:root{--primary-gradient:linear-gradient(135deg, #667eea 0%, #764ba2 100%);--card-shadow:0 10px 40px rgba(0,0,0,0.1)}body{background:linear-gradient(135deg,#667eea 0,#764ba2 100%);min-height:100vh;display:flex;align-items:center;justify-content:center;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}.auth-container{width:100%;max-width:420px;padding:20px}.auth-card{background:#fff;border-radius:20px;box-shadow:var(--card-shadow);padding:40px;position:relative;overflow:hidden}.auth-card::before{content:"";position:absolute;top:0;left:0;right:0;height:5px}.auth-header{text-align:center;margin-bottom:35px}.auth-card::before,.auth-icon{background:var(--primary-gradient)}.auth-icon{width:70px;height:70px;border-radius:15px;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;box-shadow:0 5px 20px rgba(102,126,234,.4)}.auth-icon i{font-size:35px;color:#fff}.auth-title{font-size:28px;font-weight:700;color:#1a1a1a;margin-bottom:8px}.auth-subtitle{color:#666;font-size:15px;margin:0}.form-label{font-weight:600;color:#333;margin-bottom:8px;font-size:14px}.form-control{border:2px solid #e0e0e0;border-radius:10px;padding:12px 16px;font-size:15px;transition:all .3s}.form-control:focus{border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,.1)}.input-group-text{border:2px solid #e0e0e0;border-right:none;background:0 0;border-radius:10px 0 0 10px}.input-group .form-control{border-left:none;border-radius:0 10px 10px 0}.input-group:focus-within .input-group-text{border-color:#667eea}.btn-primary{background:var(--primary-gradient);border:0;border-radius:10px;padding:14px;font-size:16px;font-weight:600;transition:transform .2s,box-shadow .2s}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(102,126,234,.4)}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.alert{border-radius:10px;border:0;padding:12px 16px}.alert-danger{background-color:#fee;color:#c33}.alert-success{background-color:#efe;color:#3c3}.auth-footer{text-align:center;margin-top:25px;padding-top:25px;border-top:1px solid #e0e0e0}.auth-footer a{color:#667eea;text-decoration:none;font-weight:600;transition:color .2s}.auth-footer a:hover{color:#764ba2}.floating-shapes{position:fixed;width:100%;height:100%;top:0;left:0;z-index:0;pointer-events:none}.shape{position:absolute;background:rgba(255,255,255,.1);border-radius:50%}.shape-1{width:300px;height:300px;top:-100px;left:-100px}.shape-2{width:200px;height:200px;bottom:-50px;right:-50px}.shape-3{width:150px;height:150px;top:50%;right:10%}.password-strength{height:4px;border-radius:2px;background:#e0e0e0;margin-top:8px;overflow:hidden}.password-strength-bar{height:100%;transition:width .3s,background-color .3s;width:0}.password-strength-bar.weak{background:#f44;width:33%}.password-strength-bar.medium{background:#fa0;width:66%}.password-strength-bar.strong{background:#00c851;width:100%}.password-strength-text{font-size:12px;margin-top:4px}