*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji";-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,#1a1a2e 0,#16213e 50%,#0f3460 100%);background-attachment:fixed;position:relative;overflow:hidden}body::after,body::before{content:"";position:absolute;border-radius:50%;filter:blur(90px);opacity:.35;pointer-events:none}body::before{width:420px;height:420px;background:#4361ee;top:-120px;left:-80px}body::after{width:380px;height:380px;background:#e94560;bottom:-140px;right:-60px}.register-wrap{width:100%;max-width:440px;position:relative;z-index:1}.register-card{background:rgba(255,255,255,.97);border-radius:18px;padding:40px 36px 32px;box-shadow:0 24px 60px rgba(0,0,0,.45),0 2px 8px rgba(0,0,0,.2);backdrop-filter:blur(6px)}.brand{text-align:center;margin-bottom:28px}.brand .logo{display:block;width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,#4361ee 0,#7209b7 100%);overflow:hidden;margin-bottom:14px;box-shadow:0 8px 20px rgba(67,97,238,.45)}.brand .logo img{display:block;width:100%;height:100%;object-fit:cover}.brand h1{font-size:22px;color:#1a1a2e;font-weight:700;margin-bottom:6px}.brand p{font-size:13px;color:#8a8f99}.form-group{margin-bottom:18px}.form-group label{display:block;font-size:13px;font-weight:600;color:#3d4350;margin-bottom:7px}.input-box{position:relative}.input-box .icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:#b3b8c2;font-size:15px;pointer-events:none;line-height:1}.form-control{width:100%;height:46px;padding:0 14px 0 40px;border:1.5px solid #e2e5ec;border-radius:10px;font-size:14px;color:#1a1a2e;background:#fff;transition:border-color .2s,box-shadow .2s;outline:0}.form-control::placeholder{color:#b8bdc7}.form-control:focus{border-color:#4361ee;box-shadow:0 0 0 3px rgba(67,97,238,.13)}.form-control.error{border-color:#e94560;box-shadow:0 0 0 3px rgba(233,69,96,.12)}.form-control.invite{letter-spacing:1px;font-weight:600;padding-right:44px}.invite-hint{display:flex;align-items:center;gap:5px;margin-top:7px;font-size:12px;color:#e94560;font-weight:500}.invite-hint::before{content:"🔒";font-size:11px}.field-error{display:none;margin-top:6px;font-size:12px;color:#e94560}.field-error.show{display:block}.password-strength{margin-top:8px;height:4px;border-radius:2px;background:#eceef2;overflow:hidden}.password-strength span{display:block;height:100%;width:0;border-radius:2px;transition:width .3s,background .3s}.btn-register{width:100%;height:48px;margin-top:8px;border:none;border-radius:10px;background:linear-gradient(135deg,#4361ee 0,#7209b7 100%);color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:transform .12s,box-shadow .2s,opacity .2s;box-shadow:0 8px 18px rgba(67,97,238,.35);display:flex;align-items:center;justify-content:center;gap:8px}.btn-register:hover{transform:translateY(-1px);box-shadow:0 12px 24px rgba(67,97,238,.45)}.btn-register:active{transform:translateY(0)}.btn-register:disabled{opacity:.7;cursor:not-allowed;transform:none}.btn-register .spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:.7s linear infinite spin;display:none}@keyframes spin{to{transform:rotate(360deg)}}.form-footer{margin-top:22px;text-align:center;font-size:13px;color:#8a8f99}.form-footer a{color:#4361ee;text-decoration:none;font-weight:500}.form-footer a:hover{text-decoration:underline}.agreement{margin:6px 0 4px;display:flex;align-items:flex-start;gap:8px;font-size:12px;color:#8a8f99;line-height:1.5}.agreement input{margin-top:2px;accent-color:#4361ee;cursor:pointer}.agreement a{color:#4361ee;text-decoration:none}.toast{position:fixed;top:24px;left:50%;transform:translateX(-50%) translateY(-200%);opacity:0;visibility:hidden;pointer-events:none;background:#fff;color:#1a1a2e;padding:14px 22px;border-radius:10px;box-shadow:0 10px 30px rgba(0,0,0,.25);font-size:14px;font-weight:500;display:flex;align-items:center;gap:10px;z-index:9999;transition:transform .35s cubic-bezier(.16, 1, .3, 1),opacity .35s cubic-bezier(.16, 1, .3, 1),visibility .35s;max-width:90%}.toast.show{transform:translateX(-50%) translateY(0);opacity:1;visibility:visible;pointer-events:auto}.toast.error{border-left:4px solid #e94560}.toast.info{border-left:4px solid #4361ee}.toast .toast-icon{font-size:16px}@media (max-width:480px){.register-card{padding:32px 22px 24px}.brand h1{font-size:20px}}