/* ===== 基础变量 ===== */
:root{
    --c-bg:#f7fbff;
    --c-surface:#ffffff;
    --c-ink:#0f172a;
    --c-ink-soft:#475569;
    --c-mute:#94a3b8;
    --c-line:#e6eef7;
    --c-brand:#0ea5e9;      /* 科技蓝 */
    --c-brand-2:#22d3ee;    /* 青蓝 */
    --c-brand-3:#3b82f6;    /* 电蓝 */
    --c-accent:#10b981;     /* 财务绿 */
    --grad:linear-gradient(135deg,#0ea5e9 0%,#22d3ee 50%,#3b82f6 100%);
    --grad-soft:linear-gradient(135deg,#e0f2fe 0%,#ecfeff 50%,#eef2ff 100%);
    --shadow-sm:0 4px 16px rgba(15,40,80,.06);
    --shadow-md:0 16px 40px rgba(15,40,80,.10);
    --shadow-lg:0 28px 70px rgba(15,40,80,.16);
    --radius:18px;
    --radius-sm:12px;
    --maxw:1180px;
}

/* ===== 重置 ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
    font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",system-ui,-apple-system,sans-serif;
    background:var(--c-bg);
    color:var(--c-ink);
    line-height:1.65;
    overflow-x:hidden;
    -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ===== 通用按钮 ===== */
.btn{
    display:inline-flex;align-items:center;justify-content:center;
    padding:13px 26px;border-radius:999px;font-weight:600;font-size:15px;
    transition:transform .25s ease,box-shadow .25s ease,background .25s ease;
    white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 26px rgba(14,165,233,.35)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(14,165,233,.45)}
.btn-ghost{background:rgba(15,23,42,.04);color:var(--c-ink);border:1.5px solid var(--c-line)}
.btn-ghost:hover{border-color:var(--c-brand);color:var(--c-brand);transform:translateY(-3px)}
.btn-block{width:100%}

/* ===== 顶部导航 ===== */
.header{
    position:fixed;top:0;left:0;right:0;z-index:100;
    background:rgba(255,255,255,.72);
    backdrop-filter:saturate(180%) blur(14px);
    -webkit-backdrop-filter:saturate(180%) blur(14px);
    border-bottom:1px solid transparent;
    transition:background .3s,border-color .3s,box-shadow .3s;
}
.header.scrolled{background:rgba(255,255,255,.9);border-color:var(--c-line);box-shadow:var(--shadow-sm)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:66px}

.logo{display:inline-flex;align-items:center;gap:10px;font-weight:700}
.logo-mark{display:block;flex-shrink:0;width:148px;height:50px;border-radius:8px}
.logo-text{display:flex;flex-direction:column;line-height:1.05;font-size:17px}
.logo-text small{font-size:10px;letter-spacing:2px;color:var(--c-mute);font-weight:600}

.nav{display:flex;align-items:center;gap:6px}
.nav-link{padding:9px 14px;border-radius:999px;font-size:14.5px;font-weight:500;color:var(--c-ink-soft);transition:color .25s,background .25s}
.nav-link:hover{color:var(--c-brand)}
.nav-link.active{color:var(--c-brand);background:rgba(14,165,233,.08)}
.nav-cta{background:var(--c-ink);color:#fff;margin-left:6px}
.nav-cta:hover{background:var(--c-brand);color:#fff}

.menu-toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.menu-toggle span{width:22px;height:2px;background:var(--c-ink);border-radius:2px;transition:transform .3s,opacity .3s}
.menu-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{position:relative;padding:140px 0 90px;overflow:hidden}
.hero-bg{
    position:absolute;inset:0;z-index:-2;
    background:
        radial-gradient(1100px 520px at 85% -10%,rgba(34,211,238,.22),transparent 60%),
        radial-gradient(900px 480px at 5% 10%,rgba(59,130,246,.20),transparent 55%),
        linear-gradient(180deg,#eef7ff 0%,#f7fbff 100%);
}
.hero-grid{
    position:absolute;inset:0;z-index:-2;opacity:.5;
    background-image:linear-gradient(rgba(14,165,233,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(14,165,233,.06) 1px,transparent 1px);
    background-size:46px 46px;
    -webkit-mask-image:radial-gradient(circle at 60% 30%,#000 0%,transparent 78%);
    mask-image:radial-gradient(circle at 60% 30%,#000 0%,transparent 78%);
}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:50px}

.badge{
    display:inline-flex;align-items:center;gap:8px;
    padding:7px 14px;border-radius:999px;font-size:12.5px;font-weight:600;
    color:var(--c-brand);background:rgba(14,165,233,.1);border:1px solid rgba(14,165,233,.18);
}
.hero-copy h1{font-size:clamp(30px,4.6vw,50px);line-height:1.18;font-weight:800;letter-spacing:-.5px;margin:18px 0 16px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-copy p{font-size:17px;color:var(--c-ink-soft);max-width:520px}
.hero-actions{display:flex;gap:14px;margin:30px 0 38px;flex-wrap:wrap}
.hero-stats{display:flex;gap:34px;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:26px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats span{font-size:13px;color:var(--c-mute)}

.hero-visual{position:relative;display:grid;place-items:center;min-height:360px}
.hero-visual img{
    width:100%;max-width:430px;border-radius:26px;box-shadow:var(--shadow-lg);
    border:5px solid #fff;position:relative;z-index:2;
}
.orb{position:absolute;border-radius:50%;filter:blur(8px);z-index:1}
.orb-a{width:230px;height:230px;background:radial-gradient(circle at 30% 30%,rgba(34,211,238,.55),transparent 70%);top:-20px;right:0}
.orb-b{width:200px;height:200px;background:radial-gradient(circle at 60% 60%,rgba(59,130,246,.45),transparent 70%);bottom:-30px;left:-10px}

/* ===== 通用区块 ===== */
.section{padding:90px 0}
.section-alt{background:linear-gradient(180deg,#f1f8ff 0%,#f7fbff 100%)}
.section-head{max-width:680px;margin:0 auto 54px;text-align:center}
.eyebrow{display:inline-block;font-size:12px;letter-spacing:3px;font-weight:700;color:var(--c-brand);margin-bottom:12px}
.section-head h2{font-size:clamp(26px,3.4vw,38px);font-weight:800;letter-spacing:-.3px;margin-bottom:12px}
.section-head p{color:var(--c-ink-soft);font-size:16px}

/* ===== 卡片网格 ===== */
.grid.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
    position:relative;background:var(--c-surface);border:1px solid var(--c-line);
    border-radius:var(--radius);padding:30px 26px;transition:transform .3s,box-shadow .3s,border-color .3s;
    overflow:hidden;
}
.card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .35s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:transparent}
.card:hover::before{transform:scaleX(1)}
.card-icon{
    width:54px;height:54px;border-radius:14px;display:grid;place-items:center;margin-bottom:18px;
    background:var(--grad-soft);color:var(--c-brand);
}
.card h3{font-size:19px;font-weight:700;margin-bottom:8px}
.card p{color:var(--c-ink-soft);font-size:14.5px}
.card-hl{background:linear-gradient(180deg,#0f172a,#1e293b);border-color:#1e293b;color:#e2e8f0}
.card-hl .card-icon{background:rgba(255,255,255,.1);color:var(--c-brand-2)}
.card-hl h3{color:#fff}
.card-hl p{color:#94a3b8}
.card-link{display:inline-block;margin-top:14px;font-weight:600;color:var(--c-brand-2)}
.card-link:hover{text-decoration:underline}

/* ===== 产品区 ===== */
.product{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:56px}
.product-visual{position:relative;display:grid;place-items:center;min-height:420px}
.product-illu{
    position:absolute;inset:auto 0 0 0/0 0;height:260px;border-radius:30px;z-index:0;
    background:var(--grad);opacity:.16;filter:blur(20px);
}
.phone{
    position:relative;z-index:2;width:248px;height:486px;border-radius:38px;
    background:linear-gradient(180deg,#1e293b,#0f172a);padding:12px;
    box-shadow:0 30px 60px rgba(15,40,80,.4);
}
.phone-screen{width:100%;height:100%;border-radius:28px;background:#f1f8ff;overflow:hidden;display:flex;flex-direction:column;padding:14px 16px}
.ps-status{display:flex;justify-content:space-between;font-size:11px;font-weight:700;color:#64748b;margin-bottom:8px}
.ps-title{font-weight:800;font-size:16px;text-align:center;color:var(--c-ink)}
.ps-balance{margin:10px 0;background:var(--grad);border-radius:16px;padding:14px;color:#fff}
.ps-balance small{font-size:11px;opacity:.85}
.ps-balance b{display:block;font-size:22px;margin-top:2px}
.ps-bars{display:flex;align-items:flex-end;gap:6px;height:64px;margin:12px 0;padding:6px;background:#fff;border-radius:12px}
.ps-bars span{flex:1;height:var(--h);background:var(--grad);border-radius:4px;opacity:.85}
.ps-list{display:flex;flex-direction:column;gap:8px;font-size:12.5px;font-weight:600;color:var(--c-ink-soft)}
.ps-list li{display:flex;align-items:center;gap:8px;background:#fff;padding:7px 10px;border-radius:8px}
.dot{width:8px;height:8px;border-radius:50%}
.c1{background:#0ea5e9}.c2{background:#22d3ee}.c3{background:#3b82f6}

.product-copy .lead{font-size:16.5px;color:var(--c-ink-soft);margin:14px 0 26px}
.features{display:flex;flex-direction:column;gap:18px;margin-bottom:32px}
.features li{display:flex;gap:14px;align-items:flex-start}
.fi{flex-shrink:0;width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:rgba(16,185,129,.12);color:var(--c-accent)}
.features b{font-size:15.5px}
.features p{font-size:13.5px;color:var(--c-mute)}
.product-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ===== 关于我们 ===== */
.about{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-copy h2{font-size:clamp(26px,3.4vw,38px);font-weight:800;margin:8px 0 16px}
.about-copy p{color:var(--c-ink-soft);margin-bottom:14px;font-size:15.5px}
.about-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.about-tags span{padding:7px 14px;border-radius:999px;font-size:13px;font-weight:600;background:var(--c-surface);border:1px solid var(--c-line);color:var(--c-ink-soft)}
.about-visual{display:grid;place-items:center}
.stat-box{display:grid;grid-template-columns:1fr 1fr;gap:16px;width:100%}
.stat{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--radius);padding:24px;transition:transform .3s,box-shadow .3s}
.stat:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm)}
.stat b{display:block;font-size:18px;font-weight:800;margin-bottom:4px}
.stat span{font-size:13.5px;color:var(--c-mute)}

/* ===== 联系我们 ===== */
.contact-card{display:grid;grid-template-columns:1fr 1fr;gap:0;background:var(--c-surface);border:1px solid var(--c-line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow-md)}
.contact-left{padding:42px 40px;background:linear-gradient(180deg,#0f172a,#15233b);color:#e2e8f0}
.contact-left h2{font-size:clamp(24px,3vw,32px);font-weight:800;margin:8px 0 12px;color:#fff}
.contact-left p{color:#94a3b8;margin-bottom:28px}
.contact-list{display:flex;flex-direction:column;gap:20px}
.contact-list li{display:flex;gap:14px;align-items:center}
.ci{flex-shrink:0;width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:rgba(255,255,255,.08);color:var(--c-brand-2)}
.contact-list small{display:block;font-size:12px;color:#94a3b8}
.contact-list a,.contact-list span{font-size:16px;font-weight:600;color:#fff}
.contact-form{padding:42px 40px;display:flex;flex-direction:column;gap:18px}
.field{display:flex;flex-direction:column;gap:7px}
.field label{font-size:13px;font-weight:600;color:var(--c-ink-soft)}
.field input,.field textarea{
    width:100%;padding:12px 14px;border:1.5px solid var(--c-line);border-radius:10px;
    font:inherit;font-size:15px;background:#fff;transition:border-color .25s,box-shadow .25s;resize:vertical;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--c-brand);box-shadow:0 0 0 3px rgba(14,165,233,.12)}
.form-tip{font-size:13.5px;min-height:18px;color:var(--c-accent)}
.form-tip.error{color:#ef4444}

/* ===== 页脚 ===== */
.footer{background:#0b1220;color:#94a3b8;padding:46px 0 26px}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;padding-bottom:24px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand .logo-mark{width:28px;height:28px}
.footer-brand b{display:block;color:#fff;font-size:15px}
.footer-brand small{font-size:12px;color:#64748b}
.footer-nav{display:flex;gap:20px;flex-wrap:wrap}
.footer-nav a{font-size:13.5px;color:#94a3b8;transition:color .25s}
.footer-nav a:hover{color:var(--c-brand-2)}
.footer-bottom{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;padding-top:22px;font-size:12.5px;color:#64748b}
.footer-bottom a{color:#64748b}
.footer-bottom a:hover{color:var(--c-brand-2)}

/* ===== 返回顶部 ===== */
.to-top{
    position:fixed;right:22px;bottom:22px;z-index:90;
    width:46px;height:46px;border-radius:50%;display:grid;place-items:center;
    background:var(--c-ink);color:#fff;box-shadow:var(--shadow-md);
    opacity:0;visibility:hidden;transform:translateY(14px);transition:all .3s;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--c-brand)}

/* ===== 滚动入场动画 ===== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* ===== 响应式：平板 ===== */
@media (max-width:900px){
    .hero-inner,.product,.about{grid-template-columns:1fr;gap:40px}
    .hero{padding:120px 0 70px}
    .hero-visual{order:-1;min-height:300px}
    .hero-visual img{max-width:340px}
    .grid.cards{grid-template-columns:repeat(2,1fr)}
    .stat-box{grid-template-columns:1fr 1fr}
    .contact-card{grid-template-columns:1fr}
    .contact-left,.contact-form{padding:34px 28px}
    .hero-stats{gap:24px}
    .section{padding:70px 0}
}

/* ===== 响应式：手机 ===== */
@media (max-width:600px){
    .nav{
        position:fixed;top:66px;left:0;right:0;
        flex-direction:column;align-items:stretch;gap:0;
        background:rgba(255,255,255,.98);backdrop-filter:blur(16px);
        padding:10px 20px 18px;border-bottom:1px solid var(--c-line);
        box-shadow:var(--shadow-md);
        transform:translateY(-130%);transition:transform .35s ease;visibility:hidden;
    }
    .nav.open{transform:translateY(0);visibility:visible}
    .nav-link{padding:13px 14px;font-size:16px;border-radius:10px}
    .nav-link.active{background:rgba(14,165,233,.1)}
    .nav-cta{margin:8px 0 0;text-align:center}
    .menu-toggle{display:flex}

    .grid.cards{grid-template-columns:1fr}
    .stat-box{grid-template-columns:1fr}
    .hero-stats{gap:18px}
    .hero-stats b{font-size:22px}
    .hero-copy p{font-size:15px}
    .btn{padding:12px 22px;font-size:14.5px}
    .contact-left,.contact-form{padding:28px 22px}
    .footer-inner{flex-direction:column;align-items:flex-start}
    .footer-bottom{flex-direction:column;gap:6px}
    .product-visual{min-height:380px}
    .to-top{right:16px;bottom:16px;width:42px;height:42px}
}