/* ==========================================================================
   织码 WeaveCodes - 公共样式表
   设计系统：变量 / 排版 / 组件 / 动效 / 响应式
   ========================================================================== */

/* ---- 设计令牌 ---- */
:root{
  /* 主色 */
  --primary:#2563eb; --primary-dark:#1d4ed8; --primary-light:#dbeafe; --primary-50:#eff6ff;
  --accent:#0ea5e9; --accent-dark:#0284c7;
  /* 中性色 */
  --dark:#0f172a; --gray-50:#f8fafc; --gray-100:#f1f5f9; --gray-200:#e2e8f0;
  --gray-300:#cbd5e1; --gray-500:#64748b; --gray-600:#475569; --gray-700:#334155;
  --white:#fff;
  /* 语义色 */
  --grad:linear-gradient(135deg,#1e40af 0%,#2563eb 40%,#3b82f6 75%,#60a5fa 100%);
  --grad-soft:linear-gradient(135deg,#eff6ff 0%,#e0f2fe 100%);
  --shadow-xs:0 1px 2px rgba(15,23,42,.04);
  --shadow-sm:0 2px 8px rgba(15,23,42,.06);
  --shadow:0 4px 24px rgba(15,23,42,.07);
  --shadow-lg:0 16px 48px rgba(15,23,42,.12);
  --shadow-blue:0 8px 32px rgba(37,99,235,.18);
  /* 圆角 */
  --r-sm:8px; --r:12px; --r-lg:16px; --r-xl:24px; --r-full:9999px;
  /* 过渡 */
  --t:.28s cubic-bezier(.4,0,.2,1);
  /* 布局 */
  --nav-h:64px; --maxw:1200px;
}

/* ---- Reset ---- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 20px)}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--dark);line-height:1.7;background:#fff;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
ul{list-style:none}

/* ---- 布局 ---- */
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:84px 0}
.section-gray{background:var(--gray-50)}
.text-center{text-align:center}

/* ---- 排版 ---- */
.section-tag{
  display:inline-block;font-size:13px;font-weight:700;color:var(--primary);
  letter-spacing:2px;text-transform:uppercase;margin-bottom:14px;
}
.section-title{font-size:34px;font-weight:800;color:var(--dark);line-height:1.35;margin-bottom:14px;letter-spacing:-.5px}
.section-subtitle{font-size:18px;color:var(--gray-500);margin-bottom:52px;max-width:640px}
.text-center .section-subtitle{margin-left:auto;margin-right:auto}

/* ---- 按钮 ---- */
.btn{
  padding:14px 36px;border-radius:var(--r);font-size:16px;font-weight:600;
  transition:all var(--t);cursor:pointer;border:none;
  display:inline-flex;align-items:center;gap:8px;white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-blue)}
.btn-white{background:#fff;color:var(--primary)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(0,0,0,.16)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.12)}
.btn-outline-b{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline-b:hover{background:var(--primary-light)}

/* ---- 导航 ---- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);
  background:rgba(255,255,255,.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid transparent;transition:all var(--t);
  display:flex;align-items:center;
}
.nav.scrolled{border-bottom-color:var(--gray-200);box-shadow:var(--shadow-sm)}
.nav .container{display:flex;align-items:center;justify-content:space-between;width:100%}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:800;color:var(--primary)}
.nav-logo .logo-mark{height:38px;width:auto;flex-shrink:0}
.nav-menu{display:flex;gap:36px}
.nav-cta{margin-left:0}
.nav-menu a{
  font-size:15px;color:var(--gray-700);font-weight:500;transition:color var(--t);
  position:relative;padding:4px 0;
}
.nav-menu a::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--primary);border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform var(--t);
}
.nav-menu a:hover,.nav-menu a.active{color:var(--primary)}
.nav-menu a:hover::after,.nav-menu a.active::after{transform:scaleX(1)}
.nav-cta{padding:9px 22px;background:var(--primary);color:#fff;border-radius:var(--r-sm);font-size:14px;font-weight:600;transition:all var(--t)}
.nav-cta:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-blue)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--dark);border-radius:2px;transition:all var(--t)}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* 移动端遮罩菜单 */
.nav-mobile{
  position:fixed;top:var(--nav-h);left:0;right:0;z-index:99;
  background:#fff;padding:16px 24px 28px;border-bottom:1px solid var(--gray-200);
  box-shadow:var(--shadow-lg);transform:translateY(-12px);opacity:0;pointer-events:none;transition:all var(--t);
}
.nav-mobile.open{transform:translateY(0);opacity:1;pointer-events:auto}
.nav-mobile a{display:block;padding:13px 4px;font-size:16px;font-weight:500;color:var(--gray-700);border-bottom:1px solid var(--gray-100)}
.nav-mobile a:last-of-type{border-bottom:none}
.nav-mobile a.active{color:var(--primary)}
.nav-mobile .btn{margin-top:16px;width:100%;justify-content:center;border-bottom:none;color:#fff}

/* ---- Lucide 图标通用样式 ---- */
.ic svg,.feature-icon svg,.pill-ic svg,.case-icon svg,.contact-icon svg,
.mv-icon svg,.value-icon svg,.icon svg,.adv-num svg{
  display:block;width:1em;height:1em;stroke:currentColor;fill:none;
  stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;
}
.ic svg{width:22px;height:22px;color:var(--primary)}
.feature-icon svg{width:28px;height:28px;color:var(--primary)}
.pill-ic svg{width:20px;height:20px;color:var(--primary)}
.case-icon svg{width:20px;height:20px;color:var(--primary)}
.contact-icon svg{width:30px;height:30px;color:var(--primary)}
.mv-icon svg{width:36px;height:36px;color:var(--primary)}
.value-icon svg{width:24px;height:24px;color:var(--primary)}
.icon svg{width:28px;height:28px;color:var(--primary)}
.adv-num svg{width:26px;height:26px;color:#fff}

/* ---- Hero（首页大图） ---- */
.hero{padding:150px 0 90px;background:var(--grad);color:#fff;text-align:center;position:relative;overflow:hidden}
.hero::before{
  content:"";position:absolute;top:-50%;left:-20%;width:140%;height:200%;
  background:radial-gradient(ellipse at 30% 40%,rgba(255,255,255,.1) 0%,transparent 50%),
             radial-gradient(ellipse at 70% 60%,rgba(255,255,255,.07) 0%,transparent 50%);
}
.hero .container{position:relative;z-index:1}
.hero h1{font-size:50px;font-weight:800;line-height:1.28;margin-bottom:22px;letter-spacing:-1px}
.hero h1 .sub{display:block;font-size:26px;font-weight:500;opacity:.92;margin-top:10px;letter-spacing:0}
.hero p{font-size:18px;max-width:680px;margin:0 auto 38px;opacity:.9;line-height:1.85}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* 页面级 Hero */
.page-hero{padding:130px 0 64px;background:var(--grad);color:#fff;text-align:center;position:relative;overflow:hidden}
.page-hero::before{
  content:"";position:absolute;top:-40%;left:-10%;width:120%;height:180%;
  background:radial-gradient(ellipse at 50% 30%,rgba(255,255,255,.08) 0%,transparent 55%);
}
.page-hero .container{position:relative;z-index:1}
.page-hero .tag{display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;margin-bottom:14px;opacity:.85}
.page-hero h1{font-size:40px;font-weight:800;margin-bottom:12px;letter-spacing:-.5px}
.page-hero .subtitle{font-size:18px;opacity:.92;margin-bottom:16px}
.page-hero .desc{font-size:16px;max-width:700px;margin:0 auto;opacity:.85;line-height:1.8}

/* ---- 通用卡片网格 ---- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}

/* 特性卡片 */
.feature-card{
  background:#fff;border:1px solid var(--gray-200);border-radius:var(--r-lg);
  padding:38px 30px;transition:all var(--t);position:relative;overflow:hidden;
}
.feature-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform var(--t);
}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary-light)}
.feature-card:hover::before{transform:scaleX(1)}
.feature-icon{
  width:56px;height:56px;border-radius:14px;background:var(--primary-light);
  display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:22px;
  transition:transform var(--t);
}
.feature-card:hover .feature-icon{transform:scale(1.08) rotate(-4deg)}
.feature-card h3{font-size:20px;font-weight:700;margin-bottom:8px}
.feature-card .sub{font-size:14px;color:var(--primary);font-weight:600;margin-bottom:14px}
.feature-card p{font-size:15px;color:var(--gray-500);line-height:1.85}

/* 用例卡片 */
.usecase-card{
  background:#fff;border-radius:var(--r-lg);padding:38px 30px;
  border-top:4px solid var(--primary);box-shadow:var(--shadow);transition:all var(--t);
}
.usecase-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.usecase-card h3{font-size:18px;font-weight:700;margin-bottom:6px}
.usecase-card .tag{font-size:13px;color:var(--gray-500);margin-bottom:16px}
.usecase-card p{font-size:15px;color:var(--gray-500);line-height:1.85}

/* 优势卡片 */
.adv-card{text-align:center;padding:40px 26px}
.adv-num{
  width:64px;height:64px;border-radius:50%;background:var(--grad);color:#fff;
  font-size:24px;font-weight:800;display:flex;align-items:center;justify-content:center;
  margin:0 auto 22px;box-shadow:var(--shadow-blue);
}
.adv-card h3{font-size:20px;font-weight:700;margin-bottom:8px}
.adv-card .sub{font-size:14px;color:var(--primary);font-weight:600;margin-bottom:14px}
.adv-card p{font-size:15px;color:var(--gray-500);line-height:1.85}

/* ---- 数据统计条 ---- */
.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-item{text-align:center}
.stat-num{font-size:42px;font-weight:800;color:var(--primary);line-height:1;letter-spacing:-1px}
.stat-num .unit{font-size:22px;font-weight:700}
.stat-label{font-size:15px;color:var(--gray-500);margin-top:10px}

/* ---- CTA 横幅 ---- */
.cta-banner{background:var(--grad);color:#fff;text-align:center;padding:72px 0;position:relative;overflow:hidden}
.cta-banner::before{
  content:"";position:absolute;top:-30%;left:0;right:0;height:160%;
  background:radial-gradient(ellipse at 50% 50%,rgba(255,255,255,.06) 0%,transparent 60%);
}
.cta-banner .container{position:relative;z-index:1}
.cta-banner h2{font-size:30px;font-weight:800;margin-bottom:14px;letter-spacing:-.5px}
.cta-banner p{font-size:16px;opacity:.9;margin-bottom:30px}

/* ---- 页脚 ---- */
.footer{background:var(--dark);color:#94a3b8;padding:54px 0 34px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:48px;margin-bottom:38px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer p,.footer a{font-size:14px;line-height:2;color:#94a3b8}
.footer a{transition:color var(--t)}
.footer a:hover{color:#fff}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid #1e293b;font-size:13px}
.footer-bottom .beian-link{display:inline-flex;align-items:center;gap:4px;vertical-align:middle}
.footer-bottom .beian-link img{width:16px;height:16px;vertical-align:middle}
.footer-bottom .beian-link span{vertical-align:middle}

/* ---- 回到顶部 ---- */
.back-top{
  position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;
  background:var(--primary);color:#fff;border:none;cursor:pointer;z-index:90;
  display:flex;align-items:center;justify-content:center;font-size:20px;
  box-shadow:var(--shadow-blue);opacity:0;pointer-events:none;transform:translateY(16px);transition:all var(--t);
}
.back-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.back-top:hover{background:var(--primary-dark);transform:translateY(-3px)}

/* ---- 滚动入场动画 ---- */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.hero,.page-hero{scroll-behavior:auto}}

/* ---- 响应式 ---- */
@media(max-width:980px){
  .grid-3{grid-template-columns:1fr 1fr}
  .stats-bar{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  :root{--nav-h:60px}
  .nav-menu{display:none}
  .nav-toggle{display:flex;margin-left:auto}
  .nav-cta{display:none}
  .hero{padding:120px 0 70px}
  .hero h1{font-size:32px}.hero h1 .sub{font-size:20px}
  .hero p{font-size:16px}
  .page-hero{padding:110px 0 52px}
  .page-hero h1{font-size:28px}.page-hero .desc{font-size:15px}
  .section{padding:56px 0}
  .section-title{font-size:26px}.section-subtitle{font-size:16px;margin-bottom:36px}
  .grid-3,.grid-2,.stats-bar{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .cta-banner h2{font-size:24px}
  .btn{padding:12px 28px;font-size:15px}
}