/* ============================================================
   泰工科技 · 首页信任感主题（深蓝商务）v2
   更新：Hero 实景图轮播、实景画廊、6 大主营板块、彩色图标
   ============================================================ */
:root{
  --navy:#0E2A47;
  --navy-2:#0A2238;
  --blue:#1C4F9C;
  --blue-2:#1E4F8F;
  --blue-soft:#EAF1FB;
  --blue-line:#D6E2F2;
  --ink:#0E2A47;
  --muted:#5B6B7E;
  --line:#E6ECF3;
  --bg:#F4F7FB;
  --white:#FFFFFF;
  --accent:#1C4F9C;
  --shadow-sm:0 6px 18px rgba(14,42,71,.06);
  --shadow-md:0 16px 40px rgba(14,42,71,.10);
  --shadow-lg:0 24px 60px rgba(14,42,71,.14);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1200px;
  font-synthesis:none;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 32px}

/* ---------- 页头 ---------- */
.header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid transparent;
  transition:box-shadow .25s ease,border-color .25s ease;
}
.header.scrolled{box-shadow:var(--shadow-sm);border-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px}
.logo-img{width:38px;height:38px;border-radius:9px;object-fit:cover}
.logo .brand{font-size:19px;font-weight:700;color:var(--navy);line-height:1.1}
.logo .brand small{display:block;font-size:11px;font-weight:400;color:#8A98A8;letter-spacing:.5px}
.nav-menu{display:flex;align-items:center;gap:30px}
.nav-menu a{font-size:15px;color:#4A5B6E;font-weight:500;transition:color .2s;position:relative}
.nav-menu a::after{content:"";position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--blue);border-radius:1px;transition:.25s}
.nav-menu a:hover{color:var(--blue)}
.nav-menu a:hover::after{width:100%}
.nav-cta{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--blue);color:#fff;font-weight:600;font-size:15px;
  padding:10px 20px;border-radius:9px;transition:background .2s,transform .2s;
}
.nav-cta:hover{background:#16407f;transform:translateY(-1px)}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.hamburger span{width:24px;height:2px;background:#33485f;border-radius:2px;transition:.25s}
.menu.open{display:flex}

/* ========== Hero —— 实景图背景 ========== */
.hero{
  position:relative;overflow:hidden;
  min-height:620px;display:flex;align-items:center;
  color:#fff;padding:96px 0 80px;
}
.hero-bg{
  position:absolute;inset:0;z-index:0;
}
.hero-slide{
  position:absolute;inset:0;
  background-size:cover;background-position:center 35%;
  opacity:0;transition:opacity 1.2s ease-in-out;
}
.hero-slide.active{opacity:1}
.hero-overlay{
  position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(135deg, rgba(11,37,64,.88) 0%, rgba(14,42,71,.72) 45%, rgba(19,64,110,.50) 100%),
    linear-gradient(180deg, transparent 60%, rgba(10,34,56,.65) 100%);
}
.hero-inner{position:relative;z-index:2}
.hero .eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:2px;
  color:#9DC0EC;background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);
  padding:8px 16px;border-radius:999px;margin-bottom:22px;
}
.hero h1{
  font-size:52px;line-height:1.18;font-weight:800;letter-spacing:-.5px;
  max-width:15em;text-shadow:0 2px 20px rgba(0,0,0,.25);
}
.hero h1 .hl{color:#7FB2F0}
.hero-slogan{margin-top:18px;font-size:20px;font-weight:600;color:#C9D8EC;letter-spacing:1px}
.lead{margin-top:16px;max-width:48em;font-size:17px;color:#B9C7DA;line-height:1.8}
.lead strong{color:#E2EAF4;font-weight:700}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:16px;font-weight:600;padding:14px 30px;border-radius:10px;
  cursor:pointer;border:1px solid transparent;transition:transform .2s,background .2s,box-shadow .2s;
}
.btn-accent{background:#fff;color:var(--blue)}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(0,0,0,.22)}
.btn-ghost{background:rgba(255,255,255,.06);color:#fff;border-color:rgba(255,255,255,.35)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-sm{font-size:14px;padding:10px 22px;border-radius:8px}
.trust{display:flex;flex-wrap:wrap;gap:14px 44px;margin-top:38px;padding-top:26px;border-top:1px solid rgba(255,255,255,.10)}
.trust span{display:inline-flex;align-items:center;gap:10px;font-size:14px;color:#D6E0EC}
.trust span svg{width:20px;height:20px;flex:none;opacity:.9}

/* 轮播指示器 */
.hero-dots{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:10px}
.hero-dots .dot{
  width:36px;height:4px;border-radius:2px;background:rgba(255,255,255,.25);
  cursor:pointer;transition:all .3s;border:0;
}
.hero-dots .dot.active{background:rgba(255,255,255,.85);width:52px}

/* ---------- 通用区块 ---------- */
.section{padding:90px 0}
.section-alt{background:var(--bg)}
.section-head{max-width:760px;margin:0 auto 14px;text-align:center}
.section-head .eyebrow{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;
  color:var(--blue);margin-bottom:12px;
}
.section-head h2{font-size:33px;line-height:1.32;font-weight:800;color:var(--navy);letter-spacing:-.3px}
.section-head .sub{margin-top:12px;font-size:16px;color:var(--muted)}

/* ========== 实景展示画廊（新增） ========== */
.gallery-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:16px;
  margin-top:42px;
}
.gallery-item{
  border-radius:var(--radius);overflow:hidden;
  height:240px;
  background-size:cover;background-position:center;
  position:relative;cursor:pointer;
  transition:transform .35s, box-shadow .35s;
}
.gallery-item:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.gallery-caption{
  position:absolute;left:0;right:0;bottom:0;padding:20px 18px 16px;
  background:linear-gradient(transparent, rgba(10,34,56,.82));
  color:#fff;
}
.gallery-caption strong{display:block;font-size:16px;font-weight:700;margin-bottom:4px}
.gallery-caption span{font-size:13px;color:#B9C7DA}

/* ========== 主营方向（6 卡片，3 列） ========== */
.pillar-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:44px}
.pillar-grid-3{grid-template-columns:repeat(3, 1fr)}
.pillar{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;box-shadow:var(--shadow-sm);
  transition:transform .3s cubic-bezier(.2,.8,.2,1), box-shadow .3s;
  position:relative;overflow:hidden;
}
.pillar::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg, var(--blue), #6FA8E0);
  opacity:0;transition:opacity .3s;
}
.pillar:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.pillar:hover::before{opacity:1}
.pillar-ico{
  width:54px;height:54px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;
  flex-shrink:0;
}
.pillar-ico svg{width:28px;height:28px}
/* 彩色图标背景 */
.pillar-ico.ico-blue   {background:linear-gradient(135deg,#1C4F9C,#2563EB) }
.pillar-ico.ico-teal  {background:linear-gradient(135deg,#0D9488,#14B8A6) }
.pillar-ico.ico-indigo{background:linear-gradient(135deg,#4338CA,#6366F1) }
.pillar-ico.ico-emerald{background:linear-gradient(135deg,#059669,#10B981) }
.pillar-ico.ico-violet{background:linear-gradient(135deg,#7C3AED,#8B5CF6) }
.pillar-ico.ico-amber {background:linear-gradient(135deg,#D97706,#F59E0B) }
.pillar h3{font-size:20px;font-weight:700;color:var(--navy);line-height:1.3}
.pillar-lead{margin-top:8px;font-size:14.5px;color:var(--muted);line-height:1.55}
.pm-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.pm-chips span{
  font-size:12.5px;color:#33517A;background:#EEF3FA;
  padding:6px 13px;border-radius:999px;transition:background .2s,color .2s;
}
.pm-chips span:hover{background:var(--blue-soft);color:var(--blue)}

/* ---------- 客户案例 ---------- */
.case-tabs{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:30px 0 26px}
.case-tabs button{
  font-size:14px;font-weight:600;color:#4A5B6E;background:#fff;
  border:1px solid var(--line);border-radius:999px;padding:9px 20px;cursor:pointer;
  transition:.2s;
}
.case-tabs button:hover{border-color:var(--blue-line)}
.case-tabs button.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.case-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.case-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .3s,box-shadow .3s;
}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.case-card.hidden{display:none}
.case-card .thumb{
  height:210px;background-size:cover;background-position:center;position:relative;
}
.case-card .thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(14,42,71,0) 40%,rgba(14,42,71,.28))}
.case-card .badge{
  position:absolute;left:16px;top:16px;z-index:2;
  font-size:12px;font-weight:700;color:#fff;background:rgba(28,79,156,.92);
  padding:5px 14px;border-radius:999px;
}
.case-card .body{padding:22px 24px}
.case-card .body h4{font-size:18.5px;font-weight:700;color:var(--navy)}
.case-card .body p{margin-top:10px;font-size:14px;color:var(--muted);line-height:1.72}

/* ---------- 为什么选我们（深色） ---------- */
#why{background:var(--navy);color:#fff}
#why .section-head .eyebrow{color:#6FA8E0}
#why .section-head h2{color:#fff}
#why .section-head .sub{color:#B9C7DA}
.adv-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:44px}
.adv-card{
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.10);
  border-radius:14px;padding:28px;transition:transform .3s,background .3s;
}
.adv-card:hover{transform:translateY(-5px);background:rgba(255,255,255,.07)}
.adv-ico{
  width:48px;height:48px;border-radius:13px;background:var(--blue-2);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.adv-ico svg{width:26px;height:26px}
.adv-card h3{font-size:18px;font-weight:700}
.adv-card p{margin-top:8px;font-size:14px;color:#B9C7DA;line-height:1.68}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:50px;
  padding-top:42px;border-top:1px solid rgba(255,255,255,.10)}
.stat{text-align:center}
.stat .num{font-size:42px;font-weight:800;color:#6FA8E0;line-height:1}
.stat .label{margin-top:8px;font-size:14px;color:#9FB4CC}

/* ---------- 服务流程 ---------- */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:44px}
.step{
  background:var(--bg);border:1px solid var(--line);border-radius:14px;
  padding:28px 24px;position:relative;transition:transform .3s,box-shadow .3s;
}
.step:hover{transform:translateY(-5px);box-shadow:var(--shadow-sm)}
.step-no{font-size:40px;font-weight:800;color:var(--blue);line-height:1;opacity:.75}
.step h4{margin-top:12px;font-size:17.5px;font-weight:700;color:var(--navy)}
.step p{margin-top:8px;font-size:14px;color:var(--muted);line-height:1.65}

/* ---------- 联系我们 ---------- */
.inquiry-grid{display:grid;grid-template-columns:420px 1fr;gap:32px;margin-top:44px;align-items:start}
.inquiry-info{
  background:var(--navy);color:#fff;border-radius:var(--radius);padding:38px;
}
.inquiry-info h3{font-size:21px;font-weight:700}
.info-list{list-style:none;margin-top:24px;display:grid;gap:18px}
.info-list li{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:#E2EAF4}
.info-list li span{flex:none;color:#9DC0EC;font-weight:600;min-width:56px}
.info-list a{color:#fff;font-weight:600}
.inquiry-form{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:36px;box-shadow:var(--shadow-sm);display:grid;gap:18px;
}
.inquiry-form .field{display:grid;gap:8px}
.inquiry-form .field.two{grid-template-columns:1fr 1fr;gap:16px}
.inquiry-form label{font-size:14px;font-weight:600;color:var(--navy)}
.inquiry-form input,.inquiry-form select,.inquiry-form textarea{
  width:100%;font-size:15px;font-family:inherit;color:var(--ink);
  background:var(--bg);border:1px solid var(--line);border-radius:10px;
  padding:13px 15px;outline:none;transition:border-color .2s,box-shadow .2s;resize:vertical;
}
.inquiry-form input:focus,.inquiry-form select:focus,.inquiry-form textarea:focus{
  border-color:var(--blue);box-shadow:0 0 0 3px rgba(28,79,156,.12);
}
.inquiry-form .btn-block{width:100%;margin-top:4px;background:var(--blue);color:#fff;border:0;padding:15px;font-size:16px}
.inquiry-form .btn-block:hover{background:#16407f;transform:translateY(-1px)}
.form-ok{color:#1f9d6b;font-weight:700}

/* ---------- 页脚 ---------- */
.footer{background:var(--navy-2);color:#B9C7DA;padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.footer .f-logo-img{width:34px;height:34px;border-radius:8px}
.footer .f-slogan{margin-top:14px;font-size:16px;font-weight:700;color:#fff}
.footer .f-desc{margin-top:10px;font-size:14px;line-height:1.7;max-width:30em}
.footer h4{font-size:13px;font-weight:700;color:#6FA8E0;letter-spacing:1px;margin-bottom:4px}
.f-links{list-style:none;display:grid;gap:12px;margin-top:14px}
.f-links a{font-size:14px;color:#B9C7DA;transition:color .2s}
.f-links a:hover{color:#fff}
.f-bottom{margin-top:44px;padding-top:24px;border-top:1px solid rgba(255,255,255,.08);
  font-size:13px;color:#7E92A8;text-align:center}

/* ---------- 悬浮侧栏 ---------- */
.float-side{position:fixed;right:22px;bottom:90px;z-index:60;display:flex;flex-direction:column;gap:12px}
.float-side a{
  width:48px;height:48px;border-radius:12px;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);
  transition:transform .2s,background .2s;
}
.float-side a:hover{transform:translateY(-2px);background:#16407f}
.float-side a svg{width:22px;height:22px}
.float-side a[href="#top"]{background:#0E2A47}

/* ---------- 入场动画 ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .65s ease,transform .65s ease}
.reveal.in-view{opacity:1;transform:none}
.hidden{display:none}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .gallery-grid{grid-template-columns:repeat(2,1fr)}
  .pillar-grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:980px){
  .pillar-grid,.case-grid,.adv-grid,.flow{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr);gap:28px 20px}
  .inquiry-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:42px}
}
@media (max-width:680px){
  .container{padding:0 20px}
  .nav-menu{
    position:absolute;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;
    gap:0;background:#fff;padding:8px 20px 16px;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-sm);display:none;
  }
  .nav-menu a{padding:14px 4px;border-bottom:1px solid var(--line)}
  .hamburger{display:flex}
  .nav-cta{display:none}
  .hero{min-height:520px;padding:70px 0 56px}
  .hero h1{font-size:32px}
  .hero-slogan{font-size:17px}
  .lead{font-size:15px}
  .section{padding:60px 0}
  .section-head h2{font-size:25px}
  .pillar-grid,.case-grid,.adv-grid,.flow,.stats,  .gallery-grid{grid-template-columns:1fr}
  .pillar-grid-3{grid-template-columns:1fr}
  .inquiry-form .field.two{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .trust{gap:12px 24px}
  .hero-actions .btn-sm{display:none}
}