:root{
    --blue:#4f7cf6;          /* 鲜明的主强调色，只用在按钮/激活态/关键点缀 */
    --blue-2:#6e8cf7;
    --purple:#7d77f0;
    --grad:linear-gradient(135deg,#4f7cf6,#7a7bf2);
    --ink:#1d2a4d;           /* 深藏蓝标题，强对比=清爽，而非发暗 */
    --ink-2:#6b7693;         /* 正文灰 */
    --bg:#f7faff;
    --card:#ffffff;
    --line:rgba(79,124,246,.13);
    --radius:18px;
    --shadow:0 20px 48px -24px rgba(79,124,246,.38);
    --shadow-sm:0 10px 30px -18px rgba(29,42,77,.16);
    --max:1160px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
    font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;
    color:var(--ink);
    background:#fff;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}

/* ===== Buttons ===== */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:6px;
    border:none;cursor:pointer;font-size:15px;font-weight:600;
    padding:11px 22px;border-radius:999px;transition:.25s ease;white-space:nowrap;
    font-family:inherit;
}
.btn-sm{padding:8px 18px;font-size:14px}
.btn-lg{padding:15px 32px;font-size:16px}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;box-shadow:0 12px 28px -10px rgba(47,107,255,.7)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 34px -10px rgba(47,107,255,.8)}
.btn-ghost{color:var(--ink);background:transparent}
.btn-ghost:hover{color:var(--blue)}
.btn-light{background:#fff;color:var(--blue)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 18px 34px -12px rgba(0,0,0,.3)}
.btn-text{background:transparent;color:var(--blue);padding:11px 8px}
.btn-text:hover{opacity:.75}

/* ===== Header ===== */
.site-header{
    position:fixed;top:0;left:0;right:0;z-index:50;
    transition:.3s ease;
}
.site-header.scrolled{
    background:rgba(255,255,255,.85);
    backdrop-filter:blur(14px);
    box-shadow:0 6px 24px -16px rgba(20,34,61,.4);
}
.nav-inner{display:flex;align-items:center;height:72px;gap:32px}
.brand{display:flex;align-items:center;gap:9px}
.brand-logo{display:flex;filter:drop-shadow(0 4px 8px rgba(47,107,255,.4))}
.brand-name{font-size:21px;font-weight:800;letter-spacing:.5px;background:linear-gradient(135deg,var(--blue),var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent}
.brand-name.light{color:#fff;background:none;-webkit-text-fill-color:#fff}
.nav-menu{display:flex;gap:30px;margin-left:18px}
.nav-menu a{font-size:15px;font-weight:500;color:var(--ink);position:relative;padding:4px 0}
.nav-menu a:hover{color:var(--blue)}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:-4px;width:0;height:2px;background:var(--blue);transition:.25s;border-radius:2px}
.nav-menu a:hover::after{width:100%}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;padding:150px 0 100px;
    background:
        radial-gradient(1300px 720px at 50% -18%,#cadcff 0%,rgba(202,220,255,0) 62%),
        linear-gradient(180deg,#e3edff 0%,#eef4ff 42%,#ffffff 100%);
}
.hero-bg{position:absolute;inset:0;z-index:0;pointer-events:none}
.blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:.35}
.blob-1{width:360px;height:360px;background:#aecaff;top:-60px;right:8%}
.blob-2{width:300px;height:300px;background:#cdc4ff;top:140px;right:34%}
.blob-3{width:240px;height:240px;background:#c2d8ff;bottom:-40px;left:10%}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}

.hero-tabs{display:inline-flex;gap:6px;background:rgba(255,255,255,.7);border:1px solid var(--line);padding:6px;border-radius:999px;margin-bottom:30px;backdrop-filter:blur(8px)}
.hero-tabs .tab{border:none;background:transparent;cursor:pointer;font-family:inherit;font-size:14px;font-weight:600;color:var(--ink-2);padding:8px 18px;border-radius:999px;transition:.25s}
.hero-tabs .tab.is-active{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;box-shadow:0 8px 18px -8px rgba(47,107,255,.7)}

.hero-slides{position:relative;min-height:170px}
.hero-slide{position:absolute;inset:0;opacity:0;transform:translateY(14px);transition:.45s ease;pointer-events:none}
.hero-slide.is-active{position:relative;opacity:1;transform:none;pointer-events:auto}
.hero-slide h1{font-size:46px;line-height:1.18;font-weight:800;letter-spacing:.5px}
.hero-slide p{margin-top:18px;font-size:16px;color:var(--ink-2);max-width:440px}

.hero-cta{display:flex;align-items:center;gap:14px;margin-top:32px;flex-wrap:wrap}
.hero-trust{display:flex;align-items:center;gap:14px;margin-top:26px;font-size:14px;color:var(--ink-2)}
.hero-trust b{color:var(--ink)}
.hero-trust .dot{width:5px;height:5px;border-radius:50%;background:var(--ink-2);opacity:.4}

/* hero visual */
.hero-visual{position:relative;height:440px}
.float-card{position:absolute;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.7);border-radius:16px;box-shadow:var(--shadow);padding:16px 18px;animation:floaty 6s ease-in-out infinite}
.float-card strong{display:block;font-size:14px}
.float-card small{display:block;font-size:12px;color:var(--ink-2);margin-top:2px}
.fc-ico{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;margin-bottom:8px}
.fc-ico svg{width:22px;height:22px}
.ico-blue{background:linear-gradient(135deg,#e6eeff,#d4e0ff);color:#4f7cf6}
.ico-purple{background:linear-gradient(135deg,#ece7ff,#ddd4ff);color:#7a6ef0}
.ico-green{background:linear-gradient(135deg,#e0f7ec,#caf0da);color:#21ab6f}

.fc-main{left:50%;top:42%;transform:translate(-50%,-50%);width:280px;z-index:3;animation-delay:.2s}
.fc-head{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.fc-bot{width:42px;height:42px;display:flex;align-items:center;justify-content:center;background:var(--grad);border-radius:12px;color:#fff}
.fc-bot svg{width:24px;height:24px}
.fc-line{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-2);padding:7px 0;border-top:1px dashed var(--line)}
.fc-line i{width:8px;height:8px;border-radius:50%;background:#cdd8f0}
.fc-line.ok{color:#1aa564;font-weight:600}
.fc-line.ok i{background:#1aa564}
.fc-a{top:2%;left:0;animation-delay:0s}
.fc-b{top:8%;right:0;animation-delay:1.2s}
.fc-c{bottom:4%;right:6%;animation-delay:.6s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
.fc-main{animation-name:floaty-center}
@keyframes floaty-center{0%,100%{transform:translate(-50%,-50%)}50%{transform:translate(-50%,calc(-50% - 12px))}}

/* ===== Sections ===== */
.section{padding:90px 0}
.section-head{text-align:center;max-width:680px;margin:0 auto 54px}
.section-head h2{font-size:30px;font-weight:800;letter-spacing:.5px}
.section-head h3{font-size:30px;font-weight:800;letter-spacing:.5px;margin-top:4px}
.section-head h2+h3{color:var(--ink)}
.section-head p{margin-top:14px;color:var(--ink-2);font-size:16px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;color:var(--blue);letter-spacing:1px;text-transform:uppercase;margin-bottom:12px}

/* advantages */
.advantages{background:linear-gradient(180deg,#fff 0%,#f4f7ff 100%)}
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.adv-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px 28px;box-shadow:var(--shadow-sm);transition:.3s}
.adv-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.adv-ico{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:16px;margin-bottom:18px}
.adv-ico svg{width:28px;height:28px}
.adv-card h4{font-size:19px;font-weight:700;margin-bottom:10px}
.adv-card p{color:var(--ink-2);font-size:15px}

/* flow */
.flow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.flow-step{position:relative;padding:30px 24px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);transition:.3s}
.flow-step:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.flow-num{font-size:34px;font-weight:800;background:linear-gradient(135deg,var(--blue),var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent}
.flow-step h4{font-size:18px;margin:10px 0 8px}
.flow-step p{color:var(--ink-2);font-size:14px}

/* feature split */
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.feature-text h3{font-size:28px;font-weight:800;margin-bottom:14px}
.feature-text p{color:var(--ink-2);margin-bottom:18px}
.feature-list{list-style:none;margin-bottom:26px}
.feature-list li{position:relative;padding-left:28px;margin-bottom:12px;color:var(--ink)}
.feature-list li::before{content:"✓";position:absolute;left:0;top:0;width:18px;height:18px;font-size:11px;display:flex;align-items:center;justify-content:center;color:#fff;background:linear-gradient(135deg,var(--blue),var(--purple));border-radius:50%}
.feature-art{display:flex;justify-content:center}
.art-panel{width:100%;max-width:420px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:var(--shadow);color:var(--ink)}
.art-bar{display:flex;align-items:flex-end;gap:12px;height:160px;padding:16px;background:#f2f7ff;border-radius:16px}
.art-bar span{flex:1;height:var(--h);background:var(--grad);border-radius:6px 6px 0 0;animation:grow 1s ease}
@keyframes grow{from{height:0}}
.art-tags{display:flex;gap:12px;margin-top:18px}
.art-tags span{flex:1;background:#f2f7ff;border-radius:12px;padding:12px 14px;font-size:13px;color:var(--ink-2)}
.art-tags b{display:block;font-size:20px;font-weight:800;margin-top:2px;color:var(--ink)}

/* stats */
.stats{background:linear-gradient(180deg,#f4f7ff,#fff);padding:70px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat b{display:block;font-size:42px;font-weight:800;background:linear-gradient(135deg,var(--blue),var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{color:var(--ink-2);font-size:15px}

/* cta band */
.cta-band{background:transparent;color:var(--ink);max-width:var(--max);margin:0 auto;padding:10px 24px 80px}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0;flex-wrap:wrap}
.cta-band h3{font-size:28px;font-weight:800}
.cta-band p{color:var(--ink-2);margin-top:8px}

/* footer */
.site-footer{background:#222a44;color:#b6bfd8;padding:60px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.footer-brand p{margin-top:14px;font-size:14px;max-width:280px;color:#8595b8}
.footer-col h5{color:#fff;font-size:15px;margin-bottom:16px}
.footer-col a{display:block;font-size:14px;margin-bottom:10px;color:#aebbd6;transition:.2s}
.footer-col a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:22px;font-size:13px;color:#7585a8}

/* reveal animation */
.reveal{opacity:0;transform:translateY(26px);transition:.7s cubic-bezier(.2,.7,.2,1);transition-delay:var(--d,0s)}
.reveal.in{opacity:1;transform:none}

/* ===== Responsive ===== */
@media(max-width:900px){
    .hero-inner{grid-template-columns:1fr}
    .hero-visual{height:360px;margin-top:30px}
    .adv-grid,.flow-grid,.stats-grid{grid-template-columns:1fr 1fr}
    .feature-row{grid-template-columns:1fr;gap:30px}
    .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
    .nav-menu{position:fixed;top:72px;left:0;right:0;flex-direction:column;background:#fff;padding:18px 24px;gap:14px;box-shadow:var(--shadow-sm);transform:translateY(-130%);transition:.35s;opacity:0}
    .nav-menu.open{transform:none;opacity:1}
    .nav-toggle{display:flex}
    .nav-actions .btn-ghost{display:none}
    .hero{padding:120px 0 60px}
    .hero-slide h1{font-size:34px}
    .adv-grid,.flow-grid,.stats-grid,.footer-grid{grid-template-columns:1fr}
    .section{padding:64px 0}
    .section-head h2,.section-head h3{font-size:24px}
    .cta-inner{padding:36px 28px;flex-direction:column;align-items:flex-start}
}