/* 首屏 Critical CSS — 仅 Hero + Header，完整样式见 home.css */
:root{--color-hero-bg-start:#1A1D29;--color-hero-bg-end:#2D3548;--color-hero-text:#FFF;--color-hero-text-dim:rgba(255,255,255,.72);--color-accent:#3D7CFF;--color-bg-page:#F6F7F9;--color-text-primary:#1A1D29;--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font-sans);font-size:15px;line-height:1.65;color:var(--color-text-primary);background:var(--color-bg-page);min-width:320px;overflow-x:hidden;-webkit-font-smoothing:antialiased}
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(26,29,41,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.06)}
.header-inner,.w1200{max-width:1200px;margin:0 auto;padding:0 24px}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:600;font-size:16px}
.nav-logo img{height:32px;width:auto}
.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:120px 0 80px;background:linear-gradient(135deg,var(--color-hero-bg-start) 0%,var(--color-hero-bg-end) 100%);color:var(--color-hero-text);overflow:hidden}
.hero-content{position:relative;z-index:2;max-width:640px}
.hero-title{font-size:clamp(28px,4vw,48px);font-weight:700;line-height:1.25;color:var(--color-hero-text);margin-bottom:20px}
.hero-subtitle{font-size:17px;color:var(--color-hero-text-dim);margin-bottom:28px;max-width:520px}
.hero-trust{display:flex;flex-wrap:wrap;gap:16px 24px;font-size:14px;color:var(--color-hero-text-dim);margin-bottom:32px}
#particles-canvas{position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.35}