);letter-spacing:.02em}
.hdr-tel .ic{color:var(--teal);font-size:15px}
.hdr-cta{padding:9px 20px;font-size:14px}
.burger{display:none;width:42px;height:42px;border:0;background:none;position:relative}
.burger span{position:absolute;left:9px;right:9px;height:2px;background:var(--deep);transition:.3s}
.burger span:nth-child(1){top:14px}.burger span:nth-child(2){top:20px}.burger span:nth-child(3){top:26px}
body.menu-open .burger span:nth-child(1){top:20px;transform:rotate(45deg)}
body.menu-open .burger span:nth-child(2){opacity:0}
body.menu-open .burger span:nth-child(3){top:20px;transform:rotate(-45deg)}
.mnav{
  position:fixed;inset:0;z-index:99;background:var(--deep);
  display:flex;flex-direction:column;justify-content:center;padding:0 var(--pad);
  transform:translateY(-100%);transition:transform .4s cubic-bezier(.7,0,.3,1);
}
body.menu-open .mnav{transform:translateY(0)}
.mnav a{
  color:var(--paper);font-size:26px;font-weight:600;padding:16px 0;
  border-bottom:1px solid var(--line-light);display:flex;justify-content:space-between;
}
.mnav a small{font-family:var(--font-num);color:var(--teal);letter-spacing:.2em}
.mnav .m-tel{margin-top:30px;font-family:var(--font-num);font-size:24px;color:var(--teal);border:0}

/* 页内 banner（子页顶部） */
.page-hero{
  padding:calc(var(--header-h) + clamp(56px,9vh,96px)) 0 clamp(48px,7vh,80px);
  background:linear-gradient(160deg,var(--deep) 0%,var(--deep-3) 55%,var(--deep-2) 100%);
  color:var(--paper);position:relative;overflow:hidden;
}
.page-hero::after{
  content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;
  border:1px solid var(--line-light);
}
.page-hero::before{
  content:"";position:absolute;right:-60px;top:-60px;width:300px;height:300px;border-radius:50%;
  border:1px solid var(--line-light);
}
.page-hero .crumb{font-size:13px;color:rgba(245,248,250,.55);margin-bottom:18px;display:flex;gap:8px;align-items:center}
.page-hero .crumb a:hover{color:var(--teal)}
.page-hero .crumb i{font-style:normal;opacity:.5}
.page-hero h1{font-size:clamp(32px,4.6vw,52px);font-weight:600;line-height:1.2}
.page-hero .lead{margin-top:16px;max-width:640px;color:rgba(245,248,250,.68);font-size:16px}
.page-hero .ph-metrics{display:flex;gap:clamp(24px,4vw,56px);margin-top:36px;flex-wrap:wrap}
.page-hero .ph-metrics .stat-num{color:var(--teal)}
.page-hero .ph-metrics .stat-label{color:rgba(245,248,250,.6)}

/* 页脚 */
.site-footer{background:var(--deep);color:rgba(245,248,250,.72);padding:clamp(48px,7vh,72px) 0 0}
.ft-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:clamp(24px,4vw,56px)}
.ft-brand .logo-text b{color:var(--paper)}
.ft-brand .logo-text span{color:rgba(245,248,250,.4)}
.ft-brand p{margin-top:16px;font-size:13.5px;line-height:1.8;max-width:340px}
.ft-contact{margin-top:22px;display:flex;flex-direction:column;gap:9px;font-size:14px}
.ft-contact b{font-family:var(--font-num);letter-spacing:.18em;font-size:11px;color:rgba(245,248,250,.4);margin-right:8px}
.ft-contact a:hover{color:var(--teal)}
.ft-col h5{font-size:13px;letter-spacing:.18em;color:rgba(245,248,250,.45);margin-bottom:16px;font-weight:600}
.ft-col a{display:block;padding:6px 0;font-size:14.5px;transition:color .2s}
.ft-col a:hover{color:var(--teal)}
.ft-bottom{
  margin-top:clamp(36px,5vh,56px);padding:20px 0;border-top:1px solid var(--line-light);
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px;color:rgba(245,248,250,.4);
}
.ft-bottom a{margin-left:18px}
.ft-bottom a:hover{color:var(--teal)}

/* 悬浮电话 */
.float-call{
  position:fixed;right:22px;bottom:28px;z-index:90;width:54px;height:54px;border-radius:50%;
  background:var(--teal);color:var(--deep);display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 30px -8px rgba(25,195,177,.6);transition:transform .25s;
}
.float-call:hover{transform:scale(1.08)}
.float-call svg{width:24px;height:24px}
.float-call::before{
  content:"";position:absolute;inset:-5px;border-radius:50%;border:2px solid rgba(25,195,177,.4);
  animation:ring 2.4s ease-out infinite;
}
@keyframes ring{0%{transform:scale(.9);opacity:1}70%,100%{transform:scale(1.35);opacity:0}}

/* 滚动入场 */
.fade{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.fade.in{opacity:1;transform:none}
.fade[data-d="1"]{transition-delay:.08s}.fade[data-d="2"]{transition-delay:.16s}
.fade[data-d="3"]{transition-delay:.24s}.fade[data-d="4"]{transition-delay:.32s}

/* 通用卡片 */
.card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s;
}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:rgba(25,195,177,.4)}

/* 占位图（等用户发实拍图后替换） */
.ph-img{
  position:relative;overflow:hidden;background:linear-gradient(150deg,#0E2A4A,#12325C 60%,#0B1F3A);
  display:flex;align-items:center;justify-content:center;
}
.ph-img::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(ellipse 60% 40% at 70% 30%,rgba(25,195,177,.12),transparent 70%),
    repeating-linear-gradient(115deg,transparent 0 26px,rgba(245,248,250,.035) 26px 27px);
}
.ph-img svg{width:58%;height:auto;opacity:.9;position:relative}
.ph-img .ph-tag{
  position:absolute;left:12px;bottom:12px;font-family:var(--font-num);font-size:11px;
  letter-spacing:.2em;color:rgba(245,248,250,.45);
}
.ph-img .ph-wave{position:absolute;left:0;right:0;bottom:26%;height:2px;background:rgba(25,195,177,.35)}

/* 表单 */
.f-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.f-field{display:flex;flex-direction:column;gap:8px}
.f-field.full{grid-column:1/-1}
.f-field label{font-size:13px;font-weight:600;color:var(--ink-2);letter-spacing:.04em}
.f-field label i{color:var(--orange);font-style:normal;margin-left:2px}
.f-field input,.f-field textarea,.f-field select{
  border:1px solid var(--line);border-radius:var(--r);padding:12px 14px;font:inherit;
  background:var(--white);color:var(--ink);transition:border-color .2s,box-shadow .2s;width:100%;
}
.f-field input:focus,.f-field textarea:focus,.f-field select:focus{
  outline:none;border-color:var(--teal);box-shadow:0 0 0 3px var(--teal-dim);
}
.f-field textarea{resize:vertical;min-height:120px}
.f-note{font-size:13px;min-height:1.4em;margin-top:4px}
.f-note.ok{color:#0f9e8d;font-weight:600}
.f-note.err{color:#c96a2b}

/* 404 & 通用 */
.empty-tip{
  border:1px dashed var(--line);border-radius:var(--r-lg);padding:44px 24px;text-align:center;
  color:var(--ink-3);font-size:14px;
}

/* 响应式 */
@media (max-width:960px){
  .main-nav,.hdr-tel{display:none}
  .burger{display:block}
  .ft-grid{grid-template-columns:1fr 1fr}
  .f-grid{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .fade{opacity:1;transform:none}
}

/* ---------- 语言切换 ---------- */
.lang-group{display:inline-flex;align-items:center;gap:6px}
.lang-toggle{
  display:inline-flex;align-items:center;gap:4px;
  font-family:system-ui,-apple-system,"Segoe UI",sans-serif;font-size:12.5px;font-weight:700;letter-spacing:.04em;
  color:var(--deep);background:rgba(11,31,58,.06);
  border:1px solid rgba(11,31,58,.28);border-radius:999px;padding:6px 12px;cursor:pointer;transition:all .25s;
  text-decoration:none;
}
.lang-toggle:hover{background:var(--teal);border-color:var(--teal);color:#fff;transform:translateY(-1px)}
.m-lang-group{display:inline-flex;align-items:center;gap:8px;margin:14px 0 4px}
.m-lang{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  font-family:system-ui,-apple-system,"Segoe UI",sans-serif;font-size:14px;font-weight:700;
  letter-spacing:.04em;color:#fff;background:var(--teal);
  border:1px solid var(--teal);border-radius:999px;padding:9px 22px;cursor:pointer;text-decoration:none;
}

/* ============================================================
   移动端适配补丁（≤960 / ≤560）
   ============================================================ */
body{overflow-x:hidden}

@media (max-width:960px){
  /* 页头：只保留 logo + 汉堡，语言切换与 CTA 进全屏菜单 */
  .hdr-right .lang-group,.hdr-cta{display:none}
  .hdr-right{gap:8px}
  .logo-text span{display:none}
  /* 页脚 2 列收为更宽松 */
  .ft-col a{padding:7px 0}
  .sec{padding:clamp(56px,7vh,80px) 0}
  .sec-head{margin-bottom:clamp(32px,4vh,48px)}
  .page-hero{padding:calc(var(--header-h) + clamp(40px,6vh,64px)) 0 clamp(36px,5vh,56px)}
}

@media (max-width:560px){
  .logo-img{width:34px;height:34px}
  .logo-text b{font-size:15px}
  .btn{padding:12px 18px;font-size:14px}
  .btn-line,.btn-teal{white-space:normal}
  .ft-grid{grid-template-columns:1fr;gap:30px}
  .ft-brand p{max-width:none;font-size:13px}
  .ft-brand .logo-text span{display:none}
  /* 三个链接栏目：每栏 2 列排布，行距收紧，整体大幅缩短 */
  .ft-col{display:grid;grid-template-columns:1fr 1fr;gap:2px 18px;align-content:start}
  .ft-col h5{grid-column:1/-1;font-size:12px;margin-bottom:8px;letter-spacing:.14em;
    display:flex;align-items:center;gap:8px}
  .ft-col h5::before{content:"";width:16px;height:2px;background:var(--teal)}
  .ft-col a{display:block;padding:5px 0;font-size:13.5px;white-space:nowrap}
  .ft-bottom{justify-content:flex-start}
  .float-call{width:48px;height:48px;right:14px;bottom:16px}
  .float-call svg{width:20px;height:20px}
  .mnav a{font-size:22px;padding:14px 0}
  .mnav .m-tel{font-size:20px}
  .sec{padding:48px 0}
  .sec-head-row{gap:16px}
  .btn{gap:8px}
  .hero-cta,.cta-actions,.cta-band .wrap{gap:12px}
  .cta-band .wrap{padding-top:40px;padding-bottom:40px}
  .f-field input,.f-field textarea,.f-field select{padding:12px;font-size:15px}
}