:root{--brand-red:#ed1c24;--brand-red-dark:#c4121a;--text-title:#222222;--text-strong:#4a4a4a;--text-body:#666666;--text-muted:#999999;--line-light:#e0e0e0;--bg-light:#f5f5f5;--bg-white:#ffffff;--font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;--radius-sm:6px;--radius-md:12px;--radius-lg:20px;--container:1120px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);color:var(--text-body);background:var(--bg-white);line-height:1.7;-webkit-font-smoothing:antialiased}h1,h2,h3,h4{color:var(--text-title);font-weight:700;line-height:1.3}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}.container{max-width:var(--container);margin:0 auto;padding:0 24px}.btn-primary{display:inline-block;background:var(--brand-red);color:#fff;font-weight:600;padding:12px 28px;border-radius:999px;transition:background .2s ease;border:none;cursor:pointer}.btn-primary:hover{background:var(--brand-red-dark)}.btn-ghost{display:inline-block;background:transparent;color:var(--brand-red);font-weight:600;padding:12px 28px;border-radius:999px;border:2px solid var(--brand-red);transition:all .2s ease}.btn-ghost:hover{background:var(--brand-red);color:#fff}.section-title{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;text-align:center;color:var(--text-title)}.section-sub{text-align:center;color:var(--text-muted);margin-top:8px;font-size:1rem}:focus-visible{outline:2px solid var(--brand-red);outline-offset:2px}.kf-float{position:fixed;right:24px;bottom:24px;z-index:999;border:none;cursor:pointer;font-family:inherit;display:inline-flex;align-items:center;gap:8px;background:var(--brand-red);color:#fff;font-size:.95rem;font-weight:600;padding:12px 22px;border-radius:999px;box-shadow:0 6px 20px rgba(237,28,36,.35);transition:background .2s ease,transform .2s ease}.kf-float:hover{background:var(--brand-red-dark);color:#fff;transform:translateY(-2px)}.kf-float-icon{display:inline-flex;align-items:center;line-height:1}@media (max-width:768px){.container{padding:0 16px}.kf-float{right:16px;bottom:16px;padding:10px 18px;font-size:.9rem}}