:root{--brand:#dc3545;--brand-dark:#b42332;--ink:#17181b;--muted:#68707d;--soft:#f5f6f8;--line:#e6e8ed;--surface:#fff;--shadow:0 18px 50px rgba(20,24,32,.09)}
*{box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--soft)}
.brand-gradient{background:linear-gradient(135deg,var(--brand),var(--brand-dark))}.brand-text{color:var(--brand)!important}.surface-card{border:0;border-radius:20px;box-shadow:var(--shadow)}
.auth-shell{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr;background:#fff}.auth-side{padding:56px;display:flex;flex-direction:column;justify-content:space-between;background:radial-gradient(circle at 15% 20%,rgba(255,255,255,.18),transparent 28%),linear-gradient(145deg,#dc3545,#991c2b);color:#fff}.auth-side h1{font-size:clamp(40px,5vw,68px);line-height:1.03;letter-spacing:-2px;max-width:650px}.auth-side p{max-width:560px;font-size:17px;line-height:1.75;color:rgba(255,255,255,.82)}.auth-main{display:flex;align-items:center;justify-content:center;padding:42px 24px}.auth-card{width:100%;max-width:520px}.auth-card .form-control{min-height:50px;border-radius:12px}.auth-card .btn{min-height:50px;border-radius:12px;font-weight:700}.auth-brand{font-weight:800;letter-spacing:-.5px}.auth-note{font-size:13px;color:var(--muted)}
.site-topbar{background:#fff;border-bottom:1px solid var(--line)}.site-topbar .navbar-brand{font-weight:800}.page-wrap{max-width:1180px;margin:0 auto;padding:48px 22px}.soft-section{background:var(--soft)}
@media(max-width:900px){.auth-shell{grid-template-columns:1fr}.auth-side{display:none}.auth-main{min-height:100vh}}