:root{--navy:#173570;--brand:#1f55ba;--accent:#f4bd3d;--paper:#f4f7fc;--surface:#fff;--ink:#172b50;--muted:#6c7890;--line:#d8e2f0;--danger:#bd4650;--success:#16866f}*{box-sizing:border-box}body{margin:0;min-width:320px;color:var(--ink);background:var(--paper);font:14px/1.6 "Microsoft YaHei","PingFang SC",sans-serif}.register-shell{min-height:100vh;display:grid;grid-template-columns:minmax(350px,.78fr) minmax(620px,1.22fr)}.intro{position:relative;overflow:hidden;padding:clamp(90px,10vw,150px) clamp(38px,7vw,100px) 64px;color:#fff;background:linear-gradient(145deg,#143066,#245ac0)}.intro:after{content:"";position:absolute;width:410px;height:410px;right:-245px;bottom:-190px;border:1px solid rgba(255,255,255,.16);border-radius:50%;box-shadow:0 0 0 65px rgba(255,255,255,.035),0 0 0 130px rgba(255,255,255,.025)}.pcube-lockup{position:absolute;top:34px;left:clamp(38px,7vw,100px);display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.08em}.pcube-logo{width:42px;height:42px;object-fit:contain}.kicker{color:#f6d879;font:700 11px/1 Consolas,monospace;letter-spacing:.17em}.intro h1{margin:18px 0 22px;font:600 clamp(40px,4.4vw,65px)/1.12 "STSong","SimSun",serif}.intro-copy{max-width:450px;color:#cad8f1;font-size:16px;line-height:1.9}.steps{display:grid;gap:16px;margin-top:38px}.step{display:grid;grid-template-columns:28px 1fr;gap:12px;align-items:center;color:#dbe7fb}.step span{width:28px;height:28px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.3);border-radius:50%;font:700 11px Consolas,monospace}.step strong{display:block;color:#fff}.step small{color:#aebfdd}.form-side{padding:54px clamp(30px,6vw,86px);display:flex;align-items:center}.form-card{width:min(780px,100%);margin:auto}.form-head{display:flex;justify-content:space-between;gap:24px;align-items:flex-end;margin-bottom:27px}.form-head h2{margin:0;font:600 32px/1.25 "STSong","SimSun",serif}.form-head p{margin:8px 0 0;color:var(--muted)}.login-link{flex:0 0 auto;color:var(--brand);text-decoration:none;font-weight:700}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px 20px}.field{display:grid;gap:7px}.field.full{grid-column:1/-1}.field label{font-size:12px;font-weight:700}.required{color:var(--danger)}.input-wrap{position:relative}.input{width:100%;height:46px;padding:0 13px;color:var(--ink);background:#fff;border:1px solid #cbd7e7;border-radius:8px;outline:0;transition:.18s}.input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(31,85,186,.12)}.input[aria-invalid="true"]{border-color:var(--danger);box-shadow:0 0 0 3px rgba(189,70,80,.09)}.field-error{min-height:18px;color:var(--danger);font-size:11px}.password-toggle{position:absolute;right:7px;top:7px;height:32px;padding:0 8px;border:0;color:var(--muted);background:transparent;cursor:pointer}.strength{height:3px;margin-top:7px;overflow:hidden;background:#e5ebf3;border-radius:4px}.strength i{display:block;width:0;height:100%;background:var(--danger);transition:.2s}.agreement{display:flex;gap:9px;align-items:flex-start;margin:4px 0;color:var(--muted);font-size:12px}.agreement input{margin-top:4px;accent-color:var(--brand)}.agreement a{color:var(--brand)}.submit{height:48px;border:0;border-radius:8px;color:#fff;background:linear-gradient(135deg,var(--brand),#2d6bd2);box-shadow:0 9px 20px rgba(31,85,186,.2);font-weight:800;cursor:pointer;transition:.18s}.submit:hover{transform:translateY(-1px);box-shadow:0 12px 24px rgba(31,85,186,.25)}.submit:disabled{cursor:not-allowed;opacity:.65;transform:none}.form-message{min-height:22px;margin:11px 0 0;color:var(--danger);font-size:12px}.form-message.success{color:var(--success)}.participant{--brand:#d87922}.participant .intro{background:linear-gradient(145deg,#173570,#2855a1)}.participant .kicker{color:#f2bf89}.participant .submit{background:linear-gradient(135deg,#dc7b24,#ee9b3e);box-shadow:0 9px 20px rgba(216,121,34,.22)}.participant .input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(216,121,34,.12)}@media(max-width:980px){.register-shell{grid-template-columns:1fr}.intro{min-height:380px;padding:100px 9vw 50px}.steps{grid-template-columns:repeat(3,1fr)}.form-side{padding:46px 8vw 70px}}@media(max-width:650px){.intro{min-height:330px}.intro h1{font-size:40px}.steps{display:none}.form-side{padding:36px 18px 55px}.form-head{align-items:flex-start;flex-direction:column;gap:10px}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}}