/* ============================================================
   执梦科技官网 - 样式文件
   说明：本文件为全站唯一样式源，HTML 仅保留结构与文案。
   ============================================================ */

/* ============ 基础与设计令牌 ============ */
:root{
  --brand-950:#061A3A;
  --brand-800:#0A2A5C;
  --brand-700:#123A7A;
  --brand-600:#1E5BD4;
  --brand-500:#2E6BFF;
  --brand-300:#7FA5F5;
  --brand-100:#E7EEFC;
  --ink-900:#0F1B33;
  --ink-600:#43516E;
  --ink-400:#7C8AA6;
  --bg-soft:#F5F8FD;
  --line:#E3E9F4;
  --white:#FFFFFF;
  --radius:14px;
  --shadow-card:0 10px 30px rgba(10,42,92,.06);
  --container:1160px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--ink-900);
  background:var(--white);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;}
a{text-decoration:none;color:inherit;}
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}
.section{padding:96px 0;}
.section-head{max-width:640px;margin:0 auto 56px;text-align:center;}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:.22em;
  text-transform:uppercase;color:var(--brand-500);margin-bottom:14px;
}
.section-title{font-size:clamp(28px,4vw,40px);font-weight:900;letter-spacing:.02em;line-height:1.3;}
.section-sub{margin-top:16px;color:var(--ink-600);font-size:16px;}

/* ============ 导航 ============ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:linear-gradient(180deg,rgba(6,26,58,.78),rgba(6,26,58,0));
  transition:background .25s ease,box-shadow .25s ease,color .25s ease;
  color:var(--white);
}
.nav.scrolled{
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  color:var(--ink-900);
  box-shadow:0 1px 0 var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;}
.brand{display:flex;align-items:center;}
.brand-logo{height:44px;width:auto;display:block;}
.nav-links{display:flex;align-items:center;gap:36px;font-size:15px;font-weight:500;}
.nav-links a{transition:opacity .2s ease;}
.nav-links a:hover{opacity:.65;}
.nav-phone{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:700;font-size:15px;
  border:1px solid rgba(255,255,255,.4);
  border-radius:999px;padding:9px 20px;
  transition:all .25s ease;
}
.nav.scrolled .nav-phone{border-color:var(--brand-500);color:var(--brand-600);}
.nav-phone:hover{background:var(--brand-500);color:#fff;border-color:var(--brand-500);}
.nav-phone svg{width:15px;height:15px;}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:10px;}
.nav-toggle svg{width:26px;height:26px;}
.nav-toggle line{stroke:currentColor;stroke-width:2;stroke-linecap:round;}

/* ============ Hero ============ */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  background:
    linear-gradient(115deg, rgba(6,26,58,.96) 0%, rgba(10,42,92,.82) 42%, rgba(30,91,212,.35) 100%),
    url("https://aka.doubaocdn.com/s/kRmcfnbto6") center/cover no-repeat;
  color:var(--white);
  overflow:hidden;
}
.hero-inner{position:relative;z-index:2;padding:150px 0 110px;}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;font-weight:700;letter-spacing:.24em;
  color:var(--brand-300);margin-bottom:26px;
}
.hero-eyebrow::before{content:"";width:34px;height:1px;background:var(--brand-300);}
.hero h1{
  font-size:clamp(40px,7vw,68px);font-weight:900;line-height:1.18;letter-spacing:.02em;
  max-width:760px;
}
.hero h1 .accent{background:linear-gradient(90deg,#7FA5F5,#C9DAFF);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero-sub{margin-top:26px;font-size:clamp(16px,2vw,20px);color:#CFDBF4;max-width:560px;}
.hero-cta{margin-top:44px;display:flex;align-items:center;gap:18px;flex-wrap:wrap;}
.btn-primary{
  display:inline-flex;align-items:center;gap:10px;
  background:var(--brand-500);color:#fff;font-weight:700;font-size:16px;
  padding:15px 34px;border-radius:999px;
  transition:background .25s ease,transform .25s ease;
}
.btn-primary:hover{background:var(--brand-600);transform:translateY(-2px);}
.btn-primary svg{width:16px;height:16px;}
.hero-note{font-size:14px;color:#A9BCE0;}
.hero-scroll{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  width:26px;height:42px;border:1.5px solid rgba(255,255,255,.45);border-radius:20px;
}
.hero-scroll::after{
  content:"";position:absolute;top:8px;left:50%;transform:translateX(-50%);
  width:4px;height:8px;border-radius:3px;background:rgba(255,255,255,.7);
  animation:scrollDot 1.8s ease-in-out infinite;
}
@keyframes scrollDot{
  0%{opacity:1;transform:translate(-50%,0);}
  70%{opacity:0;transform:translate(-50%,14px);}
  100%{opacity:0;transform:translate(-50%,0);}
}
@media (prefers-reduced-motion: reduce){
  .hero-scroll::after{animation:none;}
}

/* ============ 核心理念 ============ */
.vision{background:var(--white);}
.vision-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.vision-card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 30px;border-top:3px solid transparent;
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.vision-card:hover{
  transform:translateY(-6px);border-top-color:var(--brand-500);
  box-shadow:var(--shadow-card);
}
.vision-card h3{font-size:20px;font-weight:700;margin-bottom:14px;letter-spacing:.03em;}
.vision-card p{font-size:14.5px;color:var(--ink-600);}

/* ============ 业务范围 ============ */
.business{background:var(--bg-soft);}
.biz-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.biz-item{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:38px 26px;text-align:center;
  transition:transform .25s ease,box-shadow .25s ease;
}
.biz-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-card);}
.biz-icon{
  width:64px;height:64px;margin:0 auto 20px;border-radius:18px;
  background:var(--brand-100);display:flex;align-items:center;justify-content:center;
  color:var(--brand-600);
}
.biz-icon svg{width:30px;height:30px;}
.biz-item h3{font-size:19px;font-weight:700;letter-spacing:.04em;}
.biz-item p{margin-top:10px;font-size:13.5px;color:var(--ink-400);}

/* ============ 页脚 ============ */
.footer{background:var(--brand-950);color:#C9D6EE;}
.footer-top{padding:88px 0 64px;text-align:center;}
.footer-title{
  font-size:clamp(30px,4.5vw,44px);font-weight:900;color:var(--white);
  letter-spacing:.04em;margin-bottom:12px;
}
.footer-sub{font-size:16px;color:#8FA4CC;max-width:480px;margin:0 auto;}
.footer-contact{
  display:flex;justify-content:center;gap:64px;flex-wrap:wrap;
  margin:48px 0 0;
}
.contact-item{display:flex;flex-direction:column;align-items:center;gap:12px;min-width:190px;}
.contact-item .c-icon{
  width:52px;height:52px;border-radius:50%;
  border:1px solid rgba(255,255,255,.18);
  display:flex;align-items:center;justify-content:center;color:var(--brand-300);
}
.contact-item .c-icon svg{width:22px;height:22px;}
.contact-item .c-label{font-size:12px;letter-spacing:.18em;color:#7E93BC;text-transform:uppercase;}
.contact-item .c-value{font-size:16px;font-weight:700;color:var(--white);}
.contact-item a.c-value:hover{color:var(--brand-300);}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:26px 0;font-size:13.5px;color:#7E93BC;text-align:center;
}
.footer-icp{margin-top:10px;display:flex;justify-content:center;align-items:center;gap:14px;flex-wrap:wrap;}
.footer-icp a{transition:color .2s ease;}
.footer-icp a:hover{color:var(--white);}

/* ============ 响应式 ============ */
@media (max-width: 1024px){
  .vision-grid{grid-template-columns:repeat(2,1fr);}
  .biz-grid{grid-template-columns:repeat(2,1fr);}
  .footer-contact{gap:36px;}
}
@media (max-width: 720px){
  .section{padding:68px 0;}
  .nav-toggle{display:block;}
  .brand-logo{height:32px;}
  .nav-links{
    position:fixed;top:72px;left:0;right:0;
    flex-direction:column;gap:0;align-items:stretch;
    background:var(--white);color:var(--ink-900);
    box-shadow:0 12px 30px rgba(10,42,92,.12);
    max-height:0;overflow:hidden;transition:max-height .3s ease;
  }
  .nav-links.open{max-height:340px;}
  .nav-links a{padding:16px 24px;border-bottom:1px solid var(--line);font-size:16px;}
  .nav-phone{margin-left:auto;margin-right:6px;}
  .nav-phone span{display:none;}
  .vision-grid,.biz-grid{grid-template-columns:1fr;}
  .hero-inner{padding:130px 0 100px;}
}