:root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --success-color: #10b981;
            --error-color: #ef4444;
            --text-primary: #1f2937;
            --text-secondary: #6b7280;
            --border-color: #e5e7eb;
            --bg-light: #f9fafb;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--primary-gradient);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            font-size: 14px;
        }

        .container {
            background: white;
            border-radius: 16px;
            box-shadow: var(--shadow-xl);
            padding: 0;
            max-width: 480px;
            width: 100%;
            overflow: hidden;
            animation: slideUp 0.6s ease-out;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .header {
            background: var(--primary-gradient);
            padding: 40px 30px;
            text-align: center;
            color: white;
        }

        .header .icon {
            width: 64px;
            height: 64px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            backdrop-filter: blur(10px);
        }

        .header .icon i {
            font-size: 28px;
        }

        .header h1 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.025em;
        }

        .header p {
            font-size: 16px;
            opacity: 0.9;
            line-height: 1.5;
            max-width: 320px;
            margin: 0 auto;
        }

        .content {
            padding: 40px 30px;
        }

        .alert {
            padding: 16px 20px;
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 14px;
            line-height: 1.5;
            animation: slideIn 0.4s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(-20px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .alert-success {
            background: #ecfdf5;
            color: #047857;
            border: 1px solid #a7f3d0;
        }

        .alert-error {
            background: #fef2f2;
            color: #dc2626;
            border: 1px solid #fecaca;
        }

        .alert i {
            font-size: 16px;
            margin-top: 1px;
            flex-shrink: 0;
        }

        .form-group {
            margin-bottom: 24px;
        }

        .form-label {
            display: block;
            margin-bottom: 8px;
            color: var(--text-primary);
            font-weight: 500;
            font-size: 14px;
        }

        .form-input {
            width: 100%;
            padding: 16px;
            border: 2px solid var(--border-color);
            border-radius: 12px;
            font-size: 16px;
            font-family: inherit;
            transition: all 0.2s ease;
            background: #fafafa;
        }

        .form-input:focus {
            outline: none;
            border-color: #667eea;
            background: white;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .form-input:invalid {
            border-color: var(--error-color);
        }

        .btn {
            width: 100%;
            padding: 16px;
            background: var(--primary-gradient);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-family: inherit;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .success-message {
            text-align: center;
            padding: 20px 0;
        }

        .success-message .icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #10b981, #059669);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 24px;
            color: white;
            font-size: 36px;
        }

        .success-message h2 {
            color: var(--text-primary);
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .success-message p {
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 24px;
        }

        .back-link {
            text-align: center;
            margin-top: 24px;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
        }

        .back-link a {
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.2s ease;
        }

        .back-link a:hover {
            color: #5a67d8;
            transform: translateX(-2px);
        }

        .security-notice {
            background: #f0f9ff;
            border: 1px solid #bae6fd;
            border-radius: 8px;
            padding: 12px 16px;
            margin-top: 16px;
            font-size: 13px;
            color: #0369a1;
        }

        .security-notice i {
            margin-right: 6px;
        }

        @media (max-width: 520px) {
            .container {
                margin: 10px;
                max-width: none;
            }
            
            .header {
                padding: 30px 20px;
            }
            
            .content {
                padding: 30px 20px;
            }
            
            .header h1 {
                font-size: 24px;
            }
        }

        /* Loading state */
        .btn.loading {
            pointer-events: none;
        }

        .btn.loading i {
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }