.auth-bg{min-height:100vh;background:radial-gradient(ellipse 80% 60% at 50% -20%,rgba(100,160,255,.12) 0,transparent 70%),radial-gradient(ellipse 60% 50% at 80% 80%,rgba(130,90,255,.08) 0,transparent 60%),var(--bg-base);display:flex;align-items:center;justify-content:center;padding:24px;font-family:Inter,system-ui,sans-serif}.auth-card{width:100%;max-width:440px;background:var(--bg-card);border:1px solid var(--border);border-radius:18px;padding:36px;box-shadow:0 24px 80px rgba(0,0,0,.4),inset 0 0 0 1px hsla(0,0%,100%,.04)}.auth-logo{text-align:center;margin-bottom:28px}.auth-logo-mark{width:52px;height:52px;background:linear-gradient(135deg,var(--accent),#6060ff);border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:24px;margin:0 auto 12px;box-shadow:0 8px 24px rgba(100,130,255,.35)}.auth-title{font-size:22px;font-weight:700;color:var(--text-primary);margin-bottom:4px}.auth-subtitle{font-size:13px;color:var(--text-muted)}.auth-form{gap:14px}.auth-field,.auth-form{display:flex;flex-direction:column}.auth-field{gap:5px}.auth-label{font-size:12px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.4px}.auth-input{background:var(--bg-input,var(--bg-hover));border:1px solid var(--border);border-radius:9px;padding:11px 14px;font-size:14px;color:var(--text-primary);outline:none;width:100%;box-sizing:border-box;transition:border-color .15s;font-family:inherit}.auth-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(100,130,255,.15)}.auth-input::placeholder{color:var(--text-muted)}.auth-btn{width:100%;padding:13px;background:linear-gradient(135deg,var(--accent),#5545ee);border:none;border-radius:10px;font-size:14px;font-weight:700;color:#fff;cursor:pointer;margin-top:6px;transition:opacity .15s,transform .1s;letter-spacing:.3px}.auth-btn:hover{opacity:.9;transform:translateY(-1px)}.auth-btn:active{transform:translateY(0)}.auth-btn:disabled{opacity:.5;cursor:not-allowed}.auth-divider{display:flex;align-items:center;gap:10px;color:var(--text-muted);font-size:11px;margin:4px 0}.auth-divider:after,.auth-divider:before{content:"";flex:1 1;height:1px;background:var(--border)}.auth-demo-btn{width:100%;padding:11px;background:var(--bg-hover);border:1px solid var(--border);border-radius:10px;font-size:13px;color:var(--text-secondary);cursor:pointer;font-family:inherit;transition:background .15s,border-color .15s}.auth-demo-btn:hover{background:var(--bg-card-hover,var(--bg-surface));border-color:var(--accent);color:var(--text-primary)}.auth-error{background:rgba(239,68,68,.12);border:1px solid rgba(239,68,68,.4);border-radius:8px;padding:10px 14px;font-size:12px;color:var(--sell)}.auth-footer{text-align:center;margin-top:20px;font-size:13px;color:var(--text-muted)}.auth-footer a{color:var(--accent);text-decoration:none;font-weight:600}.auth-footer a:hover{text-decoration:underline}.challenge-tiers{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:8px;gap:8px}.tier-card{padding:10px 8px;background:var(--bg-hover);border:2px solid var(--border);border-radius:10px;cursor:pointer;text-align:center;transition:border-color .15s,background .15s}.tier-card.selected{border-color:var(--accent);background:rgba(100,130,255,.08)}.tier-name{font-size:12px;font-weight:700;color:var(--text-primary)}.tier-size{font-size:11px;color:var(--accent);font-weight:600;margin:2px 0}.tier-fee{font-size:10px;color:var(--text-muted)}