/* ===== 上海师博丹科技有限公司 官网样式 v2 ===== */
:root{
  --blue:#1F6BFF;
  --blue-d:#0B44C8;
  --blue-l:#4C8DFF;
  --cyan:#00B8E6;
  --ink:#0E1B33;
  --ink-2:#3B4A63;
  --ink-3:#6B7A90;
  --line:#E6EBF3;
  --bg:#FFFFFF;
  --bg-soft:#F5F8FD;
  --radius:16px;
  --shadow-s:0 2px 10px rgba(16,40,80,.06);
  --shadow-m:0 10px 30px rgba(16,40,80,.08);
  --shadow-l:0 22px 60px rgba(16,40,80,.14);
  --maxw:1200px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
  color:var(--ink-2);background:var(--bg);line-height:1.75;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img,svg{display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button,input,select,textarea{font-family:inherit;font-size:inherit;outline:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ===== 滚动进度条 ===== */
.scroll-progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:120;
  background:linear-gradient(90deg,var(--cyan),var(--blue));
  border-radius:0 3px 3px 0;
}

/* ===== 通用按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:10px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.25s ease;white-space:nowrap;
}
.btn-sm{padding:9px 18px;font-size:14px;border-radius:8px}
.btn-primary{background:linear-gradient(120deg,var(--blue) 0%,var(--blue-l) 100%);color:#fff;box-shadow:0 8px 22px rgba(31,107,255,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(31,107,255,.36)}
.btn-ghost{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.35);color:#fff;backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,.2);transform:translateY(-2px)}
.btn-white{background:#fff;color:var(--blue);box-shadow:0 8px 22px rgba(0,0,0,.16)}
.btn-white:hover{transform:translateY(-2px)}
.btn-block{width:100%}

/* ===== 顶部导航 ===== */
.header{
  position:fixed;top:0;left:0;right:0;z-index:100;height:72px;
  background:rgba(255,255,255,.86);backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:.3s ease;
}
.header.scrolled{box-shadow:0 4px 24px rgba(16,40,80,.08);border-bottom-color:var(--line)}
.header-inner{height:72px;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;background:linear-gradient(135deg,#EAF1FF,#DCEBFF)}
.logo-text{display:flex;flex-direction:column;line-height:1.25}
.logo-text strong{font-size:17px;color:var(--ink);letter-spacing:.5px;white-space:nowrap}
.logo-text em{font-size:10px;font-style:normal;color:var(--ink-3);letter-spacing:1.4px}

.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-link{
  position:relative;padding:8px 11px;font-size:15px;color:var(--ink-2);
  border-radius:8px;transition:.2s;white-space:nowrap;
}
.nav-link:hover{color:var(--blue);background:var(--bg-soft)}
.nav-link.active{color:var(--blue);font-weight:600}
.nav-link.active::after{
  content:"";position:absolute;left:11px;right:11px;bottom:2px;height:2px;
  background:var(--blue);border-radius:2px;
}
.header-cta{display:flex;align-items:center;gap:12px}
.hotline{display:flex;align-items:center;gap:6px;color:var(--ink);font-weight:700;font-size:15px;letter-spacing:.3px}
.hotline svg{color:var(--blue)}
.menu-toggle{display:none;width:40px;height:40px;border:none;background:var(--bg-soft);border-radius:9px;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer}
.menu-toggle span{width:18px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{
  position:relative;padding:148px 0 90px;overflow:hidden;
  background:linear-gradient(160deg,#0A1C3D 0%,#123A7A 48%,#1F6BFF 100%);
  color:#fff;
}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.glow{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5}
.glow-1{width:420px;height:420px;background:#2E7BFF;top:-120px;right:-60px}
.glow-2{width:360px;height:360px;background:#00B8E6;bottom:-160px;left:-80px;opacity:.35}
.glow-3{width:300px;height:300px;background:#7B5CFF;top:30%;left:42%;opacity:.22}
.grid-lines{
  position:absolute;inset:0;opacity:.16;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse at 50% 40%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 40%,#000 20%,transparent 78%);
}
.hero-inner{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.tag-pill{
  display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;font-size:13px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);
  backdrop-filter:blur(6px);letter-spacing:.5px;
}
.pill-dot{width:7px;height:7px;border-radius:50%;background:#28E07A;box-shadow:0 0 8px #28E07A;animation:blink 1.6s infinite}
.hero h1{
  margin:20px 0 18px;font-size:clamp(30px,4.2vw,46px);line-height:1.26;font-weight:800;color:#fff;letter-spacing:-.5px;
}
.hero h1 .hl{
  background:linear-gradient(100deg,#7FD7FF,#FFFFFF 60%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-desc{font-size:16.5px;color:rgba(255,255,255,.86);max-width:580px}
.hero-desc strong{color:#fff}
.hero-actions{display:flex;gap:14px;margin:30px 0 34px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:580px;padding-top:24px;border-top:1px solid rgba(255,255,255,.18)}
.hero-stats b{display:block;font-size:26px;font-weight:800;color:#fff;line-height:1.2}
.hero-stats span{font-size:12.5px;color:rgba(255,255,255,.72)}

/* 监控看板 */
.hero-visual{position:relative}
.panel{
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);
  border-radius:18px;backdrop-filter:blur(16px);box-shadow:0 30px 70px rgba(0,10,40,.35);overflow:hidden;
}
.panel-head{
  display:flex;align-items:center;gap:7px;padding:12px 16px;
  background:rgba(255,255,255,.08);border-bottom:1px solid rgba(255,255,255,.14);
}
.dot{width:9px;height:9px;border-radius:50%;display:inline-block}
.dot.red{background:#FF5F57}.dot.yellow{background:#FEBC2E}.dot.green{background:#28C840}
.panel-title{margin-left:8px;font-size:13px;color:rgba(255,255,255,.86);font-weight:600}
.live{margin-left:auto;display:flex;align-items:center;gap:5px;font-size:11px;color:#7FD7FF;letter-spacing:1px;font-weight:700}
.live i{width:6px;height:6px;border-radius:50%;background:#28E07A;box-shadow:0 0 0 0 rgba(40,224,122,.7);animation:pulse 1.6s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 8px rgba(40,224,122,0)}100%{box-shadow:0 0 0 0 rgba(40,224,122,0)}}
.panel-body{padding:18px}
.panel-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:14px}
.kv{
  background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.13);
  border-radius:12px;padding:12px 14px;
}
.kv span{display:block;font-size:12px;color:rgba(255,255,255,.7)}
.kv b{font-size:20px;color:#fff}
.kv b.ok{color:#5BE59A}.kv b.warn{color:#FFC24C}
.store-list{display:flex;flex-direction:column;gap:8px}
.store-item{
  display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;
  background:rgba(255,255,255,.06);font-size:13px;color:rgba(255,255,255,.9);
}
.store-item span{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.store-item em{font-style:normal;font-size:12px;color:rgba(255,255,255,.6)}
.store-item em{color:#9BE7C4}
.st{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.st.ok{background:#28E07A}.st.warn{background:#FFC24C;animation:blink 1.2s infinite}
@keyframes blink{50%{opacity:.35}}
.panel-foot{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px;padding-top:14px;border-top:1px solid rgba(255,255,255,.14)}
.metric b{display:block;font-size:17px;color:#fff;font-weight:800}
.metric span{font-size:11.5px;color:rgba(255,255,255,.65)}
.float-card{
  position:absolute;display:flex;align-items:center;gap:9px;padding:10px 14px;
  background:#fff;border-radius:12px;box-shadow:var(--shadow-m);color:var(--blue);
}
.float-card b{display:block;font-size:13px;color:var(--ink)}
.float-card span{font-size:11.5px;color:var(--ink-3)}
.fc-1{top:-18px;right:-14px;animation:float 4s ease-in-out infinite}
.fc-2{bottom:-18px;left:-18px;animation:float 4.6s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-9px)}}

/* ===== Section 通用 ===== */
.section{padding:92px 0}
.eyebrow{display:inline-block;font-size:12px;font-weight:800;letter-spacing:2.4px;color:var(--blue);margin-bottom:12px}
.eyebrow.light{color:#7FD7FF}
.section-title{font-size:clamp(24px,3vw,32px);line-height:1.4;font-weight:800;color:var(--ink);letter-spacing:-.3px}
.section-title.light{color:#fff}
.section-sub{margin-top:14px;font-size:15.5px;color:var(--ink-3);max-width:660px}
.section-sub.light{color:rgba(255,255,255,.72)}
.section-head{margin-bottom:48px}
.section-head.center{text-align:center}
.section-head.center .section-sub{margin-left:auto;margin-right:auto}

/* ===== 客户信任墙 ===== */
.brands{padding:72px 0 88px;background:#fff}
.brand-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-bottom:34px}
.brand-card{
  background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;
  padding:26px 18px 18px;text-align:center;transition:.3s;cursor:default;
}
.brand-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-m);background:#fff;border-color:rgba(31,107,255,.25)}
.brand-logo{
  height:52px;display:grid;place-items:center;margin-bottom:14px;
}
.brand-logo img{max-height:52px;max-width:82%;width:auto;object-fit:contain;transition:.3s;filter:none}
.brand-card:hover .brand-logo img{transform:scale(1.06)}
.brand-meta b{display:block;font-size:14px;color:var(--ink);font-weight:700}
.brand-meta span{display:inline-block;margin-top:4px;font-size:11.5px;padding:2px 10px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink-3)}
.brand-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;padding:22px;
  border-radius:14px;background:linear-gradient(120deg,#F0F5FF,#EAF9FF);
  border:1px solid #DCE8FB;
}
.strip-item{text-align:center}
.strip-item b{display:block;font-size:24px;font-weight:800;background:linear-gradient(120deg,var(--blue),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.strip-item span{font-size:12.5px;color:var(--ink-3)}

/* ===== 服务简介 ===== */
.intro-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:52px;align-items:start;margin-bottom:48px}
.intro-left .section-title{max-width:420px}
.intro-lead{margin-top:16px;font-size:15.5px;color:var(--ink-2)}
.intro-right p{font-size:16px;margin-bottom:16px}
.intro-right p:last-child{margin-bottom:0}
.intro-right strong{color:var(--ink)}
.mode-cards{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.mode-card{
  position:relative;padding:32px;border-radius:var(--radius);
  background:var(--bg-soft);border:1px solid var(--line);transition:.3s;
}
.mode-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-m)}
.mode-card.accent{background:linear-gradient(140deg,#123A7A,#1F6BFF);border-color:transparent;color:#fff}
.mode-tag{font-size:11px;font-weight:800;letter-spacing:2px;color:var(--blue)}
.mode-card.accent .mode-tag{color:#7FD7FF}
.mode-card h3{margin:10px 0 12px;font-size:22px;color:var(--ink)}
.mode-card.accent h3{color:#fff}
.mode-card p{font-size:15px}
.mode-card.accent p{color:rgba(255,255,255,.82)}
.mode-card ul{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.mode-card li{font-size:12.5px;padding:5px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink-2)}
.mode-card.accent li{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.22);color:#fff}

/* ===== 核心服务 ===== */
.services{background:var(--bg-soft)}
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.service-card{
  position:relative;overflow:hidden;padding:30px 28px 28px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);transition:.3s;
}
.service-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-m);border-color:rgba(31,107,255,.28)}
.svc-icon{
  display:grid;place-items:center;width:50px;height:50px;border-radius:13px;margin-bottom:18px;
  background:linear-gradient(135deg,#E8F0FF,#D6E6FF);color:var(--blue);
}
.service-card:hover .svc-icon{background:linear-gradient(135deg,var(--blue),var(--blue-l));color:#fff}
.service-card h3{font-size:18px;font-weight:700;color:var(--ink);margin-bottom:10px}
.service-card p{font-size:14.5px;color:var(--ink-3);margin-bottom:14px}
.svc-list{display:flex;flex-direction:column;gap:7px}
.svc-list li{position:relative;padding-left:16px;font-size:13.5px;color:var(--ink-2)}
.svc-list li::before{
  content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
}
.svc-no{
  position:absolute;right:18px;bottom:6px;font-size:52px;font-weight:900;
  color:rgba(31,107,255,.07);line-height:1;letter-spacing:-2px;
}
.service-card.wide{grid-column:span 3;background:linear-gradient(120deg,#0E2340,#173A72);border-color:transparent}
.service-card.wide h3,.service-card.wide .svc-list li{color:#fff}
.service-card.wide p{color:rgba(255,255,255,.72)}
.service-card.wide .svc-icon{background:rgba(255,255,255,.14);color:#7FD7FF}
.service-card.wide .svc-no{color:rgba(255,255,255,.08)}
.service-card.wide .svc-list{display:grid;grid-template-columns:repeat(3,1fr);max-width:760px}

/* ===== 服务优势 ===== */
.advantage{background:linear-gradient(160deg,#0A1C3D 0%,#123A7A 55%,#1B57D6 100%);color:#fff}
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.adv-card{
  padding:30px 26px;border-radius:var(--radius);
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);
  backdrop-filter:blur(8px);transition:.3s;
}
.adv-card:hover{background:rgba(255,255,255,.13);transform:translateY(-6px)}
.adv-num{font-size:13px;font-weight:900;letter-spacing:1.5px;color:#7FD7FF;margin-bottom:12px}
.adv-card h3{font-size:19px;font-weight:700;color:#fff;margin-bottom:10px}
.adv-card p{font-size:14.5px;color:rgba(255,255,255,.78)}
.adv-metric{
  display:inline-block;margin-top:16px;padding:5px 12px;border-radius:999px;font-size:12.5px;
  background:rgba(127,215,255,.15);border:1px solid rgba(127,215,255,.3);color:#7FD7FF;
}

/* ===== 客户案例 ===== */
.cases{background:var(--bg-soft)}
.case-wrap{
  display:grid;grid-template-columns:250px 1fr;gap:0;
  background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow-s);
}
.case-tabs{
  display:flex;flex-direction:column;gap:0;background:linear-gradient(180deg,#0E2340,#14315E);padding:14px;
}
.case-tab{
  display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;
  padding:16px 18px;border:none;background:transparent;border-radius:12px;cursor:pointer;
  color:rgba(255,255,255,.65);transition:.25s;position:relative;
}
.case-tab b{font-size:22px;font-weight:800;color:rgba(255,255,255,.85);line-height:1.2}
.case-tab span{font-size:13px}
.case-tab:hover{background:rgba(255,255,255,.08);color:#fff}
.case-tab.on{background:linear-gradient(120deg,var(--blue),var(--blue-l));color:#fff;box-shadow:0 8px 18px rgba(31,107,255,.35)}
.case-tab.on b{color:#fff}
.case-panel{display:none;padding:38px 40px;grid-template-columns:1.1fr .9fr;gap:36px;animation:fadeUp .45s ease}
.case-panel.on{display:grid}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.case-badge{
  display:inline-block;padding:5px 14px;border-radius:999px;font-size:12.5px;font-weight:600;
  background:#EAF1FF;color:var(--blue);margin-bottom:16px;
}
.case-left h3{font-size:23px;color:var(--ink);font-weight:800;line-height:1.45;margin-bottom:22px;letter-spacing:-.3px}
.case-block{margin-bottom:18px}
.case-block h5{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--ink);font-weight:700;margin-bottom:8px}
.cb-ico{width:8px;height:8px;border-radius:50%;display:inline-block}
.cb-ico.bg{background:var(--blue)}
.cb-ico.cy{background:var(--cyan)}
.case-block p{font-size:14.5px;color:var(--ink-3)}
.case-tags{display:flex;flex-wrap:wrap;gap:8px}
.case-tags span{font-size:12.5px;padding:5px 12px;border-radius:999px;background:var(--bg-soft);border:1px solid var(--line);color:var(--ink-2)}
.case-right{
  background:linear-gradient(160deg,#F5F8FD,#EFF4FB);border:1px solid var(--line);
  border-radius:16px;padding:26px;
}
.cr-title{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:16px;display:flex;align-items:center;gap:8px}
.cr-title::before{content:"";width:16px;height:3px;border-radius:2px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
.case-result{display:flex;gap:14px;align-items:flex-start;padding:13px 0;border-bottom:1px dashed var(--line)}
.case-result:last-child{border-bottom:none;padding-bottom:0}
.case-result b{flex-shrink:0;min-width:86px;font-size:24px;font-weight:800;line-height:1.25;background:linear-gradient(120deg,var(--blue),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.case-result b i{font-style:normal}
.case-result p{font-size:13.5px;color:var(--ink-3);line-height:1.65}
.case-note{margin-top:18px;font-size:12.5px;color:var(--ink-3);text-align:center}

/* ===== 服务流程 ===== */
.process-track{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;position:relative}
.step{position:relative;text-align:center;padding:0 8px}
.step::after{
  content:"";position:absolute;top:22px;left:calc(50% + 26px);right:calc(-50% + 26px);height:2px;
  background:linear-gradient(90deg,var(--blue),rgba(31,107,255,.18));
}
.step:last-child::after{display:none}
.step-dot{
  position:relative;z-index:2;width:46px;height:46px;margin:0 auto 16px;border-radius:50%;
  display:grid;place-items:center;font-size:17px;font-weight:800;color:#fff;
  background:linear-gradient(135deg,var(--blue),var(--blue-l));box-shadow:0 8px 18px rgba(31,107,255,.3);
}
.step h4{font-size:16.5px;color:var(--ink);margin-bottom:8px;font-weight:700}
.step p{font-size:13.5px;color:var(--ink-3)}
.sla-bar{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:56px;
  padding:26px;border-radius:var(--radius);background:var(--bg-soft);border:1px solid var(--line);
}
.sla-item{text-align:center}
.sla-item b{display:block;font-size:28px;font-weight:800;color:var(--blue);line-height:1.2}
.sla-item span{font-size:13px;color:var(--ink-3)}

/* ===== FAQ ===== */
.faq{background:var(--bg-soft)}
.faq-wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:52px;align-items:start}
.faq-head .section-sub{max-width:420px}
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.25s;
}
.faq-item.open{border-color:rgba(31,107,255,.3);box-shadow:var(--shadow-s)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:18px 22px;border:none;background:transparent;cursor:pointer;
  font-size:15.5px;font-weight:600;color:var(--ink);text-align:left;
}
.faq-q i{
  flex-shrink:0;width:22px;height:22px;border-radius:50%;position:relative;background:var(--bg-soft);transition:.3s;
}
.faq-q i::before,.faq-q i::after{
  content:"";position:absolute;background:var(--blue);border-radius:2px;top:50%;left:50%;
}
.faq-q i::before{width:10px;height:2px;transform:translate(-50%,-50%)}
.faq-q i::after{width:2px;height:10px;transform:translate(-50%,-50%);transition:.3s}
.faq-item.open .faq-q i{background:var(--blue)}
.faq-item.open .faq-q i::before,.faq-item.open .faq-q i::after{background:#fff}
.faq-item.open .faq-q i::after{transform:translate(-50%,-50%) rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 22px 20px;font-size:14.5px;color:var(--ink-3)}

/* ===== 关于我们 ===== */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:52px;align-items:center}
.about-left .section-title{margin-bottom:18px}
.about-left p{font-size:15.5px;margin-bottom:14px}
.about-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.about-tags span{padding:6px 14px;border-radius:999px;font-size:13px;background:var(--bg-soft);border:1px solid var(--line);color:var(--ink-2)}
.mission-card{
  padding:34px;border-radius:20px;color:#fff;
  background:linear-gradient(140deg,#0E2340,#1F6BFF);box-shadow:var(--shadow-l);
}
.mission-card h4{font-size:20px;margin-bottom:20px;font-weight:700}
.mission-card ul{display:flex;flex-direction:column;gap:14px}
.mission-card li{display:flex;gap:10px;font-size:14.5px;color:rgba(255,255,255,.88);line-height:1.7}
.mission-card li i{
  flex-shrink:0;width:18px;height:18px;margin-top:6px;border-radius:50%;
  background:rgba(255,255,255,.16);position:relative;
}
.mission-card li i::after{
  content:"";position:absolute;left:6px;top:3px;width:4px;height:8px;
  border:solid #7FD7FF;border-width:0 2px 2px 0;transform:rotate(45deg);
}

/* ===== 联系我们 ===== */
.contact{background:var(--bg-soft)}
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:32px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:14px}
.info-item{
  display:flex;gap:14px;padding:20px;background:#fff;border:1px solid var(--line);
  border-radius:14px;transition:.3s;
}
.info-item:hover{box-shadow:var(--shadow-m);border-color:rgba(31,107,255,.28)}
.info-ico{
  flex-shrink:0;width:42px;height:42px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,#E8F0FF,#D6E6FF);color:var(--blue);
}
.info-item b{display:block;font-size:13px;color:var(--ink-3);font-weight:500}
.info-item div span,.info-item div a{display:block;font-size:16px;font-weight:700;color:var(--ink);margin:2px 0}
.info-item div a:hover{color:var(--blue)}
.info-item em{font-style:normal;font-size:12.5px;color:var(--ink-3)}

.contact-form{
  padding:34px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-s);
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:block;margin-bottom:16px}
.field>span{display:block;font-size:13.5px;color:var(--ink);font-weight:600;margin-bottom:7px}
.field>span i{color:#E5484D;font-style:normal}
.field input,.field select,.field textarea{
  width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:10px;
  background:#FBFCFE;font-size:14.5px;color:var(--ink);transition:.2s;
}
.field textarea{resize:vertical;line-height:1.7}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--blue);background:#fff;box-shadow:0 0 0 3px rgba(31,107,255,.12);
}
.field input::placeholder,.field textarea::placeholder{color:#A6B2C4}
.err{display:none;font-style:normal;font-size:12px;color:#E5484D;margin-top:5px}
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:#E5484D;background:#FFF6F6}
.field.invalid .err{display:block}
.chip-group{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:7px 14px;border-radius:999px;border:1px solid var(--line);background:#FBFCFE;
  font-size:13px;color:var(--ink-2);cursor:pointer;transition:.2s;
}
.chip:hover{border-color:var(--blue-l);color:var(--blue)}
.chip.on{background:linear-gradient(120deg,var(--blue),var(--blue-l));border-color:transparent;color:#fff;font-weight:600}
.form-tip{margin-top:12px;font-size:12px;color:var(--ink-3);text-align:center}

/* ===== 底部 CTA ===== */
.cta-band{background:linear-gradient(120deg,#1F6BFF,#0B44C8);padding:52px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.cta-inner h2{font-size:26px;color:#fff;font-weight:800}
.cta-inner p{margin-top:8px;color:rgba(255,255,255,.82);font-size:15px}

/* ===== 页脚 ===== */
.footer{background:#0A1628;color:rgba(255,255,255,.7);padding:56px 0 24px}
.footer-inner{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:32px}
.f-brand .logo{margin-bottom:14px}
.f-brand .logo-text strong{color:#fff}
.f-brand p{font-size:13.5px;line-height:1.8;max-width:320px}
.f-col h5{font-size:15px;color:#fff;margin-bottom:14px;font-weight:700}
.f-col a,.f-col span{display:block;font-size:13.5px;margin-bottom:9px;transition:.2s}
.f-col a:hover{color:#7FD7FF}
.footer-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:12.5px;color:rgba(255,255,255,.5);
}
.footer-bottom a{transition:.2s}
.footer-bottom a:hover{color:#7FD7FF}

/* ===== 返回顶部 / Toast ===== */
.to-top{
  position:fixed;right:24px;bottom:28px;width:44px;height:44px;border:none;border-radius:50%;
  background:#fff;border:1px solid var(--line);color:var(--blue);cursor:pointer;
  display:grid;place-items:center;box-shadow:var(--shadow-m);opacity:0;visibility:hidden;transition:.3s;z-index:90;
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.toast{
  position:fixed;left:50%;top:92px;transform:translate(-50%,-16px);z-index:200;
  display:flex;align-items:center;gap:9px;padding:12px 22px;border-radius:12px;
  background:#0E1B33;color:#fff;font-size:14.5px;box-shadow:var(--shadow-l);
  opacity:0;visibility:hidden;transition:.3s;
}
.toast.show{opacity:1;visibility:visible;transform:translate(-50%,0)}
.toast-ico{
  width:20px;height:20px;border-radius:50%;background:#28C840;color:#fff;
  display:grid;place-items:center;font-size:12px;font-weight:700;
}

/* ===== 滚动进入动画 ===== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
/* 公司全称下为顶部导航预留空间 */
@media (max-width:1180px){
  .nav-link{padding:8px 8px;font-size:14.5px}
  .nav-link.active::after{left:8px;right:8px}
  .header-cta .hotline{display:none}
  .logo-text strong{font-size:16px}
}
@media (max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-visual{max-width:520px}
  .service-grid{grid-template-columns:repeat(2,1fr)}
  .service-card.wide{grid-column:span 2}
  .service-card.wide .svc-list{grid-template-columns:1fr}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .brand-grid{grid-template-columns:repeat(3,1fr)}
  .brand-strip{grid-template-columns:repeat(2,1fr)}
  .process-track{grid-template-columns:repeat(3,1fr);gap:28px 18px}
  .step:nth-child(3)::after{display:none}
  .intro-grid,.about-grid,.contact-grid,.faq-wrap{grid-template-columns:1fr;gap:32px}
  .case-wrap{grid-template-columns:1fr}
  .case-tabs{flex-direction:row;flex-wrap:wrap}
  .case-tab{flex:1 1 40%}
  .case-panel{grid-template-columns:1fr;padding:28px}
  .footer-inner{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:768px){
  .nav{
    position:fixed;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow-m);
    padding:8px 16px 16px;transform:translateY(-12px);opacity:0;visibility:hidden;transition:.25s;
  }
  .nav.open{transform:none;opacity:1;visibility:visible}
  .nav-link{padding:12px 10px;border-radius:8px}
  .nav-link.active::after{display:none}
  .nav-link.active{background:var(--bg-soft)}
  .header-cta .hotline{display:none}
  .menu-toggle{display:flex;margin-left:auto}
  .hero{padding:120px 0 70px}
  .hero-desc{font-size:15px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:18px}
  .float-card{display:none}
  .section{padding:64px 0}
  .brands{padding:56px 0 64px}
  .mode-cards{grid-template-columns:1fr}
  .service-grid{grid-template-columns:1fr}
  .service-card.wide{grid-column:span 1}
  .adv-grid{grid-template-columns:1fr}
  .brand-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .process-track{grid-template-columns:1fr;gap:22px}
  .step{text-align:left;display:flex;gap:14px;align-items:flex-start;padding:0}
  .step-dot{margin:0;flex-shrink:0}
  .step::after{display:none}
  .sla-bar{grid-template-columns:repeat(2,1fr);gap:20px}
  .form-row{grid-template-columns:1fr}
  .contact-form{padding:24px}
  .footer-inner{grid-template-columns:1fr}
  .cta-inner h2{font-size:21px}
  .footer-bottom{flex-direction:column;gap:6px}
  .case-tab{flex:1 1 45%;padding:12px 14px}
  .case-tab b{font-size:18px}
  .case-panel{padding:22px}
  .case-right{padding:20px}
  .case-result b{min-width:72px;font-size:20px}
  .faq-q{padding:15px 16px;font-size:14.5px}
  .faq-a p{padding:0 16px 16px}
}