/* =========================================================
   安信恒节能网站 · 子页共享样式（与主页 index.html 同风格）
   ========================================================= */
:root{
  --bg:#070b13;
  --bg2:#0a111c;
  --panel:#0e1725;
  --panel2:#0b1320;
  --line:rgba(133,166,214,.14);
  --line2:rgba(133,166,214,.26);
  --txt:#e9f0fb;
  --txt2:#93a6c4;
  --txt3:#5f7392;
  --cyan:#3FC8FF;
  --amber:#FFA53D;
  --red:#FF5B5B;
  --green:#3DDC84;
  --mono:"SF Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--txt);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
  overflow-x:hidden;
}
a{color:inherit}
button{font-family:inherit}
::selection{background:rgba(63,200,255,.28)}

/* ---------- 背景 ---------- */
.bg-fx{position:fixed;inset:0;z-index:-2;pointer-events:none;overflow:hidden}
.bg-fx::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(900px 620px at 74% 6%, rgba(31,105,160,.22), transparent 65%),
    radial-gradient(760px 520px at 12% 26%, rgba(255,165,61,.075), transparent 68%),
    radial-gradient(900px 700px at 50% 100%, rgba(20,65,105,.16), transparent 70%);
}
.bg-grid{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(120,160,215,.065) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,160,215,.065) 1px, transparent 1px);
  background-size:70px 70px;
  mask-image:radial-gradient(ellipse 90% 65% at 50% 22%, #000 10%, transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 90% 65% at 50% 22%, #000 10%, transparent 78%);
  opacity:.7;
}

/* ---------- 导航（与主页一致） ---------- */
.nav{
  position:sticky;top:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:12px clamp(18px,4vw,54px);
  background:rgba(7,11,19,.74);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(120,160,215,.10);
}
.nav-brand{display:flex;align-items:center;gap:11px;text-decoration:none;min-width:0}
.nav-brand img{height:30px;width:auto;display:block;filter:drop-shadow(0 0 9px rgba(63,200,255,.35))}
.nav-word{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.nav-word b{font-size:16.5px;letter-spacing:.22em;font-weight:700;white-space:nowrap}
.nav-word span{font-size:8.5px;letter-spacing:.24em;color:var(--txt3);font-family:var(--mono);margin-top:2px;white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav-links a{
  text-decoration:none;font-size:12.5px;color:var(--txt2);letter-spacing:.04em;
  position:relative;padding:6px 0;transition:color .2s;
}
.nav-links a:hover{color:var(--txt)}
.nav-links a.active{color:var(--txt)}
.nav-links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--cyan);
  transition:right .25s ease;
}
.nav-links a:hover::after{right:0}
.nav-links a.active::after{right:0}
.nav-cta{
  text-decoration:none;font-size:12px;font-weight:600;letter-spacing:.04em;
  color:#1c1204;background:var(--amber);border-radius:8px;padding:8px 15px;
  transition:transform .2s,box-shadow .2s,filter .2s;
  box-shadow:0 4px 18px -6px rgba(255,165,61,.55);
}
.nav-cta:hover{transform:translateY(-1px);filter:brightness(1.06);box-shadow:0 8px 24px -6px rgba(255,165,61,.6)}

/* ---------- 页面容器 ---------- */
.page{
  max-width:1180px;margin:0 auto;
  padding:clamp(40px,5.5vw,72px) clamp(18px,4vw,54px) clamp(48px,6vw,80px);
}
.subhero{max-width:760px;margin-bottom:clamp(30px,4.5vw,52px)}
.eyebrow{
  display:flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.22em;color:var(--cyan);
  text-transform:uppercase;margin-bottom:18px;
}
.eyebrow::before{content:"";width:28px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}
.subhero h1{
  font-size:clamp(30px,3.6vw,48px);line-height:1.18;letter-spacing:-.022em;font-weight:650;
  margin-bottom:16px;
}
.subhero .lead{font-size:clamp(13px,1.1vw,15px);line-height:1.9;color:var(--txt2);max-width:640px}
.subhero .lead b{color:#DCE8F8;font-weight:600}

/* ---------- 区块 ---------- */
.block{margin-top:clamp(38px,5vw,60px)}
.block h2{
  font-size:clamp(20px,2.1vw,28px);line-height:1.3;letter-spacing:-.015em;font-weight:640;
  margin-bottom:18px;display:flex;align-items:center;gap:11px;
}
.block h2 .bar{width:4px;height:1.1em;border-radius:2px;background:linear-gradient(180deg,var(--cyan),var(--amber));flex:none}
.block > p{font-size:13px;line-height:1.9;color:var(--txt2);max-width:720px}
.block > p + p{margin-top:10px}
.muted{color:var(--txt3)}
.fine{font-size:10.5px;color:var(--txt3);line-height:1.7;letter-spacing:.02em}

/* ---------- 卡片网格 ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}
.cat-grid.cols2{grid-template-columns:repeat(2,minmax(0,1fr))}
.cat-grid.cols3{grid-template-columns:repeat(3,minmax(0,1fr))}
.cat-card,.feat{
  background:linear-gradient(160deg,rgba(17,28,45,.9),rgba(9,15,25,.9));
  border:1px solid var(--line);border-radius:15px;padding:19px 19px 17px;
  transition:transform .3s,border-color .3s,box-shadow .3s;
}
.cat-card{display:flex;flex-direction:column;text-decoration:none;color:inherit;position:relative;overflow:hidden}
.cat-card::after{
  content:"";position:absolute;inset:0;border-radius:15px;pointer-events:none;
  background:radial-gradient(280px 150px at 12% 0%,rgba(63,200,255,.06),transparent 72%);
  opacity:0;transition:opacity .35s;
}
.cat-card:hover{transform:translateY(-4px);border-color:rgba(63,200,255,.32);box-shadow:0 24px 50px -32px rgba(0,0,0,.9)}
.cat-card:hover::after{opacity:1}
.cat-card .ci{
  width:40px;height:40px;border-radius:10px;display:grid;place-items:center;margin-bottom:13px;
  color:#9FE8FF;background:rgba(63,200,255,.08);border:1px solid rgba(63,200,255,.2);
}
.cat-card h3,.feat h3{font-size:15.5px;font-weight:640;letter-spacing:-.01em;margin-bottom:7px}
.cat-card p,.feat p{font-size:11.8px;line-height:1.75;color:var(--txt2)}
.cat-card p b,.feat p b{color:#CFE2F4;font-weight:600}
.cat-card .more{margin-top:auto;padding-top:13px;font-size:11px;font-weight:600;color:#8FD9FF;letter-spacing:.03em}

/* ---------- 表格 ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:13px;background:rgba(10,17,28,.5)}
.dtable{width:100%;border-collapse:collapse;font-size:12px;min-width:640px}
.dtable th,.dtable td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
.dtable th{
  font-size:10.5px;letter-spacing:.08em;color:var(--txt3);font-weight:600;
  background:rgba(14,23,37,.85);
}
.dtable td{color:var(--txt2)}
.dtable td:first-child{color:var(--txt);font-weight:600}
.dtable td b{color:#FFC98A;font-weight:700;font-variant-numeric:tabular-nums}
.dtable tbody tr:last-child td{border-bottom:none}
.dtable tbody tr{transition:background .2s}
.dtable tbody tr:hover{background:rgba(63,200,255,.04)}

/* ---------- 提示条 ---------- */
.note{
  font-size:12px;line-height:1.8;color:var(--txt2);
  background:rgba(63,200,255,.05);border:1px solid rgba(63,200,255,.16);
  border-radius:11px;padding:13px 16px;margin-top:16px;
}
.note b{color:var(--txt);font-weight:600}
.note.warn{background:rgba(255,165,61,.06);border-color:rgba(255,165,61,.2)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;text-decoration:none;cursor:pointer;
  font-size:12.5px;font-weight:600;letter-spacing:.03em;border-radius:9px;padding:11px 19px;
  transition:transform .2s,filter .2s,box-shadow .2s,border-color .2s,color .2s,background .2s;
  border:1px solid transparent;
}
.btn-primary{
  color:#1b1204;background:var(--amber);
  box-shadow:0 8px 26px -10px rgba(255,165,61,.75);
}
.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.06);box-shadow:0 14px 32px -12px rgba(255,165,61,.85)}
.btn-ghost{
  color:var(--txt2);border-color:var(--line2);background:rgba(16,26,42,.5);
}
.btn-ghost:hover{color:var(--txt);border-color:rgba(63,200,255,.45);background:rgba(20,34,54,.6)}

/* ---------- 合作模式卡 ---------- */
.model-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.model-card{
  position:relative;
  background:linear-gradient(160deg,rgba(17,28,45,.92),rgba(8,14,24,.94));
  border:1px solid var(--line);border-radius:17px;padding:24px 24px 21px;
  transition:transform .3s,border-color .3s,box-shadow .3s;
}
.model-card:hover{transform:translateY(-4px);box-shadow:0 24px 54px -32px rgba(0,0,0,.9)}
.model-card.feature{border-color:rgba(255,165,61,.32)}
.model-card .ribbon{
  position:absolute;top:-1px;right:20px;
  font-size:10px;font-weight:700;letter-spacing:.08em;color:#241505;
  background:linear-gradient(90deg,#FFC46B,var(--amber));
  padding:5px 11px;border-radius:0 0 8px 8px;
  box-shadow:0 6px 18px -6px rgba(255,165,61,.6);
}
.model-card h3{font-size:19px;font-weight:650;letter-spacing:-.015em;margin-bottom:7px}
.model-card .sub{font-size:12px;line-height:1.75;color:var(--txt2);margin-bottom:15px}
.model-card ul{list-style:none;display:flex;flex-direction:column;gap:9px;margin-bottom:17px}
.model-card li{display:flex;gap:9px;align-items:flex-start;font-size:12px;line-height:1.7;color:var(--txt2)}
.model-card li svg{flex:none;margin-top:3px;color:var(--green)}
.model-card .price{
  font-size:11.5px;color:var(--txt3);border-top:1px dashed var(--line2);padding-top:13px;
}
.model-card .price b{color:#FFC98A;font-family:var(--mono);font-size:13px}

/* ---------- 双交付 ---------- */
.fit-box{
  background:linear-gradient(160deg,rgba(63,200,255,.07),rgba(9,15,25,.6));
  border:1px solid rgba(63,200,255,.2);border-radius:15px;padding:22px 24px;
}
.fit-box .lab{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;color:var(--cyan);
  margin-bottom:10px;text-transform:uppercase;
}
.fit-box h3{font-size:19px;font-weight:650;letter-spacing:-.01em;margin-bottom:9px}
.fit-box p{font-size:12.5px;line-height:1.85;color:var(--txt2);max-width:680px}
.fit-box p b{color:#CFE7F8;font-weight:600}

/* ---------- 流程步骤 ---------- */
.flow-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:11px;counter-reset:fs}
.fstep{
  position:relative;background:var(--panel);border:1px solid var(--line);border-radius:13px;
  padding:16px 15px 14px;counter-increment:fs;
  transition:transform .25s,border-color .25s;
}
.fstep:hover{transform:translateY(-3px);border-color:rgba(63,200,255,.3)}
.fstep .n::before{
  content:"0" counter(fs);display:inline-block;
  font-family:var(--mono);font-size:10.5px;font-weight:700;color:#9FE8FF;
  background:rgba(63,200,255,.08);border:1px solid rgba(63,200,255,.2);
  border-radius:7px;padding:3px 8px;margin-bottom:10px;
}
.fstep h4{font-size:13.5px;font-weight:640;margin-bottom:5px}
.fstep p{font-size:11px;line-height:1.65;color:var(--txt3)}

/* ---------- 联系页 ---------- */
.contact-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:20px;align-items:start}
.contact-info h2{font-size:clamp(20px,2.1vw,28px);font-weight:640;letter-spacing:-.015em;margin-bottom:10px}
.contact-info > p{font-size:13px;line-height:1.85;color:var(--txt2);max-width:480px;margin-bottom:22px}
.contact-list{display:flex;flex-direction:column;gap:11px}
.contact-item{
  display:flex;align-items:center;gap:14px;
  background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:15px 17px;
  transition:border-color .25s,transform .25s;
}
.contact-item:hover{border-color:rgba(63,200,255,.3);transform:translateX(3px)}
.contact-item .ic{
  width:40px;height:40px;border-radius:10px;display:grid;place-items:center;flex:none;
  color:#9FE8FF;background:rgba(63,200,255,.08);border:1px solid rgba(63,200,255,.2);
}
.contact-item b{display:block;font-size:13.5px;font-weight:640;margin-bottom:2px}
.contact-item span{display:block;font-size:12px;color:var(--txt2);line-height:1.55}
.contact-form{
  background:linear-gradient(160deg,rgba(17,28,45,.92),rgba(8,14,24,.94));
  border:1px solid var(--line);border-radius:17px;padding:24px 24px 20px;
  box-shadow:0 30px 70px -40px rgba(0,0,0,.9);
}
.contact-form h3{font-size:17px;font-weight:640;margin-bottom:17px}
.field{margin-bottom:14px}
.field label{display:block;font-size:11.5px;color:var(--txt2);margin-bottom:6px;letter-spacing:.03em}
.field input,.field textarea{
  width:100%;background:#0a1320;border:1px solid var(--line2);border-radius:9px;
  padding:10px 13px;font-size:12.5px;color:var(--txt);font-family:inherit;
  outline:none;transition:border-color .2s,box-shadow .2s;
}
.field input:focus,.field textarea:focus{
  border-color:var(--cyan);box-shadow:0 0 0 3px rgba(63,200,255,.12);
}
.field textarea{min-height:96px;resize:vertical}
.field input::placeholder,.field textarea::placeholder{color:var(--txt3)}
.contact-form .hint{font-size:10.5px;color:var(--txt3);line-height:1.65;margin-top:11px;text-align:center}
.contact-form .ok{
  display:none;font-size:12px;color:#7EE8B1;background:rgba(61,220,132,.08);
  border:1px solid rgba(61,220,132,.25);border-radius:9px;padding:10px 13px;margin-top:12px;
  text-align:center;
}

/* ---------- 尾部（与主页一致） ---------- */
.footer{
  max-width:1440px;margin:0 auto;padding:36px clamp(18px,4vw,54px) 54px;
  border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;
  align-items:flex-start;
}
.foot-brand{display:flex;align-items:flex-start;gap:11px}
.foot-brand img{height:30px;width:auto;opacity:.9}
.foot-brand b{display:block;font-size:14px;letter-spacing:.18em}
.foot-brand span{display:block;font-size:9px;color:var(--txt3);letter-spacing:.2em;margin-top:5px;font-family:var(--mono)}
.foot-links{display:flex;gap:22px;flex-wrap:wrap;align-items:flex-start;font-size:11.5px}
.foot-links a{text-decoration:none;color:var(--txt3);transition:color .2s}
.foot-links a:hover{color:var(--cyan)}
.foot-note{max-width:520px;font-size:9.8px;line-height:1.8;color:var(--txt3);text-align:right}
.foot-note span{display:block;margin-bottom:4px;color:#6F86A6;font-family:var(--mono);letter-spacing:.08em}

/* ---------- 滚动出现 ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .75s cubic-bezier(.2,.7,.2,1),transform .75s cubic-bezier(.2,.7,.2,1);transition-delay:var(--d,0s)}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .cat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .model-grid,.contact-grid{grid-template-columns:1fr}
  .flow-steps{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:760px){
  .nav-links{display:none}
  .nav-word span{display:none}
  .cat-grid,.cat-grid.cols2,.cat-grid.cols3{grid-template-columns:1fr}
  .flow-steps{grid-template-columns:1fr 1fr}
  .foot-note{text-align:left}
  .contact-form{padding:19px 17px 16px}
}
@media (max-width:430px){
  .flow-steps{grid-template-columns:1fr}
  .nav-word b{font-size:15px;letter-spacing:.16em}
  .nav-cta{padding:7px 12px;font-size:11px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}