/* 
  长沙泽码科技 - 极简创业版官网
  说明：
  - 纯静态 HTML/CSS/JS，无外部图片素材
  - 字体使用系统中文字体栈（不依赖付费字体）
*/

:root{
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --primary: #2563eb;
  --primary-2: #1d4ed8;
  --navy: #0f172a;
  --shadow: 0 16px 40px rgba(15, 23, 42, .10);
  --shadow-sm: 0 10px 24px rgba(15, 23, 42, .10);
  --radius: 18px;
  --radius-sm: 14px;
  --container: 1200px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", "Source Han Sans SC", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

a{color:inherit; text-decoration:none}
a:hover{color: var(--primary)}
img{max-width:100%; display:block}

.container{max-width: var(--container); margin:0 auto; padding:0 24px;}
@media (max-width: 900px){
  .container{padding:0 16px;}
}

header.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  height: 78px;
}

.brand{
  display:flex; align-items:center; gap:12px;
}
.brand-mark{
  width:34px; height:34px; border-radius:50%;
  background: var(--primary);
  position:relative;
  box-shadow: 0 10px 20px rgba(37,99,235,.25);
}
.brand-mark:before, .brand-mark:after{
  content:""; position:absolute; background:#fff; border-radius:2px;
}
.brand-mark:before{
  width: 18px; height: 2px; left: 9px; top: 12px; transform: rotate(24deg);
}
.brand-mark:after{
  width: 20px; height: 2px; left: 7px; top: 21px; transform: rotate(-24deg);
}
.brand-title{display:flex; flex-direction:column; line-height:1.1}
.brand-title strong{font-size:18px; letter-spacing:.2px}
.brand-title span{font-size:12px; color: var(--muted)}

.nav{
  display:flex; align-items:center; gap:20px;
}
.nav a{
  font-size:14px;
  color: var(--muted);
  padding: 8px 2px;
  position:relative;
}
.nav a[aria-current="page"]{
  color: var(--primary);
  font-weight: 600;
}
.nav a[aria-current="page"]::after{
  content:""; position:absolute; left:0; right:0; bottom:0;
  height: 3px; border-radius: 3px;
  background: var(--primary);
}
.header-cta{
  display:flex; align-items:center; gap:10px;
}
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  border-radius: 14px;
  padding: 10px 16px;
  font-size:14px;
  border: 1px solid transparent;
  cursor:pointer;
  transition: transform .06s ease, box-shadow .2s ease, background .2s ease;
  user-select:none;
}
.btn:active{transform: translateY(1px);}
.btn-primary{
  background: var(--primary);
  color:#fff;
  box-shadow: 0 12px 24px rgba(37,99,235,.22);
}
.btn-primary:hover{background: var(--primary-2); color:#fff;}
.btn-ghost{
  background: #fff;
  border-color: var(--line);
  color: var(--primary);
}
.btn-ghost:hover{border-color: rgba(37,99,235,.35); color: var(--primary-2);}

.hamburger{display:none; border:1px solid var(--line); background:#fff; border-radius: 12px; padding:10px;}
.hamburger svg{width:18px; height:18px}
@media (max-width: 980px){
  .nav{display:none;}
  .hamburger{display:inline-flex;}
}

/* Mobile menu */
.mobile-menu{
  display:none;
  border-top: 1px solid var(--line);
  background:#fff;
}
.mobile-menu.open{display:block;}
.mobile-menu a{
  display:block;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.mobile-menu a[aria-current="page"]{color: var(--primary); font-weight: 600;}

/* Hero */
.hero{
  position:relative;
  overflow:hidden;
  padding: 92px 0 64px;
  background: linear-gradient(90deg, var(--navy), var(--primary));
  color:#fff;
}
.hero .container{position:relative; z-index:2}
.hero h1{
  margin:0 0 12px;
  font-size:52px;
  letter-spacing: -0.6px;
}
.hero p{
  margin:0 0 22px;
  max-width: 820px;
  color: rgba(235,245,255,.95);
  font-size: 16px;
}
.hero-actions{display:flex; gap:12px; flex-wrap:wrap}
.hero .btn-ghost{background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.18); color:#fff}
.hero .btn-ghost:hover{background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.28);}

.hero-pattern{
  position:absolute; inset:0; z-index:1; pointer-events:none;
  background:
    radial-gradient(600px 300px at 85% 25%, rgba(255,255,255,.18), transparent 60%),
    radial-gradient(520px 280px at 70% 85%, rgba(255,255,255,.14), transparent 65%),
    linear-gradient(135deg, rgba(255,255,255,.14), transparent 35%);
  opacity:.9;
}
.hero-lines{
  position:absolute; inset:0; z-index:1; pointer-events:none; opacity:.35;
  background:
    linear-gradient(120deg, transparent 45%, rgba(255,255,255,.32) 46%, transparent 47%) 0 0/240px 160px,
    linear-gradient(120deg, transparent 45%, rgba(255,255,255,.20) 46%, transparent 47%) 120px 80px/240px 160px;
}

.hero-stats{
  margin-top: 28px;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.stat{
  background: rgba(255,255,255,.92);
  color: var(--text);
  border-radius: 16px;
  padding: 14px 16px;
  box-shadow: 0 16px 30px rgba(15,23,42,.12);
}
.stat small{display:block; color: var(--muted); font-weight: 600}
.stat strong{display:block; font-size:22px; margin-top: 4px}
@media (max-width: 860px){
  .hero{padding: 72px 0 56px;}
  .hero h1{font-size: 38px;}
  .hero-stats{grid-template-columns: 1fr; gap: 10px;}
}

/* Sections */
main{padding-bottom: 40px;}
.section{padding: 56px 0;}
.section-title{display:flex; flex-direction:column; gap: 8px; margin-bottom: 18px;}
.section-title h2{margin:0; font-size: 28px; letter-spacing: -0.3px;}
.section-title p{margin:0; color: var(--muted);}

.card{
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(226,232,240,.55);
}

.grid{
  display:grid;
  gap: 18px;
}
.grid-3{grid-template-columns: repeat(3, 1fr);}
.grid-2{grid-template-columns: repeat(2, 1fr);}
.grid-4{grid-template-columns: repeat(4, 1fr);}
@media (max-width: 980px){
  .grid-4{grid-template-columns: repeat(2, 1fr);}
  .grid-3{grid-template-columns: repeat(2, 1fr);}
}
@media (max-width: 640px){
  .grid-4,.grid-3,.grid-2{grid-template-columns: 1fr;}
}

.service-card{
  padding: 18px;
  display:flex;
  flex-direction:column;
  gap: 10px;
  min-height: 210px;
}
.icon{
  width:40px; height:40px; border-radius: 12px;
  background: rgba(37,99,235,.12);
  display:grid; place-items:center;
}
.icon svg{width:22px; height:22px; fill: var(--primary);}
.service-card h3{margin:0; font-size: 18px;}
.service-card p{margin:0; color: var(--muted); font-size: 14px;}
.service-card .chip{
  margin-top:auto;
  align-self:flex-start;
  display:inline-flex; align-items:center; gap:8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #edf3ff;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
}

.feature-wrap{padding: 18px;}
.feature-grid{display:grid; grid-template-columns: repeat(2, 1fr); gap: 14px;}
@media (max-width: 740px){.feature-grid{grid-template-columns:1fr;}}
.feature{
  background: #f1f5f9;
  border-radius: 16px;
  padding: 14px 14px;
  display:flex; gap: 12px; align-items:flex-start;
}
.dot{
  width:28px; height:28px; border-radius: 50%;
  background: var(--primary);
  flex: 0 0 auto;
  margin-top: 2px;
  box-shadow: 0 12px 20px rgba(37,99,235,.25);
}
.feature h4{margin:0; font-size: 15px;}
.feature p{margin:4px 0 0; color: var(--muted); font-size: 13px;}

.process{padding: 18px;}
.process-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 980px){.process-grid{grid-template-columns: 1fr;}}
.step{
  display:flex; gap: 12px; align-items:flex-start;
  background: #f1f5f9;
  border-radius: 16px;
  padding: 14px;
}
.badge{
  width:34px; height:34px; border-radius: 50%;
  background: var(--primary);
  color:#fff;
  font-weight:700;
  display:grid; place-items:center;
  flex:0 0 auto;
}
.step h4{margin:0; font-size: 15px;}
.step p{margin:4px 0 0; color: var(--muted); font-size: 13px;}

.case-card{overflow:hidden;}
.case-top{
  height: 110px;
  background: linear-gradient(90deg, var(--navy), var(--primary));
  position:relative;
}
.case-top:after{
  content:"";
  position:absolute; inset:0;
  background:
    radial-gradient(120px 120px at 20% 60%, rgba(255,255,255,.25), transparent 60%),
    radial-gradient(180px 120px at 70% 30%, rgba(255,255,255,.18), transparent 60%),
    radial-gradient(140px 100px at 85% 85%, rgba(255,255,255,.14), transparent 65%);
  opacity:.9;
}
.case-body{padding: 14px 16px 16px;}
.case-body h3{margin:0; font-size: 16px;}
.case-meta{margin:4px 0 0; color: var(--muted); font-size: 12px;}
.case-metric{
  margin-top: 12px;
  background: #f0fdfa;
  border-radius: 14px;
  padding: 8px 10px;
  color: #10b981;
  font-weight: 700;
  font-size: 13px;
}

.cta{
  padding: 18px;
  display:flex; align-items:center; justify-content:space-between; gap: 14px;
}
.cta h3{margin:0; font-size: 18px;}
.cta p{margin:4px 0 0; color: var(--muted); font-size: 13px;}
@media (max-width: 820px){
  .cta{flex-direction:column; align-items:flex-start;}
}

/* Pricing */
.pricing-card{padding: 18px; display:flex; flex-direction:column; gap: 10px;}
.pricing-card .tag{
  display:inline-flex; align-items:center;
  padding: 6px 10px; border-radius: 999px;
  background: #edf3ff;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  align-self:flex-start;
}
.pricing-card h3{margin:0; font-size: 18px;}
.pricing-card .desc{margin:0; color: var(--muted); font-size: 13px;}
.price{
  font-size: 28px; font-weight: 800; color: var(--text);
  margin-top: 2px;
}
.price.primary{color: var(--primary);}
.kv{display:flex; gap: 10px; flex-wrap:wrap; color: var(--muted); font-size: 12px; font-weight: 700;}
.list{margin: 0; padding-left: 18px; color: var(--text); font-size: 13px;}
.list li{margin: 6px 0;}
.pricing-card .btn{margin-top:auto; width:100%;}

/* Forms */
.form-card{padding: 18px;}
.form-grid{display:grid; grid-template-columns: 1fr 1fr; gap: 14px;}
@media (max-width: 860px){.form-grid{grid-template-columns: 1fr;}}
.field label{display:block; font-size: 13px; font-weight: 700; color: var(--muted); margin-bottom: 6px;}
.field input, .field textarea, .field select{
  width:100%;
  border: 2px solid var(--line);
  border-radius: 14px;
  padding: 12px 12px;
  font-size: 14px;
  outline:none;
  background: #fff;
}
.field input:focus, .field textarea:focus, .field select:focus{
  border-color: rgba(37,99,235,.45);
  box-shadow: 0 0 0 4px rgba(37,99,235,.12);
}
.field textarea{min-height: 140px; resize: vertical;}
.form-actions{display:flex; gap: 12px; flex-wrap:wrap; margin-top: 12px;}
.toast{
  display:none;
  margin-top: 12px;
  background: #f0fdfa;
  border: 1px solid rgba(16,185,129,.35);
  color: #047857;
  border-radius: 14px;
  padding: 12px 12px;
  font-weight: 700;
  font-size: 13px;
}
.toast.show{display:block;}

/* Footer */
footer{
  margin-top: 40px;
  background: var(--navy);
  color: #fff;
}
.footer-inner{
  padding: 36px 0 24px;
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 18px;
}
@media (max-width: 860px){.footer-inner{grid-template-columns: 1fr;}}
.footer-inner .muted{color: rgba(226,232,240,.75); font-size: 13px;}
.footer-links a{display:block; color: rgba(226,232,240,.85); margin: 8px 0; font-size: 13px;}
.footer-bottom{
  border-top: 1px solid rgba(226,232,240,.12);
  padding: 14px 0;
  color: rgba(226,232,240,.72);
  font-size: 12px;
}

/* Utility */
.mt-8{margin-top: 8px}
.mt-12{margin-top: 12px}
.mt-18{margin-top: 18px}


/* Case filters */
.case-filter{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin: 14px 0 18px;
}
.case-filter button{
  border: 1px solid var(--line);
  background:#fff;
  color: var(--muted);
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 700;
  cursor:pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease, transform .06s ease;
}
.case-filter button:active{transform: translateY(1px);}
.case-filter button:hover{border-color: rgba(37,99,235,.35); color: var(--primary);}
.case-filter button.active{
  background: rgba(37,99,235,.10);
  border-color: rgba(37,99,235,.35);
  color: var(--primary);
}

.error-box{
  display:none;
  margin-top: 10px;
  background: #fff1f2;
  border: 1px solid rgba(244,63,94,.25);
  color: #9f1239;
  border-radius: 14px;
  padding: 10px 12px;
  font-weight: 800;
  font-size: 13px;
}

/* Case detail */
.breadcrumb{
  font-size: 13px;
  color: rgba(235,245,255,.92);
  margin-bottom: 10px;
}
.breadcrumb a{color: rgba(235,245,255,.92); text-decoration: underline; text-underline-offset: 3px;}
.detail-hero{
  display:flex;
  gap: 16px;
  align-items:flex-start;
  margin-top: 14px;
  flex-wrap:wrap;
}
.detail-chip{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.20);
  color:#fff;
  font-size: 13px;
  font-weight: 800;
}
.kpi-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 14px;
}
@media (max-width: 860px){.kpi-grid{grid-template-columns: 1fr;}}
.kpi{
  background: rgba(255,255,255,.92);
  border-radius: 16px;
  padding: 14px 16px;
  box-shadow: 0 16px 30px rgba(15,23,42,.12);
}
.kpi small{display:block; color: var(--muted); font-weight: 800;}
.kpi strong{display:block; margin-top: 6px; font-size: 20px;}

.two-col{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 18px;
}
@media (max-width: 980px){.two-col{grid-template-columns: 1fr;}}
.sticky-card{
  position: sticky;
  top: 96px;
}
.muted-note{color: var(--muted); font-size: 13px;}