/* =========================================================
   苏州杜科 官网 · 共享样式系统
   设计基调：深空灰 / 炭黑(深) + 水蓝强调 + 浅色区块(浅)
   深浅搭配：暗色沉浸式首屏/数据带/页脚，亮白区块承载正文阅读
   ========================================================= */
:root{
  /* 深色 */
  --bg:#0A0E16;
  --bg-2:#0D1524;
  --panel:#111C30;
  --panel-2:#15233C;
  --line:rgba(150,170,200,0.16);
  --line-strong:rgba(150,170,200,0.30);
  --text:#EAF1F8;
  --muted:#9FB1C7;
  --silver:#B9C6D6;
  /* 浅色 */
  --light:#FFFFFF;
  --light-2:#F3F7FB;
  --light-3:#E7F0F9;
  --ink:#15202E;
  --ink-2:#3A4858;
  --ink-3:#65748A;
  /* 品牌色 */
  --accent:#1E8FC4;
  --accent-2:#0C6FB0;
  --accent-deep:#0C447C;
  --glow:rgba(30,143,196,0.45);
  --radius:14px;
  --maxw:1240px;
  --nav-h:74px;
  --font:"Source Han Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.eyebrow{font-size:13px;letter-spacing:.32em;color:var(--accent);text-transform:uppercase;font-weight:600;margin-bottom:14px;display:inline-flex;align-items:center;gap:10px;}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--accent);display:inline-block;}
h2.title{font-size:clamp(26px,3.4vw,42px);font-weight:800;letter-spacing:.02em;line-height:1.25;}
.sub{color:var(--muted);max-width:660px;margin-top:14px;font-size:16px;}
section{padding:clamp(64px,9vw,116px) 0;position:relative;}

/* ---------- 区块深浅 ---------- */
.section-dark{background:var(--bg);color:var(--text);}
.section-dark-2{background:var(--bg-2);color:var(--text);}
.section-light{background:var(--light-2);color:var(--ink);}
.section-light .sub{color:var(--ink-3);}
.section-light .eyebrow{color:var(--accent-2);}
.section-light .eyebrow::before{background:var(--accent-2);}
.section-white{background:var(--light);color:var(--ink);}
.section-white .sub{color:var(--ink-3);}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:15px;padding:14px 28px;border-radius:999px;transition:.28s;cursor:pointer;border:1px solid transparent;}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;box-shadow:0 10px 30px rgba(30,143,196,0.32);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(30,143,196,0.45);}
.btn-ghost{border-color:var(--line-strong);color:var(--text);}
.btn-ghost:hover{background:rgba(255,255,255,0.06);border-color:var(--accent);}
.btn-light{background:var(--accent);color:#fff;}
.btn-light:hover{background:var(--accent-2);transform:translateY(-2px);}
.btn-outline-dark{border:1px solid var(--line-strong);color:var(--ink);}
.btn-outline-dark:hover{background:var(--light-3);border-color:var(--accent);color:var(--accent-2);}

/* ---------- 导航 ---------- */
header.nav{position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:100;display:flex;align-items:center;background:linear-gradient(180deg,rgba(10,14,22,0.92),rgba(10,14,22,0.5));backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:background .3s,border-color .3s;}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;width:100%;}
.brand{display:flex;align-items:center;gap:12px;}
.brand .drop{width:30px;height:30px;flex:0 0 auto;filter:drop-shadow(0 0 8px var(--glow));}
.brand .name{font-weight:800;font-size:clamp(14px,1.6vw,18px);letter-spacing:.04em;line-height:1.1;white-space:nowrap;}
.brand .name .hl{color:var(--accent);text-shadow:0 0 14px var(--glow);}
.brand .name .suffix{font-weight:500;color:var(--silver);font-size:.72em;letter-spacing:.18em;display:block;margin-top:2px;}
.nav-links{display:flex;align-items:center;gap:30px;}
.nav-links a{font-size:15px;color:var(--muted);font-weight:500;position:relative;transition:color .25s;}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--accent);transition:width .25s;}
.nav-links a:hover,.nav-links a.active{color:var(--text);}
.nav-links a:hover::after,.nav-links a.active::after{width:100%;}
.nav-phone{display:inline-flex;align-items:center;gap:8px;font-weight:700;color:var(--accent);font-size:15px;border:1px solid var(--line-strong);padding:8px 16px;border-radius:999px;transition:.25s;}
.nav-phone:hover{background:rgba(30,143,196,0.12);border-color:var(--accent);}
.burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;}
.burger span{width:24px;height:2px;background:var(--text);transition:.3s;}

/* ---------- 首页 HERO ---------- */
.hero{min-height:100vh;position:relative;display:flex;align-items:center;padding-top:var(--nav-h);overflow:hidden;background:#070B12;}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;z-index:0;}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(105deg,rgba(7,11,18,0.92) 0%,rgba(7,11,18,0.65) 45%,rgba(12,68,124,0.45) 100%);}
.hero-canvas{position:absolute;inset:0;z-index:1;pointer-events:none;}
.hero .wrap{position:relative;z-index:2;width:100%;}
.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:center;}
.hero-tag{display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.2em;color:#cdeafb;border:1px solid rgba(30,143,196,0.5);padding:7px 16px;border-radius:999px;background:rgba(30,143,196,0.10);margin-bottom:26px;}
.hero h1{font-size:clamp(30px,4.4vw,56px);font-weight:800;line-height:1.2;letter-spacing:.01em;text-shadow:0 4px 30px rgba(0,0,0,0.5);}
.hero h1 .em{color:#5cc6f0;text-shadow:0 0 26px var(--glow);}
.hero .lead{margin-top:22px;font-size:clamp(15px,1.5vw,19px);color:#d6e4f1;max-width:560px;}
.hero .pillars{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;}
.hero .pillars span{font-size:13px;color:var(--silver);border:1px solid rgba(150,170,200,0.25);padding:6px 14px;border-radius:999px;background:rgba(255,255,255,0.04);}
.hero-cta{display:flex;gap:16px;margin-top:38px;flex-wrap:wrap;}
.hero-figure{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line-strong);box-shadow:0 30px 70px rgba(0,0,0,0.5);}
.hero-figure img{width:100%;height:380px;object-fit:cover;}
.hero-figure .cap{position:absolute;left:0;right:0;bottom:0;padding:14px 18px;background:linear-gradient(0deg,rgba(7,11,18,0.9),transparent);font-size:13px;color:var(--silver);}
.scroll-hint{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);z-index:3;color:var(--muted);font-size:12px;letter-spacing:.2em;text-align:center;}
.scroll-hint .dot{width:22px;height:34px;border:1px solid var(--line-strong);border-radius:12px;margin:0 auto 8px;position:relative;}
.scroll-hint .dot::after{content:"";position:absolute;left:50%;top:7px;width:3px;height:7px;border-radius:2px;background:var(--accent);transform:translateX(-50%);animation:scrolldot 1.6s infinite;}
@keyframes scrolldot{0%{opacity:0;top:7px}40%{opacity:1}80%{opacity:0;top:18px}100%{opacity:0}}

/* ---------- 内页页头 ---------- */
.page-hero{position:relative;padding:calc(var(--nav-h) + 70px) 0 70px;overflow:hidden;background:#070B12;}
.page-hero .hero-bg{background-size:cover;background-position:center;}
.page-hero .hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(7,11,18,0.94),rgba(12,68,124,0.55));}
.page-hero .wrap{position:relative;z-index:2;}
.page-hero h1{font-size:clamp(30px,4vw,50px);font-weight:800;line-height:1.2;}
.page-hero .lead{margin-top:16px;font-size:17px;color:#d6e4f1;max-width:660px;}
.breadcrumb{display:flex;gap:10px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:18px;}
.breadcrumb a:hover{color:var(--accent);}
.breadcrumb .sep{opacity:.5;}

/* ---------- 四大能力 ---------- */
.cap-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:48px;}
.cap-card{background:var(--light);border:1px solid #E2EAF2;border-radius:var(--radius);padding:30px 24px;transition:.3s;position:relative;overflow:hidden;box-shadow:0 8px 24px rgba(20,40,70,0.05);}
.cap-card::before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:linear-gradient(90deg,var(--accent),transparent);opacity:0;transition:.3s;}
.cap-card:hover{transform:translateY(-6px);box-shadow:0 20px 44px rgba(20,40,70,0.12);}
.cap-card:hover::before{opacity:1;}
.cap-ico{width:54px;height:54px;display:flex;align-items:center;justify-content:center;border-radius:12px;background:var(--light-3);border:1px solid #D5E4F2;margin-bottom:18px;}
.cap-ico svg{width:30px;height:30px;}
.cap-card h3{font-size:19px;font-weight:700;margin-bottom:8px;color:var(--ink);}
.cap-card p{font-size:14px;color:var(--ink-3);}
.cap-card .cert{margin-top:14px;font-size:11.5px;color:var(--ink-3);opacity:.8;letter-spacing:.04em;}

/* ---------- 场景方案(深色卡片) ---------- */
.sol-scroll{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(300px,1fr);gap:22px;margin-top:48px;overflow-x:auto;padding-bottom:14px;scroll-snap-type:x mandatory;}
.sol-scroll::-webkit-scrollbar{height:8px;}
.sol-scroll::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:4px;}
.sol-card{scroll-snap-align:start;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;min-height:380px;display:flex;flex-direction:column;}
.sol-card:hover{transform:translateY(-6px);border-color:var(--accent);box-shadow:0 20px 50px rgba(0,0,0,0.45);}
.sol-img{height:190px;position:relative;overflow:hidden;border-bottom:1px solid var(--line);}
.sol-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.sol-card:hover .sol-img img{transform:scale(1.07);}
.sol-body{padding:22px 22px 26px;display:flex;flex-direction:column;flex:1;}
.sol-body .tag{font-size:12px;color:#5cc6f0;letter-spacing:.12em;font-weight:600;}
.sol-body h3{font-size:20px;font-weight:700;margin:8px 0 10px;}
.sol-body p{font-size:14px;color:var(--muted);flex:1;}
.sol-body .more{margin-top:16px;font-size:14px;font-weight:600;color:var(--text);display:inline-flex;align-items:center;gap:8px;transition:.25s;}
.sol-body .more:hover{color:#5cc6f0;gap:12px;}

/* 方案网格(内页用) */
.sol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px;}
.sol-tile{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;}
.sol-tile:hover{transform:translateY(-6px);border-color:var(--accent);box-shadow:0 20px 50px rgba(0,0,0,0.45);}
.sol-tile .sol-img{height:200px;}
.sol-tile .sol-body{padding:24px;}

/* ---------- 数据带 ---------- */
#data,.data-band{background:linear-gradient(90deg,var(--accent-deep),#0a2c52);position:relative;overflow:hidden;}
.data-band::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 80% 50%,rgba(30,143,196,0.3),transparent);}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;position:relative;z-index:1;}
.data-item{text-align:center;}
.data-item .num{font-size:clamp(34px,4vw,56px);font-weight:800;color:#fff;line-height:1;letter-spacing:.01em;}
.data-item .num .unit{font-size:.5em;margin-left:4px;color:#7fd4f5;}
.data-item .label{margin-top:12px;color:rgba(255,255,255,0.85);font-size:14px;letter-spacing:.06em;}

/* ---------- 优势图文(浅色) ---------- */
.adv-row{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;margin-top:64px;}
.adv-row:first-of-type{margin-top:48px;}
.adv-row.reverse .adv-img{order:2;}
.adv-img{height:320px;border-radius:var(--radius);overflow:hidden;border:1px solid #E2EAF2;box-shadow:0 16px 40px rgba(20,40,70,0.10);}
.adv-img img{width:100%;height:100%;object-fit:cover;}
.adv-text h3{font-size:clamp(22px,2.6vw,30px);font-weight:800;margin-bottom:16px;color:var(--ink);}
.adv-text>p{color:var(--ink-3);font-size:15.5px;}
.adv-text ul{list-style:none;margin-top:18px;display:flex;flex-direction:column;gap:12px;}
.adv-text li{display:flex;gap:12px;align-items:flex-start;font-size:14.5px;color:var(--ink-2);}
.adv-text li svg{width:20px;height:20px;flex:0 0 auto;margin-top:3px;}

/* ---------- 设备线卡片(浅色网格) ---------- */
.eq-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px;}
.eq-card{background:var(--light);border:1px solid #E2EAF2;border-radius:var(--radius);overflow:hidden;transition:.3s;box-shadow:0 8px 24px rgba(20,40,70,0.05);}
.eq-card:hover{transform:translateY(-6px);box-shadow:0 20px 44px rgba(20,40,70,0.12);}
.eq-card .eq-img{height:210px;overflow:hidden;}
.eq-card .eq-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.eq-card:hover .eq-img img{transform:scale(1.06);}
.eq-card .eq-body{padding:22px 22px 26px;}
.eq-card h3{font-size:19px;font-weight:700;color:var(--ink);margin-bottom:8px;}
.eq-card p{font-size:14px;color:var(--ink-3);}
.eq-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.eq-tags span{font-size:12px;color:var(--accent-2);background:var(--light-3);border:1px solid #D5E4F2;padding:4px 12px;border-radius:999px;}

/* ---------- 服务矩阵(浅色) ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:48px;}
.svc-card{background:var(--light);border:1px solid #E2EAF2;border-radius:var(--radius);padding:28px 24px;transition:.3s;box-shadow:0 8px 24px rgba(20,40,70,0.05);}
.svc-card:hover{transform:translateY(-5px);box-shadow:0 18px 40px rgba(20,40,70,0.12);border-color:var(--accent);}
.svc-card .svc-ico{width:50px;height:50px;border-radius:12px;background:var(--light-3);display:flex;align-items:center;justify-content:center;margin-bottom:16px;}
.svc-card .svc-ico svg{width:28px;height:28px;}
.svc-card h3{font-size:18px;font-weight:700;color:var(--ink);margin-bottom:8px;}
.svc-card p{font-size:14px;color:var(--ink-3);}

/* 流程步骤 */
.flow-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:48px;counter-reset:step;}
.flow-step{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;position:relative;}
.flow-step .n{counter-increment:step;font-size:28px;font-weight:800;color:var(--accent);opacity:.7;}
.flow-step .n::before{content:"0" counter(step);}
.flow-step h4{font-size:16px;font-weight:700;margin:10px 0 6px;}
.flow-step p{font-size:13px;color:var(--muted);}

/* ---------- 转化区(深色) ---------- */
.cta-band{background:radial-gradient(900px 400px at 50% 0%,rgba(12,111,176,0.25),transparent 60%),var(--bg);text-align:center;}
.conv-box{max-width:780px;margin:0 auto;}
.conv-box h2{font-size:clamp(26px,3.4vw,40px);font-weight:800;}
.conv-box p{color:var(--muted);margin-top:14px;font-size:16px;}
.conv-cta{display:flex;gap:18px;justify-content:center;margin-top:34px;flex-wrap:wrap;}
.conv-contact{margin-top:34px;display:flex;gap:30px;justify-content:center;flex-wrap:wrap;color:var(--silver);font-size:15px;}
.conv-contact a:hover{color:#5cc6f0;}

/* ---------- 联系页表单 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;margin-top:48px;align-items:start;}
.contact-info .ci-item{display:flex;gap:16px;margin-bottom:24px;}
.contact-info .ci-ico{width:46px;height:46px;flex:0 0 auto;border-radius:12px;background:var(--light-3);display:flex;align-items:center;justify-content:center;}
.contact-info .ci-ico svg{width:24px;height:24px;}
.contact-info h4{font-size:15px;color:var(--ink-3);font-weight:600;margin-bottom:2px;}
.contact-info .ci-val{font-size:17px;font-weight:700;color:var(--ink);}
.contact-info a:hover .ci-val{color:var(--accent-2);}
.form-card{background:var(--light);border:1px solid #E2EAF2;border-radius:var(--radius);padding:32px;box-shadow:0 10px 30px rgba(20,40,70,0.08);}
.form-card h3{font-size:20px;font-weight:800;color:var(--ink);margin-bottom:6px;}
.form-card .hint{font-size:13px;color:var(--ink-3);margin-bottom:22px;}
.field{margin-bottom:18px;}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink-2);margin-bottom:8px;}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1px solid #D5E4F2;border-radius:10px;font-family:inherit;font-size:15px;color:var(--ink);background:var(--light-2);transition:.2s;}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(30,143,196,0.12);}
.field textarea{resize:vertical;min-height:110px;}
.form-note{font-size:12px;color:var(--ink-3);margin-top:10px;}
.contact-head{max-width:720px;margin-bottom:6px;}
.contact-head .title{margin-top:10px;}
.ci-title{font-size:20px;font-weight:800;color:var(--ink);margin-bottom:22px;letter-spacing:.02em;}
.ci-service{margin-top:30px;padding-top:22px;border-top:1px solid #E2EAF2;}
.ci-svc-row{display:flex;justify-content:space-between;gap:16px;font-size:14px;padding:7px 0;color:var(--ink-3);}
.ci-svc-row b{color:var(--ink);font-weight:700;}
.form-card .btn{margin-top:6px;width:100%;justify-content:center;}
.form-card .field:last-of-type{margin-bottom:8px;}

/* ---------- 页脚 ---------- */
footer{background:#070B12;border-top:1px solid var(--line);padding:54px 0 30px;}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;}
.foot-brand .name{font-weight:800;font-size:18px;}
.foot-brand .name .hl{color:var(--accent);}
.foot-brand p{color:var(--muted);font-size:14px;margin-top:14px;max-width:340px;}
.foot-col h4{font-size:14px;letter-spacing:.1em;color:var(--silver);margin-bottom:14px;}
.foot-col a,.foot-col span{display:block;color:var(--muted);font-size:14px;margin-bottom:10px;transition:.2s;}
.foot-col a:hover{color:var(--accent);}
.foot-bottom{border-top:1px solid var(--line);margin-top:40px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:13px;}
.foot-bottom a:hover{color:var(--accent);}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s ease,transform .8s ease;}
.reveal.in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media(max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:30px;}
  .hero-figure{order:-1;}
  .cap-grid{grid-template-columns:repeat(2,1fr);}
  .eq-grid{grid-template-columns:repeat(2,1fr);}
  .sol-grid{grid-template-columns:repeat(2,1fr);}
  .svc-grid{grid-template-columns:repeat(2,1fr);}
  .flow-steps{grid-template-columns:repeat(2,1fr);}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:36px 20px;}
  .adv-row{grid-template-columns:1fr;gap:26px;}
  .adv-row.reverse .adv-img{order:0;}
  .contact-grid{grid-template-columns:1fr;gap:40px;}
  .foot-grid{grid-template-columns:1fr 1fr;}
}
@media(max-width:680px){
  .nav-links{position:fixed;top:var(--nav-h);right:0;height:calc(100vh - var(--nav-h));width:78%;max-width:320px;background:rgba(10,14,22,0.98);flex-direction:column;align-items:flex-start;gap:8px;padding:30px 28px;transform:translateX(110%);transition:transform .35s ease;border-left:1px solid var(--line);}
  .nav-links.open{transform:none;}
  .nav-links a{padding:12px 0;width:100%;border-bottom:1px solid var(--line);font-size:17px;}
  .nav-phone{display:none;}
  .burger{display:flex;}
  .cap-grid,.eq-grid,.sol-grid,.svc-grid{grid-template-columns:1fr;}
  .flow-steps{grid-template-columns:1fr;}
  .data-grid{grid-template-columns:1fr 1fr;}
  .foot-grid{grid-template-columns:1fr;}
  .brand .name{font-size:13px;}
  .hero h1{font-size:30px;}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;}.reveal{opacity:1;transform:none;}html{scroll-behavior:auto;}}